rock drill

D 20100 -- 2 es 0101 / TMK

INSTRUCCIONES PARA ELEVAR MARTILLOS HIDRÁULICOS1 (1)

2001 SANDVIK TAMROCK CORP., Tampere PlantP.O.Box 100FIN--33311 TAMPERE, FinlandTel. +358 205 44 121Telefax +358 205 44 120

E

HE 122 / HE 11939 kg

HE 30089 kg

HL 30094 kg

HL 300 S92 kg

HL 500/ HL 500S/ HL500G/HL550super/ HL 500F : 130 kg

HL 1000/ HL 1000 S290 kg rod, 300 kgversión de tubo

HL 600 / HL 600 S180 kg

HL 1500/ HL 1500 S 450 kg

HL 700 245 kg

B 23700 – 2 en 0602 / JS

HYDRAULIC ROCK DRILL HLX5TOperation and maintenance

1 (16)

2002 SANDVIK TAMROCK CORP., Tampere PlantP.O.Box 100FIN–33311 TAMPERE, FinlandTel. +358 205 44 121Telefax +358 205 44 120

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CONTENTS

1. GENERAL 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. TAKING A NEW ROCK DRILL IN USE 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1. Preparations 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2. Test run 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. HOSE CONNECTIONS 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. LUBRICATION SYSTEM 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. REMOVING FRONT END WITH ROCK DRILL ON FEED RAIL 6. . . . . . . . . . . . 5.1. Replacing the flushing housing seals 7. . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2. Changing the bearings of the flushing housing 8. . . . . . . . . . . . . . . . . . 5.3. Coupling 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.4. Rotation sleeve 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5. Chuck bearing 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6. Chuck 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7. Rotation bushing bearings 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.8. Wear limits of the shank 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. CHECKING AND TIGHTENING BOLTS AND TIE RODS 10. . . . . . . . . . . . . . . . . . 6.1. Tie rod tightening 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2. Pressure accumulator and stabilator bolts 11. . . . . . . . . . . . . . . . . . . . . . 6.3. Flushing house bolts 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7. PERIODIC MAINTENANCE 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1. General 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2. Maintenance tools and parts 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3. Every day 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4. Every week 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5. Basic maintenance 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6. After rock drill service 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.7. Service card 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.8. Service follow–up 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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1. GENERAL

These instructions describe in brief the main maintenance procedures for HLX5 serieshydraulic rock drills.

Service is always ready to help and give advice in all maintenance problems. The qualifiedTAMROCK maintenance personnel of your TAMROCK dealer and original TAMROCKspare parts ensure reliable operation of your drilling equipment.

2. TAKING A NEW ROCK DRILL IN USE

2.1. PreparationsNew rock drills are delivered with the pressure accumulatorsnot pressurized and the hose connections plugged.

Pressurize the accumulators according to the instructions. See “Pressure accumulator,Repair instructions”.

Before a new rock drill is installed the drilling equipment hydraulic system must bechecked and flushed thoroughly.

2.2. Test run

Test run the rock drill and make sure that it operates properly before starting productiondrilling.

During test run observe:– shank lubrication– flushing– pressures and temperatures– possible oil leakages

Avoid use of full percussion power if the steel is not againstthe rock. This will reduce the breakage of the accumulator’sdiaphragm, the wear of flushing housing, drilling tools and thecavitation of the percussion mechanism. This type of ”idling

drilling” is the most critical while drilling upwards or cleaningthe holes with pumping motion.

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3. HOSE CONNECTIONS

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Fig 1. Hose connections

1. Stabilator 5. Rotation, pressure (H.P.)

2. Shank lubrication 6. Rotation, return (L.P.)

3. Percussion mechanism pressure side(H.P.)

7. Flushing

4. Percussion mechanism return side(L.P.)

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4. LUBRICATION SYSTEM

The rock drill percussion mechanism and the rotation motor are lubricated by the hydraulicoil flowing through them.

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Fig 2. Lubrication scheme

The rotation mechanism and the shank have oil mist lubrication. The lubrication line fromthe central oiler is connected to end of the rock drill. From there the oil mist is ductedthrough piston rear end to the front end of the rock drill where the flow will lubricate therotation mechanism, coupling and the bushing of the flushing housing.

Leakage oil from the rear seals of piston is also ducted to the front end of the rock drillthrough hole.

The oil that has circulated through the rock drill lubrication system is removed through theshank lubrication collector or can be led via return channels and spacer to the feed rail.

Never connect the used oil mist to the hydraulic system returnline.

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Air

1

2

4

3

Fig 3. Shank lubrication

1. Rock drill 3. Drain valve

2. SLU 1/2/3 4. Filler cap

1. The shank lubrication oil consumption can be adjusted. **2. If the oil level in the oiler does not lower during drilling. **3. Drain regularly the water that has collected in the oiler. The draining interval

depends on the local conditions.4. Only the oils mentioned in the oil recommendation are allowed.5. Refill the oiler regularly.

** See the instruction manual for SLU 1/2/3

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5. REMOVING FRONT END WITH ROCK DRILL ON FEED RAIL

When you remove the flushing housing and shank, turn therock drill to a horizontal position. The rotation bushing and the

coupling can fall out and cause injury.

If the shank lubrication is clogged (no air comes from theshank lubrication return hose), stop the compressor. Beforeopening the flushing housing bolts, carefully open the lockingscrew and let the air pressure out. Otherwise the air pressurecan blow / burst out the flushing housing and cause injury.

The flushing housing can be removed when the rock drill is in the feed rail. Throughopening the bolts (4), the flushing housing (1), shank (2), and coupling (3) can be removedwithout removing the rock drill from the feed rail. The rotation sleeve (6) can be pulled outby opening the screw (5). The screw (5) prevents the rotation sleeve from dropping, forexample, when the shank is changed. Check the condition of the stabilizer pins.

