Farm Equipment - 220 hyd. pump??

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220 hyd. 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=56451
Printed Date: 21 Aug 2025 at 6:06am
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Topic: 220 hyd. pump??

Posted By: Mike NEIN
Subject: 220 hyd. pump??
Date Posted: 06 Sep 2012 at 2:46pm

The 220 hyd. pump loses it's prime just as soon as I shut it off. I'll start it right back up and nothing. If I loosen the plug on top of the pump, it will prime and work all day but shut it off and it's gone. Where should I look or what needs done? Rebuild pump?

Thanks, Mike

Replies:

Posted By: Hurst
Date Posted: 06 Sep 2012 at 3:16pm

Front shaft seal, doughnut gaskets on suction line, gaskets on suction line, and the short stub hose on the suction line (on my 7000's engine mounted pump it is right behind the engine frame rail on the bottom of the hydraulic pump).

Hurst

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1979 Allis Chalmers 7000
5800 Hours

Posted By: MACK
Date Posted: 06 Sep 2012 at 9:30pm

Clean the screen in rear end where suction line comes out. MACK

Posted By: Mike NEIN
Date Posted: 07 Sep 2012 at 6:54am

When we changed the rear end and flushed the system out cleaned the screen and it still has done this. I just don't understand why you can run it all day shut it off start it right back up and you don't have any hydraulics, but the pto runs until you prime it.