TM 5-3810-306-34
c. Locate maximum eccentricity point on bearing
accomplished every 500 hours
and lift and install bearing with this point in mesh
thereafter, ensuring the bolts are
with drive pinion.
properly torqued.
d. Install twenty-four new grade 8 bolts (2) and
NOTE
washers (3). Remove washers, if undamaged or
deformed, may be reused.
Any bearing bolt found to be
loose or that has been removed
2. TORQUE BOLTS (2) ON SWING BEARING OUTER
from the bearing for any reason
RACE.
shall be replaced with a new bolt,
nut and hardened washers. The
a. General.
new bolt, nut and washer
assembly must be properly
WARNING
torqued before putting the unit
back into service. A bearing bolt
Failure to maintain proper torque
that continually maintains its
of the turntable bearing attaching
proper torque never has to be
bolts will result in damage to the
replaced With this in mind, it
crane and possible injury to
should not be necessary to
personnel.
Maintaining proper
replace all swing bearing bolts
torque values for bolts is
after
every
500
hours
of
extremely important for structural
operation, but rather, only those
strength,
performance,
and
that are found to be loose.
reliability of crane. Variations in
torque can cause distortion,
WARNING
binding, or complete separation
of the superstructure from the
KNOW YOUR TORQUE WRENCH!
carrier.
Flexible beam type wrenches,
even though they might have a
CAUTION
pre-set feature must be pulled at
right angles and force must be
Repeated retorquing may cause
applied at center of handle. Force
bolts to stretch. If bolts keep
value readings must be made
working loose, they must be
while tool is in motion. Rigid
replaced with new bolts and nuts
handle type, with torque limiting
of the proper grade and size.
devices that can be pre-set to
required values, eliminate dial
WARNING
readings and provide more
It is mandatory that bearing
reliable, less variable readings.
attaching bolts be inspected for
lack of torque and retorqued, as
NOTE
required, after the first 300 hours
If multipliers and/or special tools
of crane operation. The bolts
are used to reach hard to get at
may loosen in service due to
areas, ensure torque readings are
vibration,
shock-loads,
and
accurate.
temperature changes. Therefore,
periodic inspection should be
Change 1 15-145