1 4

3

2

5

6

Fig 4. Removing the flushing housing

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5.1. Replacing the flushing housing seals

Flushing housing seals must be replaced when the flushing air or water escapes from thesides of the seal housing, and they should be checked whenever the shank is changed.Seals are easier to install when they are lubricated. Install the new flushing housing sealsmaking sure they face the right direction (shown in the figure). The use of a spare flushinghousing is recommended, as it speeds up on–site maintenance of the rock drill.

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Fig 5. The flushing housing seals must be installed facing the right direction, determinedby the flushing mode

In addition, a damaged seal plate (1) must be replaced due to risk ofcorrosion.

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5.2. Changing the bearings of the flushing housing

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ÇÇÇThe bearings must be changed if the wear indication–groove hasworn out from any area (as shown in the picture).

5.3. Coupling

Pull the coupling out from the rotation bushing. Check and re-place, if the edges of the inner teeth are worn sharp.

5.4. Rotation sleeve

AThe rotation sleeve must be replaced when the collar A is worndown to the level of the surface or the surface is damaged. Checkalso that the sliding surfaces of the rotation sleeve’s outer ring arein appropriate condition.

5.5. Chuck bearing

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ÇÇÇCheck the chuck bearing inside the rotation sleeve. The bearingmust be replaced when the bearing surface is worn to the level ofthe wear indicator groove at any point.

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5.6. Chuck

1 mm C The chuck inside the rotation sleeve must be replaced every 500percussion hours; it has worn over 1 mm from its original level,the surface against the stabilizer is worn to the level of the wearindicator groove C; or the chuck has cracks in it.

5.7. Rotation bushing bearings

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ÇÇÇThe bearings must be changed if the lubrication groove has wornout from any area (as shown in the picture).

5.8. Wear limits of the shank

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Manufacturing 2 mmReject 1mm

The shank must be changed if the 1 mm bevel of the strikinghead or 1 mm of the splines is worn out or any other wear limit isexceeded.

When installing a new shank, take care that no dirt entersinside the rock drill with the shank. Insert the shank carefullythrough the flushing housing, so that the flushing device sealsare not damaged.��

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6. CHECKING AND TIGHTENING BOLTS AND TIE RODS

Perhaps the most important maintenance task is to check the tightness of the bolts,particularly the tie rods and mounting bolts. Loose tie rods cause rapid wear of thebody section faces, shortening the service life of the rock drill.

If the threads are not clean the bolts cannot be tightened correctly. In such cases the boltmust be removed, and the threads checked, cleaned, and lubricated with Vaseline.

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1. Check the tightness each bolt by using 10 % higher torque than specified.2. The joint being tested is loose if the wrench turns. In this case loosen all the

bolts being tested and retighten in the correct order.3. If the threads are dirty, clean the threads, check them, and lubricate with

grease.

Use only an inspected, high–quality torque wrench.

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Fig 6. Rock drill bolts

1. Tie rod bolts2. Pressure accumulator bolts3. Flushing housing bolts

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6.1. Tie rod tightening

The tools required:– torque wrench– 24 mm socket1. Lubricate the threads and the nut faces with Vaseline.2. Pretighten to 200 Nm (20 kpm). Correct tightening order is 1–2–3–4–5–6–7–8.3. Final tightening torque is 400 Nm (40 kpm). Same tightening order

(1–2–3–4–5–6–7–8) should be used.

1

23

4

5 6

7 8

Fig 7. Tie rods; tightening order

6.2. Pressure accumulators

The tools required:– torque wrench– 24 mm socket1. Lubricate the bolt threads with Vaseline.2. Pretighten all four bolts to 100 Nm (10 kpm). Correct tightening order is 1–2–3–4.3. Final tightening torque is 200 Nm (20 kpm). Same tightening order (1–2–3–4)

should be used.4. Pretighten the bolts 5,6 and 7 to 100 Nm (10 kpm) and finally tighten to 200 Nm

(20 kpm). No tightening order required.

1

2

3

4

56

7

Fig 8. Pressure accumulator bolts tightening order

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6.3. Flushing housing bolts

The tools required:– torque wrench– 24 mm socket1. Lubricate the bolt (1, 2, 3, 4) threads with Vaseline.2. Pretighten all four bolts to 200 Nm (20 kpm). Correct tightening order is 1–2–3–4.3. Final tightening torque is 400 Nm (40 kpm). Same tightening order (1–2–3–4)

should be used.

1

4

2

3

Fig 9. Flushing housing bolts

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7. PERIODIC MAINTENANCE

7.1. General

The idea of periodic maintenance is that the rock drill is serviced before any breakdownoccurs. This way expensive additional damages and unwanted stops can be avoided.

The maintenance interval is 500 percussion hours, but depends on the local conditions,and it must therefore be determined according to this experience.

Searching for the correct maintenance interval, it is advisable to start the periodicmaintenance as specified, and then lengthen the intervals until a period that suits the localconditions has been found.

In addition the rock drill should always be taken in for service when the operator reportsof a fault that can cause major damage or a production stop.

7.2. Maintenance tools and parts

Tools required for maintenance:1. Torque wrench2. Socket, 24 mm3. Ring spanner head, 24 mm4. Spanner, 19 mm5. Extension6. Check gauge for low–pressure accumulator7. Check gauge for high–pressure accumulator

1

23

4

56

7

Fig 10. Maintenance tools

Other rock drill parts which are to be available at the rig for maintenance are flushinghousing gasket, flushing seals and shank adapter.

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7.3. Every day1. Check flushing housing bolt tightness.2. Check for possible oil leaks.3. Check hoses and connections.

7.4. Every week1. Check hour meter reading.2. Check accumulator filling valves and their protective caps and the accumulator

bolt tightness.3. Check accumulator pressures.– Low pressure accumulator 50 bar– High pressure accumulator 8 bar– Stabilator accumular 4 bar4. Check condition of shank, chuck, flushing housing, coupling, shank bushing and

rotation bushing.5. Check tie rod tightness. If loose, tighten them.

