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Model B Hydralics

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Joe Westrich

10-29-2002 07:37:25

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I have an 1940 Allis Chalmers Model B. The hydraulics was very jerky. I suspected a stuck
valve and purchased a rebuilt pump.

It operates fine without load albeit slowly. With
a partial load it is still jerky and when full load is reached it will not operate at all. I have fluid coming out of pump. I bled the ram and hose. The control is opening fully.

I don't know what else to check.
Any advice?

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10-29-2002 13:00:21

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 Re: Model B Hydralics in reply to Joe Westrich, 10-29-2002 07:37:25  
Pull the pump back off and check the cam lobes that drive it. My friend has the same problem, and I had my pump start slowing down. Found the lifters had eaten into the cam lobes until the hard facing was gone, then ate further until the lift was too low. Remember pressure is a measure of resistance to flow - if there is no flow (such as gage installed and ram not) pressure will be OK. As soon as flow is required (ram hooked up and extending) the volume may be so low you get no pressure.

Cure is a new PTO shaft or weld, regrind, and harden. I fortunately had a spare shaft. Maybe someone knows the base circle and lift on the PTO cams?

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10-29-2002 10:16:42

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 Re: Model B Hydralics in reply to Joe Westrich, 10-29-2002 07:37:25  
Being a two piston pump, B-C hydraulcs range from jerky to rattling depending on how fast the engine is running. Low pressure could be caused by the intake valves not seating or problems in the relief valve. They are not terribly complicated to work on but if you are not familiar with the pumps, best get an Allis or I&T service manual.

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