5-67
MAINTENANCE
15. Tighten the drain plug (7).
16. Add hydraulic oil from the hole of plug (3)
up to the level between the upper limit
(H) and the lower limit (L) in the sight
gauge (1).
17. Tighten the plug (3).
18. Bleed air from the hydraulic oil circuit
following “Bleeding air” below.
19. Set the machine to the hydraulic oil level
inspection posture and inspect the oil
level after the oil cools.
Refer to “Inspecting the hydraulic oil tank
level and replenishing” on page 5-24.
20. Tighten the under cover (6).
EVERY 4000 HOURS
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.
• Hydraulic pump
1. Open the engine hood.
2. Loosen the vent plug (1) on the hydraulic
pump.
3. Once hydraulic oil overflows from the vent
plug hole (1), tighten the vent plug (1).
If the boom or arm does not move normally,
air may be present in the following locations.
This operation is dangerous and requires
experience. Ask your sales or service dealer
for help.
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