JLG 1850SJ Service Manual - Manual (Page 195)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
3121619 – JLG Lift – 5-25
OFF-CENTER CAN DAMAGE PISTON AND CYLINDER BARREL SURFACES. USE
EXTREME CARE WHEN REMOVING CYLINDER ROD, HEAD, AND PISTON.
9. Clamp barrel securely. Pull rod assembly and cylinder
head from barrel.
10. Protect cylinder rod from damage and clamp in a vise or
holding fixture as close to piston as possible.
11. Loosen and remove bolts from tapered bushing and pis-
ton.
12. Insert bolts in threaded holes in outer piece of tapered
bushing. Progressively tighten bolts until bushing is
loose. Remove tapered bushing from piston.
13. 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.
14. Remove and discard two lock rings (15), seals (16),
backup ring (18), O-ring (19), and backup ring (18) from
piston (17).
15. Remove piston spacer (20) from rod.
16. Remove rod from holding fixture. Remove cylinder head
(24).
17. Remove and discard backup ring (21), O-ring (22), O-ring
(23), rod wiper (27), seal (26), and two wear rings (25),
from cylinder head (24).
SUPPORT TABLE
ROD SUPPORT
Figure 5-38. Cylinder Rod Support
Rod
Piston
Tapered
Bushing
Rod
Bolt
Figure 5-39. Tapered Bushing Removal
15
16
17
15
18
18
19
20
Figure 5-40. Piston Disassembly
21
22
23
24
25
26
27
Figure 5-41. Cylinder Head Disassembly