Piston Disassembly - JLG T500J Service And Maintenance Manual

ASSEMBLY
INCORRECT SEAL INSTALLATION CAN CAUSE CYLINDER LEAKS AND IMPROPER
C YLINDER OPERATION. ENSURE ALL PISTON SEALS ARE CORREC TLY
INSTALLED. REFER TO CROSS SECTION ILLUSTRATIONS FOR CORRECT SEAL
ORIENTATION.
NOTE: Use proper cylinder seal kit for cylinder assembly. See your
JLG Parts Manual.
NOTE: Apply a light film of hydraulic oil to all components before
assembly.
1. Support rod in holding fixture.
2. Slide spacer (13) on the rod (2).
3. Install spring (5) onto the spacer and rod.
4. Install o-ring (8) inside the piston (4).
5. Install o-ring (7) and backup ring (14) on the piston.
14
7
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Figure 5-27. Piston Disassembly
6. Screw the piston (4) onto rod. Do not dislodge or dam-
age seals.
7. Install locknut (6) on the rod.
3121200
SECTION 5 - BASIC HYDRAULIC INFORMATION & SCHEMATICS
4
INSERTING ROD OFF-CENTER CAN DAMAGE PISTON AND CYLINDER BARREL
SURFACES. USE EXTREME CARE WHEN INSTALLING CYLINDER ROD, HEAD,
AND PISTON.
8
MAE29310
8. Install rod seal (11) and wiper seal (12) inside the cylin-
der head.
3
Figure 5-28. Cylinder Head Assembly
9. Remove cylinder rod from holding fixture.
10. Position cylinder barrel in suitable holding fixture.
11. Clamp barrel securely and support rod. Insert piston end
into barrel. Do not damage or dislodge piston loading o-
ring and seal ring.
12. Screw the cylinder head gland into the barrel using a
spanner wrench. and tighten until punch mark matches.
Figure 5-29. Cylinder Head Installation
13. After the cylinder has been reassembled, the rod should
be pushed all the way in (fully retracted) prior to the
reinstallation of any holding valve or valves.
11
12
MAE29320
MAE29760
5-21