Farm Equipment - 8070 piston pump stays on high pressure

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8070 piston pump stays on high pressure

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=170553
Printed Date: 23 Oct 2025 at 2:35am
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Topic: 8070 piston pump stays on high pressure

Posted By: 8070nc
Subject: 8070 piston pump stays on high pressure
Date Posted: 25 Apr 2020 at 8:27pm

I have a 1984 8070 sn 2856. It has 3 remotes. The problem I have is with a loaded cylinder in the raised position on the middle valve the pump stays on high pressure. Im thinking the pilot check is sticking or plugged. My question is can it be serviced with the valve on the tractor.

Thanks

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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor

Replies:

Posted By: MACK
Date Posted: 25 Apr 2020 at 10:09pm

Are you saying after your release the lever the pump stays at hi pressure? For how long? Could be stand by pressure is too hi. Close to 600, they some times want to go to hi pressure. MACK

Posted By: 8070nc
Date Posted: 26 Apr 2020 at 8:49am

Thanks Mack

With no implement hooked up it acts normal. Hook up the disk and raise it and the lever pops back to hold the pump stays on high pressure. Without nothing hooked up if i activate a lever it returns to standby

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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor