Manitowoc 18000, Руководство по техническому обслуживанию, Страница: 202 / 316

Reference
Only
BOOM 18000 SERVICE/MAINTENANCE MANUAL
4-6
Published 12-05-17, Control # 035-23
7. Adjust the boom stop.
PHYSICAL BOOM STOP
General
The physical boom stops ( Figure 4-4 ):
• Assist in stopping the boom smoothly at any angle
above 77°
• Assist in preventing the boom rigging from pulling the
boom back when traveling or setting loads with the
boom at any angle above 77°
• Assist in moving the boom forward when lowering the
boom from any angle above 77°
• Provide a physical stop at 89 °
Operation
See Figure 4-4 for the following procedure.
1. When boom is raised to 77°, springs in boom stop tubes
begin to compress.
2. As boom is raised higher, spring compression increases
to exert greater force against boom.
3. If for any reason boom is raised to 89°, boom stop
springs fully compress to provide a physical stop.
WARNING
Falling Attachment Hazard!
Physical boom stops must be installed and pinned in
working position 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.
FIGURE 4-4
Physical
Boom Stops
77°
Start of Spring Cushioning
89°
Physical Stop
Boom
Butt
18CSM4-101