8070 powershift
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=166832
Printed Date: 07 Apr 2026 at 11:36am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 8070 powershift
Posted By: cowkicker
Subject: 8070 powershift
Date Posted: 21 Dec 2019 at 6:02pm
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Any idea why an 8070 would loose 4th and reverse at the same time? Putting out hay today and shifted to 4th and had nothing, then went to reverse and it would barely move backwards, barely put your foot or the brake is enough to stop it. 8000 hour tractor, mostly used feeding, never any trans issues. Also have a good low hour 7020 power shift , would it be a direct bolt-in replacement, need to get it going ASAP.
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Replies:
Posted By: Leon B MO
Date Posted: 21 Dec 2019 at 6:42pm
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Our 8050 ps lost all but 2nd and reverse was bairly there. Nut had come loose on input shaft. Take fuel tank and shift valve body off, ours, you could move shaft up and down a 1/2 inch. At that point you know it needs split in two places. Not sure about putting a 7020 in without mods. Good luck. Leon B Mo
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Uncle always said "Fill the back of the shovel and the front will take care of itself".
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Posted By: MACK
Date Posted: 21 Dec 2019 at 10:11pm
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I believe there are some differences in mounting bolt pattern for cab. MACK
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Posted By: tbran
Date Posted: 23 Dec 2019 at 1:20pm
- it is doable - but you are looking 40 plus hours...if it your first time.... there will have to be some fabrication for mounts.. you have lost B2 and C2 clutch pacs - almost impossible for both to go out at same time - get a service manual and air test B2 and C2 - I would remove the valve plate / shift cover and listen for air leakage and also check the valves to see if they are stuck.. if you do not have a RH fuel tank it is a 30 min job. If you do have a RH tank you will have to loosen and swing it away to access the shift plate and remove it. While down there look at the housings and how the cab mounts... there are more differences 'tween FWA and non FWA as to hyd hook ups..
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: WD45
Date Posted: 23 Dec 2019 at 5:33pm
Anyone have a service manual for an 8070 for sale.
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Fred Dunlop, G,B,CA, WC,WF, 3 WD45`s,gas, diesel and LP,U,D10 series III, D12,D14,D15 SERIES II,D17 Series IV in Gas and Diesel ,D19 GAS and D21,170 185,210 ,220 an I-600 8070 fwd, 716H and 1920H
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Posted By: cowkicker
Date Posted: 23 Dec 2019 at 5:59pm
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Forgot to mention also hyd oil started leaking out of front of trans housing. Everything happened pretty much at once. Will do some checking before starting to tear it apart. I have rebuilt 2 others but that was in the 90s. Been trying to remember why, seems one of them had some broken bolts that held the rear clutch pack together, does that make sense? Also seem to remember that in one that I had to drill some mounting holes larger and rethread them in a gear, think I did something like that or am I thinking of something else? Did Allis ever recommend slighty enlarging holes in the clutch pack to allow oil to enter a bit faster? Like I said earlier, it has been nearly 30 years since I have been inside one of them and all of us older folks know about our memory!!!!!
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Posted By: DrAllis
Date Posted: 23 Dec 2019 at 6:02pm
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The fact that it started leaking out the bellhousing is a good indication of the nut coming loose.
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Posted By: Chevy4x4
Date Posted: 23 Dec 2019 at 8:23pm
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They had trouble with the bolts holding the gears on. Allis fix was to replace gears and housing we had the gears drilled bigger and Taped the housing out bigger. Takes a special bit to drill Gears. See a machine shop. If the front housing is bad from the nut come loose and rough up the bore we got it sleeved like a engine cylinder and re drilled oil holes. I have rebuilt about 12 of these and had good luck. The biggest trouble with this trains is the trans brake is too aggressive and should not be used to stop Tractor.
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