SECTION 2 - PROCEDURES
2-38
– JLG Lift –
3120743
2.16 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 torqu-
ing bolt or bolts recheck all existing bolts for loose-
ness.
1.
Check the frame to bearing. Attach bolts as follows:
a. Elevate the fully retracted boom to 70 degrees
(full elevation).
b. At the positions indicated on Figure 2-30. try and
insert the.0015" feeler gauge between the bolt
head and hardened washer at the arrow indi-
cated position.
c. Assure that the.0015" feeler gauge will not pene-
trate 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 boom to 70 degrees
(full elevation).
b. At the positions indicated on Figure 2-30. try and
insert the.0015" feeler gauge between the bolt
head and hardened washer at the arrow indi-
cated position.
c. Lower the boom to horizontal and fully extend
the boom.
d. At the position indicated on Figure 2-30. try and
insert the.0015" feeler gauge between the bolt
head and hardened washer at the arrow indi-
cated position.
Wear Tolerance.
1.
30 electric - With the boom positioned over the side
of the machine, the Upper Boom fully elevated and
Lower Boom stowed, (See Figure 2-31 a.), using a
magnetic base dial indicator, measure and record
the distance between the swing bearing and turnta-
ble. (See Figure 2-32.)
35/n35 electric - With the boom positioned over the
side of the machine, the Upper Boom horizontal with
telescope fully extended and Lower Boom fully ele-
vated, (See Figure 2-31 a.), using a magnetic base
dial indicator, measure and record the distance
between the swing bearing and turntable. (See Fig-
ure 2-32.)
40/n40/45 electric - With the boom positioned over
the side of the machine, the Upper Boom horizontal
with telescope fully extended and Mid/Lower Boom
stowed, (See Figure 2-31 a.), using a magnetic base
dial indicator, measure and record the distance
between the swing bearing and turntable. (See Fig-
ure 2-32.)
2.
30 electric - At the same point, with the boom posi-
tioned over the side of the machine, the Upper
Boom horizontal and the Lower Boom fully elevated,
(See Figure 2-31 b.) using a magnetic base dial indi-
cator, measure and record the distance between the
swing bearing and turntable (See Figure 2-32).
Figure 2-30. Swing Bearing Feeler Gauge Check.
Property of American Airlines
