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M984A4 Crane Telescope In/out, Boom Down, Inop

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Hello,

 

 

     I have a M984A4 (NSN: 01-534-2245.) We're having issues with the crane. Originally the crane had a hydraulic leak from a worn hose underneath the crane. That hose was replaced, but then a different hose started to leak. The hydraulic oil was seeping through the body of the hose. That hose was replace, and then another hose started to leak through the body. That happened one more time, the hose was replaced and all the leaks had stopped.

 

     Now, the telescope in/out, and the boom down do not work. These do happen to be the valves that the above mentioned hoses were replaced on. We ended up replacing the telescope and boom valves, no fix.

 

     We replaced the emergency bypass solenoid, still same issue. As the mechanic was holding in the bypass button and using the controls, the emergency bypass solenoid failed and began leaking hydraulic fluid.

 

     The strange thing is that you can get it to telescope slightly in if lets say you hold the "telescope in" lever while slightly pushing on the "boom up" lever.

 

     We contacted our TACOM Rep. and they said they haven't heard of anything like this before.

 

     So right now, a new emergency bypass valve, Boom up/down valve, Telescope in/out valve, and matching hydraulic lines have been replaced.

 

     Any help, insight, or direction would be greatly appreciated. Thank you.


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