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Change Hydraulic Oil
--- every 4000 hours
d
WARNING: Hydraulic oil becomes hot during
operation. Severe burns may result if skin comes
in contact with hot hydraulic oil. Wait for the oil to
cool before starting any maintenance work. Release
trapped hydraulic circuit pressure by using the
loader control levers.
IMPORTANT: When changing hydraulic oil, take care
not to permit foreign matters such as dirt, water,
and /or sand to enter into the hydraulic oil tank.
IMPORTANT: Do not use hydraulic oils other than
listed in the "Hydraulic Oil".
1. Park the machine and stop the engine following
the same procedures as described on page 7-7 for
preparation of inspection/maintenance work.
2. Install articulation stopper (lock bar) (1) to the front
and rear of the chassis by following the procedures
described on page 7-9.
3. Before changing the hydraulic oil, be sure to relieve
the air pressure from the hydraulic oil tank (4) by
pressing air bleed valve (2).
4. Remove air bleed valve (2).
Arrange a container of approx 200 liters (53 gallons).
Remove drain plug (7) to drain tank (4).
Drain plug width across flat: 24 mm (0.95 in)
5. Remove cleaning cover (5) on the side of hydraulic oil
tank (4). Clean the tank bottom with cleaning oil.
Clean the suction filter inside (refer to the following
section.)
Install the cover and a new gasket to the original
position after cleaning out tank.
Cover (5) mounting nut:
Width across flat:
17 mm (0.67 in)
Tightening torque: 38 N·m (3.9 kgf·m, 28 lbf·ft)
f
NOTE: Make sure to replace the cover gasket with new
one.
MAINTENANCE
7-45
90Z7-7-35
90Z7-7-40-2
T4A breather valve2
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Troubleshooting
