Manitowoc Published 05-09-17, Control # 014-28 4-7
16000 SERVICE/MAINTENANCE MANUAL BOOM
PHYSICAL BOOM STOP
See Figure 4-4 for the following procedure.
Physical Boom Stop Angles
The physical boom stops serve the following purposes:
• Assist in stopping the boom smoothly at any angle
above 77.9°.
• Assist in preventing the boom rigging from pulling the
boom back when traveling or setting loads with the
boom at any angle above 77.9°.
• Assist in moving the boom forward when lowering the
boom from any angle above 77.9°.
• Provide a physical stop at 88.9°.
Operation
1. When the boom is raised to 77.9°, springs in the boom
stop tubes begin to compress.
2. As the boom is raised higher, spring compression
increases to exert greater force against the boom.
3. If for any reason the boom is raised to 88.9°, the boom
stop springs fully compress to provide a physical stop.
Adjustment
1. Raise boom butt (1, View A) until boom stop rollers (4)
just contact saddles (5, View C) on rotating bed.
2. Adjust rod ends (3a, View B) so gap between rollers (4)
and bottom of saddles is at dimension shown in View C.
3. Securely tighten jam nuts (3b).
WARNING
Physical boom stops must be installed for all crane
operations.
Physical boom stops do not automatically stop boom at
maximum operating angle. Automatic boom stop must be
installed and properly adjusted.
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