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Section 5 – 850 kg SEARCHER HOOK INSPECTION AND MAINTENANCE Mini-Crawler Crane M A E D A
5-80 3/2019 MC305C-3
Post-Start – After Starting Engine
CAUTION: The checkups described in this
section should be carried out after starting the
machine.
See "STARTING ENGINE" on page 4-15 and
later to execute the engine startup, travelling
operations, outrigger operations and crane
operations.
Moment Limiter for Operation (850 kg
Searcher Hook Mode)
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.
Check if moment limiter is set as 850 kg
searcher hook mode, and display in boom
length matches actual searcher hook offset
position.
For correct setting, see "Searcher Hook
offset position and mode display in boom
length window" on page 4-131.
4. Shift the fall mode selector switch on moment
limiter display unit to "850 kg Searcher hook
mode".
5. 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
3.7 m
Displayed "boom length"
with the boom length at
maximum
12.5 m
Displayed "working radius"
with the boom length of
5.9m and boom angle of
25°" SH1 5.7 ± 0.1 m
SH2 6.1 ± 0.1 m
SH3 5.8 ± 0.1 m
6. Check if displayed actual load value is equal
to the total weight of the load + the hoisting
accessory, when the weight of the known
load is hoisted. There may be slight error in
accuracy depending on boom condition.
7. Operate the crane until the moment limiter
display indicates the boom length is 5.9m and
boom angle is "25 degrees", then measure
the "boom angle" and "working radius".
If the measured value(s) differ from the
moment limiter display value, contact
MAEDA or MAEDA sales agency.
8. Lift up load and check if boom extending or
boom lowering operation is auto-stopped
when overloaded. If the operation is not
auto-stopped in overloaded condition, stop
using the machine and contact us or our
sales service agency.
This checking operation must be operated
slowly, and if machine does not auto-stop by
overloading, immediately stop the operation,
and perform recovery operation caused by
overloading.
NOTICE: When measuring actual working radius,
measure from hook offset position of searcher
hook