test 924g, 1. general testing and adjusting

Pruebas y Ajustes 924G and 924GZ Wheel Loaders Hydraulic System

Pilot System Pressure - Test SMCS - 5050-032-PS

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Producto: WHEEL LOADER Modelo: 924G WHEEL LOADER 3PZ Configuración: 924G 924Gz Wheel Loader 3PZ00001-UP (MACHINE) POWERED BY 3056 Engine

Número de medio -RENR3511-03 Fecha de publicación -01/03/2007 Fecha de actualización -09/03/2007

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Table 1Required Tools

Quantity Part Number Description 2 8T-0856 6000 kPa (870 psi) Pressure Gauge 2 177-7860 Hose Assembly 4 6V-4143 Coupler Assembly 2 6V-3989 Nipple

NOTICECare must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.

Dispose of all fluids according to local regulations and mandates.

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1. Remove the access panel on the right side of the machine.

1. Install a 8T-0856 Pressure Gauge on a 177-7860 Hose Assembly . Install the other end of the hose to the test port (2) for the steering pressure in the pressure reducing valve. Note: Prior to testing the pilot system pressure, make sure that the standby pressure of the steering pump is within the specification. The maximum standby pressure of the steering pump is 4300 ± 170 kPa (625 ± 25 psi).

2. Install a 8T-0856 Pressure Gauge on a 177-7860 Hose Assembly . 3. Install the other end of the hose assembly on the test port for the pilot pressure (1) .

Illustration 1 g00623972

Illustration 2 g00623709Pressure reducing valve

(1) Test port for the pilot oil pressure in the pressure reducing valve. (2) Test port for the steering pressure in the pressure reducing valve. (3) Relief valve.



4. Start the engine and run the engine at high idle. With the oil at normal operating temperature, the pressure reading must be 2600 ± 170 kPa (375.0 ± 25.0 psi).

5. If the pressure reading is correct, stop the engine and remove the test equipment from pressure tap (1) . If the pressure reading is not correct, stop the engine. Perform the following procedure:

a. Loosen the locknut on the relief valve (3) . Turn the stem on the relief valve clockwise in order to increase the pressure. Turn the stem on the relief valve counterclockwise in order to decrease the pressure.

6. If the pressure reading is correct, stop the engine and remove the test equipment from the pressure tap (1) .

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Fri Sep 9 21:56:24 EST 2011




Hydraulic System Pressure - Release SMCS - 4250-553-PX ; 4300-553-PX ; 5050-553-PX

1. Lower the work tool to the ground. 2. Stop the engine. Engage the parking brake.

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Personal injury can result from hydraulic oil pressure and hot oil.

Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.

Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.






3. Move the control levers through the full range of travel. Repeat the movement of the levers several times in order to discharge the accumulator for the pilot system. This will relieve any pressure that may be present in the work tool hydraulic system.

4. Depress the brake pedal repeatedly. This will relieve any pressure that may be present in the brake hydraulic system.


Fri Sep 9 22:12:31 EST 2011




General Testing and Adjusting Information SMCS - 5050-025; 5050-081

Note: Permit only one operator on the machine. Keep other personnel away from the machine or in the operator's sight.

1. Park the machine on a smooth, level surface. Move away from other operating machines and away from personnel.

2. Lower the work tools to the ground. Stop the engine.

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Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.

To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system.






3. Engage the parking brake. Place blocks in front of the wheels and behind the wheels. 4. When the work tool is raised for testing or for adjusting, make sure that the work tool is

supported correctly. Also, make sure that the work tool is fully in the DUMP position. The lift circuit has high oil pressure when the lift arms raise the front of the machine. Note: When you stop the machine, make sure that the front of the machine is not off the ground. Unless raising the machine off the ground is required for a test, lower the machine to the ground and stop the engine.

5. Install the steering frame lock so that the machine cannot articulate. 6. Turn the key to the ON position without starting the engine. Cycle the hydraulic control levers

through all positions in order to release the pressure in the hydraulic system. Place the tilt control lever in the FLOAT position. Place the lift control lever in the HOLD position.

When any test is performed on the hydraulic system, the hydraulic oil must be at the normal operating temperature. During a diagnosis of the hydraulic system, remember that correct oil flow and correct pressure are necessary for correct machine operation. The pump output increases as the engine speed increases and vice versa.


Fri Sep 9 22:19:43 EST 2011



test 924g, 1. general testing and adjusting

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