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Allis Chalmers Discussion Forum
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G tractor I need help

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Mark F.

05-05-2005 10:18:10




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I am having trouble with my G hyraulic pump. The hand lever which engages the pump only moves about an inch. Also, the pin on top of the pump control does not move out of it's recess. There are (2) arched grooves on top of the pump control and it appears that the pin should slide in those grooves, but it does not move out of the recess hole. This pin has a spring and ball inside the control housing (that is what the book shows). Before I tear it all apart, I would like to know if the pin should slide in the grooves, or if it is fixed in place. Thanks Mark
Ps.. I have spend lots of $ and hundreds of hours in restoration.. This is the last item to be completed

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Plant Doctor

05-08-2005 06:20:42




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 Re: G tractor I need help in reply to Mark F., 05-05-2005 10:18:10  
Mark: I am not exactly sure of your question, but I hope this answers you. You say the hand lever only moves about one inch. Are you saying one inch up and one inch down or one inch total? If your tractor hasn't been used much and there is very little ware at the hand lever and valve lever connection, then approximately one inch of travel on the hand lever is about right. Regarding the pin on top of the pump, I think you are refering to the detent spring and ball located between the valve lever and the pump housing?? This spring and ball moves with the valve lever and the detent holds the valve lever in the neutral position. The control valve rotates and is fixed to the valve lever with a roll pin. You say there are ached grooves on top of the pump housing?? I THINK this groove you are describing is excessive ware and as I recall there is only suppose to be a small detent drilled into the pump housing and no ached groove. But with all this said, if the valve lever is connected to the control valve and is turning it when the hand lever is moved either up or down, then you should get oil flow and pressure to the hydraulic lift cylinder. You may want to check where the valve lever is connected to the control valve with a roll pin. I have seen this connection get lose and sloppy enough that the control valve would not rotate enough to work properly. I think you know that the shift lever that engages the belt pulley has to be engaged, this shift lever also engages the hydraulic pump. You can not have your foot on the clutch when operating the hydraulics. I hope this helps.

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A.Irvin

05-06-2005 16:48:30




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 Re: G tractor I need help in reply to Mark F., 05-05-2005 10:18:10  
Mark, My dad has a G with hydraulics in working condition. I will go and look and talk with him about your problem. It may take me a few days so I am responding to let you know I"m working on it. Check back next week and maybe I"ll have an answer for you!



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