Hitachi ZW 370-6 Operator's Manual page 340

[Line Filter in Joystick Steering (Option)]
1. Remove adapter (2) and filter (3) from valve (1), and
clean filter (3) by blowing compressed air or cleaning
solution from the oil flow outlet side.
2. Install the cleaned filter (3) with new O-ring (4), and
tighten adapter (2).
3. After cleaning the filter, bleed air from the hydraulic
pump and check the oil level in the hydraulic oil tank.
(Refer to the descriptions for "Bleed air from the
hydraulic system" in item 2 .)
If the machine is operated without bleeding the air
mixed in the hydraulic circuit, damage to the hydraulic
pump may result.
f
NOTE: Clean the element at the regular intervals to
maintain clean hydraulic oil and extend the service life of
the hydraulic components.
MAINTENANCE
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