5-54
MAINTENANCE
15. Install the new return filter (5) and the
flange (4) on the tank.
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 5-22.
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
EVERY 4000 HOURS
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).
• Cylinders
1. Start the engine, let it run at a low-idling
speed for 10 minutes.
2. Maintain the engine at low idle, and then
slowly extend and retract each cylinder 4
or 5 times, without letting them reach the
stroke end.
3. While running the engine at high speed,
slowly extend and retract each cylinder 4
or 5 times, without letting them reach the
stroke end.
4. Return the engine speed to low idle, and
then slowly extend and retract each
cylinder 4 or 5 times to the stroke end.
1
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