SECTION 4 – BOOM
3120933 Rev. 0 USTC 4-13
12. Remove top and side wear pads from inside
nose end of outer-mid section.
13. Pull fly section from outer-mid section.
14. Inspect each boom section for straightness,
rubbing, cracks at welds. Inspect cables per the
cable inspection procedure.
15. If necessary, remove boom nose sheave retaining
rings and pins. Remove sheaves and inspect
sheaves and bushings for damage.
Boom Inspection
• Inspect upper and lower boom nose sheave pins
for tapering, ovality and scoring. Ensure that pin
surfaces are protected prior to installation. Re-
place pins as necessary.
• Inspect upper and lower boom nose sheaves for
wear, ovality, scoring or other damage. Replace
sheaves as necessary.
• Inspect all sheaves (boom nose, extend and re-
tract cables) for excessive groove wear, burrs or
other damage. Replace sheaves as necessary.
• Inspect extend and retract cable sheave pins for
scoring, tapering, ovality and evidence of correct
lubrication. Replace pins as necessary.
Fly Section
Inner-Mid
Section
Outer-Mid
Section
Cable Anchor
Fly Extend
Cables
Fly Extend
Cables
Fly Extend
Cables
Fly Retract
Cables
Fly Retract
Cables
Outer-Mid
Retract Cables
Fly Retract
Cables
Retainer
Plates
Figure 4-10. Inner-Mid, Outer-Mid and Fly Sections
Courtesy of Crane.Market
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