MAINTENANCE PROCEDURES
1000 HOUR MAINTENANCE
ADJUST
EXTENSION
-RETRACTION
CHAINS
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-
TO CHECK: Raise the
boom
to the horizontal position. The
proper
adjustment
can
be
checked with a tape measure. Extend
the
boom
fully, then retract the
boom
about one inch.
On
either
side
of
the middle
boom
section estimate the center. Place one
end
of
the tape measure
on
the top surface
of
the
boom
directly above the estimated center.
IJXo
0 0 0 0 0 0 0 0 0
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TOLERANCE: The measurement from the top surface
of
the
boom
to the lowest part
of
the extension chain should
be
no
less than 2 3/8 inches.
TO ADJUST:
If
the measurement is less than
23/8
inches,
tighten the chain anchor (A), which is located
on
the top, front
of
the large
boom
tube, as follows:
A. Tighten an adjustable wrench across the flat part
of
the
chain
just
ahead
of
the chain anchor (A).
B. With a 1 7/16 inch wrench tighten the one inch nut to
collapse the spring. Continue to tighten until the chain is
in
tolerance.
C.
With a feeler gauge check the gap between the spring (B).
The gap should
be
no less than .030.
The
spring coils should
never
be
collapsed completely.
5-22
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MIDDLE
BOOM
MIDPOINT
B A
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