M A E D A Mini-Crawler Crane Section 5 – INSPECTION
3/2019 MC305C-3 5-23
Crane
• Look around and below the boom and post and
look for any oil leak or similar. Be especially
careful to check up the derrick cylinder and
lower part of the winch motor near the post. If
you find any abnormality, repair.
• Check each part of the post for cracks,
excessive deformation, contamination and
others. In addition, check bolts, nuts, pins and
piping joints for any looseness, drop, damage
and other matters. Be especially careful to
check for looseness of decelerator mounting
bolt of the post, slewing ring or slewing device. If
you find any abnormality, repair.
• Check each part of the boom for cracks,
excessive deformation, contamination and
others. In addition, check bolts, nuts, pins and
piping joints for any looseness, drop, damage
and other matters. Be especially careful to
check for excessive abrasion and damage of the
boom support pin or derrick support pin. If you
find any abnormality, repair.
• Check for excessive damage and deformity of
the over hoist weight wire rope of the over
winding detector at the tip of the boom. If there is
any abnormality, repair.
• Check for sagged electrical wire, loosened
connection and trace of burns. If you find any
abnormality, repair.
• Check if the boom angle limit switch works
properly or not. If any abnormality is found,
repair.
Wire Ropes
For more information on wire ropes, see "Wire
Rope" on page 5-66.
• Check the wire ropes for damage, deformation,
wear, twists, kinks, corrosion, etc. If you find any
abnormality, replace
• Check the bound condition of the wire rope ends.
If you find any loosened wire rope end, replace.
• Check for irregular winding of the wire ropes
(wind drum). If you find any irregular winding,
rewind.
• Check each section of wedge socket for cracks,
bent, damage, and wear on support pins. If you
find any abnormality, repair.
• Check each section of wedge socket for loose
bolts and the support pin retaining plate, loose
rope cloip, and loose rope wedge. If they are
loose, retighten them.
Hook Block
• Verify that the wire rope latch (1) functions
normally. If there is any abnormality, repair.
Fig. 5-29
• Rotate the hook and verify that the hook rotates
smoothly and that trunnion does not emit any
abnormal sound.
If there is any abnormality, repair.
• Check the hook for any crack or excessive
deformation.
If there is any abnormality, repair.
• If dimension a between the punch marks
punched on the hook became "105 mm or more"
or the hook lower part dimension b became
"49.5 mm or less", replace the hook.
Fig. 5-30
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