TECHNICAL DESCRIPTIONPARTNER2002-04

PARTNER K650/K700 ACTIVE IIIThe Partner K650 Active III and K700 Active III,along with their predecessors, are the most well-established models in the Partner range. Theyboth belong to the medium-size segment andthey are ideal for all normal cutting jobs.

The Partner K650 Active III is designed for 300mm (12 ) cutting discs, while the K700 Active IIIis intended for 350 mm (14 ) cutting discs.

The Partner K650 Active III and K700 Active IIIare the result of development spanning severalmodel generations. Both machines share thesame basic design, while several features placethese two models in a class of their own:

– Highest power in this weight class.

– Ergonomic design to ensure that the machineis comfortable and simple to use, and at thesame time safe in everyday operation.

– Operating reliability, long service life and minimum service requirements, all of which arecrucial to good cutting economy.

– The unique filter system cleans the intake airefficiently utilising three different filtration prin-ciples, thus promoting long service intervals.

– The carburettors in the Active III are of an en-tirely new design. The SmartCarb™ carburettormaintains a constant blend of air and fuel irres-pective of the condition of the air filters. As aresult, the machine’s performance is virtuallyunaffected by dirty filters. Unchanged power out-put between services and lower emissions aretwo of the benefits of the new carburettor.

– The starter is of an all-new design. The DuraStarter is sealed from dust and features greaselubrication. The pulley is spring-loaded and isthus not subject to vibration induced wear.

– The petrol tank has a window so the operatorcan always see exactly how much fuel is left.

– Partner offers a range of accessories for special cutting jobs, as well as cutting bladesdeveloped specifically for hand-held cutting.

1. Centrifugal force is the first stage in cleaning theintake air of the K650/K700 Active II. Centrifugal clean-ing was previously only used on larger engines in dustyenvironments, for example for construction machines(cyclone air filter).

The fan vanes on the fly-wheel supply the cylinderwith cool air at the sametime as they act as the ac-tive part of the centrifugalfiltering system for the engine’s intake air.

The intake nozzle is fittedjust beside the flywheelvanes. Under centrifugalforce, the larger particleswill not follow the curvedcurrent of air to blue nozzle but are instead thrownagainst the outside of the nozzle. Only very small dustparticles will be able to follow the current of air leadinginto the blue intake. Tests show that more than 80% ofall dust is siphoned off by the centrifugal cleaning process.

2. The foam filter is the nextstage of separation in the filtra-tion process. This filter coversthe housing’s entire surface,thus offering a filter surface ofno less than 200 cm2. An airdeflector guides and distributesthe air across the entire filtersurface, so the whole filter is moreefficiently utilised at a regular rate.

The filter is soaked in oil and ismade up of three layers, eachintended for a different pore size.

Inside the filter, the air flowsthrough a structure pretty muchlike a labyrinth. Dust particleswhich strike against the filter sidesdo not bounce off but instead fas-ten to the sticky oily surface. A dryfoam filter offers far less efficientcleaning performance than an oil-soaked filter.

An oiled foam filter is by far themost effective filter for cleaning ofstone dust, since the entire filter volume is used as a“dust trap”, not just the surface. The total dust-absor-bing filter area is accordingly enormous. The foam filterabsorbs about 95% of the total dust volume remainingafter centrifugal filtering. It can be washed clean andmust be oiled at each service.

3. The paper filter deals with thesmall amount of dust particleswhich, more by chance than any-thing else, may manage to slipthrough the foam filter. Only a tinyamount of extremely small dustparticles will ever get as far as thepaper filter. The filter’s densenetwork of cellulose fibres traps all incoming particles.

The paper filter also serves as a protective barrierduring filter services. The paper filter should be changedtwice a year or more frequently when used in severeconditions.

2

Filter SystemCutting in stone and concrete generates tiny dust parti-cles which must be prevented from entering the engineat all costs. The design of the air filter and its mainte-nance are the two most important factors governing theservice life of the cutter. Designing a good air filtersystem is a matter of balancing effective filtering withlong service intervals.

The development of more efficient filters has improvedair-cleaning performance, but service intervals have bytradition still been inconveniently short in power cutters.Rental firms inherit the problems caused by customerswho do not carry out the necessary service during therental period, or are faced with the cost of travelling fre-quently to various work-sites to carry out the necessaryservice.

