Hitachi ZW 370-6 Operator's Manual page 326

13. Using a filter wrench, turn cartridge filter (11)
counterclockwise to remove it. Properly dispose of the
oil and filter.
14. Clean the filter-seating surface. After coating the new
cartridge filter gasket surface with new oil, lightly turn
the cartridge filter clockwise by hand until the cartridge
filter sealing surface comes in contact with the filter-
seating surface.
15. Install filter (11) on the filter head. Turn it clockwise to
tighten. Follow the instruction on the filter.
m : 30~40 N·m (3.0~4.0 kgf·m) (22.0~29.5 lbf·ft)
16. Refill the specified amount of oil through transmission
oil filler port (12).
70 liters (18.5 gallons)
17. Start the engine and keep it running for two minutes.
18. Check that the oil level is within the specified range in
oil level gauge (13). Refill as necessary.
f
NOTE:
 Never reuse cartridge type element (11).
 Install the cartridge with care so that the O-ring is not
damaged due to twisting.
 Check for any oil leakage at the drain plug and the filter
mounting area.
MAINTENANCE
7-32
12
13
95Z7-7-32-1
95Z7B-7-30-1