JLG 740A, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-34 – JLG Lift – 3121160
23. Turn housing over and remove the swashplate (39)
by lifting on the end opposite the servo lever.
24. Remove the servo piston (40). Remove the piston
seal (41) and O-ring (42) from the servo piston. Dis-
card the seal and O-ring.
25. Remove the journal bearings (43) from the housing.
If the bearings are to be reused, note the location
and orientation of each bearing for reassembly.
26. Remove pistons (44) and slipper retainer (45) from
the cylinder block (46).
The pistons are not selectively fitted, however units
with high hourly usage may develop wear patterns.
Number the pistons and bores for reassembly if they
are to be reused.
27. Remove the ball guide (47), hold-down pins (48),
and retaining ring (49) from the cylinder block.
NOTE: Most repairs do not require block spring removal.
Perform this procedure only if you suspect problems
with the block spring.
RISK OF PERSONAL INJURY: COMPRESSING THE BLOCK SPRING
REQUIRES FORCE OF ABOUT 80 TO 90 LBF (350 TO 400 N). USE
A PRESS SUFFICIENT TO MAINTAIN THIS FORCE WITH REASON-
ABLE EFFORT. ENSURE THE SPRING IS SECURE BEFORE
ATTEMPTING TO REMOVE THE SPIRAL RETAINING RING.
RELEASE THE PRESSURE SLOWLY AFTER THE RETAINING RING
IS REMOVED.
41
42
40
Lift here
39
43
39. Swashplate
40. Servo Piston
41. Piston Seal
42. O-ring
43. Journal Bearings
Figure 3-20. Swash Plate & Servo Piston
51
50
52
53
46
49
48
47
45
44
44. Piston
45. Slipper Retainer
46. Cylinder Block
47. Ball Guide
48. Holddown Pins 49. Retaining Ring
50. Block Spring Washer
51. Spiral Retaining Ring
52. Block Spring
53. Inner Block Spring Washer
Figure 3-21. Cylinder Kit Disassembly