Maeda MC405C-3 - Crane; Hook Block; Outriggers; Wire Ropes

Mini-Crawler Crane M A E D A Section 5 – INSPECTION
1/2019 MC405C-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 winding weight wire rope of the
overwinding alarm device 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.
Wire Ropes
For more informationo on wire ropes, see "Wire
Rope" on page 5-65.
• 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.
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
Outriggers
• Look below each of the outriggers and check
for any oil leak or similar. Be especially careful
to check below the outrigger cylinders. If you
find any abnormality, repair.
• Check each of the rotaries, outriggers, holders
and outrigger cylinders for cracks, excessive
deformation, contamination and others. In
addition, check bolts, nuts, pins and piping
joints for any looseness, drop, damage and
other matters. If you find any abnormality,
repair.
• Check for sagged electrical wire, loosened
connection and trace of burns. If you find any
abnormality, repair.
• Pull out the position pin of each of the
outriggers, rotate the relevant rotary and verify
that the operation is smooth. If you find any
abnormality, repair.