Cylinder head seal kit installation -56 – JLG 1850SJ Service Manual User Manual
Page 226
SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
5-56
– JLG Lift –
3121619
CLEANING AND INSPECTION
1.
Clean parts thoroughly with approved cleaning solvent.
2.
Inspect cylinder rod for scoring, tapering, ovality, or
other damage. If necessary, dress rod with Scotch Brite
or equivalent. Replace rod if necessary.
3.
Inspect inner surface of cylinder barrel tube for scoring
or other damage. Check inside diameter for tapering or
ovality. Replace if necessary.
4.
Inspect threaded portion of barrel for damage. Dress
threads as necessary.
5.
Inspect piston surface for damage, scoring, or distortion.
Dress piston surface or replace piston as necessary.
6.
Inspect threaded portion of piston for damage. Dress
threads as necessary.
7.
Inspect seal and O-ring grooves in piston for burrs and
sharp edges. Dress surfaces as necessary.
8.
Inspect cylinder head inside diameter for scoring or
other damage, and for ovality and tapering. Replace as
necessary.
9.
Inspect threaded portion of cylinder head for damage.
Dress threads as necessary.
10.
Inspect seal and O-ring grooves in head for burrs and
sharp edges. Dress applicable surfaces as necessary.
11.
Inspect cylinder head outside diameter for scoring,
damage, ovality, and tapering. Replace as necessary.
12.
Inspect spacer for burrs and sharp edges. Dress inside
diameter surface with Scotch Brite or equivalent.
13.
Inspect port block fittings and cartridge valves. Replace
as necessary.
14.
Inspect oil ports for blockage or presence of dirt or other
foreign material. Repair as necessary.
ASSEMBLY
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.
IMPROPER SEAL INSTALLATION CAN CAUSE CYLINDER LEAKS AND IMPROPER
CYLINDER OPERATION. WIPER SEAL ROUNDED SURFACE MUST FACE TOWARD
PISTON AS NOTED DURING DISASSEMBLY.
1.
Install rod seal (20), wiper seal (21), and locking ring (22)
in cylinder head (23).
2.
Install two wear rings (17) in cylinder head.
3.
Install backup ring (19) and O-ring (18) on cylinder head.
4.
Install cylinder head assembly (23) on rod (7). Do not
damage or dislodge wiper and rod seals. Push cylinder
head along rod to rod end.
17
18
19
20
21
22
23
Figure 5-102. Cylinder Head Seal Kit Installation