5-44
MAINTENANCE
7. Place a pan for catching the waste oil
under the drain plug (6).
8. Loosen the drain plug (6) and drain the
hydraulic oil.
9. Loosen the bolts and remove the flange (7).
10. Remove the suction strainer (8) and
clean it.
11. Clean the inside of the hydraulic oil tank.
12. Replace the return filter (3).
Refer to “Replacing the hydraulic oil
return filter” on page 5-25.
13. Replace the air breather (5) (if equipped).
Refer to “Replacing the air breather (If
equipped)” on page 5-41
EVERY 2000 HOURS
14. Install the suction strainer (8).
15. Install the flange (7).
16. Tighten the drain plug (6).
17. Add hydraulic oil from the hole of plug (2)
up to the midpoint of the sight gauge (1).
18. Tighten the plug (2).
19. Bleed air from the hydraulic oil circuit
following “Bleeding air” below.
20. Set the machine to the hydraulic oil level
inspection posture and inspect the oil
level when the oil temperature drops.
Refer to “Inspecting the hydraulic oil tank
level and replenishing” on page 5-19.
21. Pressurize the hydraulic oil tank.
(If not equipped with the air breather)
Refer to “Pressurizing the hydraulic oil
tank” on page 5-20.
Note: For a machine equipped with the air
breather, no pressurization is necessary.
Bleeding air
IMPORTANT: After replacing the hydraulic
oil or hydraulic devices, or after
performing maintenance of the hydraulic
devices, bleed air from the hydraulic
circuits and hydraulic devices. Failure to
do so may damage the hydraulic devices.
• Cylinders
1. Start the engine, let it run at a low-idling
speed for 10 minutes.
2. Maintain the engine at low idle, then
extend and retract each cylinder 4 or 5
times, without let them reach the stroke
end.
3. Run the engine at high speed, then extend
and retract each cylinder 4 or 5 times,
without let them reach the stroke end.
4. Set the engine back to a low idle, then
extend and contract all the cylinders 4 or 5
times to the stroke ends.
To Next Page
Loading...
Need help?
General
