5-65
MAINTENANCE
9. Remove the cap (B), install the connector
(C), and then drain the hydraulic oil. (The
oil comes out once the screw is
tightened.)
10. Loosen the bolts and remove the flange
(7).
11. Remove the suction strainer (8) and
clean it.
12. Clean the inside of the hydraulic oil tank.
13. Remove the connector (C) and install the
cap (B).
14. Install the suction strainer (8) on the tank
and then install the flange (7).
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.
EVERY 4000 HOURS
1. Open the engine hood.
2. Loosen the drain hose (1) and (2) of the
hydraulic pump.
3. Tighten the drain hose (1) and (2) once
there are no more air bubbles coming from
the elbow (3) and (4) joint.
• Slew motor
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. Loosen the air-bleeding plug (1).
2. Tighten the plug (1) once the hydraulic oil
overflows from the air-bleeding plug hole
(1).
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