Maeda MC405C-3 - Check Moment Limiter Operation

Mini-Crawler Crane M A E D A Section 5 – INSPECTION
1/2019 MC405C-3 5-37
5. Verify that the crane smoothly slews
counterclockwise (left) when the slewing
lever (1) is operated to "LEFT" side (push
forward).
Also, verify that the crane smoothly slews
clockwise (right) when the slewing lever (1)
is operated to "RIGHT" side (pull toward
you).
When doing the above, check for any
abnormal sound emitted nearby the post.
If there is any abnormality, repair.
Fig. 5-79
Check Over Winding Detector Operation
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 stop.
If these events do not happen, 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.
Fig. 5-80
NOTICE: If you do not hear the message from
the speaker, check the volume of the remote
control system.
Check Moment Limiter Operation
WARNING! If you find any abnormality with
the moment limiter, immediately contact us or
our sales service agency.
1. Turn the starter switch to the "ON" position.
2. Check with the working status lamp. The red
of the lamp lights up for 2 seconds and then
the green lights up.
3. Check the moment limiter display unit.
Verify that no error code is displayed at the
"RATED TOTAL LOAD" display on the
display panel.
4. Start the engine and operate the crane as
follows to verify if 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
4.7 m
Displayed "boom length" with
the boom length at maximum
16.5 m
Displayed "working radius" with
the boom length of "7.7 m" (2-
row booms) and boom angle of
"60.5 °"
3.5 ± 0.1 m
Displayed "ACTUAL LOAD"
when the weight of the known
weight was hoisted
• Must be equal to the total
weight of weight + rigging
• Note that it may show some
errors depending on the boom
conditions.
Actual load
5. Operate the crane until the moment limiter
display values indicate the boom length is
"7.7 m" (booms (1) + (2)) and boom angle is
"60.5 degrees", then measure the "boom
angle" and "working radius.
If the measured value(s) differ from the
moment limiter display value, contact us or
our sales agency.