Swash Plate & Servo Piston - JLG 400S Service And Maintenance Manual

SECTION 3 - CHASSIS & TURNTABLE
Lift here
43
39. Swashplate
40. Servo Piston
41. Piston Seal
42. O-ring
43. Journal Bearings
Figure 3-22. Swash Plate & Servo Piston
23. Turn housing over and remove swashplate (39) by lifting
on end opposite servo lever.
24. Remove servo piston (40). Remove piston seal (41) and
O-ring (42) from servo piston. Discard seal and O-ring.
25. Remove journal bearings (43) from housing. If bearings
will be reused, note location and orientation of each
bearing for reassembly.
26. Remove pistons (44) and slipper retainer (45) from cylin-
der block (46).
NOTE: Pistons are not selectively fitted. Units with high hourly
usage may develop wear patterns. Number pistons and
bores for reassembly if they will be reused.
27. Remove ball guide (47), hold-down pins (48), and retain-
ing ring (49) from cylinder block.
NOTE: Most repairs do not require block spring removal. Perform
this procedure only if you suspect problems with the block
spring.
3-32
39
40
42
41
44
45
47
48
49
46
53
52
50
51
44. Piston
45. Slipper Retainer
46. Cylinder Block
47. Ball Guide
48. Holddown Pins
Figure 3-23. Cylinder Kit Disassembly
RISK OF PERSONAL INJURY: COMPRESSING BLOCK SPRING REQUIRES FORCE
OF ABOUT 80 TO 90 LBF (350 TO 400 N). USE A PRESS SUFFICIENT TO MAIN-
TAIN THIS FORCE WITH REASONABLE EFFORT. ENSURE SPRING IS SECURE
BEFORE ATTEMPTING TO REMOVE SPIRAL RETAINING RING. RELEASE PRES-
SURE SLOWLY AFTER RETAINING RING IS REMOVED.
28. Turn block over. Using a press, apply pressure on block
spring washer (50) to compress block spring enough to
safely remove spiral retaining ring (51). Maintain pres-
sure and unwind spiral retaining ring (51). Carefully
release pressure and remove outer block spring washer
(50), block spring (52), and inner block spring washer
(53) from cylinder block.
49. Retaining Ring
50. Block Spring Washer
51. Spiral Retaining Ring
52. Block Spring
53. Inner Block Spring Washer
3121671