Change Hydraulic Oil - Hitachi ZW 550-6 Operator's Manual

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: Do not use hydraulic oils other than
listed in the "Recommended 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. 500 liters (130
gallons).
Remove drain plugs (7) from 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)
f
NOTE: Make sure to replace the cover gasket with new
one.
6. Install drain plugs (7).
MAINTENANCE
7-44
4
7 1
2
2
3
5
MNHE-07-005
3
115Z7-7-37-1
MNHG-07-004