Anti-Two Block Problem - PAT EI65 Troubleshooting Handbook

EI65 TROUBLESHOOTING HANDBOOK
3.2 ANTI TWO BLOCK PROBLEM
Check to see whether or not crane is in two-block condition.
Correct?
Check weight position. Refer to Operator's Section of Handbook 031-300-190-015
Correct?
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.
Correct?
Yes
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PROBLEM: Function of Anti-Two-Block System is faulty.
START
No
Yes
Section 5. Pre-Operation Inspection, item 1, 2, and 3 for
switch weight positions for the main boom and extension.
No
Yes
Check the A2B circuit at the boom tip junction box.
No
Lower hook down into safe position
Position the weight properly.
Replace Anti-Two-Block switch.
Refer to Drawing 1 & 4 in Section 5. Drawings.
031-300-190-035 REVISION A 01/25/99
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