Clean Pilot Oil Filter - Hitachi ZW 550-6 Operator's Manual

Clean Pilot Oil Filter

--- every 2000 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.
IMPORTANT: Remove trapped hydraulic circuit
pressure by using the loader control levers.
1. Park the machine following the same procedures as
described on page 7-6 for preparation of inspection/
maintenance work.
2. Install articulation stopper (lock bar) to the front
and rear of the chassis by following the procedures
described on page 7-8.
3. Before removing the filter element, be sure to relieve
the air pressure from the hydraulic oil tank by pressing
air bleed valve (1).
[ Line Filter in Steering Circuit (Reducing Valve Unit (2)) ]
4. Remove plug (4) with O-ring (5).
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WARNING: Be sure to wear safety glasses when
cleaning the air breather with compressed air [less
than 0.2 MPa (2 kgf/cm2)].
5. Take out filter element (3) inside using a screwdriver
(-), and clean it by applying air or cleaning solution
from the oil flow outlet side.
6. Install the cleaned filter, O-ring and tighten plug (4).
MAINTENANCE
95Z7-7-43-4
7-47
1
115Z7-7-37-1
2
115Z7-7-49-2
Oil Flow
90Z7-38511-31770