JLG 660SJ Service Manual - Manual (Page 72)

SECTION 3 - CHASSIS & TURNTABLE
3-28 – JLG Lift – 3121298
RISK OF PERSONAL INJURY: COMPRESSING THE BLOCK SPRING REQUIRES
ABOUT 80 TO 90 LBF (350 TO 400 N) OF FORCE. USE A PRESS SUFFICIENT TO
MAINTAIN THIS FORCE WITH REASONABLE EFFORT. ENSURE SPRING IS
SECURE BEFORE ATTEMPTING TO INSTALL THE SPIRAL RETAINING RING.
RELEASE PRESSURE SLOWLY AFTER RETAINING RING IS INSTALLED.
3. Install inner block spring washer (4), block spring (5), and
outer washer (6) in cylinder block (6A). Using a press,
compress block spring enough to expose retaining ring
groove. Wind spiral retaining ring (7) in cylinder block
groove.
4. Turn block over and install retaining ring (8), hold-down
pins (9), and ball guide (10) to cylinder block.
5. Install pistons (11) to slipper retainer (12). Install piston/
retainer assembly in cylinder block. Ensure concave sur-
face of retainer seats on ball guide. If reusing pistons,
install them in original block bores. Lubricate pistons,
slippers, retainer, and ball guide before assembly. Set
cylinder kit aside on a clean surface until needed.
6. Install journal bearings (13) in housing seats. Use assem-
bly grease to keep bearings seated during assembly.
Ensure locating nubs drop into seat cavities. If reusing
bearings, install in original location and orientation.
Lubricate journal bearings.
Figure 3-34. Swash Plate and Journal Bearing
7. Install swashplate (14) in housing. Tilt swashplate and
guide servo lever ball into its socket in the servo piston
rod. Ensure swashplate seats into journal bearings and
moves freely. Lubricate running surface of swashplate.
4. Block Spring Washer
5. Block Spring
6. Outer Washer
6A. Cylinder Block
7.
Spiral Retaining Ring
8. Retaining Ring
9. Holddown Pins
10. Ball Guide
11. Piston
12. Slipper Retainer
7
6
5
4
6A
8
9
10
12
11
13. Journal Bearings
14. Swash Plate
14
13
13