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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, "Prepare the Machine for Maintenance".
Reference: Refer to the Testing and Adjusting, "Hydraulic System Air - Purge"
When the main pumps have been serviced or the hydraulic oil has been replaced, remove the air from the hydraulic system. Remove the air with the following procedure.
Note: Make no attempt to start the engine until the pump has been filled with hydraulic oil. Serious damage to the hydraulic components can result.
- Position the machine on level ground in the service position.
- Stop the engine.
- Slowly loosen the pressure cap on the top of the hydraulic tank.
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Illustration 1 g06374599 Standard machines Show/hide table
Illustration 2 g06374596 Machines with high-flow Aux pump - Slowly loosen the vent plug on the top of the hydraulic pump. (or plug from tee on high-flow machines)
- Leave the plug loose until hydraulic oil starts to flows out of the plug. This indicates that the air has been released from the hydraulic system.
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Table 1 Vent Plug Torque Sales Model 307.5, 308, 308.5, and 309 310 Specification 60 ± 10 N·m (44 ± 7 lb ft) 220 ± 20 N·m (162 ± 7 lb ft) - Install the vent plug and tighten to the value listed in Table 1.
- If necessary, add hydraulic oil through the opening for the pressure cap.
- Tighten the pressure cap securely.
