JLG T500J, Service And Maintenance Manual

Page: 195 / 306

SECTION 5 - BASIC HYDRAULIC INFORMATION & SCHEMATICS
3121200 5-21
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.
6. Screw the piston (4) onto rod. Do not dislodge or dam-
age seals.
7. Install locknut (6) on the rod.
8. Install rod seal (11) and wiper seal (12) inside the cylin-
der head.
9. Remove cylinder rod from holding fixture.
10. Position cylinder barrel in suitable holding fixture.
INSERTING ROD OFF-CENTER CAN DAMAGE PISTON AND CYLINDER BARREL
SURFACES. USE EXTREME CARE WHEN INSTALLING C YLINDER ROD, HEAD,
AND PISTON.
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.
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.
MAE29310
4
8
7
14
14
Figure 5-27. Piston Disassembly
MAE29320
3
11
12
Figure 5-28. Cylinder Head Assembly
MAE29760
Figure 5-29. Cylinder Head Installation