Dust consists of extremely fine particles, generally sosmall that one individual dust particle cannot easily bedistinguished by the naked eye but which in larger quan-tities can be seen as a cloud of dust. When cutting stoneor concrete, the dust created generally is of the mostdamaging kind of particles for an engine’s sliding or rota-ting components. Together with oil, this dust forms aperfect grinding paste which quickly wears away pistons,piston rings, cylinder walls and engine bearings if itpenetrates an engine.

We generally measure dust particles in gm (1 µm =0.001 mm), thousandths of a millimetre, and the particlesizes which are dealt with by the filter system generallymeasure between 50 µm and 5 µm. (It takes roughly 2minutes for a stone particle measuring 10 µm to fall 1 min wind-still conditions.)

One physical characteristic which is vital to the func-tion of the Partner Active Air Filtration system is thebehaviour of dust particles in air currents depending onparticle size.

A small particle is more easily affected by a current ofair than a larger particle.

The reason for this is that small particles have a largersurface in relation to their mass. Therefore a small par-ticle can be steered or guided more easily by a currentof air while a larger particle succumbs to centrifugalforce or the force of gravity.

Partner Active Air Filtration is a filter system whicheffectively cleans the air entering the engine in three sep-arate stages, utilising three different cleaning principles.

The most immediate practical benefit of Active AirFiltration is that the service intervals are far longer com-pared to previous systems.

Air filtration principle

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SmartCarb™The SmartCarb™ fil-ter-compensating car-burettor has an airduct (C) which linksthe carburettor’s fuelchamber directly tothe filter chamber. Thefuel chamber has nolink to the air outsidethe machine.

This air duct ensures that the air pressure in the fuelchamber (P1) and the filter chamber (P3) remains equal at all times. Only the pressure drop created by the ven-turi tube (P2) determines the amount of fuel which is tobe mixed with the intake air. Therefore, irrespective ofwhether the filter system is clean or dirty, the relationshipbetween air and fuel will remain constant at all times.

The above diagram (showing a laboratory test) demon-strates the considerable effect of SmartCarb™ on enginepower. Air pressure is measured at the carburettor’s inletand the figure 0 is set for brand-new filters and with theengine running at normal speed. As the filters accumu-late dirt, the pressure drops owing to the increasedbuild-up of air resistance.

At a pressure drop of just 100 mm Vp, the standardcarburettor provides such a rich fuel/air mixture that thefilters must be replaced or the H-needle has to beadjusted. The SmartCarb™ carburettor offers excellentengine performance all the way to 500 mmVp.

With the standard carburettor, the engine loses powermainly because it is having to work with the wrongair/fuel ratio, while the power drop with the SmartCarb™– which only becomes apparent once the filters areseverely polluted – stems from the fact that the enginereceives less air and fuel owing to the air resistance caused by the blocked filters.

In practical terms, the pressure drop in the diagramcan be translated into corresponding operation times,where we can see that the SmartCarb™ engine offersmany times the standard operating duration between filter service!

Long Service intervalsThe effect of the filter’s gradual dirt accumulation is verydifferent with the SmartCarb™ compared to a conven-tional carburettor. Together with the efficient filtersystem, the SmartCarb™ drastically reduces servicerequirements and thus also running costs.

CarburettorSmartCarb™ – carbu-rettor with integrated filter compensationThe new carburettor inthe K650/K700 Active IIIcompensates for pres-sure differentials be-tween the outside airand the pressure insidethe carburettor inletafter the air has passedthrough the filter system. This means that the machinealways operates with the correct air/fuel mixture, virtuallyirrespective of how soiled the filters are.This design results in:– high and more uniform engine power– better filter economy– lower fuel consumption– lower emissions

Carburettor opera-ting principleTo understand the wayin which the Smart-Carb™ carburettoroperates, we will firstdescribe how a con-ventional carburettorworks.

The carburettor’smain job is to supplythe right mixture of fuel and air to the engine. Every car-burettor has a Venturi tube (A), in which the high speedjet (B) for petrol supply is fitted. When the engine sucksin air through the carburettor, the fuel is sucked downinto the Venturi tube and mixed with the air.

A more detailed explanation is that when the air flowsthrough the Venturi tube, air velocity increases, thus caus-ing pressure to drop in the Venturi (the Bernoulli theorem).The pressure differential between the carburettor’s fuelchamber (P1) which operates under constant air pressure(atmospheric pressure), and the Venturi tube’s negativepressure (P2), causes the fuel to flow out through the jet.

