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24 160 19_0106E_Rev D.doc / 2005-06-27 / rk.
8. ANTI-TWO BLOCK PROBLEM
Check Bypass plug installed, if necessary
Refer to system wiring diagram.
PROBLEM: Function of Anti-Two-Block System is faulty.
START
Check to see whether or not crane is in two-block condition.
Correct? Lower hook down into safe position
Plug appropriate bypass plug into socket of
junction box.
Turn power off or disconnect wire from connection board X1:9 in central unit. Check wire
connections in boom nose box and measure the resistance at the boom nose box between
terminals 1 and 2 with a ohmmeter. This checks the function of the Anti-Two Block switch.
Switch closed = 0Ohms (weight installed)
Switch open => 1 Megaohm (weight removed)
Pug the bypass plug into the boom nose box.
Refer to system wiring diagram.
Replace Anti-Two-Block switch.
Refer to system wiring diagram.
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Correct?
Correct?
No
Yes
No
NO
YES
YES
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