7020 Power Shift problems
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=176058
Printed Date: 10 Aug 2025 at 1:29pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 7020 Power Shift problems
Posted By: Country Strong
Subject: 7020 Power Shift problems
Date Posted: 17 Nov 2020 at 6:02pm
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Tractor would drive in reverse low but once u let off the clutch on 1 thru 4 it wanted to die. Read a old post on this forum where a person that goes by the handle of 'Dr. Allis' suggested to let it cool down and while not running shift several times from 1 thru 6th because the reverse plunger might be stuck. This worked. Tractor began to shift again, however there is still something wrong because I have driven this tractor for over 30 years. Please to all who have any experience with powershfift knowledge walk me through all the different mechanical steps to take to avoid splitting this ole girl. What worries me the most is I don't know of anyone in Tennessee who can work on allischalmers power shift transmissions. My first step was to change oil and filters/element
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Replies:
Posted By: DrAllis
Date Posted: 17 Nov 2020 at 6:49pm
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So, what I suggested worked that time?? That means there was a plunger stuck (down) in the Power Shift valve. This can be due to lack of oil and filter changes over the years. It can also be due to the plunger valve bores being rubbed on the top making them a little tight. A good cleaning of the Power Shift valve and dressing of these bores would solve that problem, along with an oil/filter change. What is it doing now ?? The same thing ??
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Posted By: DougG
Date Posted: 17 Nov 2020 at 7:26pm
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Used to be guys in Southern Ill. who rebuilt those- but havent seen nothing of them in a while
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Posted By: SteveM C/IL
Date Posted: 17 Nov 2020 at 7:57pm
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B&G Equipment in Paris TN. I'm positive Tim could fix it.
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Posted By: Country Strong
Date Posted: 17 Nov 2020 at 8:24pm
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Thank you so much for responding. That's what I had planned on doing this weekend 'changing oil and filters/element.' I will contact u on this forum after I accomplish this step and drive it. Q, would locking and unlocking the differential before I drive be of any help, and what about turning the pto on?
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Posted By: Country Strong
Date Posted: 17 Nov 2020 at 8:31pm
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Thank you for your response. If the basics don't work I'm sure I will be in contact with you again. Thank you.
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Posted By: MACK
Date Posted: 17 Nov 2020 at 8:51pm
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I would not waste the price of oil and filter. Get it in a shop for a rebuild. If a plunger stuck, there is damage to a clutch pack. Foreign material is all I have ever saw cause a plunger to stick. Foreign material usually comes from something coming apart. MACK
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Posted By: Tenn allis
Date Posted: 18 Nov 2020 at 5:30am
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Country strong I see your from van buren county. Give Tri county equipment in crossville a call. They have worked on my 8070 before and will work on any brand equipment although they are a jd dealer
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