Mini-Crawler Crane M A E D A Section 5 – FLY-JIB INSPECTION AND MAINTENANCE
1/2019 MC405C-3 5-85
Pre-Start – Before Starting Engine
Check the following in this section without
starting the engine and before starting work
every day.
Boom and Frame
• Check each part of the boom and frame for
cracks, excessive deformation, contamination
and others. In addition, check bolts, nuts and
pins for any looseness, drop, damage and
other matters. If you find any abnormality,
repair.
Wire Ropes
For more information, 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 loose wire rope ends,
replace.
Fly-jib Fix Bolts
DANGER! If any damage found on fly-jib fix
bolt, please exchange it to new one right
away.
Breakage of bolt will cause fly-jib to fall off.
• Check if there is any cracks, damage, or
squash on screw thread on threaded portion of
bolt.
If cracks, damage or squash on screw thread is
found, change the bolt to new one even it is
earlier than expected bolt life.
Electrical Wiring (Fuse Box)
WARNING! If fuses are brown frequently or if
you find the trace of a short circuit created in
the electrical wiring, be sure to find the cause
and fix the problem.
Check the fuse at the lower section of the
instrument panel for damage and meltdown and
if the fuse of specified capacity is being used.
If a fuse has melted down or the trace of an
open/short circuit is found in the electrical wiring,
ask us or our sales service agency for repair.
Fig. 5-200
Pre-Start – After Starting Engine
Check the followings in this section after starting
the engine and before starting work every day.
CAUTION: The checkups described in this
section should be carried out after starting
the machine.
See "STARTING ENGINE" on page 4-18 and
later to execute the engine startup, travelling
operations, outrigger operations and crane
operations.
Over Winding Detector
Over wind the hook block (1), and raise the hook
with winch and extend the boom, and verify that
the buzzer sounds and an audible message
saying "Over hoisted" is spoken, the hook raising
operation and boom extending operation should
stop.
If these events do not happen, the over winding
detector (2) may be faulty.
If the alarm does not stop, the over winding
detector may be faulty or the circuit may be open.
Ask us or our sales service agency for repair.
Fig. 5-201
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