7.5. Basic maintenance

Rock drill basic maintenance is recommended every 500 operating hours, Cf. “RepairInstructions’’. This maintenance interval can be adjusted according to local conditions andexperiences which are accumulated to the rock drill maintenance history. Do planned andpreventive maintenance rather than repairs after damages.

Monitor percussion hour meter reading and / or drilled meters / shifts between eachmaintenance. Fill in the service card of the rock drill.

7.6. After rock drill service

After rock drill service the reassembled parts will settle down to their proper position duringdrilling under normal drilling loads. Especially when parts have worn surfaces it may resultthat the tie rods and the mounting bolts do not keep their tightness. Therefore are–tightening of these bolts is required after each rock drill service or if the rockdrill has been off the feed rail.

After rock drill service and 1 round / 100–300 meters drilling:1. Re–tighten the rock drill mounting bolts on the feed rail.2. Re–tighten the rock drill tie rods and flushing device bolts.

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7.7. Service card

Each rock drill has its own service cards. When a rock drill is taken up for maintenance,all the earlier cards should be at hand. All relevant information about the maintenancemust be written down on the card. When the rock drill is again taken into use, the nextmaintenance date should be written down on the card. Benefits of the card:

– Wear of every specific component of each rock drill is clearly displayed, and bycomparing the cards the effect of different circumstances and measures can bedetermined.

– The cards help in determining maintenance required to prevent major damage.– Properly filled cards show the complete maintenance history of the rock drill.– The cards help to determine the point when the rock drill should be scrapped.– Use service card presented on the next page.

7.8. Service follow–up

In order to follow the maintenance of a rock drill, a maintenance card presented next pagecan be used.

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D 23700 – 2 en 0602 / JS

HYDRAULIC ROCK DRILL HLX5TRepair instructions

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CONTENTS

1. DISASSEMBLY 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1. Flushing housing 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2. Replacing seals of flushing housing 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3. Replacing bearings on flushing housing 5. . . . . . . . . . . . . . . . . . . . . . . . 1.4. Replacing bearing inside rotation bushing 7. . . . . . . . . . . . . . . . . . . . . . 1.5. Pressure accumulators and rear cover 8. . . . . . . . . . . . . . . . . . . . . . . . . . 1.6. Gear housing, primary gear and stabilizer accumulator 9. . . . . . . . . . 1.7. Removing spacer 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8. Percussion cartridge 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.9. Hydraulic motor 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.10.Stabilizer spacer 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. WEAR LIMITS 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. ASSEMBLY 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1. Percussion cartridge 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2. Rotation motor 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3. Assembling and centralizing the stabilizer piston seal 28. . . . . . . . . . . 3.4. Stabilizer spacer 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5. Installing bearings of gear housing 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6. Installing chuck, rotation bushing and stabilizer accumulator 34. . . . 3.7. Installing of flushing housing 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8. Pressure accumulators, hose connector flanges, rear cover 36. . . . . .

4. TEST RUN 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. SPECIAL TOOLS 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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1. DISASSEMBLY

1.1. Flushing housing

The flushing housing (1), the shank (2), and the coupling (3) can be pulled out withoutremoving the rock drill from the feed rail, just open the bolts (4). When the Allen screw (5)is opened, the rotation bushing (6) and the chuck (7) can also be pulled out. The Allenscrew (5) prevents the rotation bushing from accidentally falling out when, for instance,the shank is being replaced.

1 4

3

2

5

67

Fig 1. Flushing housing disassembly

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1.2. Replacing seals of flushing housingThe flushing housing seals must be replaced if flushing air or water is leaking out past theseal housing, and checked whenever the shank is being replaced. Lubricate the seals withgrease before installation. Install the new seals in the right direction, as illustrated. Werecommend that a pre–assembled spare flushing housing is used, it saves time in rockdrill maintenance at the drilling site.

AIR FLUSHING

WATER FLUSHING

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Fig 2. The flushing housing seals must be installed the correct way according the typeof flushing

Due to risk of corrosion, also replace the gasket (1) if it is damaged.

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1.3. Replacing bearings on flushing housing

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The bearings must be replaced if the indicator groove is wornaway from any place. (Fig. 3)

Fig 3. Flushing housing bearings

Make sure that the lubrication channels are flushed clean with pressuredair.

Detach the front cover (Fig. 4) and press the bearings out (Fig. 5, 6, 7) using a hydraulicpress and the punches in the tool kit in the direction indicated by the arrows in theillustration.

Fig 4. Detaching the front cover

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Fig 5. Pressing the shank bushing out by using the special tools no. 5 and 7 (See”Special tools”)

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Fig 6. Pressing the front bearing out of front cover by using the special tool no. 2 and9(See ”Special tools”)

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Fig 7. Pressing the rear bearing out of the shank bushing by using the special tool no.2 and 9 (See ”Special tools”)

Pull the coupling out from the rotation bushing. Check and re-place, if the edges of the inner teeth are worn sharp or visiblecracks are seen.

Fig 8. Coupling

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1.4. Replacing bearing inside rotation bushing

The rotation bushing must be replaced if the shoulder A (Fig. 9) is worn down to end facelevel or damages are observed. Check chuck bearing inside rotation bushing. Bearing Bhas to be replaced if the indicator groove is worn away from any place as illustrated. Usespecial tool no. 4 and 9 for this purpose. (See ”Special tools”)

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Fig 9. Rotation bushing, chuck bearing

The chuck inside the rotation bushing must be replaced after 500 percussion hours or ifshank end has worn more than 1 mm from original surface, shoulder on stabilizer end hasworn down to end face level C (Fig. 10) or it has hair cracks.

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1 mm

Fig 10. Wearing surfaces

1.5. Pressure accumulators and rear coverRelease the accumulator pressure by opening the filling valve before removing thepressure accumulators (1) from the rock drill.

Never remove a pressured accumulator.

