Allis B hydraulic pump leak
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=175476
Printed Date: 27 Aug 2025 at 10:32pm
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Topic: Allis B hydraulic pump leak
Posted By: ac55tractor
Subject: Allis B hydraulic pump leak
Date Posted: 26 Oct 2020 at 12:58pm
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Hi All On my 1955 Allis B's hydraulic pump there are three hex bolts on the top of the pump. There is oil seeping out of one or more of them. I am not sure if trying to tightening them will do any damage or throw off any adjustment. I did not want to open a can of worms, by messing with something that I am not 100% clear about. Thanks Steve Raymond, Maine
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Replies:
Posted By: TMiller/NC
Date Posted: 26 Oct 2020 at 3:05pm
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The 2 near the where the pump mounts are 9/16" X 18 thd, and seal with the copper gasket. These are over the discharge valves. The 3rd near the control is 1/4" npt it is over the relief valve. Use a wrap of teflon tape on these threads careful to not get any over the end of plug. Do not over tighten the pipe plug. No problem to remove any of these with the engine off and lift down. Tim |
Posted By: ac55tractor
Date Posted: 26 Oct 2020 at 3:48pm
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Tim, Thank you for the response. My guess is that the 1/4" plug is for an additional hydraulic cylinder. Do you know if was there some sort of an attachment for those 9/16" X 18 NF threads? I have had my tractor for almost 30 years. I am still learning about it. Steve
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Posted By: steve(ill)
Date Posted: 26 Oct 2020 at 3:56pm
The two with BOLT HEADS ( item 5) have a copper washer under them item 31) .. As TIM said.... You can get new washers at NAPA... or you can heat them up with a propane torch, let them cool and they should be soft to use again... the other one is a pipe plug-- thread tape. ------------- Like them all, but love the "B"s. |