SECTION 3 - CHASSIS & TURNTABLE
3121171
3-107
6.
Position machine back to the first position as outlined in
Step 1 and shown in Figure 3-68. The dial indicator
should return to zero. If dial indicator does not return to
zero, determine corrective action and repeat test.
7.
Determine which model turntable bearing is installed
by checking location shown in Figure 3-67. and compar-
ing with markings in Table 3-6.
NOTE:
JLG Boom Lifts may utilize multiple model bearings.
Figure 3-67. Bearing Marking Location
Determine turntable bearing wear measurement allowance by
bearing model as shown in Figure 3-7.
9.
Replace turntable bearing if any of the following condi-
tions exist:
a.
Bearing wear measurement is greater than allowed
in Table 3-7.
NOTE:
If bearing markings are illegible, use 0.179 in (4.54 mm) as
the wear measurement.
b.
Increased swing power required.
c.
Noise is present when turntable is rotated.
d.
Rough operation when turntable is rotated.
Table 3-6. Bearing Model Marking Identification
Model
Marking
1
1234567, XXXXX, XXXXX
2
JLG 1234567 A
XX 0001 11 04
3
V 12 3456 789 01 23 4567
SERIAL NR. 08/_ _ _ _ YEAR _ _ _ _
PAG/POS. _ _ _ _ _ _/_ _ _ _ WEIGHT _ _ _ Kg.
JLG PART #1234567
4
D123456
Table 3-7. Turntable Bearing Wear by Bearing Model
Bearing Model
Wear Measurement
1
0.179 in (4.54 mm)
2
0.205 in (5.214 mm)
3
0.255 in (6.47 mm)
4
0.197 in (5 mm)
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