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hi ok here is issue
we have a 1995 troy bilt gtx 20 with loader attachment (model 14066) the other night while plowing snow the loader stopped working was fine for hours.. there is no signs of leaks all hoses intacked. no leakage at pump, or control valve.. what would cause this and what should I do as a next step.. trying before next storm hits here in Massachusetts
 

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I presume the hydrostatic transmission is working, as is the power steering. If not, replace the hydraulic filter.

If the hydrostatic and power steering are working check the Lift and Auxiliary Valve (#209 on diagram):
https://www.manualslib.com/manual/183741/Troy-Bilt-13076-Gtx-20.html?page=24#manual

To check the lift valve crack open line #161 at either the Lift Valve or at the Control Unit (#157). Start the tractor and oil should squirt out under pressure. If it does, then tighten that fitting and loosen return line, trigger the valve #209 and watch for oil under pressure.

One or the other of these tests will have no oil under pressure.

No pressure from the Control Unit will indicate failure there. No pressure from the Auxiliary Valve places the problem in that valve.
 
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