Grove Published 01-29-2015, Control # 512-01 6-9
TMS700E SERVICE MANUAL SWING SYSTEM
Torquing Turntable Bolts
General
Maintaining proper torque value for bolts is extremely
important for structural strength, performance, and reliability
of the crane. Variations in torque can cause distortion,
binding, or complete separation of the superstructure from
the carrier.
Proper identification of bolt grade is important. When marked
as a high strength bolt (grade 8), the serviceman must be
aware of bolt classifications and that he is installing a high
strength heat-treated tempered component and the bolt
must be installed according to specifications. Special
attention should be given to the existence of lubricant and
plating that will cause variation from dry torque values. When
a high strength bolt is removed, or un-torqued, the bolt must
be replaced with a new bolt of the same classification.
KNOW YOUR TORQUE WRENCH! Refer to Torque
Wrenches, page 1-12 for more information.
DANGER
Failure to maintain proper torque of the turntable bearing
attaching bolts will result in damage to the crane and
possible injury to personnel.
CAUTION
Repeated re-torquing may cause bolts to stretch. If bolts
keep working loose, they must be replaced with new bolts
of the proper grade and size.
DANGER
It is mandatory that bearing attaching bolts be inspected
for lack of torque and retorqued, as required, after the first
300 hours of crane operation. The bolts may loosen in
service due to vibration, shock-loads, and temperature
changes, therefore, periodic inspection should be
accomplished every 500 hours thereafter, ensuring the
bolts are properly torqued.
Reference Only
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