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Personal injury or death can result from sudden machine movement. Sudden movement of the machine or release of air pressure or oil pressure can cause injury to persons on or near the machine. To help prevent possible injury before testing and adjusting any air system or hydraulic system, perform the procedure in the Testing and Adjusting, "General Information" section. |
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Hydraulic oil pressure can remain in the hydraulic system on this machine after the engine and pump have been stopped. Serious injury can result if this pressure is not released before any service is done on the hydraulic systems. In order to prevent possible injury, release the hydraulic system pressure before working on any fitting, hose, or hydraulic component. Lower all attachments to the ground before service is started. If the hydraulic system must be serviced, tested, or adjusted with the attachment in the raised position, the attachments and lift cylinders must be supported properly. Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made. |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Dispose of all fluids according to local regulations and mandates. |
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| Target | Actual |
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Operation and Maintenance Manual, "Changing Direction and Speed"
Operation and Maintenance Manual, "Operator Controls"
Operation and Maintenance Manual, "Use of Wheel Chocks"
Operation and Maintenance Manual, "System Pressure Release"
Operation and Maintenance Manual, "Cable (Truck Body Retaining)"
The following instructions contain the necessary information to test the lubrication pressure for the final drives.
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| Illustration 1 | g02720684 |
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Digital Pressure Indicator Group (A) | |
| Tool | Item | Qty | Part No | Description |
| A | 198-4240 | Digital Pressure Indicator Gp | ||
| A1 | 1 | 198-4234 | Digital Indicator | |
| A2 | 1 | 198-4237 | Pressure Sensor Gp
(0 to 3,445 kPa (0 to 500 psi)) |
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| A3 | 1 | 198-4236 | Adapter Cable As | |
- Park the machine on a dry, level, solid surface that is free of any debris.
Note: The surface must be solid enough to support the weight of the machine and any tooling that is used to support the machine.
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Illustration 2 g06339792 (A) Shift control lever - Make sure that shift control lever (A) is in the PARK position. Parking brake is applied when shift control lever (A) in the PARK position. Refer to Operation and Maintenance Manual, "Changing Direction and Speed" for more information.
- Move the hoist control to the FLOAT position to lower the dump body. Refer to Operation and Maintenance Manual, "Operator Controls" for more information.
- Install wheel chocks on the machine. Refer to Operation and Maintenance Manual, "Use of Wheel Chocks" for more information.
- Ensure that the pressure is released from any closed system that will be opened during the maintenance procedure. Refer to Operation and Maintenance Manual, "System Pressure Release" for more information.
Note: Use the Advisor display and a certified hand gauge to verify pressure release in each system.
- Perform the steps in the "Test Preparation".
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Illustration 3 g06340158 View of the front of the rear axle
(1) Oil filter - Connect tooling (A) to the pressure taps on oil filters (1).
- Start the engine. Run the engine until the final drive lubrication oil temperature is above
60° C (140° F) . - With the engine at high idle, record the pressure from tooling (A) in Table 1.
- Stop the engine and remove the test equipment.
- For the pressure on the other filter, perform Step 1 through Step 5 on the other filter.
If the correct pressure is not achieved, the following items should be checked.
- Check for blocked filters.
- Check for any fault codes for the temperature sensor, pressure sensors, and solenoid valves.
- Ensure that the oil temperature and oil level is correct.
- Ensure that the motor is getting flow from the priority valve and manifold.