Master Cylinder - JLG 400S Service And Maintenance Manual

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Table of Contents

Master Cylinder

DISASSEMBLY OF THE CYLINDER SHOULD BE PERFORMED ON A CLEAN WORK

SURFACE IN A DIRT FREE WORK AREA.

1. Connect a suitable auxiliary hydraulic power source to

the cylinder port block fitting.

DO NOT FULLY EXTEND CYLINDER TO THE END OF STROKE. RETRACT CYLINDER

SLIGHTLY TO AVOID TRAPPING

2. Operate the hydraulic power source and extend the

cylinder. Shut down and disconnect the power source.

Adequately support the cylinder rod, if applicable.

3. Remove the plugs from the cylinder ports.

4. Place the cylinder barrel into a suitable holding fixture.

PROTECTED ROD CLAMP

SUPPORT TABLE

Figure 5-68. Cylinder Barrel Support

SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS

BARREL CLAMP

5. Mark cylinder head and barrel with a center punch for

easy realignment. Using a hook spanner wrench,

unscrew the cylinder head from the barrel.

Figure 5-69. Cylinder Head Removal

6. Attach a suitable pulling device to the cylinder rod port

block end or cylinder rod end, as applicable.

EXTREME CARE SHOULD BE TAKEN WHEN REMOVING THE CYLINDER ROD,

HEAD AND PISTON. AVOID PULLING THE ROD OFF-CENTER, WHICH COULD

CAUSE DAMAGE TO THE PISTON AND CYLINDER BARREL SURFACES.

7. With the barrel clamped securely, apply pressure to the

rod pulling device and carefully withdraw the complete

rod assembly from the cylinder barrel.

Figure 5-70. Cylinder Barrel Support

CYLINDER HEAD

SUPPORT TABLE