JLG 1850SJ Service Manual - Manual (Page 202)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
5-32 – JLG Lift – 3121619
11. Inspect seal and O-ring grooves in head for burrs and
sharp edges. Dress applicable surfaces as necessary.
12. Inspect cylinder head outside diameter for scoring,
damage, ovality, and tapering. Replace as necessary.
13. Inspect rod and barrel bearings for signs of correct
excessive wear or damage. Replace as necessary.
a. Thoroughly clean hole, (steel bushing) of burrs, dirt
etc. to facilitate bearing installation.
b. Inspect steel bushing for wear or other damage. If
steel bushing is worn or damaged, rod/barrel must
be replaced.
c. Lubricate inside of the steel bushing with WD40
prior to bearing installation.
NOTE: Lubrication is not required with nickel plated pins and
bearings. Install pin in composite bushing dry.
d. Press bushing into barrel or rod bushing with cor-
rect size arbor.
14. Inspect port block fittings and holding valves. Replace
as necessary.
15. 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.
1. Install O-ring (10), backup ring (9), wear ring (8), rod seal
(12), and wiper seal (11) in cylinder head (13).
2. Slide washer ring (7) and cylinder head Assembly (13) on
rod (26).
Arbor
Barrel or
Rod Bushing
Composite
Bushing
Composite
Bushing
Figure 5-56. Bushing Installation
8
9
10
11
12
13
Figure 5-57. Cylinder Head Assembly