SERVICE
800D
5-28
Published 5-27-2018 Control # 039-06
TROUBLE DIAGNOSIS (continued)
CONDITION
POSSIBLE CAUSE
POSSIBLE SOLUTION
Boom chatters
during
extension/
retraction or
doesn’t
proportion
properly
• Boom sections need lubrication.
• Wear pads not shimmed correctly.
• Worn wear pads.
• Extension cables out of adjustment.
• Extend or retract cables broken.
• Grease boom.
• Reshim as described in boom assembly section.
• Replace pads.
• Readjust cables and tension properly.
• Disassemble and inspect and replace cables.
Boom will not
extend
• Proportioning cables not attached.
• Anti-two-block system shut down.
• Defective anti-two-block system.
• Reconnect, replace and/or adjust cables.
• Lower hook, and extend load.
• Check anti-two-block system; repair if defective.
Fo
r
Reference
Only
Summary of Contents for National Crane 800D
Page 1: ...Operator and Service Manual National Crane 800D F o r R e f e r e n c e O n l y ...
Page 4: ...F o r R e f e r e n c e O n l y ...
Page 252: ...SCHEMATICS 800D 2 Published 5 27 2018 Control 039 06 F o r R e f e r e n c e O n l y ...
Page 255: ...F o r R e f e r e n c e O n l y ...
Page 256: ...F o r R e f e r e n c e O n l y ...