JLG 1850SJ Service Manual - Manual (Page 214)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
5-44 – JLG Lift – 3121619
Steer Cylinder
Refer to Figure 5-81.
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.
DO NOT FULLY EXTEND CYLINDER TO THE END OF STROKE.
RETRACT CYLINDER SLIGHTLY TO AVOID TRAPPING PRES-
SURE.
2. Operate hydraulic power source and extend cylinder.
Shut down and disconnect power source.
3. Place cylinder barrel in a suitable holding fixture.
4. Remove self-tapping screw (9) from cylinder head (5)
and barrel (2).
5. Unscrew cylinder head with pin-face spanner wrench.
PULLING ROD OFF-CENTER CAN DAMAGE PISTON AND C YLINDER BARREL
SURFACES. USE EXTREME CARE WHEN REMOVING CYLINDER ROD, HEAD, AND
PISTON.
6. Clamp barrel securely. Pull rod assembly and cylinder
head from barrel.
7. Protect cylinder rod from damage and clamp in a vise or
holding fixture as close to piston as possible.
REMOVE SEALS USING A BRASS OR PLASTIC PICK ONLY. DO NOT USE A KNIFE,
SHARP OBJECT, OR SCREW DRIVER. MAKE NOTE OF SEAL ORIENTATION
BEFORE REMOVING FOR PROPER INSTALLATION.
8. Remove setscrew (13) from piston (12). remove piston
from rod (21).
9. Remove and discard O-ring (11), seal (15), and wear ring
(14) from piston. Remove rod from clamp or vise.
9
2
5
Figure 5-79. Cylinder Head Removal
SUPPORT TABLE
ROD SUPPORT
Figure 5-80. Cylinder Rod Support