Open the accumulator fastening bolts (2). Remove the accumulators. Remove the O–ringand the gasket. Put protective plugs into the openings on the rock drill body. Open the rearcover’s fastening bolts (4). Detach the rear cover (3) from the rock drill.

On disassembly, inspection, re–assembly, and filling of pressure accumulator, see”Pressure accumulators, repair instructions“.

2

1

3

4

Fig 11. Disassembly of pressure accumulators and rear cover

WARNING!

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1.6. Gear housing, primary gear and stabilizer accumulator

Mount the rock drill (1) to the repair stand (2, See ”Special tools”, item 16). Repair standand lifting eye bolts (3, See ”Special tools”, item 17) are included in special tool set. Fastenbolts (4) on both side of rock drill firmly. Disassemble the stabilizer accumulator (5).Remove the front (6) and rear (7) brackets of the feed wires.

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3

4

5

4

6

7

Fig 12. Mounting rock drill to repair stand and disassembling stabilizer accumulator

10 (42) D 23700 – 2 en 0602 / JS



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Open the cap nuts (1) of the tie rods (6 pcs). Remove the gear housing (2). If gear housinghas stuck together with spacer, they can be detached by unfastening the lower most tierods with a 19 mm spanner. Remove simultaneously primary gear (3) and slide washers(4). Check gear and washers. Replace if they are worn down, seized up or have haircracks.

43

2

1

1

1

Fig 13. Disassembling of gear housing and primary gear

Remove the gear housing side bolts (4 pcs). Clean the bores carefully through the sidebolt holes.

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Check the gear housing front bearing and rear bearing for wear. Bearings must bereplaced if the bearing surface is worn down at any point of the indicator grooves (1). Ifthe gear housing bearings are worn or damaged, remove them using a hydraulic pressand punches (Fig. 14, 15 and 16).

1

ÎÎÎÎÎÎ

ÎÎÎÎ

Fig 14. Disassembly of gear housing bushings

12 (42) D 23700 – 2 en 0602 / JS



�

ÍÍÍÍ

ÍÍÍÍ

13

7

Fig 15. Pressing the front bearing out by using the special tools no. 7 and 13 (See ”Specialtools”)

ÍÍÍÍÍÍÍÍÍÍÍÍ

ÍÍ

ÍÍÍÍÍÍÍÍÍÍÍÍ

7

12

Fig 16. Disassembly of rear bearing with steel frame with special tools no. 7 and 12 (See”Special tools”)

D 23700 – 2 en 0602 / JS


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Remove rotation shaft front bearing assembly from gear housing. Replace the needlebearing every 500 operating hours. Use grease (3) and the special tool no. 10 (See”Special tools”) as illustrated. Blows with the hammer make the grease drive the bearingout. (Fig. 17).

31

2

10

Fig 17. Removal of front bearing

1.7. Removing spacer

Mark the front ends of the stabilizer pins with a permanent marker and pull loosen pins(1) apart from pin housing. Turn rock drill to horizontal position. Secure the spacer withlifting eye bolts (6, See ”Special tools”, item 18). Release nuts (2) of middlemost tie rods(3). Detach spacer (4) from body cylinder (5). (Fig. 18)

1

4

5

2

3

6

Fig 18. Removal of spacer

14 (42) D 23700 – 2 en 0602 / JS



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If body cylinder (1) is stucked together with the spacer (2), they can be detached byunfastening middlemost tie rods (3) using a 19 mm spanner (Fig. 19).

32 1

Fig 19. Detaching the body cylinder from the spacer

Detach hose jointing flanges (1) from body cylinder.

1

Fig 20. Disassemble hose jointing flanges

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1.8. Percussion cartridge

Pull front bearing (1) and piston (2) out from body cylinder (3). Check the piston, andreplace it if:

– The chamfer (A) has worn off.– The piston has cracks or seizure marks. The piston may be polished with a cloth

pad disc. No grinding is allowed!

Check the bearing bushing (4) of the front bearing. If it is damaged (=has scratches,seizure marks or hot spots), replace the front bearing. Front bearing is recommended tobe replaced latest after 2000 percussion hours usage. (Fig. 21)

1

2

4

3A

Fig 21. Removing the piston

Place special tool (8) inside rear bearing (2), and push rear bearing out together with pilotcylinder (3) and distributor (4). (Fig. 22)

ÍÍ

8

23 4

Fig 22. Disassembling the rear bearing, pilot cylinder and distributor

16 (42) D 23700 – 2 en 0602 / JS



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Detach rear bearing (1) and distributor (2) from pilot cylinder (3). Check parts for cracks,seizure marks and other damages. Minor scratches can be polished with cloth pad disc,grinding is not allowed. Rear bearing is recommended to be replaced latest after 2000percussion hours usage. (Fig. 23)

12

3

Fig 23. Dismantling of rear bearing and distributor

Check the piston seal grooves (A) at the rear bearing. Maximum groove width is 4.35 mm.The width of the groove can be checked with gauge no. 14 (see page 40). Also check thegrooves visually; if the groove is too wide or damaged, replace the rear bearing.

14

A

Fig 24. Checking the piston seal grooves (A)

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1.9. Hydraulic motor

After every 500 operating hours, the condition of the hydraulic motor shall be checked,and the O–rings replaced. Open the rotation motor mounting screws (2), and pull themotor out. Check all parts carefully and replace damaged (scratched, seized, cracked)parts.

2

Fig 25. Disassembly of the hydraulic motor

If the O–rings are holding the balance plate (5) and the channel plate (6) tight, they canbe released by using grease (2) (Fig. 26), spacer pin (3) (Fig. 26) and a punch (10) (Fig.26).

ÍÍÍÍÍÍ

ÍÍÍÍÍÍ

ÍÍÍÍÍÍ

Í

Í

ÍÍ

ÍÍ

ÍÍÍÍ

ÍÍÍÍ


ÍÍÍÍ

ÍÍÍ

Í

ÄÄÄÄ

2310

ÍÍÍÍÍÍ

ÍÍÍÍÍÍ

56

Fig 26. Disassembly of the balance– and the channel plates

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1.10. Stabilizer spacerDetach rotation shaft (1) and bearing housing (2) from stabilizer spacer (3). Inside rotationshaft is a spacer pin (4) which drops down when shaft is turned to vertical position. Checkshaft for wear, particularly seal and bearing areas. Bearings and rotation shaft seal haveto be changed after every 500 operating hours.

