JLG 1850SJ Service Manual - Manual (Page 270)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
5-100 – JLG Lift – 3121619
8. Insert input shaft (8) through bearing into housing (11).
You may need to push on servo piston to rotate swash
plate.
CYLINDER ASSEMBLY
1. Coat all parts with hydraulic fluid before reassembly.
RISK OF PERSONAL INJURY: COMPRESSING BLOCK SPRING
REQUIRES ABOUT 80 TO 90 LBF (350 T O 400 N). USE A
PRESS SUFFICIENT TO MAINTAIN THIS FORCE WITH REA-
SONABLE EFFORT. ENSURE SPRING IS SECURE BEFORE
AT T E M P T I N G T O I N S TA L L S P I R A L R E T A I N I N G R I N G.
RELEASE PRESSURE SLOWLY AFTER RETAINING RING IS
INSTALLED.
2. Install inner block spring washer (21), block spring (22),
and outer washer (23) in cylinder block. Using a press,
compress block spring and install retaining ring (24) in
cylinder block groove.
3. Turn block over. Install three hold-down pins (19) and
ball guide (18) to cylinder block.
4. Install pistons (16) to slipper retainer (17). Install piston/
retainer assembly in cylinder block (20). Ensure concave
surface of retainer seats on ball guide. If reusing pistons,
install them to original block bores.
5. Lubricate pistons, slippers, retainer, and ball guide
before assembly. Set cylinder kit aside on a clean surface
until needed.
6. Install slipper retainer (17) with concave side against
convex side of ball guide (18).
CYLINDER ASSEMBLY INSTALLATION
1. Set pump on its side. Hold end of shaft (8) with one
hand and keep it horizontal. Install cylinder assembly
(20) on shaft.
2. Hold shaft still and slightly rotate cylinder block to help
start shaft splines over ball guide and align it with block
splines. When cylinder block kit slides completely over
shaft splines, reposition unit with flange facing down.
1
2
3
4
5
6
8
11
Figure 5-132. Swash Plate Installation
16
17
18
19
20
21
22
23
24
Figure 5-133. Cylinder Assembly
20
11
8
Figure 5-134. Cylinder Installation