Hitachi ZAXIS 30U-5N Operator's Manual page 209

Change Gear Oil --- every 1000 hours
IMPORTANT: Do not use gear oils other than those listed
in the "Brand Names of Recommended Transmission
Oil".
1. Park the machine on a level surface.
2. Rotate the travel motor until the plugs are positioned as
illustrated on the right.
3. Park the machine following the same procedures as
described on page 7-6 for preparation for inspection and
maintenance.
d
WARNING: Keep body and face away from the air
release plug. Gear oil may be hot just after operation.
Wait for gear oil to cool and then gradually loosen the
air release plug to release pressure.
4. After gear oil has cooled, slowly loosen air release plug
(1) to release pressure, and temporarily retighten plug
(1).
5. Remove drain plug (3) and plug (1), in that order, to drain
oil.
6. Clean drain plug (3). Tighten plug (3).
Model
ZX30U-5N, 35U-5N
ZX50U-5N, 60USB-5N
MAINTENANCE
Tightening Torque
46 to 51 N·m (4.6 to 5.1 kgf·m,
33 to 36 lbf·ft)
22 to 24 N·m (2.2 to 2.4 kgf·m,
16 to 17 lbf·ft)
7-29
1
2
3
M585-07-080