4.8 Service procedure Every 1000 hours service Maintenance Replace HST oil filter element z The parts and oil are at high temperature after the engine is stopped, and may cause burns. Wait for the temperature to go down before starting the work. z When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it. 1. Remove cover (1). GK032289 1 2. Using a filter wrench, turn filter cartridge (2) to the left to remove it. 3. Install the new filter cartridge. When the packing surface comes in contact with the seal surface of the filter holder, tighten a further 1/2 turns. 2 4. Run the engine at low idling for 5 minutes to bleed the air from the HST circuit. 5.
Check that the hydraulic oil is at the specified level. For details, see "Check oil level in hydraulic tank, add oil (4-42)". GK032290 6. Run the engine at low idling, and extend and retract the steering, bucket, and lift arm cylinders 4 to 5 times. Be care- ful not to operate the cylinder to the end of its stroke (stop approx.100 mm (3.9 in) before the end of stroke). NOTE If the engine is run immediately at high speed or the cylin- der is operated to the end of its stroke, the air inside the cyl- inder will cause damage to the piston packing. 7.
Next, operate the steering, bucket, and lift arm cylinders to the end of their stroke 3 to 4 times, then stop the engine and loosen fillercap to bleed the air from the hydraulic tank. 8. Check that the hydraulic oil is at the specified level. For details, see "Check oil level in hydraulic tank, add oil (4-42)". 9. After completing the air bleed operation, install cover (1). Replace the HST filter element if the HST oil filter clogging warn- ing pilot lamp lights up, even if 1000 hours or 1 year has not passed. 4-58 WA150-5H – VEAM934100 WARNING WARNING