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Allis Chalmers Discussion Forum

troubleshooting G hydraulics

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03-15-2012 08:51:59

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Getting a G in the shop with poor hydraulic performance, and wonder if someone can help me dignose this beast. Hydraulics work, but only move an inch. I have adjusted what looks like a pressure relief valve in & out, no change.

It is not noisy, as in running out of oil.

I post a photo that shows the pump area. I did not fiddle with any other adjustments or drain plugs.

Does the pump share the transmission oil as a reservoir? The oil level seemed to be up to the required level in the trans.

Any advice appreciated. I have a manual on order, but I"d like to start thinking about it now.

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acken fromwis

03-25-2012 16:05:34

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 Re: troubleshooting G hydraulics in reply to ccaissie, 03-15-2012 08:51:59  
what did you find wrong with your hydraulics?

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03-25-2012 17:19:45

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 Re: troubleshooting G hydraulics in reply to acken fromwis, 03-25-2012 16:05:34  
I'm finishing up a Farmall Super A-V, and expect to see the G in a few days. When you say adjusting the pump, are you suggesting that a pressure relief is set too low?

That's going to be my first bunch of inspections and tests. Check open flow, check pressure, check relief, check suction line and fitting in case.

I'll report the procedure and the results when I get done. I expect that I'll have a good time with this little gem.

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04-05-2012 13:07:41

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 Re: troubleshooting G hydraulics in reply to ccaissie, 03-25-2012 17:19:45  
Got the G running well. Points were set at .035, carb and timing was all adjusted wrong.

Hydraulic pump had decent flow, but no pressure, and was missing the pressure relief ball. Lots of pressure now.

Trouble with the control valve. Every position moves the implements UP. Depressing the clutch disengages the pump, and the implements drop. Might have been what prompted someone to dig into it, losing the ball.

If I pull the control valve (pump has not been removed from tractor), will I find a blown seal or other bad part that needs replacing?

I can't see by any service manual drawing that there are o-rings internally, but it's not a great drawing.

Best source for Allis G parts? YT is short on variety.

Thanks, Colin

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acken fromwis

03-15-2012 15:32:17

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 Re: troubleshooting G hydraulics in reply to ccaissie, 03-15-2012 08:51:59  
Hydraulics is shared with transmisson. Take hose of off cylinder and run hydraulics and see how good oil flow is, save and put oil back into fill on tranmisson if oil is good.
If low flow than pump needs adjusting.

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