Farm Equipment - 7040 Piston Pump Seal/Gerotor Pump

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7040 Piston Pump Seal/Gerotor Pump

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=206676
Printed Date: 12 May 2025 at 4:31pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 7040 Piston Pump Seal/Gerotor Pump

Posted By: joe
Subject: 7040 Piston Pump Seal/Gerotor Pump
Date Posted: 12 May 2025 at 7:27am

Good morning. Working on replacing the gerotor pump seal and pump drive shaft seal on a 7040. I'm seeing in the parts breakdown that some piston pumps have shaft seals, some don't. A preliminary look at my pump says it could have a seal, but currently doesn't. Should it? I'm also wondering about gerotor pump oring. I'm not talking about the 2 identical orings on the diameter of the gerotor pump, but the oring that sits on the face of the gerotor housing. Thank you

Replies:

Posted By: DrAllis
Date Posted: 12 May 2025 at 2:20pm

Piston pumps on tractors never had a shaft seal. Combine pumps did. If there is a gerotor pump Oring, it needs to be there. Wrap the gerotor pump shaft splines like a barber pole, one layer with slight overlap with good black electrical tape. Oil the tape and slide the seal over the splines now without damaging the seal.