JLG 1850SJ Service And Maintenance Manual page 349

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 O-ring (19), two wear rings (21),
and seal (22) from piston (20).
15. Remove and discard O-ring (18) from spacer (17).
20
21
22
21
Figure 5-102. Piston and Spacer Disassembly
16. Remove rod from holding fixture and remove cylinder
head.
17. Remove and discard wiper (11), seal (12), wear ring (16),
O-ring (15), and backup ring (14) from cylinder head
(13).
16
15
14
Figure 5-103. Cylinder Head Disassembly
3121619
SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
19
18
17
13
11
12
CLEANING AND INSPECTION
CLEAN PARTS THOROUGHLY WITH WATER AND A RUST PREVENTATIVE ONLY.
DO NOT USE ANY FORM OF DETERGENT OR SOAP.
1. Inspect cylinder rod for scoring, tapering, ovality, or
other damage. If necessary, dress rod with Scotch Brite
or equivalent. Replace rod if necessary.
2. Inspect threaded portion of rod for excessive damage.
Dress threads as 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 piston surface for damage, scoring, or distortion.
Dress piston surface or replace piston as necessary.
5. Inspect threaded portion of piston for damage. Dress
threads as necessary.
6. Inspect seal and O-ring grooves in piston for burrs and
sharp edges. Dress surfaces as necessary.
7. Inspect cylinder head inside diameter for scoring or
other damage, and for ovality and tapering. Replace as
necessary.
8. Inspect threaded portion of head for damage. Dress
threads as necessary.
9. Inspect seal and O-ring grooves in head for burrs and
sharp edges. Dress applicable surfaces as necessary.
10. Inspect cylinder head outside diameter for scoring,
damage, ovality, and tapering. Replace as necessary.
11. Inspect spacer for burrs and sharp edges. If necessary,
dress inside diameter surface with Scotch Brite or equiv-
alent.
12. Inspect port block fittings and cartridge valves. Replace
as necessary.
13. Inspect oil ports for blockage or presence of dirt or other
foreign material. Repair as necessary.
5-97