Brake Release Cylinder - JLG T500J Service And Maintenance Manual

SECTION 5 - BASIC HYDRAULIC INFORMATION & SCHEMATICS

Brake Release Cylinder

DISASSEMBLY
CONTAMINATION MAY DAMAGE EQUIPMENT. DISASSEMBLE CYLINDER ON A
CLEAN WORK SURFACE IN A DIRT FREE WORK AREA.
1. Connect a suitable auxiliary hydraulic power source to
cylinder port block fitting.
DO NOT FULLY EXTEND CYLINDER TO THE END OF STROKE. RETRACT CYLINDER
SLIGHTLY TO AVOID TRAPPING PRESSURE.
2. Operate hydraulic power source and extend cylinder.
Shut down and disconnect power source. Adequately
support cylinder rod, if applicable.
3. If applicable, remove cartridge-type counterbalance
valve and fittings from cylinder port block. Discard o-
rings.
4. Place cylinder barrel in a suitable holding fixture. Tap
around outside of cylinder head retainer with a suitable
hammer to break thread-locking compound.
ROD SUPPORT
PROTECTED ROD CLAMP
SUPPORT TABLE SUPPORT TABLE
Figure 5-21. Cylinder Barrel Support
5. Mark cylinder head and barrel with a center punch for
easy realignment. Unscrew cylinder head (3) with span-
ner wrench.
6. Remove and discard o-ring (9) and backup ring (10) from
barrel.
5-18
BARREL CLAMP
Figure 5-22. Cylinder Head Removal
PULLING ROD OFF-CENTER CAN DAMAGE PISTON AND CYLINDER BARREL
SURFACES. USE EXTREME CARE WHEN REMOVING CYLINDER ROD, HEAD, AND
PISTON.
7. Clamp barrel securely. Pull rod (2) assembly from barrel
(1).
8. Protect cylinder rod from damage and clamp in a vise or
holding fixture as close to piston as possible.
ROD SUPPORT
Figure 5-23. Cylinder Rod Support
MAE29770
SUPPORT TABLE
3121200