Dirty filtersOne problem with theconventional carburet-tor is that the air/fuelratio graduallychanges as the filtersbecome increasinglyblocked with dirt.

Dirty filters increaseair resistance and pro-mote a drop at (P3)which is added to the pressure drop in the venturi (P2),so that the pressure differential compared with the car-burettor’s fuel chamber (P1) increases. As a result, thecarburettor enriches the mixture, supplying more fuel inrelation to air, which in turn impairs the engine’s perfor-mance.

One way of compensating for dirty filters is naturally to reduce the amount of fuel being supplied by adjustingthe high-speed needle in the carburettor.

Intake air

P3 P2

P1

Intake airP3

C

P1

P2

60

80

100

0 100 200 300 400 500Pressure drop over filter (mm water)

Power %

Intake air

A B

P1

P2

SmartCarb™

Standard carb.

Cylinder/piston

The Partner K650 Active III and K700 Active III have aspecially developed air-cooled two-stroke 71 cc enginewhich is lubricated with two-stroke oil mixed with petrol.The cylinder bore is nickel plated with silicon-carbideinclusions. The piston has two piston rings, and thesmall end is a needle roller bearing

The cylinder and piston are manufactured in a waywhich ensures ideal dimensions during operation. Thepiston is profile-turned and the cylinder is honed for thetemperature – and the accompanying material thermalexpansion – which each part of the cylinder and pistonexperience during operation. For example, the piston,when seen from the side, has a somewhat barrel-shapedprofile, while the view from above reveals a slightlyasymmetrical oval shape.

The purpose of this design is to compensate for thermal expansion and to minimise friction losses. Thisproduction method is both complex and expensive.

Decompression valveA high-compression 71 cc engine,as on the K650/K700 Active III,offers relatively high resistance atthe starter cord. The decompres-sion valve solves this problem in asimple and efficient way.

When starting the machine, thevalve is first opened by pressingthe button. When the operatorpulls the starter cord, most of thecompression pressure exits through the valve and thestarter cord’s movement is both gentle and even. Assoon as combustion takes place in the cylinder, thevalve is shut automatically by the combustion pressureand the engine operates normally. The ‘DecompressionValve’ is positioned in the top of the cylinder wall so thatwhen the piston is at TDC, the decompression valvelines up between the two piston rings, therefore theupper piston ring shields the decompression valve fromcarbon.

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Starter unitThe Dura Starter is a new patent-pending starter unitdesigned specifically for the dusty operating conditionsin which power cutters are used.

In conventional designs, the pulley is in constantmotion caused by vibration, so it is impossible to seal.This allows stone dust to enter into the starter unit.Vibration and dust work together to create an unintend-ed but extremely effective grinding operation.

Dura Starter – new dust-excluding designThe principle of the new starter unit is that the pulley isprotected from vibration-induced movement. This makesit possible to fit a series of seals to protect the greaselubricated return spring and journal bearing.

The spring above the pulley exerts a tensioning forceagainst the centre screw and acts as a brake on vibra-tion-induced movement. An O-ring above the springprevents dust from penetrating into the pulley’s bush.The spacer sleeve around the centre screw is the pulley’supper bearing point and the entire pulley is journalled ina slider bearing against the starter casing’s bearing pin.

The space betweenthe pulley and thespring cassette is shaped like a circularlabyrinth, which pre-vents dust from movingtowards the centre. The spring cassette issealed against the centre with a spring-loaded sealing lip lying against thepulley, which prevents dust from reaching the greasedbearing pin. The bottom of the spring cassette is thin-walled towards the centre and has a spring action initself, ensuring that the sealing lip mates with the pulleyat the appropriate contact pressure.

Return spring

Sealing lip

Spring

O-ring

Starter cord

Spring cassette

Pulley

Starter casing

Journal bearing

Ignition systemThe ignition systemis completely sealedand has no movingparts. It is insensitiveto moisture and dirt.It is designed so thatthe ignition pointnever needs to beadjusted.

The Partner K650and K700 Active IIIfeatures a built-ingovernor in its elec-tronic module,which limits en-gine speed to9750 rpm.

The ignitionsystem consistsof the primarycoil (A) and thesecondary coil(B), both ofwhich surroundthe iron core (C).A transistorised electronic module (D) deals with thecontact-breaking function.

