Farm Equipment - 7020 Hydraulic Pump

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7020 Hydraulic Pump

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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=142283
Printed Date: 20 May 2025 at 12:28am
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Topic: 7020 Hydraulic Pump

Posted By: leader58
Subject: 7020 Hydraulic Pump
Date Posted: 08 Sep 2017 at 8:27pm

Has anyone ever had one of these rebuilt? My remotes have started to bounce like air is in them and i was told the pump is getting weak. Seems to get worse when hot. Raising and lowering a disc conditioner.

Replies:

Posted By: Orange Blood
Date Posted: 08 Sep 2017 at 8:43pm

Yes, it is very easy if you are detail oriented.

First question, is have you check pressures, both standby, and operating? Does this pressure fluctuate back and forth from standby to operating, while in operating mode? It may not be the pump, the pump may be being commanded via the sensing circuit to rapidly fluctuate pressures and flow, because of some problem elsewhere.

Do a flow test, and see if you really are getting air, (foamy oil) or just fluctuating pressures.

If you are really getting air, the first thing I would check/due, is put new o-rings on the back side of the swash plate trunnion bearing covers (about 1-1/2" inset round covers opposite sides of the pump) If those get loose, as I have seen them due, they pull air in from there. If you clean things up real well, you can do this easy repair right on the tractor

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Posted By: MACK
Date Posted: 08 Sep 2017 at 9:42pm

How is steering? Is it jerky at any time? Does three point come up smooth?
MACK

Posted By: leader58
Date Posted: 09 Sep 2017 at 5:04am

steering and three point work great

Posted By: MACK
Date Posted: 09 Sep 2017 at 6:26am

I would say cables need adjusted on remotes. MACK

Posted By: leader58
Date Posted: 09 Sep 2017 at 7:39pm

I assume you mean they are not opening fully?

Posted By: MACK
Date Posted: 09 Sep 2017 at 9:38pm

Yes. MACK