Transmission; Travel Reduction Gear - Hitachi Zaxis 33U-5A Operator's Manual

C. Transmission

Travel Reduction Gear

Check Oil Level --- every 500 hours
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 7-7 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.
5. Remove air release plug (1) and oil level check plug (2).
Oil must be up to the bottom of hole.
6. If necessary, add oil until oil flows out of oil level check
plug (2) hole. (See gear oil chart)
7. Clean and install air release plug (1) and oil level check
plug (2).
Model
Plug (1)
ZX33U-5A,
38U-5A
Plug (2)
ZX48U-5A, Plug (1)
55U-5A,
65USB-5A Plug (2)
8. Check the gear oil level in the other travel reduction
gear.
MAINTENANCE
Tightening Torque
46 to 51 N∙m (4.6 to 5.1 kgf∙m,
33 to 36 lbf∙ft)
12 to 18 N∙m (1.2 to 1.8 kgf∙m,
9 to 13 lbf∙ft)
22 to 24 N∙m (2.2 to 2.4 kgf∙m,
16 to 17 lbf∙ft)
7-28
1
2
3
M503-07-015
M585-07-080
1
2
3