Altec has learned that the electrohydraulic outrigger/tools control valve on AA755L and A-series aerial...
Altec technical service bulletin SIL 852 for 2010-2021 Altec Aerial Device and 2010-2021 Altec Digger Derrick.
- Bulletin number
- SIL 852
- Component
- Equipment
- Summary
- Altec has learned that the electrohydraulic outrigger/tools control valve on AA755L and A-series aerial devices and DLB, DMB, and D2/3/4000B series digger derricks could have the potential to produce a very small amount of flow into the lower tools circuit when the outriggers and tools mode is engaged. This can cause slow unintended movement of a tool such as a pole puller cylinder that is connected to the tool circuit. A blanking plug must be installed to prevent this issue. Inspect the outrigger/tools control valve using the Inspection Procedure. The inspection and repair are covered under the Altec Warranty Policy and can be performed by Altec, the customer, or the customer's warranty provider. Altec will perform the work for free at an Altec facility.
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