SECTION 5 - BASIC HYDRAULICS INFORMATION & SCHEMATICS
31215031
5-25
Main Boom Telescope Cylinder
DISASSEMBLY
NOTE:
Refer to Figure 5-28. Main Boom Lift Cylinder Assembly
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.
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.
5.
Mark cylinder head and barrel with a center punch for
easy realignment. Using an allen wrench, loosen the cyl-
inder head retainer capscrews and remove capscrews
from cylinder barrel.
Figure 5-40. Marking Cylinder for Alignment
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.
6.
Clamp barrel securely. Pull rod assembly and cylinder
head from barrel.
7.
Protect cylinder rod from damage and clamp in a vise or
holding fixture as close to piston as possible.
Figure 5-41. Cylinder Rod Support
MAE33420
PUNCH MARK
CYLINDER HEAD
BARREL
CAPSCREW
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