4-14 Published 08/16/19 Control # 112-05
BOOM 500E2 SERVICE MANUAL
14. Using special drive tool, drive the packing gland into the
barrel assembly.
15. Insert one end of round ring into groove in barrel
assembly and spiral the ring into groove with straight
blade screw driver.
16. Slide large washer into position on end of packing gland
and retain with the external snap ring being sure that
snap ring contracts completely and properly into the
snap ring gland groove.
EXTEND CYLINDER REPAIR
Extend Cylinder Disassembly
1. After cylinder has been removed from boom, place on
supports and place drain pan under holding valve and
cylinder head area.
2. Retract cylinder shaft with oil from the hydraulic system
until about 12 inches (30 cm) of shaft is extended. The
barrel must be filled with oil to prevent a compressed air
chamber being formed which could result in injury at
disassembly. Relieve any trapped hydraulic pressure
which might remain in the cylinder.
3. Remove any plug or fitting that is in the retract port in the
cylinder butt plate. Using a special drive tool, drive the
packing gland into the barrel assembly to expose the
round cross section retaining ring. Then use a small
needle nose locking plier to clamp the round cross
section retaining ring to prevent it from rotating in the
groove. Use two straight blade screw drivers: one to pry
the end of the ring out of the groove and the other to pry
the ring out of the barrel assembly.
4. De-burr ring groove edge after removing round ring.
Failure to do so will damage packing gland and or barrel
assembly when packing gland is removed.
5. Plug retract port in the cylinder butt plate with SAE #8
O.-Ring boss plug and pull on the rod assembly to force
packing gland out of the barrel assembly.
6. If step 5 fails to break packing gland loose from the
barrel assembly, remove the plug from the retract port
and plug the extend port in the cylinder butt plate (SAE
#8 O.-Ring boss). Apply retract pressure to cylinder to
Pressure line from a porta-power
or hydraulic line from the crane
circuit valve. Read step 5 and 6
before performing this step.
Shaft extended
about 12 inches
Retaining Ring
Washer
Snap Ring
Cylinder Barrel
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