3-30
FINAL CHAIN ADJUSTMENT AND FIELD ADJUSTMENT
Cycle boom extension from full extension to retraction five times while varying the boom
angle. Then set the boom horizontal and fully extended for the final adjustment.
(Illustration C)
Check both extension and retraction chain "drape" at the center of the 8" (20 cm) third
stage inspection windows.
First adjust the extension chains until the "drape" is matched. Then adjust the retraction
chains (using adjuster bolts with 1-1/8" hex heads). Do not exceed a torque of 20 foot-
pounds (27 N-m). Chain "drape" should be 2-5/8" ±1/8" (6.7 ±0.3 cm) for retraction chains
and 5-5/8" ±1/8" (14.3 ±0.3 cm) for extension chains as shown. (Illustration C). Chain
"drape" for both extension chains and retraction chains should be as closely matched as
possible. Check the position of the retraction chain anchors through the inspection
windows (Illustration A). Number "2, 3 or 4" on the bottom of each retraction chain anchor
should be visible through the windows, but not necessarily centered or in line with each
other.
The chains should be inspected every 50 hours for proper adjustment and for signs of
excessive wear.
Courtesy of Crane.Market
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