It was found that the pinning after-position signal was missing for the 90% hole on telescope 4. All proximity switch and length sensor signal were checked under the condition.The boom pinning failed while retracting. On the second day in the afternoon we reached 90/90/90/90 percent and tried to retract to 0/0/0/0 percent. We had the crane operator telescoping out and in to different length combination using different length codes. Upon arrival we checked the reported failure, unfortunately the intermittent failure did not appear on the day of arrival.In most cases a service access code is required from Terex-Demag for safe operation of the telescope and to retract the boom for reset. At that point only a difficult manual operation allowed the telescope sections to retract. The PDC control system screen showed incorrect SVE locking together with control error codes. Our customer reported intermittent automatic boom locking and boom pinning failures after the boom was reworked. We assisted our client with their Terex – Demag AC 100 L repair in Louisiana. Terex – Demag AC 100 L Repair – Automatic Boom Locking and Pinning Failures
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