Current is generated in the primary coil when the fly-wheel’s permanent magnet passes the coil and producesthe voltage sequence shown in the diagram below. (Thedotted line shows the voltage which is generated if thecurrent is not broken.)

The ignition point is determined by the electronicmodule which senses variations in voltage in the primarycoil and cuts the current at the right level, at the sametime as the piston is just below top dead centre. At theinstant that the contact is broken, voltage in the primarycoil rises from 5 V (volts) to about 200 V through a pro-cess of induction.

In the secondary coil, a high tension of about 20,000volts is conveyed to the spark plug.

SilencerThe silencer is of the single-cham-ber type and the exhaust gases aredirected downwards. The shieldbetween the cylinder and silencercools the exhaust port.

Most of the sound from themachine comes from the escapingexhaust gases. The air filter systemacts as an effective intake damperand goes a long way to reducingsound pressure since the intake airis not drawn from above the en-gine. Sound levels are measuredaccording to the CE norm in two ways:– Sound pressure, measured at the operator’s ear.– Sound level, the mean value of the acoustic powerwhich the machine generates, measured at twelve pointsaround the machine on a reflective flooring material(concrete). These measurements are taken at idlingspeed and maximum speed.

See the technical specifications on page 11.

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ClutchThe clutch located betweenthe engine and the cutter isof the centrifugal type. Atidling speed, the clutchshoes are held against thecentre by springs. Thismeans that the cutter discis at a standstill when themachine runs at idlingspeed. As the engine in-creases speed, the springscan no longer hold the shoes in place, and the shoes arepushed against the clutch drum by centrifugal force.Engagement speed is about 3400 rpm. At normal opera-ting speed, centrifugal force is so high that a suddenoverload on the cutter disc will cause the belt to slipagainst the pulley.

Self-lubricating clutch bearingThe clutch bearing on the K650 and K700 Active III islubricated automatically by the engines two stroke oilmixture- a tried and tested Partner speciality. A duct inthe crankshaft opens out at the clutch bearing. The pres-sure which is created in the crankcase by the downwardmotion of the piston is transferred to the clutch bearingkeeping the bearing clear of incoming dust particles andsupplying a small quantity of oil at the same time.

Ignition system principle

Electroniccircuitbreaker

STOPcontrol

Volts+

-

0

Ignitionpoint

SNS

N1

1

A DBC

2

2

3

3

A

B

CD

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Machine bodyThe machine body is cast in magnesium alloy, a materialrenowned for its high strength and low weight. The blockis split according to traditional construction methods intotwo crankcase halves.

Minimum weight combined with stringent demands onstrength and durability are basic requirements for cuttingmachine bodies. The cutting machine is subjected toimmense vibration in normal operation, so innumerablefatigue tests are carried out both in the laboratory and infield conditions to discover any faults or weaknesses inthe casting. The machine body of the K650/K700 ActiveIII is a tried and tested unit which builds further on thedevelopment experience gained from previous models.

Ergonomic designThe K650 and K700 Active III are noted for the clean,slim lines of their engine bodies – all so the operator canwork as conveniently and ergonomically as possible.

In normal cutting operations, the machine is movedstraight back and forth in the cutting groove, and theoperator is close to the machine – in some jobs evenmaintaining direct bodily contact with the machine.Protruding parts on the machine body may easily force it off its intended cutting line if the machine comes intocontact with theoperator or an adja-cent object. This isnaturally a source ofirritation and mayeven constitute asafety hazard.

So Partner powercutters owe theirclean lines to func-tional requirements – with the addedbonus of an attrac-tive appearance.

Slim machine bodyBoth the K650 Active III and the K700 Active III feature amachine body with a particularly slim profile. This pro-perty is of utmost importance to operating comfort andfor carrying the machine. A slim machine has its centreof gravity closer to the operator. Carrying an object atsome distance away from the body is both uncomfort-able and demanding.

Surface treatmentThe machine body is powder-painted, which means thatno solvents are used. Powder paint is sprayed onto themachine body, which is electrostatically charged, to pro-duce a uniform coating which penetrates everywhere.The parts are then baked in an oven and the powderpaint melts to form a thick surface layer which is durableand resistant to mechanical wear.

Crankcase bearingThe crankcase has sturdily dimensioned ball-bearings.These are lubricated by the two-stroke oil mixed in thefuel. The crankshaft’s sealing rings can be replaced fromoutside the machine without the need to split thecrankcases.