23

1

4

67

Fig 27. Disassembling the stabilizer spacer

Extract pin housing (1). Rotate housing so that lower spigot (2) of pin housing does notfit in its hole. Put pin housing partly back on to stabilizer spacer spigot and carefully puffstabilizer pistons (3) out of their cylinders by compressed air through stabilizer oilchannels (Fig. 27, 6 and 7).

If the pistons do not come loose, fit the threaded holes (6 and 7) with grease nipples.Secure the pin housing (1) axially to the spacer (3). Apply grease inside the unit with agrease gun until the stabilizer pistons come loose. Clean the grease from the channels.

1

3

2

Fig 28. Extracting the pin housing

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Inspect grooves for percussion piston seals. Maximum width of the groove is 4.35 mm.If groove is worn too wide, or damaged, seal bushing has to be replaced, recommendedchange period is 500 percussion hours. Use special tool no. 14 (See ”Special tools”) forinspecting the groove. Check also the groove visually.

14

A

Fig 29. Special tool for checking the groove

The seal bushing can be removed by special tool (no. 3 and 7, See ”Special tools”) andpress.

ÍÍÍÍÍÍÍÍ

ÍÍÍÍÍÍÍÍ

37

Fig 30. Removal of seal bushing

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2. WEAR LIMITS

Make sure that the percussion cartridge goes into the body cylinder together with thespacer.

Take measurements C, D, E. Measurement “C > (D+E)” (Fig. 31), otherwise the bodycylinder must be discarded.

Fig 31. Wear limits

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Take measurements C, E, L, M. Measurement “L < (C–E+M)” (Fig. 32), otherwise the bodycylinder must be discarded.

Fig 32. Wear limits

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Part Wear limits

A

B

Shank bearings

Rotation bushing bearings

Replace bearings if wear indicator hasworn off at any point.

F Piston Replace if chamfer has worn off.

G Chuck The chuck inside the rotation bushingmust be replaced after 500 percussionhours or if shank end has worn more than1 mm from original surface, shoulder onstabilizer end has worn down to end facelevel or it has hair cracks.

H Shank bushing Replace if worn > 1mm or if wearingsurface is cracked.

I Rotation bushing Replace rotation bushing if wear shoulderhas worn down.

J Coupling piece Replace if teeth have worn pointed.

K Stabilizer piston Replace stabilizer piston if wear indicatorgroove has worn away or if there areseizures or hair cracks.

N Rotation bushing end float Replace gear housing if N < 0,5mm.

See Figure 33.

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�

H

JB

FI

G

B

K

N

I

J

A

1 mmG

ÎÎÎ

ÎÎÎÎÎÎ

A / B

F

H

1 mm

H

A

Fig 33. Wear limits

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3. ASSEMBLY

Before assembly:– Remove all old O–rings and seals.– Clean all parts thoroughly.– Lubricate parts liberally !– Mount body cylinder to repair stand.

3.1. Percussion cartridge

Liberally lubricate the piston rear seals and cautiously rub them softer with your fingers.An alternative is to soften the seals in warm oil or water (max. +50�C). Install the sealsinto their grooves in the rear bearing.

Place the distributor into the pilot cylinder. Check that the distributor is the right way round.Using a plastic mallet, tap the rear cylinder into the pilot cylinder.

Fig 34. Assembling the distributor, the piston rear seals and rear bearings

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Push the pilot cylinder assembly into the body cylinder (1). Mount piston into pilot cylinderand push front bearing to it’s position inside pilot cylinder (2). (Fig. 35)

1. 2.

Fig 35. Assembling the pilot cylinder

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3.2. Rotation motor

Make sure, that all parts and motor housing in body cylinder are clean and studs aremounted fully home. Lubricate all parts and housing properly, install new O–rings. Placespring washer to the bottom of the housing. Push balance plate to it’s place, locateaccording guide pin in housing. Place spacer pin inside balance plate.

1

23

4

5

6

78

9

10

11, 12

Fig 36. Assembly of rotation motor

1. Stud 7. Disc valve

2. Cardan shaft 8. Space pin

3. Flange 9. Balance plate

4. Gear wheel set 10. Spring washer

5. Channel plate 11. Hex. nut

6. Valve drive 12. Lock washer

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Place disc valve (1) on top of the balance plate, mark (with chalk or ink) drive spline tip,which lines up with the hole (A) on outer rim of the valve.

Mark drive spline bottom of valve drive shaft which counteracts with the marked spline indisc valve. Place valve drive (2) inside disc valve, the end with widest splines (5mm) ismounted into the disc valve. Push channel plate to it’s place.

Mount gear wheel set and align rotor (3) so that bottom of the external teeth is aligned withthe marked spline of valve drive. Turn rotor counterclockwise until splines engage with thesplines on the valve drive.

3

1

A

2

Fig 37. Gearwheel set, OMS motor

Install the shaft and the hydraulic motor cover. Ensure that the studs are fully tightened.Tighten the nuts in a crosswise pattern first to 40 Nm. The final tightening torque is 80 Nm.

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3.3. Assembling and centralizing the stabilizer piston seal

Fit the punch (2, See ”Special tools”, item 19) to the piston (1). First mount the O–ring onthe punch and push the seal carefully in place by punch (4, See ”Special tools”, item 20).Take off the punches. Centralizing the piston seal, lightly push oiled punch (5, See ”Specialtools”, item 21) over the seal. The seal will settle into the correct position and form.

