Replace Air Breather Element - Hitachi ZW 550-6 Operator's Manual

Replace Air Breather Element

--- every 2000 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.
Replacement Procedures
1. Park the machine following the same procedures as
described on page 7-6 for preparation of inspection/
maintenance work.
2. Before replacing the filter element, be sure to relieve
the air pressure from the hydraulic oil tank by
pressing air bleed valve (1).
3. Remove cap (2) and remove nut (3) by rotating it
counterclockwise.
4. Rotate cover (4) counterclockwise and remove it.
Remove element (5).
5. Install new element (5). Tighten cover (4) clockwise.
After cover (4) comes in contact with the inside
element, tighten the cover 1/4 turn further.
6. Install and tighten nut (3). Install cap (2).
m (3) : 8~10 N·m (0.8~1.0 kgf·m, 6~7.4 lbf·ft)
7. Take care not to allow water or dust to enter the
clearance (air discharge port) between cover (4) and
body (6).
f
NOTE: Replace the element at the recommended regular
intervals to keep the hydraulic oil clean and to extend the
service life of the hydraulic equipment.
MAINTENANCE
7-50
1
115Z7-7-37-1
2
3
4
5
6
T4A breather valve