Hydraulic Cylinders; Axle Extend Cylinder - JLG 1850SJ Service And Maintenance Manual

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5.3 HYDRAULIC CYLINDERS

Refer to Figure 5-27.

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 PRES-

2. Operate hydraulic power source and extend cylinder.

Shut down and disconnect power source. Adequately

support cylinder rod.

3. 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.

PROTECTED ROD CLAMP

SUPPORT TABLE

Figure 5-24. Cylinder Barrel Support

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS

BARREL CLAMP

5. Mark cylinder head and barrel with center punch marks

for later realignment. Remove the capscrews (4).

Figure 5-25. Capscrew Removal

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

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, carefully withdraw the

complete rod assembly from the cylinder barrel.

Figure 5-26. Cylinder Rod Support

8. Using suitable protection, clamp the cylinder rod in a

vise or holding fixture as close to the piston as possible.

SUPPORT TABLE