JLG 460SJ Service Manual - Manual (Page 97)

SECTION 3 - CHASSIS & TURNTABLE
3120895 – JLG Lift – 3-45
Check the turntable to bearing. Attach bolts as follows:
1. Elevate the fully retracted boom to full elevation and
rotate the platform 90 o .
2. Swing the turntable over the side.
3. At turntable rear, try and insert the 0.0015" feeler
gauge between the bolt head and hardened washer
at the arrow indicated position.
4. Assure that the 0.0015" feeler gauge will not pene-
trate under the bolt head to the bolt shank.
5. Swing the turntable 90 degrees, and check some
selected bolts at the new position.
6. Continue rotating the turntable at 90 degrees inter-
vals until a sampling of bolts have been checked in
all quadrants.
.
7. Lower the boom to horizontal and fully extend the
boom.
8. At turntable front, try and insert the 0.0015" feeler
gauge between the bolt head and hardened washer
at the arrow indicated position.
9. Assure that the 0.0015" feeler gauge will not pene-
trate under the bolt head to the bolt shank.
10. Swing the turntable 90 degrees, and check some
selected bolts at the new position.
11. Continue rotating the turntable at 90 degrees inter-
vals until a sampling of bolts have been checked in
all quadrants.
Wear Tolerance
1. With the boom positioned over the side of the
machine, the Boom horizontal with telescope fully
extended, using a magnetic base dial indicator,
measure and record the distance between the swing
bearing and turntable front.
2. With the boom positioned over the side of the
machine, the Boom fully elevated, retracted, and
platform rotated 90
o , using a magnetic base dial
indicator, measure and record the distance between
the swing bearing and turntable rear.
3. If a difference greater than 0.057 in. (1.40 mm) is
determined, the swing bearing should be replaced.
4. If a difference less than 0.057 in. (1.40 mm) is deter-
mined, and any of the following conditions exist, the
bearing should be removed.
a. Metal particles in the grease.
b. Increased drive power.
c. Noise.
d. Rough rotation.
5. If bearing inspection shows no defects, reassemble
bearing and return to service.
Figure 3-31. Swing Bearing Feeler Gauge Check
Figure 3-32. Swing Bearing Tolerance Measuring Point