Farm Equipment - Allis 400 loader

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Allis 400 loader

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=195794
Printed Date: 20 Sep 2025 at 6:54pm
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Topic: Allis 400 loader

Posted By: capn lonnie
Subject: Allis 400 loader
Date Posted: 21 Jun 2023 at 1:49pm

So when I put hydraulic fluid in my loader, it ends up transferring into the main housing and leaking through the overflow, and my loader stops functioning… there is a loader pump that mounts below the rear PTO shaft..is there a seal that could be bad, causing the fluid transfer? If so how difficult to repair? Thanks!

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'44 B '46 C '58 D-14 '78 5050

Replies:

Posted By: DSeries4
Date Posted: 21 Jun 2023 at 3:55pm

Which tractor? The 400 series loader usually had its own hydraulic reservoir in the left side upright support that was completely separate from the tractor.

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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '63 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080

Posted By: capn lonnie
Date Posted: 21 Jun 2023 at 4:25pm

Tractor is a 5050, and yes, the reservoir is in the support… the pump is mounted to the rear just under the PTO shaft

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'44 B '46 C '58 D-14 '78 5050

Posted By: DrAllis
Date Posted: 21 Jun 2023 at 4:59pm

Shaft seal on the pump. Pump shaft bearing/bushing may be bad. Might have to replace the whole pump.

Posted By: capn lonnie
Date Posted: 21 Jun 2023 at 6:48pm

Thanks, the pump seemed to be functioning properly with fluid, hopefully just the seal needs to be replaced

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'44 B '46 C '58 D-14 '78 5050