JLG 680S, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121234 3-141
3.21 ROTARY COUPLING (PRIOR TO SN 0300137913)
Use the following procedure to install the seal kit.
1. If not already removed, remove the axle oscillation valve
from the cylinder barrel. The spool of the valve pro-
trudes into the barrel and will damage the spool and
seals if left in place.
2. Remove snap ring (12) from end.
3. Remove thrust ring (13) from the same end.
4. Remove center body (10) from housing (11).
5. Cut off old seals (14,15,17 and 18).
6. Assemble lip seals (14) in direction shown in Figure 3-
81., Rotary Coupling (Prior to SN 0300137913) - 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 into housing (lube with hydraulic
oil).
11. Replace thrust ring and snap ring.
Table 3-8. Coupling Port Information Table (Prior to SN
0300137913)
Port
No.
Out
let
Port
Size
Description
Operating
Pressure
PSI (Bar)
Proof
Pressure
PSI (Bar)
1 1 -8 Brake 450 (31) 675 (47)
2 2 -6 2 Speed 4500 (310) 6750 (465)
3 1 -6 Steer 2500 (172) 3750 (259)
4 1 -6 Steer 2500 (172) 3750 (259)
5 2 1-6, 1-16 Drive Reverse 4500 (310) 6750 (465)
6 1 -16 Drive Forward 4500 (310) 6750 (465)
7 3 2-8, 1-6 Drain 250 (17) 375 (26)