JLG 1850SJ Service Manual - Manual (Page 191)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
3121619 – JLG Lift – 5-21
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.
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. Install backup ring (13), O-ring (14), and backup ring (13)
in inside grooves of piston (15).
6. Install two seals (19) and lock rings (18) in outer grooves
of piston.
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.
NOTE: Piston and mating end of rod must be free of oil when
installing tapered bushing.
9. Thread piston on rod until it aligns with spacer end and
install tapered bushing.
6 8
9
7
10
11
Figure 5-29. Cylinder Head Assembly
14
13
18
19
18
15
Figure 5-30. Piston Seal Kit Installation