Crankshaft/connec-ting rodThe crankshaft andconnecting rod areforged and case-hardened to ensuretop strength anddurability. The con-necting rod has needle bearings onthe crankshaft.

Fuel tankA separate plastic tank is integrated into the machinebody, thus minimising heat transfer from the crankcase. The fuel tank volume is 0.7 land it is sufficient for about40 minutes of operation.

The fuel tank has a windowso the operator can keep aneye on the fuel level.

The fuel pick-up filter,always remains at the bot-tom of the tank so thePower Cutter can receive asupply of fuel irrespective ofthe angle of operation.

The filter design is new. Itis made of sintered poly-ethylene plastic which filtersout the smallest particles.Its high filtration efficiencyreduces wear on the carbu-rettor’s moving parts. Thefilter surface is smooth andrepels dirt. The filter-replacement interval hasthus been increased severaltimes over.

RefuellingThe Partner designers have chosen to position the fuelfiller in line with the machinebody so as to avoid protrusionswhich may get in the way duringcutting operations.

In order to avoid spillage forenvironmental and safety reasonswhile refuelling, we recommendthe type of fuel can which fea-tures an overfill valve.

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Handle systemErgonomics have top priority in the design of everyPartner power cutter. In practical terms, this means themachine must be comfortable and safe to use. A well-built tool will not tire or burden its operator. More workgets done and the risk of injuries are minimised, both inthe long and the short term.

The distance between the handles is important foroverall ergonomics. A short gap means the operatormust use greater force to advance and hold the machineon course. If the distance is too great, the machine isdifficult to control.The ideal distanceas on the K650/K700 Active IIIcorresponds closely to theshoulder width ofthe user.

Handle grips in line with thecutter discA design in which the line of gripon the front and rear handles isaligned with the cutter disc, givesthe best conditions for safe andefficient cutting. The cutter disc isautomatically pressed straightdown into the cutting groove, andthe cut is straight. Crooked cut-ting grooves waste power andimpose extra wear on the cutter’sframe and segment.

Horizontal cutting is more difficult compared to themore common vertical cutting.

In vertical cutting, most of the machine’s weight isexerted on the object being cut and the feed pressure isapplied on the front handle. In horizontal cutting, how-ever, the operator has to support the machine. The fronthandle’s forward-positioned grip in the horizontal posi-tion shifts the weight to the rear handle, thus creatingbetter balance. The operator can easily and comfortablyprovide feedpressure with hisbody against theair filter housing,with the supportof the handlearch.

Vibration suppressionIn prolonged use, vibrating handles cause injuries to theblood vessels in the hands (TVD, often termed “whitefingers”). In brief use, vibration results in impaired sensi-tivity and muscle strength in the hands which, apart fromthe discomfort, also heightens the risk of accidents.

Suppressing vibration in the handle system is some-thing of a designer’s balancing act. A firm handle systemwould, in theory, provide perfect contact and control ofthe machine, if we disregard the harmful effects of vibra-tion. Maximum vibration suppression, on the other hand,would permit considerable movement between handleand machine which would result in poor control over themachine during cutting.

A good vibration suppression system thus alwaysaims to strike a balance between minimum vibration andmaximum control.

The K650/K700 Active III have damper elements placed as far apart from each other as possible, one ateach end of the handle arch and one in the middle. This optimises the machine’s geometry. The entire handle system is built as a single unit, so the operator is subjected to minimum vibration under all working con-ditions.

The damper elements aremade of rubber, or a combi-nation of rubber and metalsprings. In the event of over-loading, movement is limitedby the dampers’ construc-tion, which prevents thehandle from separating fromthe machine body if a rubber damper should break. The safety pin in the rear handle, for instance, fills thisfunction.

Safe starting positionThe rear handle on Partner power cutters is designed toaccommodate a large boot, ideal for locking the machinein a safe startingposition.

ControlsThe basic principle behind the controls needed while themachine is running is that the operator should not needto release his grip on the handle. Therefore, all the con-trols are gathered together on the rear handle – for bothsafe and comfortable operation.

The size and the shape of the controls make themeasy to operate with thick gloves on – gloves shouldalways be used for cutting operations.

Throttle controlThe throttle control hasbeen thoroughly tested. The spring-loaded counter-balance, its stroke, designand precise positioning areall optimised for best “finger-tip comfort”.

