JLG 1850SJ Service Manual - Manual (Page 189)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
3121619 – JLG Lift – 5-19
8. Using suitable protection, clamp cylinder rod in a vise or
similar holding fixture as close to piston as possible.
9. Loosen and remove bolts from tapered bushing and pis-
ton.
10. Insert bolts in threaded holes in outer piece of tapered
bushing. Progressively tighten bolts until bushing is
loose. Remove tapered bushing from piston.
11. Screw piston counter-clockwise by hand and remove
from cylinder rod.
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.
12. Remove and discard backup ring (13), O-ring (14), and
backup ring (13) from inside grooves of piston (15).
13. Remove and discard two lock rings (18) and seals (19)
from outside grooves of piston.
14. Remove piston spacer (12) from rod (7).
15. Remove rod from holding fixture. Remove cylinder head
(8) and washer ring (5)
16. Remove and discard three wear rings (9), wiper seal (6),
and rod seal (7) from inside of cylinder head (8). Remove
and discard O-ring (11) and backup ring (10) from outer
groves of cylinder head.
Rod
Piston
Tapered
Bushing
Rod
Bolt
Figure 5-25. Tapered Bushing Removal
14
13
18
19
18
15
Figure 5-26. Piston Disassembly
6 8
9
7
10
11
Figure 5-27. Cylinder Head Disassembly