Replace Full-Flow Filter - Hitachi Zaxis 33U-5A Operator's Manual

Replace Full-Flow Filter

--- every 500 hours (first time after 250 hours)
(when using the filter-paper element)
--- every 1000 hours (first time after 500 hours)
(when using the high performance element)
IMPORTANT: Changing interval differs according to the
brand of hydraulic oil, filter element and attachments
used, kind of filter element or average attachment
operating availability. (Refer to 7-33, 7-34 pages)
d
CAUTION: Hydraulic oil becomes hot and pressurized
during operation. Severe burns may result if
skin comes in contact with escaping hydraulic oil
immediately after operation. Wait for the oil to cool
before starting any maintenance work.
Procedures:
1. Park the machine following the same procedures as
described on page 7-7 for preparation for inspection and
maintenance.
2. Before replacing element (6), be sure to bleed air
pressure from the hydraulic oil tank by loosening cap (7).
3. Loosen bolts (1) (4 used) to remove cover (2) and O-ring
(3). When removing cover (2), slowly remove cover (2)
while pressing cover (2) downward so that spring (4)
does not fly off.
IMPORTANT: Especially when removing the filter, be
aware that the remaining oil in the filter may spill. Use
extra care.
4. Remove spring (4), valve (5) and element (6).
5. Take extra care never to allow water or dust to enter the
filter case.
MAINTENANCE
7
7-41
1 2 3
4
5
6
M1M7-05-024
MADB-00-018
MADB-07-017