7020 transmission brake
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=161485
Printed Date: 19 Jun 2025 at 4:50pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 7020 transmission brake
Posted By: Blustery Knoll Farm
Subject: 7020 transmission brake
Date Posted: 30 May 2019 at 10:26pm
My 7020 grinds going into gear cold. What is the appropriate way to adjust the transmission brake?
I have loosened the clamp on the clutch cable and pulled out all the slack and it still grinds. Am I not adjusting it properly, or is the trans brake bad?
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Replies:
Posted By: SteveM C/IL
Date Posted: 30 May 2019 at 10:38pm
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My 8070 has always tried to grind cold. I just wait a little longer to try and shift it. I think it might be normal. Warmed a little and it's fine.
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Posted By: Blustery Knoll Farm
Date Posted: 30 May 2019 at 10:59pm
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I'd think it was normal, except my 7040 will stop the tractor if it is in gear and I push the clutch pedal to the floor. It never grinds, as long as I push the pedal to the floor.
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Posted By: Moneypit
Date Posted: 31 May 2019 at 1:37am
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Replace the ends on the cable and maybe the cable. If there is to much wear in the ends it'll grind
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Posted By: MACK
Date Posted: 31 May 2019 at 6:51am
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Replace pivot bushing and pin. Make sure there is not a thick rug under clutch pedal. MACK
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Posted By: Lonn
Date Posted: 31 May 2019 at 7:07am
On my brother's 7030 the pin and bushings didn't look bad but after I replaced them the problem was solved. That's where I'd look next.
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Wink
I am a Russian Bot
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Posted By: Blustery Knoll Farm
Date Posted: 31 May 2019 at 8:01am
How far is the spool supposed to come out of the valve body when fully depressed? Pivot bushing is tight.
There's no rug in the cab, so that's not the problem.
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Posted By: DrAllis
Date Posted: 31 May 2019 at 8:19am
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Whenever I repaired a trans brake complaint, it was ALWAYS replace the two fork pivot bushings and the ball joint on the end of the cable, spray WD40 all over everything and adjust the cable to proper length (pull hard forward on the cable and tighten the U-bolt). If you still have trouble after doing all that, there is potentially a warped clutch disc/plate or tranny brake issue.
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Posted By: Blustery Knoll Farm
Date Posted: 31 May 2019 at 9:27am
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Previous owner said that he replaced the bushings a bit over a year ago. They feel tight.
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Posted By: DrAllis
Date Posted: 31 May 2019 at 10:00am
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Adjust the cable 1/8" TIGHTER yet. May have to use a prybar of some sort. Oil everything.
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Posted By: Blustery Knoll Farm
Date Posted: 31 May 2019 at 10:51am
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I adjusted it 1/8" shorter so that the fork was actually moving the plate on the spool a bit and there's no change.
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Posted By: Lonn
Date Posted: 31 May 2019 at 2:39pm
warped plates IMO
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Wink
I am a Russian Bot
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Posted By: Blustery Knoll Farm
Date Posted: 31 May 2019 at 8:34pm
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I guess I'll live with it for a while then. Just wanted to rule out adjustment as the culprit first. It works fine once it is warmed up.
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