JLG 1850SJ Service And Maintenance Manual page 324

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
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.
ROD SUPPORT
Figure 5-52. Cylinder Rod Support
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.
Figure 5-53. Tapered Bushing Removal
13. Screw piston counter-clockwise by hand and remove
from cylinder rod.
5-72
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.
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.
15
20
Figure 5-54. Piston Disassembly
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).
25
26
27
Figure 5-55. Cylinder Head Disassembly
15
16
17
18
19
18
21
22
23
24
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