JLG 1850SJ Service And Maintenance Manual page 320

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
ASSEMBLY
IMPROPER SEAL INSTALLATION CAN CAUSE CYLINDER LEAKS AND IMPROPER
CYLINDER OPERATION.
NOTE: Use proper cylinder seal kit for cylinder assembly. See your
JLG Parts Manual.
Apply a light film of hydraulic oil to all components before
assembly.
1. Install backup ring (10) and O-ring (11) in outside diame-
ter grooves of cylinder head (8).
2. Install rod seal (7), wiper seal (6), and three wear rings (9)
in cylinder head as shown.
17
18
20
Figure 5-43. Cylinder Head Assembly
3. Slide washer ring (5) on rod (21). Install cylinder head
assembly (8) on rod. Do not damage or dislodge wiper
and rod seals. Push cylinder head to rod end.
4. Install spacer (12) on rod (21).
5-68
21
4
NOTE: Piston and mating end of rod must be free of oil when
5. Install backup ring (13), O-ring (14), and backup ring (13)
in inside grooves of piston (15).
6. Install two seals (13) and lock rings (14) in outer grooves
of piston.
3
15
16
Figure 5-44. Piston Seal Kit Installation
7. Using suitable protection, clamp cylinder rod in a vise or
similar holding fixture as close to piston as possible.
8. Thread piston on cylinder rod hand tight. Ensure O-ring
and back-up rings are not damaged or dislodged.
installing tapered bushing.
9. Thread piston on rod until it aligns with spacer end and
install tapered bushing.
14
13
13
14
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