JLG 1850SJ Service Manual - Manual (Page 193)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
3121619 – JLG Lift – 5-23
Platform Level Cylinder
Refer to Figure 5-37.
DISASSEMBLY
CCONTAMINATION MAY DAMAGE EQUIPMENT. DISASSEMBLE CYLINDER ON A
CLEAN WORK SURFACE IN A DIRT FREE WORK AREA.
1. Connect a suitable auxiliary hydraulic power source to
cylinder port fitting.
2. Operate hydraulic power source and extend cylinder.
Shut down and disconnect power source. Adequately
support cylinder rod, if applicable.
3. Place cylinder barrel in a suitable holding fixture.
4. Remove cartridge-type counterbalance valve and fit-
tings from cylinder port block. Discard O-rings.
5. If neccessary, remove eight capscrews (8) and retainer
cap (7). Remove O-Ring plug (12) and setscrew (11).
Remove cylinder length sensor assembly (6) from barrel
(3).
6. Place cylinder barrel in a suitable holding fixture. Tap
around outside of cylinder head retainer with a suitable
hammer to break thread-locking compound.
7. Mark cylinder head and barrel with a center punch for
realignment.
8. Remove setscrew (1) from barrel (3). Unscrew cylinder
head with pin-face spanner wrench.
Figure 5-34. Cylinder Barrel Support
3
5 8
6
9
10
7
11
12
Figure 5-35. Cylinder Length Sensor Removal
.
.
Mark For Reassembly
Figure 5-36. Cylinder Head Removal