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3.18.3 HOOK RAISING/LOWERING OPERATION
BY OVER-HOISTING CANCEL SWITCH
• The Over-hoisting cancel switch cancels the auto-stop function of the over hoist detector.
Operate the right work equipment control lever carefully when stowing the hook block. Pay
sufficient attention not to let the hook block collide with the boom.
• Use this Over-hoisting cancel switch only when stowing the hook block into it’s temporary
stowage position in the boom tip.
Keep the normal winding operation and use the over-hoisting
cancel switch (4) in the switch box as follows:
• Release: Keep the button pushed and operate the right work
equipment control lever to HOOK RAISING (pull
backward) position. The hook block will be winched
for stowage to the boom tip. The pilot lamp inside the
switch lights, at this time.
• Auto: Release the finger from the button. It returns to the
previous position and the auto-stop function of
overwind detector will be enabled.
• When turning this Over-hoisting cancel switch (4) to the
"Release" position, the red lamp of the working status lamp will
light up.
• When the winch is hoisted while this Over-hoisting cancel
switch (4) is pushed, the winch speed is slower, however it is
not a winch failure.
[WINCH DRUM CHECK MIRROR]
The winch drum check mirror is provided below the winch
drum to facilitate to check for irregular winding of the wire
ropes from the operator's compartment.
Use this mirror to carefully check that the wire rope is
wound correctly, during winding operations.