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Model C hydraulic problem
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John426 View Drop Down
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Joined: 14 Aug 2012
Location: France
Points: 312 		Post Options Post Options   Thanks (0) Thanks(0)   Quote John426 Quote  Post ReplyReply Direct Link To This Post Topic: Model C hydraulic problem
    Posted: 15 hours 48 minutes ago at 10:38am
Hi,

I had a problem with insufficient pressure in the hydraulic lift of my Allis Chalmers C. I replaced the weak discharge spring, which was too weak. Now I have the correct pressure, and the lift functions properly. However, it doesn't hold the load. The cylinder lowers as soon as I release the lever.
The entire pump was disassembled, cleaned, and the balls were replaced; everything seemed fine. There were no marks on the ball seats.
What could be the cause of this problem? 
Is there an adjustment I need to make?
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8681 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 13 hours 50 minutes ago at 12:36pm
not familiar with a C but sounds like an adjustment or simply not operating correctly. WD has a hold valve and linkage adjustments needed when not functioning properly.
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PaulB View Drop Down
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Joined: 12 Sep 2009
Location: Rocky Ridge Md
Points: 5163 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulB Quote  Post ReplyReply Direct Link To This Post Posted: 8 hours 57 minutes ago at 5:29pm
When rebuilding the pump, did you replace all of the ball seats? When you replace the seats, you need to take a NEW ball and use a good size punch and hammer to give the ball a solid WHACK. This will assure that the seat confirms to the roundness of the ball. Then that ball gets thrown away and a NEW ball is used on that seat. A new ball must be used in this process for every seat, and in turn that ball gets thrown away and then the next seat...  
If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 88554 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 7 hours 6 minutes ago at 7:20pm
i had that happen... NO HOLD... when the external friction plate and backer plate ( #33- #34) got stuck together.. I think that spring #14 ( external ) broke... This allows the SPOOL #12 inside to not seat on the flat spot on the shaft #13......  Work the outside plate and see that it moves free, the friction plate is not stuck to it, and it seems to "SEAT" when you release the plate.( feel the DETENT.... The "SEAT" is the relief spool #12  setting on the flat spot of the #13 shaft for the "HOLD - DETENT" position... If everything OUTSIDE is OK... You might have internal  problem with the spool / shaft  / seat face ..




Edited by steve(ill) - 7 hours 3 minutes ago at 7:23pm
Like them all, but love the "B"s.
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