Check Wheel Bolt Torque - Hitachi ZW 120-6 Operator's Manual

Check Wheel Bolt Torque

--- every 500 hours (50 hours at first time only)
Be sure to check the wheel bolt torque by turning the bolt in
the tightening direction.
Tightening torque: 890 N·m (89 kgf·m, 660 lbf·ft)
Replace Tire
d
WARNING: Secure the front and rear frames with the
articulation lock bar and pins.
IMPORTANT:
 Clean the area around wheel bolts before starting
work on them.
 When tightening with an impact wrench, pay
attention to the time it takes to tighten, air pressure,
etc., to avoid overtightening. Use a torque wrench
for final tightening and tighten to the specified
torque.
 Height of the machine may change according to the
types of tires to be installed.
Do not change the specifications of the registered
machine by using unauthorized tire sizes.
1. Park the machine following the same procedures as
described on page 7-7 for preparation of inspection/
maintenance work.
2. Install articulation lock bar to the front and rear of the
frame by following the procedures described on page
7-9.
3. Loosen all wheel bolts one turn.
Note which way the tread pattern is facing.
4. After jacking up the machine, securely support the
machine with blocks.
5. Remove the wheel bolts. Replace the tire.
6. With the tire raised off the ground, lightly tighten the
wheel bolts in order as illustrated to the right.
7. Lower the machine. Retighten the wheel bolts to
specification in the order as illustrated to the right.
MAINTENANCE
7-84
(Right) (Wrong)
Front
M4GB-07-104
M4FC-07-051