Manitowoc Published 09-05-14, Control # 226-02 4-5
14000 SERVICE MANUAL BOOM
PHYSICAL BOOM STOP
See Figure 4-3 for following procedure.
Two physical boom stops serve the following purposes:
• Assist in stopping boom smoothly at any angle above
77.6°.
• Assist in preventing boom rigging from pulling boom
back when traveling or setting loads with boom at any
angle above 77.6°.
• Assist in moving boom forward when lowering boom
from any angle above 77.6°.
• Provide a physical stop at 89.5°.
Operation
When boom is raised to 77.6°, springs in boom stop tubes
begin to compress.
As boom is raised higher, spring compression increases to
exert greater force against boom.
If for any reason boom is raised to 89.5°, boom stop springs
fully compress to provide a physical stop.
Adjustment
Struts (3) have slotted ends that do not require adjustment.
WARNING
Physical boom stops must be installed for all crane
operations.
Physical boom stops do not automatically stop boom at
maximum operating angle. Boom stop limit switch must
be installed and properly adjusted.
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