Throttle trigger lockoutThe throttle control is blocked in the idling posi-tion – a safety device toprevent accidental acceler-ation. The throttle triggerlockout, on the upper faceof the handle, is releasedwhen the driver grasps thehandle.

Starting throttle catchThe throttle control can belocked in a partially opensetting which ensures thecorrect throttle opening forstarting, with either a coldor warm engine. As soon asthe throttle control is pressed, the catch is re-leased.

ChokeOn the K650/K700 Active III,the choke control is pulledoutwards, a more easilynoticeable indication thatthe choke is engaged. Thechoke control does not acton the throttle shutter;instead, the partial-throttlesetting is governed by the starting throttle catch during start-up.

Stop controlThe stop control cuts theignition sequence whenpushed down.

8

Cutting unitBelt driveThe cutter unit on the K650/K700 Active III, as on mostother Partner cutters, features one drive belt leadingfrom a pulley on the crankshaft to the pulley on thespindle shaft. This design has the multiple advantages of simplicity, reliability and low weight.

It is also important from the safety viewpoint. If thecutter blade comes to a sudden stop, the drive belt willslip and allow the engine to come to a halt more slowly.The cutter arm is split to permit convenient belt replace-ment and adjustment of belt tension.

Semi-automatic belt tensioningOpinions as to what is the “correct” belt tension varyfrom one operator to another. Partner’s semi-automaticbelt tensioning system solves this problem – a standard-ised spring provides the correct tensioning force.– In precisely controlled experiments in the laboratory,Partner has computed the optimum belt tension whichgives the belt maximum service life allied to perfectapplication pressure before it slips against the pulley.

Adjustment of belt tensionBelt tension must sometimes be adjusted owing to stretching and wear of the belt. This is done quickly inthree stages:1. Undo the two screws which secure the cutter arm.2. Turn the adjustment screw so that the square-headed

nut which lies against the spring matches the reference mark on the housing. (The spring now hasthe correct compression rate and the belt has the correct tension.)

3. Tighten the two screws as per stage 1.

Drive beltThe drive belt in a power cutter is subjected to severeand uneven loads and sometimes also to immense loadpeaks. The drive belt also operates on a relatively small-diameter pulleys, particularly the crankshaft pulley, whichimposes particular demands on the belt. The belt’s de-sign is crucial to its strength and durability and to ensur-ing the correct degree of friction against the pulleys.

To the naked eye, the original-specification beltsdesigned for Partner power cutters may look like anyother drive belt, but they are specially designed for theirspecific function. The belt-tensioning rating, which isdetermined by the adjustment spring, is tested usinggenuine Partner belts.

Wet cuttingThe blade guard is equipped with Partner’s wet cuttingkit. The wet cutting nozzles are fitted on either side ofthe guard and distribute water evenly to both sides ofthe cutter blade.

Wet cutting virtually eliminates cutting dust and theblade is cooled at the same time, which in turn prolongsthe blade’s service lift.

The operator can adjust the waterflow, during cutting,with the valve fitted on the front handle.

For cutting in locations without access to a water tap,water supply can be arranged using a Partner pressuretank.

Simple blade replacementThe blade guard has agenerous cut-out to aidblade replacement.

This opening alsogives the operator aclear view of the workingsurface during cutting.

Rotation-inhibitedflange washersBoth the inner and theouter flange washers arelocked in place againstthe spindle shaft so theycannot rotate. The dualconnecting flanges lockthe blade in place se-curely, even if the lock-screw is only tightenedmoderately. This design also prevents undesirable self-tightening. As usual, the lock screw has a right handthread and features a permanent washer.

Replaceable blade bushingPartner power cutters can be equipped with centre bushings to suit various standards. Replaceable centrebushings are available for diameters of 20.0 mm, 22.2 mm,25.4 mm (1 ) and 30.5 mm. The Partner K650/K700Active III are supplied as standard with different centrebushings to suit the market on which they are sold.

9

Reversible cutter armThe cutter arm can bereversed. This makes itpossible to cut close to awall or at floor height withthe blade guard as the onlylimiting factor, in otherwords about 20 mm fromthe cutter disc. Naturally,some of the machine’sergonomic benefits are lostwhen the cutter arm isreversed, but the ability tocarry out certain operationsmay in fact depend on thisfeature.

