Maeda MC815C, Operation Manual, Page: 392 / 426

382
[Adjustment of derrick wire rope]
1. Fully extend the fly jib derrick cylinder.
2. Loosen 4 pieces of bolt (51) of the boom stopper (50).
3. Loosen the lock nut (52), and adjust wire rope by the
adjusting nut (53), and set No.1 fly jib to horizontal.
• If No.1 fly jib is lower than horinzontal.
Tighten (clockwise) the adjusting nut (53).
• If No.1 fly jib is higher than horinzontal.
Loosen (counterclockwise) the adjusting nut (53).
NOTES
There are adjusting nuts (53) on both left and right sides, but
derrick wire rope is connected to just either one, so you can
adjust to horinzontal by using either one.
[4] INSPECTION OF MOMENT LIMITER
When an abnormality occurs in the moment limiter, immediately contact us or our sales service
agent.
1. Start the engine.
2. Check the tricolor revolving lights. All lights of the revolving lights are lit, then the green light turns on.
3. Check that no error codes are displayed on the monitor.
4. Operate the fly jib as the following, and check if the monitor display is correct.
Posture of fly jib and display item Monitor display
“Number of fly jib boom sections” display when fly jib is stowed R
“Number of fly jib boom sections” display when fly jib is fully retracted 1
“Number of fly jib boom sections” display when fly jib is fully extended 2
“Fly jib angle” display when fly jib is fully raised 0
“Fly jib angle” display when fly jib is fully lowered 60
5. Start the engine and operate the crane as follows. Then, check if the monitor display of the moment
limiter is correct.
Crane operation Moment limiter operation
When the main boom is lowered from the condition with
the main boom length of 6.1 m or greater, the fly jib angle
of 0 degree and the main boom angle of 50 degrees or
more.
• Overload alarm is issued and the buzzer
sounds intermittently
• Winding up hook, extending/lowering the
main boom, extending/retracting fly jib
and derricking fly jib operations are
automatically stopped
When load is hoisted with the condition with the main
boom length of 6.0 m or less, and the main boom angle of
less than 50 degrees.
• Overload alarm is issued and the buzzer
sounds intermittently
• Operations other than winding down hook
is stopped.