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Allis Chalmers Discussion Forum
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what i found in pump after dissassembly.

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Rick Steele

09-11-2004 11:05:35




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steve, i completely dissassembled the pump. the only things i found was this: #1... the inner seal on the sleeve had a small knick in it. #2... spring washer that goes between the sleeve and the spacer was missing,(how important is this spring washer). #3.... their was 9 shims where your blow-up shows 1. eveidently someone has been in this thing before . i cleaned everything up and made sure they were smooth. their were no broken springs. so thats what i found. outside of the cam follower rollers being wore out as i described. won't put this thing back together till i hear something.

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Duey (IA)

09-12-2004 18:49:55




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 Re: what i found in pump after dissassembly. in reply to Rick Steele, 09-11-2004 11:05:35  
The hold position valve is located on top of the hydraulic pump, held in place by two small bolts. Behind the knurled adjustment screw are shims, o-ring seal, spring, valve ball, seat and the plunger. When the control lever is moved to the "lower" position on the quadrant, the cam inside the hold positioning valve pushes the plunger forward unseating the ball allowing the oil to return to the sump. When the control lever is moved up to the "hold" position, the plunger is retracted and the ball seats and "holds" the oil. If the ball does not seat well, the oil will seep past. Also if the "head" on the plunger is broken off, the plunger can't unseat the ball and no oil will flow back to the sump, causing any implement and the rear lift arms to stay in the raised position. Also the spring washer,you mentioned, tends to disintigrate and small pieces of this tend to bind up the movement of the sleeves and valves. This can cause the pump to become inoperable and or can cause the problem you posted earlier.

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Duey (IA)

09-12-2004 18:36:42




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 Re: what i found in pump after dissassembly. in reply to Rick Steele, 09-11-2004 11:05:35  
Rick,
The spring washer stops the rack of sleeves from chattering. The 9 shims are used to increase the output pressure.
Check out the tips on my web site.



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Sid

09-11-2004 20:03:06




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 Re: what i found in pump after dissassembly. in reply to Rick Steele, 09-11-2004 11:05:35  
Rick I know I typed a reply to you question the other day, it seems that I did not post it though. This is what I found when the lift arms on my WD would not lower,even with weight on them. I am not as good as writing an answer as showing but here goes anyway. Look under the tractor for the drawbar control rod. It is a flat curved piece that has a slot in the upper end. This is what sends the signal to the pump for the traction booster to operate. You will see where this connects to a lever,of sorts that goes into the pump control body. What happened on mine was, were this lever attaches to a rod that goes inside the control body had come loose. It did not fall off but allowed the rod to turn inside the control body. In effect it was calling for the traction control to lift and never released. I was lucky enough that there was a bur that let me have an idea as to how to position things back so the lever was on the right place on the rod and I just spot welded it and not more problems. If you have a mnaual there is a picture on page 30 of my owners manual that I hope will give you some idea as to what I am talking about. Hope this is of some help.

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steve(ill)

09-11-2004 18:53:34




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 Re: what i found in pump after dissassembly. in reply to Rick Steele, 09-11-2004 11:05:35  
the other STEVE must have supplied you a print. I am far from knowledgable on the WD hydraulics, but as i said before the rollers should effect teh volumn of the pump and probalby make it somewhat erratic. Im not sure a bad roller would cause the cylinder to not lower. i would think that is something "bad" in the valve such as the excess shims you mention. i would have guessed a "stuck" ball or broken spring type thing. best you can do now is to clean it up, reassemble and test. i would get a new set of rollers. im sure tht effects the capacity of the pump, if not the sticking problem.

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