JLG 1850SJ Service And Maintenance Manual page 336

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
PULLING ROD OFF-CENTER CAN DAMAGE PISTON AND CYLINDER 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.
ROD SUPPORT
Figure 5-80. Cylinder Rod Support
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.
Figure 5-81. Tapered Bushing Removal
5-84
SUPPORT TABLE
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.
14
19
20
Figure 5-82. Piston Disassembly
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).
24
25
26
Figure 5-83. Cylinder Head Disassembly
14
15
16
17
18
17
21
22
23
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