Turntable Bearing Mounting Bolt Condition Check - JLG 1850SJ Service And Maintenance Manual

SECTION 3 - CHASSIS & TURNTABLE
5. Apply JLG Thread locking compound P/N 0100019 to
the bolts. Pre-torque the five bolts to 45 ft-lb (6 kgm).
6. Tighten setscrew until pinion is completely snug against
shim and bearing. Back off setscrew.
7. Torque setscrew to 50 ft-lb (7 kgm).
8. Apply JLG Thread locking compound P/N 0100019.
Tighten jam nut.
9. Torque bolts to 340 ft-lb (47 kgm).
3-38
10. Discard shim.
11. Rotate bearing high spot 15° to the second drive hub.
Repeat procedure.
Turntable Bearing Mounting Bolt Condition
Check
THE SWING BEARING IS ONE OF THE MOST CRITICAL POINTS ON AN AERIAL
LIFT. IT IS HERE THAT THE STRESSES OF LIFTING ARE CONCENTRATED, AT THE
CENTER OF ROTATION. BECAUSE OF THIS, PROPER MAINTENANCE OF THE
SWING BEARING BOLTS IS A MUST FOR SAFE OPERATION.
NOTE: This check is designed to replace the existing bearing 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
applying loctite #271 to the bolt threads. 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. See Position 2, Figure
3-39.
b. At the position indicated on Figure 3-39., try to
insert a 0.0015" feeler gauge between the bolt and
hardened washer at the arrow indicated position.
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