Manitowoc 777 Service And Maintenance Manual

Reference Only
Manitowoc Published 10-01-2012, Control # 045-08 8-1
777 SERVICE MANUAL UNDER CARRIAGE
8
SECTION 8
UNDER CARRIAGE
TURNTABLE BEARING BOLT TORQUE
Bearing Installation
A dowel pin is installed in the inner ring as show in
Figure 8-1, View B-B. Use the pin to align the inner ring with
the rotating bed.
Torque Requirements
Lubrication
Before installing the turntable bearing bolts, lubricate the
threads of each bolt with Never-Seez (MCC No. 361010) or
an equivalent antiseizing lubricant.
Torque Values
Torque each turntable bearing bolt to 1,300 ft-lb (1 763 Nm).
When new bolts are installed, torque the bolts in two steps:
first to 450 ft-lb (610 Nm) and then to 1,300 ft-lb (1 763 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
If at the yearly inspection interval, one or more bolts are
found to be torqued to less than 1,040 ft-lb (1 410 Nm),
replace each loose bolt and washer. Also replace the bolt
and washer on each side of each loose bolt.
If at the yearly inspection interval ten or more outer ring bolts
or twelve or more inner ring bolts are found to be torqued to
less than 1,040 ft-lb (1 410 Nm), replace all of the bolts and
washers for the corresponding ring.
Replace all bolts and washers each time a new turntable
bearing is installed.
CAUTION
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 rotating bed until instructed to
do so by mechanic.
Mechanic, stay well clear of moving parts while upper is
being swung to position bolts in access holes.
WARNING
Bolt Failure!
Loose or improperly torqued bolts cause bolts or turntable
bearing to fail, possibly allowing rotating bed to break
away from carbody.

Manitowoc 777 Specifications

General

Brand	Manitowoc
Model	777
Category	Construction Equipment
Language	English