ÎÎÎÎÎÎ

ÎÎÎ

12

3

45

Lubricate stabilizer all parts. Mount stabilizer pistons into their cylinders thru sealcentralizing punch (5) in order to avoid seal damages during assembly. Make sure, thatcoated (marked with VC on bottom face) stabilizer pistons are aligned with the 3 recessesin pin housing.

Mount O–rings (1) on the spigots of stabilizer spacer and pin housing. Push (or tap gentlywith rubber mallet) pin housing to it’s position.

1

2

VC

Fig 38. Assembling of stabilizer spacer and pin housing

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3.4. Stabilizer spacer

Hit the bearing through the holes in the bearing housing so that it collapses, and removethe bearing.

Fig 39. Removing the bearing

Press a new needle bearing (2) into its position with a special tool (no. 1, page 40).Replace the rotation shaft seal (3) and O–rings (4).

2 13

ÈÈÈÈÈÈÈÈÈÈ

ÈÈÈÈÈ

4 44

Fig 40. Replacing the shaft seal and bearing

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Install the piston seals in their grooves. Lubricate the seals thoroughly and soften themcarefully with your fingers. Alternatively, the seals can be softened in warm oil or water(max. +50°C).

Fig 41. Installing the seals

Insert the bearing housing (1) and the spherical roller bearing (3) into the spacer (4).

1

3

4

Fig 42. Installing the seal housing and roller bearing

Turn the rock drill’s installation base to horizontal position.

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Install the O–rings at the end of the body cylinder and on the spacer hub with grease.Install the rotation motor shaft (1) in the rotation motor. Install the spacer (2), and lubricatethe cap nut (3) (2 pcs) threads with grease. Pre–tighten (tightening torque 200 Nm) thecentermost side bolts to secure the spacer.

1

2

3

Fig 43. Installing the spacer

3.5. Installing bearings of gear housing1. Press the gear housing bearings 1 and 2 (Fig. 44, 45) into position using a

hydraulic press and punches (6, 7 and 11, See ”Special tools”). In order to makeinstalling easier, the gear housing can be cautiously warmed up (max. 150�C).

ÍÍÍÍ

ÍÍÍÍ

ÍÍÍÍÍÍÍ

ÍÍÍÍÍÍÍÍÍÍÍÍÍ ÍÍ

Í ÍÍ 1

7

11

Fig 44. Gear housing rear bearing

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ÍÍÍ

ÍÍÍ

2

11

6

Fig 45. Gear housing front bearing

Install the needle bearing into the bearing housing of the rotation shaft using a punch 26(See ”Special tools”).

26

Fig 46. Installation of needle bearing

Install the O–ring into its groove and install the bearing housing into its position in the gearhousing. Make sure that the bearing housing is pushed fully home.

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Turn the drifter to vertical position.

Locate stabilizer pins into their holes in pin housing (3). Make sure the pins are assembledin the exact same way they we’re removed (marked ends towards chuck). Place lowerside washer (2) of gear on rotation shaft.

Install the gear housing into position. Install primary gear (1) and it’s upper side washersimultaneously.

Lubricate the threads of the cap nuts (4) (4 +2 pcs) with graphite grease. Tighten the nutscrosswise in two stages, first to 200 Nm and final tightening for all 8 nuts to 400 Nm.

1

23

4

2

5

Fig 47. Assembling of gear housing and primary gear

1

23

4

5 6

7 8

Fig 48. Tightening order

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3.6. Installing chuck, rotation bushing and stabilizer accumulator

1. Push chuck (1) into the rotation bushing (2) install the assembly into the gearhousing. Place coupling piece (3) into position.

2. Install the Allen screw (4) and the seal (5).

Install stabilizer accumulator (6) with new gasket (7). Tighten bolts in 2 phases,pre–tighten 100 Nm and final torque 200 Nm.

Place front (8) and rear (9) feed rope mounting clamps to spacer claws, fasten with boltstorque 240 Nm (Fig. 49).

1

23

45

6

7

8

9

Fig 49. Assembling of chuck, rotation bushing and stabilizer accumulator

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3.7. Installing of flushing housing1. Check that the mating surfaces of the flushing housing and the gear housing are

clean. Install the gasket (1) to the mating surface of the flushing housing. Locateshank and seal housing inside the flushing head body. Install the flushing housingassembly into position.

2. Lubricate the threads of the fastening bolts (2), and install the locking washer pairsinto position. Tighten the bolts in two stages: first to 200 Nm, and final tighteningto 400 Nm.

2

1

Fig 50. Assembling of the flushing housing

Detach rock drill from assembly stand.

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3.8. Pressure accumulators, hose connector flanges, rear cover1. Remove the protective plugs from the pressure accumulator connection, and

clean the mating surfaces of the accumulator and the rock drill body.2. Install the O–ring and the gasket.3. Check that the accumulator fastening bolts turn freely in the threads on the rock

drill body. Install locking washer pairs and lubricate the fastening bolt threads.Cross tighten the bolts in two stages: first to 100 Nm, and final tightening to 200Nm.

4. Place rear cover with gasket to into position and cross tighten bolt in 2 phases (50Nm and 100 Nm).

Fig 51. Assembling of accumulators, connector flanges and the rear cover

5. Attach hose connector flanges, use lubricating grease to hold the O–rings in theirgrooves during assembly. Check, that shank lubrication can flow through rockdrill from connector flange to lubrication outlet.

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Surface model

UG model

Fig 52. Oil outlet in rock drill

Filling of pressure accumulator, see ”Pressure accumulators, repair instructions”.

Accumulator pressures

Accumulator type Pressure [bar]

High pressure 50

Low pressure 4

Stabilizer accumulator 8

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4. TEST RUN

General

After completed maintenance, the rock drill can be tested in the TAMROCK ServiceContainer using the hydraulic powerpack. Test run can be carried out on the floor of theservice container with the rock drill lying on a piece of cushion rubber, for instance.

The rock drill may not be test run on the assembly stand! The shank mustbe removed before test run.

