Change Hydraulic Oil - Hitachi ZW 370-6 Operator's Manual

Change Hydraulic Oil

--- every 4000 hours
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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: 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 7-6 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 7-8.
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).
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.
4. Remove air bleed valve (2).
Arrange a container of approx. 300 liters (80 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. Install
the cover and a new gasket to the original position after
cleaning out tank.
Cover mounting nut width across flat: 14 mm (0.55 in)
Nut tightening torque: 38 N·m (28 lbf·ft)
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NOTE: Make sure to replace the cover gasket with new one.
MAINTENANCE
7-41
5
7 4
1
2
3
95Z7B-7-8-2
95Z7B-7-42-2
T4A breather valve2