JLG 510AJ Service Manual - Manual (Page 107)

SECTION 3 - CHASSIS AND TURNTABLE
3121181 – JLG Lift – 3-65
3. Lower the boom to horizontal and fully extend boom.
4. At position indicated on Figure 2-30, try and insert a
0.0015" feeler gauge between bolt head and hardened
washer at arrow indicated position.
Wear Tolerance
1. With boom positioned over side of machine, the Upper
Boom horizontal with telescope fully extended and Mid/
Lower Boom stowed, using a magnetic base dial indica-
tor, measure and record the distance between the swing
bearing and turntable.
2. At the same point, with the boom positioned over the
side of the machine, the Upper Boom fully elevated and
the Mid/Lower Boom fully elevated, using a magnetic
base dial indicator, measure and record the distance
between the swing bearing and turntable.
If a difference greater than 0.057 in. (1.40 mm) is deter-
mined, the swing bearing should be replaced.
3. 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.
4. If bearing inspection shows no defects, reassemble
bearing and return to service.
Swing Bearing Torque Value
Install with Loctite - 240 ft. lbs. (326 Nm).
SWING
BEARING
FRAME REF.
TURNTABLE REF.
MEASURING
POINT
Figure 3-51. Swing Bearing Tolerance Measuring Point
3
7 21
17
13
9
5
1
24
20
16
12
22
18
14
10
6
2
23
19
15
11
8 4
17
13
9
5
1
16
12
18
14
10
6
2
15
7
3
11
8
4
Figure 3-52. Swing Bearing Torque Sequence