Manitowoc MLC300 Service And Maintenance Manual

Reference Only
UNDERCARRIAGE MLC300 SERVICE/MAINTENANCE MANUAL
8-20
Published 11-22-17, Control # 257-02
TIGHTENING TURNTABLE BEARING BOLT
See Figure 8-10 for the following procedures.
After First 50 Hours of Operation
Tighten all bolts, three at a time, in the numbered sequence
given to 3 525 Nm (2,600 ft-lb).
Annually or Every 2,000 Hours of Operation
(whichever comes first)
Tighten all bolts, three at a time, in the numbered sequence
given using two steps:
• First to 1 360 Nm (1,000 ft-lb)
• Final to 3 525 Nm (2,600 ft-lb)
If during the annual interval:
• One or more bolts are found to be tightened to less than
2 820 Nm (2,080 ft-lb), replace each loose bolt and
washer as well as one bolt and washer on each side of
each loose bolt.
• 17 or more bolts in either ring are found to be tightened
to less than 2 820 Nm (2,080 ft-lb), replace all of the
bolts and washers for the corresponding ring.
• Replace all of the bolts and washers anytime a new
turntable bearing is installed.
REPLACING TURNTABLE BOLTS
1. Apply Never-Seez or an equivalent anti-seizing lubricant
to:
• Bolt threads
• Underside of bolt heads
• Both sides of all washers
2. Make sure the chamfer (E) in each washer is toward the
bolt head (see View A).
3. Install and tighten the bolts, three at a time, in the
numbered sequence to an initial torque of 1 360 Nm
(1,000 ft-lb).
4. Tighten the bolts, three at a time, in the numbered
sequence to a final torque of 3 525 Nm (2,600 ft-lb).
DANGER
Crushing Injury Hazard!
Two people are required to install the turntable bearing
bolts, an operator to operate the swing control and a
mechanic to tighten the bolts to the correct torque.
It is necessary for the mechanic to go inside the rotating
bed to tighten the inner turntable bearing bolts, requiring
the following to be complied with:
• Maintain constant communication between the
operator and the mechanic while the mechanic is
inside the rotating bed.
• The operator shall not swing the upperworks until
instructed to do so by the mechanic.
• The mechanic shall stay well clear of moving parts
while the upperworks is being swung to position the
bolts.
WARNING
Bolt Failure!
Loose or improperly tightened bolts can cause the bolts or
the turntable bearing to fail, possibly allowing the
upperworks to break away from the carbody.

Manitowoc MLC300 Specifications

General

Brand	Manitowoc
Model	MLC300
Category	Construction Equipment
Language	English