M A E D A Mini-Crawler Crane Section 5 – INSPECTION
1/2019 MC285C-3 5-29
Check Over Winding Detector Operation
Review all procedures and safety precautions in
“CRANE SAFETY DEVICES” on page 4-51
before checking the over winding detector
operation.
WARNING! Lifting Hazard. If the over winding
detector does not operate correctly, contact
us or our sales service agency to request
inspection and repair service immediately. Do
not operate the machine until the problem has
been corrected.
To activate the over winding detector alarm (3),
raise the hook with the winch and extend the
boom to verify the alarm buzzer sounds and the
hook raising and boom extending operations stop.
Fig. 5-44
If any of the above fail to occur, the over winding
detector 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 to request
inspection and repair service.
Check the volume of the remote control system if
you do not hear the over winding detector alarm.
Check Moment Limiter Operation
Review all procedures and safety precautions in
“MOMENT LIMITER (OVERLOAD DETECTOR)”
on page 4-63 before checking moment limiter
operation.
WARNING! Lifting Hazard. If the moment
limiter does not operate correctly, contact us
or our sales service agency immediately. Do
not operate the machine until the problem has
been corrected.
1. Turn the Starter Switch to ON.
2. Verify the Working Status Lamp flashes in red
for 2 seconds and then green and yellow. The
subsequent lamp status will vary depending
on the crane status. For more information on
what the various lamp states mean, see
“Working status lamp states” on page 4-70.
3. Check the moment limiter display on the
monitor. Verify no error codes are displayed.
4. Start the engine and operate the crane as
follows to verify that the moment limiter
properly displays the value.
Crane Operation and Displayed
Parameter
Value Displayed on
Moment Limiter
Displayed boom length with the boom
length at minimum
Displayed boom length with the boom
length at maximum
Displayed working radius with the boom
length of 4.4 m and boom angle of 29.2
degrees
Displayed ACTUAL LOAD when the
weight of the known weight is hoisted:
Displayed slew angle at boom storage
position
Displayed slew angle when opposite
boom storage position (travel stand side)
5. Operate the crane until the moment limiter
display indicates the boom length is 4.4 m for
booms no. 2 and no. 3 and boom angle is
29.2°, then measure the boom angle and
working radius.
If the measured value(s) do not match the
moment limiter display value, contact us or our
sales service agency to request inspection and
repair service.
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