3.14 Swing Bearing; Turntable Bearing Mounting Bolt Condition Check - JLG t350 Service And Maintenance Manual

3.14 SWING BEARING

Turntable Bearing Mounting Bolt Condition
Check
NOTE: This check is designed to replace the existing bear-
ing bolt torque checks on JLG Lifts in service. This
check must be performed after the first 50 hours of
machine operation and every 600 hours of machine
operation thereafter. If during this check any bolts
are found to be missing or loose, replace missing or
loose bolts with new bolts and torque to the value
specified in the torque chart, after lubricating the bolt
threads with loctite #271. After replacing and
retorquing bolt or bolts recheck all existing bolts for
looseness.
1. Check the frame to bearing attach bolts as follows:
a. Fully elevate the main boom.
b. Try to insert a 0.0015" (0.038 mm) feeler gauge
between the bolt and hardened washer at the
arrow indicated position.
3121198
SECTION 3 - CHASSIS & TURNTABLE
Figure 3-15. Swing Bolt Feeler Gauge Check
c. Ensure that the 0.0015" (0.038 mm) feeler gauge
will not penetrate under the bolt head to the bolt
shank.
d. Swing the turntable 90 degrees, and check
some selected bolts at the new position.
e. Continue rotating the turntable at 90 degrees
intervals until a sampling of bolts have been
checked in all quadrants.
2. Check the turntable to bearing Attach bolts as fol-
lows:
a. Elevate the fully retracted main boom to full ele-
vation.
b. Try to insert the 0.0015" (0.038 mm) feeler gauge
between the bolt head and hardened washer at
the unloaded side of the turntable bearing.
c. Lower the boom to horizontal and fully extend
the boom.
d. Try and insert the 0.0015" (0.038 mm) feeler
gauge between the bolt head and hardened
washer at the unloaded side of the turntable
bearing.
– JLG Lift – 3-51