The purpose of test run is to check the operation of the percussion and rotationmechanism of the rock drill, and to see if any major leaks are observed. When testing therotation mechanism, the hoses to the percussion mechanism must be connected to therock drill to enable the internal lubrication of the rotation motor to operate.

Wear hearing protectors when the powerpack is running!

Before test run1. Using a double nipple, connect the hoses of the powerpack to make a loop so that

the lines of both pumps form their own closed circuits.2. Start the powerpack.3. Pull the levers of both control valves into operating position, whereby oil starts

flowing through the systems in free circulation.4. Allow the powerpack to run for about 3 minutes, after which it is ready for test run.

��

WARNING!

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��

��

� ��

��

�

��

��

1. Tank 6. Pressure relief valve

2. Electric motor 7. Pressure gauge (percussion)

3. Double pump 8. Pressure gauge (rotation)

4. Control valve (percussion) 9. Return filter

5. Control valve (rotation) 10. Differential pressure valve

Test run1. Connect the rock drill according to the hydraulic flowchart.2. Make sure that:

– There is enough oil in the tank (1).– The control valve (4) and (5) levers are in neutral position.

3. Start the powerpack.4. Start percussion by pulling the control valve (4) lever towards yourself.5. Start rotation by pulling the control valve (5) lever towards yourself. You can

change the direction of rotation by pushing the lever to the other extreme position.6. Continue the test run for about 5 minutes, and observe possible leaks.

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5. SPECIAL TOOLS

1. 550 056 57 10. 150 551 68

2. 152 248 88 11. 550 055 57

3. 550 055 88 12. 550 054 94

4. 550 057 30 13. 550 054 80

5. 150 545 68 14. 150 746 48

6. 550 055 68 15. 152 249 08

7. 151 866 08 16. 550 057 16

8. 550 056 20 17. 449 701 50

9. 150 546 98 18. 449 697 70

D 23700 – 2 en 0602 / JS


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19.

ÎÎÎÎÎÎ

ÎÎÎÎÎÎ

150 679 28 23.

20. 150 680 98 24.

21. 150 678 08 25.

22 26.

Fig 53. Tool kit id. number: 550 065 07

The table shows some special tools in the tool kit 550 065 07. A complete listing of thecontents of the tool kit is provided in the spare part manual.

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D 28160 -- 6 en 1201 / PIR

PRESSURE ACCUMULATOR FOR HYDRAULIC ROCK DRILLRepair instructions

1 (12)


E

CONTENTS

1. GENERAL 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. CHECKING THE FILLING GAS PRESSURE 3. . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. REMOVING THE PRESSURE ACCUMULATOR FROM THE ROCK DRILL 3.

4. DISMANTLING THE PRESSURE ACCUMULATOR 4. . . . . . . . . . . . . . . . . . . . . .

5. CHECKING THE PRESSURE ACCUMULATOR 4. . . . . . . . . . . . . . . . . . . . . . . . .

6. ASSEMBLY 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7. FILLING 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.1. Filling device of pressure accumulators 7. . . . . . . . . . . . . . . . . . . . . . . .7.2. Filling instruction 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.3. Filling pressures of accumulators 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.3.1. Low pressure accumulator (LP) 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.3.2. High pressure accumulator (HP) 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.3.3. Pressure of stabilizer accumulator 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8. MOUNTING THE PRESSURE ACCUMULATOR ON THE ROCK DRILL 11. . . .

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1. GENERAL

As in all hydraulic machinery so also in hydraulic drill rigs cleanness is the most importantconsideration if trouble--free operation is to be ensured. We therefore recommend that allmaintenance work of the accumulators is done in a clean and dustless room.

The condition of pressure accumulator should be checked always when the accumulatoris dismantled and when the rock drill is overhauled. The rock drill special tool set includesall the tools needed in maintenance and checking the accumulators.

Experiences have shown that the first (originally fitted) accumulator diaphragm does notreach the normal service life, particularly if the time interval between the pressurizationand taking into use is long. For this reason the accumulators supplied as spares areunpressurized. There is a note of this on the accumulator.

The accumulator bottom and cover should always be kept as a pair. Tamrock suppliescovers and bottoms only as a pair; other parts such as diaphragms and filling valves canbe obtained separately.

Only qualified service personnel may service the pressureaccumulators. The following instructions must be strictly observed;failure to do so may cause a danger of accident.

Before removing the accumulator from the rock drill, discharge theaccumulator pressure by opening the filling valve.

Repairof apressure accumulatorbyweldingorby othermeans is strictlyforbidden.

While using the gauge, the pressure relief hole must always be pointedto the opposite direction from any persons close by to avoid personalinjures in case the sudden pressure discharge.

WARNING

WARNING

WARNING

WARNING

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2. CHECKING THE FILLING GAS PRESSURE

Check the accumulator filling gas pressure once a week. The rock drill special tool setincludes two pressure gauges for this purpose: one gauge with the scale 0...100 bar forthe high pressure accumulator, and the other with the scale 0...10 bar for the low pressureaccumulator.

a b

1. Remove the cap (a).2. Screw the pressure gauge to the filling valve.3. Undo the lock nut (b).4. Wait until the needle of the gauge stops and then read the gauge indication.5. Close the lock nut (b).6. Unscrew the gauge from the filling valve and fit the cap (a) in place.

3. REMOVING THE PRESSURE ACCUMULATOR FROM THE ROCKDRILL

Pressure accumulator can be changed without demounting the rock drill from the feed.If you for some reason cannot immediately install a new accumulator, must the open oilchannels be covered thoroughly with eg. plastic plugs.

1. Discharge the accumulator pressure by opening the filling valve!2. Undo the accumulator bolts (wrench size 24 mm).

Do not start the hydraulic powerpack if an accumulator is not in place inthe rock drill.

WARNING

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4. DISMANTLING THE PRESSURE ACCUMULATOR

Before dismantling the accumulator, be sure it has no pressure.

