JLG 660SJ Service Manual - Manual (Page 92)

SECTION 3 - CHASSIS & TURNTABLE
3-48 – JLG Lift – 3121298
3.9 ROTARY COUPLING
Use the following procedure to install the seal kit.
1. If not already removed, remove axle oscillation valve
from cylinder barrel. The valve spool protrudes into the
barrel and will damage spool and seals if left in place.
2. Remove snap ring (12) from end.
3. Remove thrust ring (13) from same end.
4. Remove center body (10) from housing (11).
5. Cut off old seals (14,15,17,18).
6. Assemble lip seals (14) in direction shown in Figure 3-66.,
Rotary Coupling - Sheet 2 of 2.
7. Reassemble O-ring (18).
8. Heat cap seals (17) in hydraulic oil for 5 minutes at 300° F
(149° C).
9. Assemble cap seals over O-rings
10. Reinsert center body in housing (lube with hydraulic oil).
11. Replace thrust ring and snap ring.
Figure 3-65. Rotary Coupling - Sheet 1 of 2
1. Rotary Coupling

2. Torque Lug
3. Locknut

4. Flat Washer
5. Bolt

6. Nut

7. Bracket
4
3
4
5
5
3
4
1
4
2
Detail A
7
6
4
4
5