Blade guardThe blade guard is by far the machine’s most importantsafety feature. The normal task of the blade guard is todirect cutting dust away from the operator, but it mustalso stand up to the effects of a malfunctioning blade.The blade guard is made of steel plate, with its thicknessdoubled at the periphery.

Self-adjusting blade guardThe blade guard is of a newdesign. Instead of fixed set-tings, it features a frictionlock which automaticallyadjusts the position of the

guard to suit current operating settings.

Generally, the rear edgeof the blade guard shouldrest on the object beingcut. The effect of this isthat the particles follow thepath created by the guardand are ejected ahead atrelatively low speed.

Peripheral speedPeripheral speed is measured inmetres per second and is direct-ly proportional to engine speed.By definition, peripheral speed isthe speed at which a given pointon the blade’s circumferencetravels through the air. It is alsothe speed which a given dia-mond segment, for instance, has in relation to its pointof contact during cutting. Another way of looking at theterm “peripheral speed” is to imagine a cutting machineas a moving vehicle with the cutter blade as the drivenwheel. A speed of 5,100 rpm with a 300 mm cutter bladewould give the following speed:

Blade circumference: 0.3 m × π= 0.94 mBlade speed: 5,100 rpm = 85 r/sCircumference × speed = peripheral speedPeripheral speed = 0.94 m × 85 r/s = 80 m/sComputed into a “vehicle-type situation” this gives aspeed of about 290 km/h!

Partner cutter blades are made for peripheral speedsof 100 m/s. A European colour code prescribes a greencolour for a maximum peripheral speed of 100 m/s,while a red colour indicates max. 80 m/s.

BLADE TYPESHand-held power cutters require cuttingblades which areapproved for use inhand-held machines –it is not permissible tofit them with bladesintended for fixed-posi-tion bench-mountedmachines, for example.The speed marking must match or be higher than thefigure on the machine’s specification plate. Partner cut-ting blades are naturally intended for Hand-held cutting.

– The diamond blade is the blade which is becomingincreasingly common for cutting concrete, stone andsimilar materials. The general advantage of the diamond-tipped blade is that it retains its cutting depth virtuallythroughout its life so cutting efficiency remains high.Used correctly, it offers excellent blade economy.

Partner diamond blades are available in several variants and are selected to suit the material to be cut.Put simply, the difference lies in the hardness of themetal which bonds the diamonds together. Diamond blades are available for both dry and wet cutting.

– The asphalt blade is a special variant of the diamondblade, generally equipped with a drop or hammer seg-ment to minimize wear on the blade element.

– Abrasive blades, which used to be the norm for cut-ting all materials, are now used primarily for cuttingmetals. Partner abrasive blades are available for steeland concrete, the concrete blade is also very suitable forcutting softer steel types such as reinforcing rods andstructural steel.

– Partner Rescue is a special blade with a TCT hard-metal cutter. It may only be used by specially trainedpersonnel in emergency rescue situations.

10

Cutter bladesSpecification plateAll Partner power cuttersare equipped with a plateon the blade guard whichdetails all the importantspecifications needed forchoosing cutter blades.

The dimensions whichthe operator needs toknow are the following:

Blade diameterBlade diameter is specified in either mm or inches.

The Partner K650 Active III isdesigned to be used with cutterblades of 300 mm outer diame-ter, corresponding to 12 , whilethe Partner K700 Active III isused with cutter blades mea-suring up to 350 mm outer diameter (14 ).

Centre diameterThe cutter blade’s fitting holesmust exactly match the bushingdiameter on the spindle shaft.Various standards are availabledepending on the countries inwhich the machines are sold.The most common standardsare 20.0, 22.2, 25.4 (1 ) and 30.5mm. Bushings for Partner Power Cutters are available forthese diameters and can be replaced.

SpeedAll cutter blades are marked with a speed which is usuallymeasured in revs per minute(rpm) and which indicates therotating speed which should notbe exceeded. The blade’s maxi-mum speed is determined by theblade manufacturer.

The Power Cutters plate also indicates a speed whichis determined by the machine manufacturer and which istermed the “nominal speed”.

The nominal speed is the speed which is stated on themachine plate and which determines which marking theblade must have in order to be used with the machine.The cutter blade should be marked with the same or higher speed than that specified on the machine plate.

