Replace Pump Drain Filter - Hitachi Zaxis 850LC-3 Operator's Manual

Replace Pump Drain Filter

6
--- every 1000 hours
WARNING: Hydraulic oil may be hot just ater opera-
tion. Be sure to wait for oil to cool before starting
work.
1. Park the machine on a level surface.
2. Lower the bucket to the ground.
3. Turn the auto-idle switch off.
IMPORTANT: The turbocharger may be damaged if the en-
gine is not properly shut down.
4. Run the engine at slow idle speed without load for five
minutes.
5. Stop the engine. Remove the key from the key switch.
6. Operate the right and left control levers to release pres-
sure from the pilot accumulator.
7. Pull the pilot control shut-off lever to the LOCK position.
8. Leave the machine for a while after stopping operation.
After the oil temperature is cooled, push air bleed valve (1)
to bleed air from the hydraulic oil tank.
9. Remove filter cartridge (2) by turning it counterclockwise
with filter wrench.
10. Clean the filter gasket contact area.
11. Apply a thin film of clean oil to the gasket of new filter.
12. Install the new filter. Turn filter cartridge clockwise by
hand until gasket touches contact area. Be sure not to
damage gasket when installing filter.
13. Tighten filter cartridge (2) 1/2 turn more using wrench.
14. Start the engine. Check for any leakage.
15. After replacing the filter element, bleed air from the
pump and check the oil level in the hydraulic oil tank.
(Refer to the Bleed Air from Hydraulic System in Step 3.) If
the machine is operated with air remaining in the hydrau-
lic system, damage to the hydraulic pump may result.
16. Replace the element at the regular interval to keep
hydraulic oil clean and to extend the life of the hydraulic
components.
MAINTENANCE
7-38
W1JB-02-03-006
1
M1J1-07-006
2
M1JB-07-042