Manitowoc 18000, Service Maintenance Manual, Page: 267 / 316

Reference
Only
Manitowoc
Published 12-05-17, Control # 035-23
8-1
18000 SERIVCE/MAINTENANCE MANUAL UNDER CARRIAGE
8
SECTION 8
UNDER CARRIAGE
TURNTABLE BEARING BOLT TORQUE
Torque Requirements
Lubrication
Before installing the turntable bearing bolts, lubricate the
threads of each bolt and both sides of each washer with
“Never-Seez” (MCC No. 361010) or an equivalent
antiseizing lubricant.
Torque Values
Torque each turntable bearing bolt to 6,600 ft-lb (8 948 Nm).
When new bolts are installed, torque the bolts in two steps:
first to 2,200 ft-lb (2 983 Nm) and then to 6,600 ft-lb (8 948
Nm).
Torque Sequence
Torque the bolts (two at a time in most cases) in the
numbered sequence given in
Figure 8-1 (one ring at a time).
Torque Intervals
Initial operation: torque all bolts to the specified value after
the first 50 hours of operation.
Yearly or every 2,000 hours of operation (whichever comes
first): torque all bolts to the specified value.
Bolt Replacement
NOTE: Always replace the washer when replacing a bolt.
If at the yearly inspection interval, one or more bolts are
found to be torqued to less than 5,280 ft-lb (7 159 Nm),
replace each loose bolt. Also replace the bolt and washer on
each side of each loose bolt.
If at the yearly inspection interval 17 or more bolts in either
ring are found to be torqued to less than 5,280 ft-lb (7 159
N m ) , r ep l ac e al l o f t he b ol ts a n d wa s he r s f or t he
corresponding ring.
Replace all bolts and washers each time a new turntable
bearing is installed.
DANGER
Crushing Injury Hazard!
Two people are required to torque turntable bearing bolts:
an operator to operate swing control and a mechanic to
torque bolts.
Mechanic must go inside carbody to torque inner turntable
bearing bolts.
• Maintain constant communication between operator
and mechanic while mechanic is inside carbody.
• Operator, do not swing upperworks until instructed to
do so by mechanic.
Mechanic, stay well clear of moving parts while upper is
being swung to position bolts.
WARNING
Bolt Failure!
Loose or improperly torqued bolts can cause bolts or
turntable bearing to fail, possibly allowing upperworks to
break away from carbody.