JLG 660SJ Service Manual - Manual (Page 81)

SECTION 3 - CHASSIS & TURNTABLE
3120840 – JLG Lift – 3-31
Bearing set/miscellaneous parts
Rotary group complete 9 pistons, cylinder sub-assembly,
valve plate (cw or ccw corresponding to the order) retain-
ing plate and retaining ball.
Swash Plate
Parts of the control device: control piston, piston rod,
plug, spring stopper max flow , hex. nut, and hex. head nut
Spare parts kit DFR pilot valve
Replacing the Drive Shaft Seal
1. Remove the snap ring
2. Change the shaft seal and check its sliding surface
(drive shaft) and housing, grease
the sealing ring.
3. Be careful while you seal the drive shaft, use an
adhesive tape to protect the splines.