Farm Equipment - 7000 allis chalmers tractor

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7000 allis chalmers tractor

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=33246
Printed Date: 18 Sep 2025 at 11:36am
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Topic: 7000 allis chalmers tractor

Posted By: Alan E.
Subject: 7000 allis chalmers tractor
Date Posted: 03 Jul 2011 at 12:00pm

pto and powershift does not hardly work got powersteering, took off hydraulic pressre line going into power director and blew air through and come right out vent on top shift power shift and put in gear and park air still goes through. HELP!

Replies:

Posted By: Hurst
Date Posted: 03 Jul 2011 at 12:21pm

Blown seal in the powershift clutch pack? You can take off the powershift valve body and use a rubber tipped air nozzle to pressureize each individual clutch pack and see what happens. Does it do the same thing no matter what gear you're in?

Hurst

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1979 Allis Chalmers 7000
5800 Hours

Posted By: Alan E.
Date Posted: 03 Jul 2011 at 1:18pm

does it in all powershift gears or are you talking 1234 gears.

Posted By: DrAllis
Date Posted: 03 Jul 2011 at 1:23pm

First....black belly or brown belly ??? Next, get a 300 psi gauge installed in the side of the PowerShift valve and measure the regulating pressure....needs to be 210-230 psi with clutch pedal up( in Park) and engine half throttle or more.

Posted By: Alan E.
Date Posted: 03 Jul 2011 at 1:34pm

Brown belly, did put gauge on and had about 40lbs. took pressure line aff at tee right before going into power dictory and put gauge on there with valve on line and ran right into hydraulic fill and proceeded to screw valve in went up to 300lbs and Quit.

Posted By: DrAllis
Date Posted: 03 Jul 2011 at 1:44pm

Sounds like a valve issue....broken spring, stuck pressure regulator, maybe a blown gasket, etc. Only so much one can do in chassis without taking the valve off and tearing it apart. There are several parts to the valve internally, and if you're going to do surgery yourself, you'd better pay close attention to how each and every part comes out or you'll be in worse trouble afterwards.

Posted By: Alan E.
Date Posted: 03 Jul 2011 at 2:18pm

could it be in pto instead of powershift. and what about the power director where you can screw some of them caps off and take out plungers and springs could anything be stuck open and letting oil go by. THANKS.

Posted By: DrAllis
Date Posted: 04 Jul 2011 at 7:08am

I'm not there looking at it, but I think you could disconnect both of those steel lines that are near the top and "cap" the nipples at the valve and see what happens. This would be removing the PTO clutch AND PTO brake from the valve circuitry. If no change, then the valve must have issues as the pressure it maintained by the valve.

Posted By: Hurst
Date Posted: 04 Jul 2011 at 11:34am

Hey Alan,

I have a service manual for the 7000, so if you need me to fax the pages for the valve body, just let me know. I'll need your serial number because there was a serial number break within the maroon belly if I remmeber correctly. Just shoot me a PM if you need this.

Hurst

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1979 Allis Chalmers 7000
5800 Hours