D-17 Series 4 Hydraulic Pump Leak
Printed From: Unofficial Allis
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=211259
Printed Date: 07 Oct 2026 at 9:35pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: D-17 Series 4 Hydraulic Pump Leak
Posted By: knotle
Subject: D-17 Series 4 Hydraulic Pump Leak
Date Posted: 03 Jun 2026 at 12:15pm
Have a leak at front hose. Leak is where hex head screws into pump housing. Is there an o-ring behind there that could be replaced? Thanks for any info.
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Replies:
Posted By: Alvin M
Date Posted: 03 Jun 2026 at 2:17pm
| Yes O Ring |
Posted By: knotle
Date Posted: 03 Jun 2026 at 2:45pm
| Thanks. Thought that might be the case. Would you happen to know the o-ring size? |
Posted By: DrAllis
Date Posted: 03 Jun 2026 at 3:07pm
| it is a standard O-Ring Boss (ORB) to roll on that fitting. It also must be of a hardness to withstand 2400 PSI of pressure. A cheap hardware store Oring will generally be too soft and blow out quickly. Take the fitting to ANY farm implement dealership and they can fix you up. It is not metric. |
Posted By: knotle
Date Posted: 03 Jun 2026 at 5:54pm
| Thanks for your help. |