Replace Swing Drain Filter Element - Hitachi ZAXIS 70 Operator's Manual

Replace Swing Drain Filter Element

--- every 4 000 hours
CAUTION: Hot hydraulic oil may spout immedi-
ately after operation, possibly causing severe
burns. Be sure to wait for the oil and components
to cool before starting any maintenance and in-
spection work.
1. Park the machine on solid and level ground with the
bucket cylinder fully extended, the arm cylinder fully
retracted, and the bucket and the blade (optional)
lowered to the ground as illustrated to the right. Stop
the engine.
2. Be sure to bleed air from the hydraulic oil tank by
pressing the air vent valve on the top of the hydraulic
oil tank before replacing the element.
3. Using a filter wrench, turn cartridge type element (1)
(swing drain filter) counterclockwise to remove the
element.
4. Coat a new cartridge gasket with hydraulic oil. Turn
the cartridge clockwise until the gasket comes in con-
tact with the sealing surface.
5. Tighten the cartridge further by 1-1/4 turns using the
filter wrench. Take care not to overly tighten the car-
tridge.
Tightening Torque: 8.0 to 10.0 N·m (0.8 to 1 kgf·m)
6. Always beware not to allow water and/or dust to enter
the filter.
7. After replacing the filter, bleed air from the pump and
check the oil level in the hydraulic oil tank. (Refer to
the description on "Bleed Air from Hydraulic System"
in (3).) If the machine is operated with air mixed in
the circuit, damage to the pump may result.
8. Replace the elements at the regular intervals to
maintain the cleanliness of hydraulic oil and to extend
the service life of the hydraulic components.
MAINTENANCE
7-35
1
ZAXIS70, 70LC, 80SB, 80SBLC, 80LCK
1
ZAXIS85US
M1CC-07-002
M1CD-07-016
M1CG-07-011