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Thread: M936A1 Boom not lowering

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    Tech M936A1 Boom not lowering

    Looking for some input on 1986 M936A1 wrecker, not booming down.

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    Anyone know how the oil routes thru crane control valve allowing boom elevating cylinders to retract?

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    Bad flow valve on the control handle. It should come back down on its own even with gravity with the valve open. The return flow hose may also be restricted

    Drop the cable down and secure it to the truck then cable to get a little pressure on it then pull the boom Down lever
    2008 F-250 6.4L Powerstroke
    1984 AM General M923A1 ( Big Cam III NTC-400, HT3B turbo, Intercooled, #15 button, Dual fuel Line setup - MRAP Aluminum Radiator - 8" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, Oshkosh 55000 Transfer Case, riding on 16.00 AT-3s on HEMTT wheels. )
    83' M923A1
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


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