2-25
xx,
The jib pin alignment device consists of a hydraulic
jack mounted horizontally on the underside of the jib. A
handle for the jack is provided and is installed above
the jack on the side of the jib.
The purpose of the jib pin alignment device is to aid
in installing the fourth or “last” jib pin when setting up a
jib. This device has been designed to line up the bot-
tom jib pin hole on the left side of the crane.
To use the device, follow the proper procedure out-
lined in the Owner’s Manual to install both jib pins on
the right side of crane and the top pin on the left side.
Next remove jack handle and using the flattened end,
close jack release valve by turning handle clockwise
until it is firmly closed. Insert the round end of the handle
into the handle sleeve and pump jack until ram contacts
boom sheave case. Continue to pump slowly until jib
pin hole is exactly aligned with hole in boom ear. At this
time the final jib pin can be easily tapped into position.
If hole alignment is “over shot” due to jacking too
far, the jack can simply be relieved and the process re-
peated. To relieve the jack, use the flattened end of
jack handle to slowly turn relief valve counter clockwise
no more than one full turn.
After all jib pins are installed, relieve jack. The jib
pin alignment device is also useful when removing the
“fourth” pin. Use the jib jack to relieve jib weight in-
duced pressure on the “fourth” pin and it will be much
easier to remove.
Once the jib has been erected or stowed, it is im-
portant that the jack handle be properly placed back on
its stowage hooks and that the cotter key be properly
placed in the stowage hook to retain the handle on the
hook.
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When jib is stowed on side of crane, always leave
ram and handle sleeve pushed all the way down to re-
duce exposure to rusting.
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