JLG 1850SJ Service Manual - Manual (Page 207)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
3121619 – JLG Lift – 5-37
PULLING ROD OFF-CENTER CAN DAMAGE PISTON AND C YLINDER BARREL
SURFACES. USE EXTREME CARE WHEN REMOVING CYLINDER ROD, HEAD, AND
PISTON.
8. Clamp barrel securely. Pull rod assembly and cylinder
head from barrel.
9. Protect cylinder rod from damage and clamp in a vise or
holding fixture as close to piston as possible.
10. Loosen and remove bolts from tapered bushing and pis-
ton.
11. Insert bolts in threaded holes in outer piece of tapered
bushing. Progressively tighten bolts until bushing is
loose. Remove tapered bushing from piston.
12. 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.
13. Remove and discard two lock rings (14), seals (15),
backup ring (17), O-ring (18), and backup ring (17) from
piston (16).
14. Remove piston spacer (20) from rod (29). Remove and
discard O-ring (19) from inside of spacer.
15. Remove rod from holding fixture. Remove cylinder head
(21) and washer ring (24).
16. Remove and discard O-ring (21), backup ring (22), rod
wiper (26), seal (25), and two wear rings (24), from cylin-
der head (23).
SUPPORT TABLE
ROD SUPPORT
Figure 5-66. Cylinder Rod Support
Rod
Piston
Tapered
Bushing
Rod
Bolt
Figure 5-67. Tapered Bushing Removal
14
15
16
14
17
17
18
20
19
Figure 5-68. Piston Disassembly
21
22
23
24
25
26
Figure 5-69. Cylinder Head Disassembly