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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. |
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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine. |
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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 product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, PERJ1017, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates. |
Reference: Refer to the Operation and Maintenance Manual, "System Pressure Release" for the detailed procedure to release the system pressure.
Reference: Refer to the Operation and Maintenance Manual, "Prepare the Machine for Maintenance".
Reference: Refer to the Testing and Adjusting, "Main Hydraulic Pump Air - Purge"
The pilot circuit of the main control valve is a relatively static fluid chamber. When any fluid is drained from this circuit, this purge procedure to push the air out of the top of the valve to tank is required.
When the pilot circuit is opened during servicing (such as pilot valve end cap unbolted, solenoid replaced, pilot hose for two speed or swing brake release removed), purging air from the hydraulic system is required.
Note: When any large components have been removed or a large amount of fluid has been removed complete the main hydraulic pump air - purge before purging the air from the implement valve. Refer to Testing and Adjusting, "Main Hydraulic Pump Air - Purge".
Use the following calibration procedure to purge the air from the implement valve.
- Position the machine on level ground in the service position.
Note: The machine may shake during this procedure.
| Valve Calibrations |
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| Implement Valve Air Purge Calibration |
- Select the ECM for "Machine Control".
- Select "Calibrations" from the "Service" menu.
- Select "Valve Calibrations".
- Select appropriate calibration to complete. Refer to Table 1.
- Select "Start".
- Follow the instructions on the screen to complete the calibration.
- If no error occurs, the calibration was completed successfully.