Farm Equipment - 7040 PD transferring oil

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7040 PD transferring oil

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=140239
Printed Date: 16 Sep 2025 at 1:14pm
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Topic: 7040 PD transferring oil

Posted By: Erichpost1
Subject: 7040 PD transferring oil
Date Posted: 08 Jul 2017 at 6:15pm

I have 1974 7040 with a power director it is transferring oil from the transmission to the hydraulic tank I replaced the seal and o rings in the dual pump so where and how is it getting transferred thanks in advance

Replies:

Posted By: LB0442
Date Posted: 09 Jul 2017 at 5:53pm

Welcome to the forum. Most of the time it is the gear pump seal, the one I believe you replaced already. Also the driveshaft seal for the pumps is a very common one to transfer oil. Unfortunately you have to pull the pumps back out and drain the rear end also to replace that seal. Usually try to do them at the same time.

Posted By: DrAllis
Date Posted: 10 Jul 2017 at 7:22am

Installation of the pumps gerotor seal is easy to damage the new seal if you don't tightly wrap the splines on the shaft with a single barber pole layer of black electrical tape. Just sliding the seal over the shaft may cut the seal when passing over the splines.