Maeda MC285C-3 - Pre-Start - before Starting Engine; Boom Head, Frame and Hook; Position Pin and Lynch Pin; Wire Rope

M A E D A Mini-Crawler Crane Section 5 – AUXILIARY WINCH INSPECTION AND MAINTENANCE
1/2019 MC285C-3 5-79
Pre-Start – Before Starting Engine
Perform the following inspections daily before
starting the engine.
Boom Head, Frame and Hook
Check each part of the boom head, frame and
hook for cracks, excessive deformation and
contamination etc. In addition, check bolts nuts
and pins for any looseness, drop and damage etc.
If you find any abnormality, repair. Check hook for
deformation, abnormal noise from bearing and
correct function of wire rope latch (1).
Fig. 5-165
Position Pin and Lynch Pin
Check if position pin of boom head is surely
secured with lynch pin.
Wire Rope
Check for damage, deformation, wear, twists,
kinks and corrosion and replace where necessary.
Over Winding Detector
Check the wire rope of over- winding weight for
damage etc., and replace it as necessary.
Winch Motor
Check for loose pipe connections, oil leakage or
loose mounting bolts, and repair as necessary.
Winch Drum
Check the drum for cracks, bending or damage
and repair it as necessary. Check hoisting wire
rope for disorderly winding and repair it as
necessary.
Post-Start – After Starting Engine
CAUTION: The checkups described in this
section should be carried out after starting the
machine.
See “Starting the Engine” on page 4-20 and
later to execute the engine startup, travelling
operations, outrigger operations and crane
operations.
Over Winding Detector
Over hoist the hook block (1), and raise the hook
with winch and extend the boom, and verify that
the buzzer sounds, the hook raising operation and
boom extending operation 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.
Contact us or our sales service agency.
Fig. 5-166
Over-Unwinding Stop Device
Before carrying out underground lifting work, with
three loops of wire ropes left on winch drum,
operate hook lowering to test if alarm buzzer
sounds and hook lowering operation stops.
If these are not happening, Over-Unwinding Stop
Device may be broken.
If the alarm buzzer does not stop sounding,
Over-Unwinding Stop Device may have failure or
may have cut wiring.
Contact us or our sales service agency.