JLG 660SJ Service Manual - Manual (Page 86)

SECTION 3 - CHASSIS & TURNTABLE
3-36 – JLG Lift – 3121202
3.7 SWING HUB
Adjustment Procedures
NOTE: The swing bearing high spot is usually marked with a
colored paint.
1. Ensure swing drive is located on bearing gear max
eccentric tooth (high spot).
2. With mounting free to slide, shim between pinion
and bearing gear teeth to achieve 0.008 - 0.012 in.
(0.20 - 0.30 mm) backlash.
3. Install a pry bar into hole in turntable base plate and
pry swing hub back tight against shim and bearing.
4. Torque bolts according to the torque chart in Section
1.
Disassembly
1. Loosen all 12 cover bolts (12)&(13) and drain the oil
from the unit.
2. Remove the 12 cover bolts (12)& (13) and lift off the
cover (6). Remove and discard the O-ring (5) from
the counterbore of the cover (6).
3. Remove the input gear (8) and thrust washer (10).
4. Lift out the carrier assembly (3) and top thrust
washer (11). The thrust washer (11) may stick to the
inside of the carrier (3).
5. Remove the input thrust spacer (9).
6. Lift out the internal gear (2) and thrust washer (11).
The thrust washer (11) may stick to the under side of
the carrier (3).
7. Remove the retaining ring (1I) from the output shaft
(1A) and discard.
EYE PROTECTION SHOULD BE WORN DURING RETAINING RING
(1I) REMOVAL.
8. Remove bearing shim (1H) from the output shaft
(1A).
9. The output shaft (1A) may now be pressed out of the
hub (1G).
10. THe bearing cups (1C)&(1E) will remain in hub (1G)
as will bearing cone (1F). Bearing cone (1D) will
remain on the same output shaft (1A). The seal (1B)
will be automatically removed during this procedure.
NOTE: If bearing replacement is necessary, the bearing
cups can be removed with a slide hammer puller
driven out with a punch.
11. To remove the cluster gears (3F) from the carrier
(3A), drive the anti-roll pin (3G) into the planet shaft
(3E) may now be tapped out of the carrier. After
planet shaft (3E) has been removed the roll pin (3G)
can be driven out.
12. The cluster gear (3F) can now be removed from the
carrier (3A). THe thrust washers (3B) will be
removed with the cluster gear (3F).
13. The needle rollers (3C) and spacer (3D) are now
removed from the cluster gear (3F).
Figure 3-40. Swing Torque Hub Adjustment