EI65 TROUBLESHOOTING HANDBOOK
031-300-190-035 REVISION A 01/25/99
5
3.2 ANTI TWO BLOCK PROBLEM
Check weight position. Refer to Operator's Section of Handbook 031-300-190-015
Section 5. Pre-Operation Inspection, item 1, 2, and 3 for
switch weight positions for the main boom and extension.
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
Position the weight properly.
Check the A2B circuit at the boom tip junction box.
With power off, measure A2B signal in the j-box between terminals 5 & 6.
With the bypass plugs and switch weight in position the ohm meter reads 4.7K ohms.
Refer to Drawing 4, Anti-Two Block Circuit, Section 5. Drawings.
Replace Anti-Two-Block switch.
Refer to Drawing 1 & 4 in Section 5. Drawings.
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Correct?
Correct?
No
Yes
No
No
Yes
Yes