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Allis Chalmers Discussion Forum

7040 powershift

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Author  [Modern View]

09-21-2017 14:13:18

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Does anyone know if the pump that runs the powershift transmission is the same as the power director tractors? My pump is failing and the local salvage yard only has power director tractors and I didn't know if it used the same pump. Thanks ,

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09-22-2017 05:34:56

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 Re: 7040 powershift in reply to dairyman, 09-21-2017 14:13:18  
A good salvage yard should know the answer to that question. Yes, the pumps are the same between PS and PD, BUT, the later tractors had a little larger pump than the early tractors. If your pump is going bad, I'm sure whatever they have will be better than what you've got. What makes you think your's is going bad????????????????????

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09-22-2017 08:03:23

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 Re: 7040 powershift in reply to DrAllis, 09-22-2017 05:34:56  
I had the powershift rebuilt in February because of issues last fall where we were pulling a 15 ft tandem disc and the trans pressure light came on and the tractor quite moving. The shop that did the work rebuilt the mechanical side of the powershift and sent it back. Then this spring I experienced shifting issues and stalling in reverse so it went back to the shop again that time for what o was tiold was work on the shift valves. Used it to run the round baler this summer and would be fine until the fluid got up to temp and then the trans pressure light would come on so I put a gauge on it myself and cold it's reading 230 psi on the regulating valve but if you run it enough to get the trans pressure light to activate at full throttle the regulating pressure then reads 170 psi. With everything else that's been done I can't think of anything else it could be. And no I'm not happy that the tractor is still malfunctioning after 2 trips to the shop. Thanks for the info on the pumps. Dave

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