1

2

1. Fasten the assembly stand (1) in the vice, and place the accumulator in the standwith the bottom upwards.

2. The same number appears both on the accumulators cover as well as on thebottom. The cover and the bottom must remain paired.

3. Make sure that the filling valve is open!4. Open the accumulator bottom with the opener (2).

5. CHECKING THE PRESSURE ACCUMULATOR

1. Check the accumulator visually for wear, damage, corrosion, etc.2. Clean and check the threads carefully.

If the threads are badly corroded or worn, the accumulator must bescrapped!

WARNING

WARNING

D 28160 -- 6 en 1201 / PIR


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6. ASSEMBLY

a

b

b

20 Nm40 Nm secure with glue

b

10 Nm

b

1. Fit a new or inspected diaphragm in the cover. Make sure that the diaphragm isin the groove and fitted the right way down.

2. Lubricate the surface (a) with vaseline or lanolin.

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Check that the number on the cover and the bottom is the same.

D The high pressure accumulator is marked with uneven numbers and the lowpressure accumulator with even numbers.

HP LP

3. Lubricate the threads of the bottom with vaseline or lanolin.4. Screw the bottom all the way in and tighten it with the special tool to a torque of

150 Nm.D When the pressure accumulator diaphragm is changed, the O--rings (b) should

also be changed.

Check the wear limit marks of the threads always after tightening (150 Nm) of the bottom.If the mark (I) in the bottom remains after the tightening between the dot (S) and the mark(R) in the cover, the thread is in order.

If the mark (I) in the bottom goes beyond the mark (R), are the threads of the accumulatorcover and bottom too much worn. Replace the accumulator and discard the old one.

A worn--out or damaged pressure accumulator must be discardedimmediately.

WARNING

WARNING

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7. FILLING

The only allowable filling gas is nitrogen (N2).

Do not fill an unchecked or a too worn accumulator.

D You can refill the accumulator while mounted to the rock drill.

7.1. Pressure accumulator filling device

N21413,14 151011

12 9 8 7 6 5 3 2

1. Accumulator body2. Filling valve3. Locking nut4. Cap5. Quick coupling stem6. Quick coupling sleeve7. Hose8. Accumulator pressure gauge9. Gas bottle pressure gauge10. Pressure reducing valve11. Pressure regulating valve12. Shut--off valve13. Adapter14. Seal15. Elbow adapter

WARNING

WARNING

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7.2. Filling instruction

1. Remove the cap (4).

2. Screw the elbow adapter (15) to the filling valve (2).

3. Push the quick coupling sleeve (6) onto the stem (5).

4. Undo the locking nut (3).

5. Turn the pressure regulating valve (11) open.

6. Open the nitrogen bottle valve (12). The gauge (9) indicates the pressure in thebottle.

7. Adjust the pressure in the low pressure accumulator to 5 -- 10 bar by turning theregulating valve (11). Gauge (8) indicates the pressure in the accumulator.

8. Adjust the pressure in the H.P. accumulator with the pressure control valve (11),according to the instructions. Gauge (8) indicates the pressure in the accumulator.Max. pressure is marked on the accumulator.

9. Adjust the pressure of the stabilizer accumulator with the pressure control valve,according to the instructions. Gauge (8) indicates the pressure in the accumulator.

10. Close the filling valve (2) by turning the locking nut (3).

11. Close the nitrogen bottle valve (12).

12. Turn the pressure regulating valve (11) open.

13. Disconnect the quick couplings (5) and (6).

14. Release the elbow adapter (15) from the filling valve (2).

15. Mount the checking gauge (0--10 bar) in to the low pressure accumulator fillingvalve (2) andbyopening the locking nut (3) let the pressure flow out until the gaugeshows 3 -- 5 bar.

16. Tighten the locking nut (3) to 20 Nm.

17. Refit the cap (4).

18. Assure the tightness of the accumulator by immersing it in water. Dry theaccumulator carefully for example with compressed air.

19. If the accumulator is not taken into use directly, release the pressure and store itin a dry place protected from dirt.

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7.3. Filling pressures of accumulators

7.3.1. Low pressure accumulator (LP)

Low pressure accumulator damps hydraulic vibrations in the return line. It also preventscavitation in return lines and channels. To get the optimum result of LP--accumulator, gaspressure should be half of the return line pressure. Normally it’s from 3 to 5 bars.

7.3.2. High pressure accumulator (HP)

The main function of high pressure accumulator is to store pressurised oil during thereturn stroke of the piston. This stored pressure can be utilized during the next pistonstroke. Another vital function is to dampen vibrations. HP--accumulator gas pressureshould be related to the set max. percussion pressure according to graph below.

Stem--type diaphragm

0

10

20

30

40

50

60

70

80

90

100

100 120 140 160 180 200 220

Percussion pressure

Fillingpressure

Upper limit

Lower limit

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Normal (stemless) diaphragm

0

10

20

30

40

50

60

70

80

90

100

100 120 140 160 180 200 220

Percussion pressure

Fillingpressure

Upper limit

Lower limit

7.3.3. Pressure of stabilizer accumulator

HLX 5 T . . . . . . . . . 8 bar

HL 700 T . . . . . . . . . 30 bar

HL 700 ST . . . . . . . 30 bar

HL 1500 . . . . . . . . . 50 bar

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8. MOUNTING THE PRESSURE ACCUMULATOR ON THE ROCKDRILL

D See “Hydraulic rock drill, repair instructions“.

1. Before mounting the accumulator on the rock drill, remove the cover plugs fromthe accumulator connection port, and clean the joint surfaces both in theaccumulator and in the rock drill.

2. Check that the bolts move easily in their threads in the drill body. Lubricate thethreads of the bolts.

3. Fit the O--ring and the gasket.4. Tighten the pressure accumulator bolts in two phases:

pretightening 100 Nm, final tightening 200 Nm.

2

34

1

Tightening of the four--bolt accumulator

The four---bolt accumulator must be tighten by using a cross---tighteningmethod 1--3--2--4.

CAUTION

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Notes:

rock drill

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