The maximum speed of the machine is a rating whichdoes not affect the machine operator, so it is not speci-fied on the machine but it is used, for instance, as acontrol parameter at the service workshops. The maxi-mum speed is the highest permitted speed which thespindle shaft is allowed to achieve with an unloadedblade and the engine running at full throttle.

According to the European norm, the maximum speedmay not exceed the nominal speed specified on themachine by more than 10%. For example, a machinewith the nominal speed of 5,100 rpm should neverexceed a max. speed of 5,100 × 1.1 = 5,610 rpm.

rpm

m/s

11

Spare partsIn the design of the Partner K650 Active III and K700Active III, as with every other Partner machines, we take into consideration the potential for updating oldermachines with newly developed components.

This policy makes it easier for our service workshopsto offer high service preparedness with generous stocksof parts, even for older Partner machines. Stock-keepingcosts drop since fewer parts variants are required.

The table below lists a few examples, highlightingthose Active III components which are suitable for installation in older machines.

Active III Active II Active

Crankcase ● ●

Crankshaft ● ● ●

Cylinder/piston ● ● ●

Carburettor ● ● ●

Air filter ● ● ●

Ignition system ● ● ●

Flywheel, complete ● ● ●

Starter unit ● ● ●

Blade guard ● ●

Drive belt/pulley ● ●

Silencer ● ● ●

Vibration damper ● ●

Engine kit, complete ● ●

Technical specifications

PARTNER K650/K700 Active III

EngineAir-cooled, 2-stroke 71 ccPower 3.5 kWBore/stroke 50 mm/36 mmCompression ratio 10:1Idling speed 2,500 rpmMax. speed, unloaded 9,750 rpm ± 250

FuelPetrol, min. 90 octane unleaded (green pump)Oil mixture with Partner-oil 2% (1:50)Tank volume 0.7 lFull tank under normal operation lasts approx. 40 min.

CarburettorTillotson SmartCarb™ with built-in filter compensation.

Air filterThree filtration principles:1. Active centrifugal cleaning2. Oil-impregnated 3-layer foam filter3. Dry filter, folded paper insert

Ignition systemTransistorised ignition system, Electrolux typeSpark plugs Champion, RCJ7Y or NGK, BPMR7AElectrode gap 0.5 mm

ClutchCentrifugal clutch with 3 clutch shoesEngagement speed min. 3,100 rpmAutomatic lubrication of clutch bearing

TransmissionBelt type V-beltRatio 2:1

Cutting equipmentK650 Active III:Cutting blade diam. 300 mm (12 )Nominal speed, blade spindle 5,100 rpmCutting depth 100 mmK700 Active III:Cutting blade diam. 350 mm (14 )Nominal speed, blade spindle 5,400 rpmCutting depth 125 mm

Noise emissions (see note 1)Sound power level, measured 115 dB(A)Sound power level, guaranteed LWA 116 dB(A)

Sound levels (see note 2)Equivalent sound pressure level 100 dB(A)

Vibration levels (see note 3)K650 Active III:Idling, front/rear handles 6.8/7.9 m/s2

Full throttle, front/rear handles 6.1/10.1 m/s2

K700 Active III:Idling, front/rear handles 4.9/6.6 m/s2

Full throttle, front/rear handles 4.9/8.8 m/s2

WeightWithout cutter blade, empty fuel tankK650 Active III 8.9 kg (19.6 lb)K700 Active III 9.3 kg (20.5 lb)DimensionsK650 Active III:Length, without fitted cutting blade 625 mmMax. with 220 mmMax. height 370 mmK700 Active III:Length, without fitted cutting blade 625 mmMax. with 220 mmMax. height 415 mm

The CE marking indicates that the manufacturer guarantees that the machinemeets all the requirements of the EU direc-tives, that is to say those safety standardswhich must be met in order for the machineto be sold within the EES block.

Note 1: Noise emissions in the environment measured assoundpower (LWA) in conformity with EC directive 2000/14/EC.

Note 2: Equivalent sound pressure level at the user’s ear.Calculated as the time-weighted energy total for sound pres-sure levels under various working conditions with the follow-ing time distribution: 1/2 idling and 1/2 max speed. Measuredaccording to EN 1454, dB(A) speed.

Note 3: Handle vibrations measured according to EN 1454.

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Partner Industrial ProductsSE-433 81 PARTILLE, Sweden

Tel: +46 31 94 90 00. Fax: +46 31 94 91 14108 07 33-26