BOOM EXTEND CYLINDERS
The outer case is the “moving” member of the cylinder. The hollow shaft is “stationary”.
The hollow shaft ports the piston and case end to retract the cylinder while a tube within
the “shaft” ports the piston and head gland to extend the cylinder.
Disassemble the boom extend cylinders by the following procedure:
1. Using an adjustable spanner wrench, remove head gland of cylinder. As head gland is
loosened, it may be necessary to begin to move rod out of cylinder tube.
2. With head gland fully disengaged, remove as an assembly, piston rod, head gland,
and piston assembly.
3. To remove piston, remove the setscrews which secure the piston retaining ring to
piston rod.
NOTE: There are two types of cylinders used on the machine. Both cylinders have
setscrews located under the wear ring to retain the piston to the rod.
NOTE: After removing the piston, the retainer can be removed to reseal the inner
tube.
BOOM LIFT CYLINDER
Disassemble the boom lift cylinder by the following procedure:
1. Remove the locking socket head cap screw from the draw ring. With an adjustable
spanner wrench, remove the draw ring and head gland.
Failure to remove the locking capscrew may result in serious thread damage.
NOTE: One turn off, back 1/3 turn alternately.
2. Remove the head gland, shaft, and piston from the case.
3. Remove piston and gland by removing setscrews in retaining collar removing retaining
nut. Remove piston and gland from rod. Access to all seal units is now possible.
HYDRAULIC CYLINDER INSPECTION
Wash the cylinder bore and all the components with solvent and make the following
inspection:
CYLINDER BORE
For signs of scoring and deep scratches. In the event of any defects, reassemble the entire
cylinder and contact your distributor.
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REVISED:
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