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Nebraskafarms 
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Location: Omaha, NE
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 Topic: 8070 FWA - Wrong Tires?
Posted: 01 Jan 2016 at 8:50pm |
I have a 8070 and just noticed something. I has 26" rims on the front and noticed in a prior post they show 24 and 28" as options not 26.. Not such a big deal if they are appropriate height for the Rear tires... But want to make sure they are. Rears are 18.4R38 and the Fronts have 420/85/26. If Im calculating that out correctly that makes I have 16.9R26's on the Front with 18.4R 38's on back. Help me out!! uploads/14834/8070.jpg
Edited by Nebraskafarms - 03 Jan 2016 at 2:47pm
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Acdiesel
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Posted: 01 Jan 2016 at 8:55pm |
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are you having trouble with the front wheel assist binding or trying to pop-out?
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D19 diesel,D17 diesel SER.3 D14 NF,D14 WF, D15 SER.II wf
D15 SER.2 DIESEL,D15 ser.II nf
D12 SER.I, D10 Ser.II
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Gmc,caterpillar
I'm a pharmacist (farm assist) with a PHD (post hole digger)
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Nebraskafarms
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Posted: 01 Jan 2016 at 9:10pm |
Just bought so no... when i drove it around didnt notice anything funny either nor did i think the front tires were taller proportionally compared to the rears. When i was looking through the fourms on here someone posted this so im a little nervous ... again this is on someone elses post .. Front Rear 13.6 x 28 18.4 x 38 14.9 x 28 20.8 x 38 or 18.4 x 42 14.9 x 24 16.9 x 38
Edited by Nebraskafarms - 03 Jan 2016 at 2:48pm
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Nebraskafarms
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Posted: 01 Jan 2016 at 9:25pm |
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Edited by Nebraskafarms - 01 Jan 2016 at 9:54pm
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jiminnd
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Posted: 01 Jan 2016 at 9:28pm |
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Could be 16.9 26 is the same height as 13.6 28, I don't know but I used 15'5 38 duals with 18.4 34s, maybe the circumphrense is the same, just a thought.
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1945 C, 1949 WF and WD, 1981 185, 1982 8030, unknown D14(nonrunner)
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eighty nine
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Posted: 01 Jan 2016 at 9:34pm |
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This link may help , rolling circumference chart. http://commercial.firestone.com/content/dam/bcs-sites/firestone/PDF/RCI.pdf
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Nebraskafarms
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Posted: 01 Jan 2016 at 9:51pm |
Edited by Nebraskafarms - 03 Jan 2016 at 1:56pm
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Gerald J.
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Posted: 01 Jan 2016 at 10:29pm |
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Tall tires on the front will make the fronts try to out pull the rears and the FWA drive won't survive that well. It will also tend to jump as the fronts slip occasionally.
Gerald J.
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ILGLEANER
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Posted: 01 Jan 2016 at 10:42pm |
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We bought an 8070 new with 20.8x 38s on the rear and 18.4x26 on front. Front always pulled a little more then the rear. It's still going and has never had the front end touched.
IG
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Education doesn't make you smart, it makes you educated.
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SHAMELESS
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Posted: 01 Jan 2016 at 10:45pm |
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NE Farms...did you get that one on Big Iron Auction?
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Nebraskafarms
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Posted: 01 Jan 2016 at 10:49pm |
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What your saying you have actually have matches/converts over right mine does not
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Nebraskafarms
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Posted: 01 Jan 2016 at 10:49pm |
yes I did ... were you bidding against me..haha?
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Unit3
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Posted: 01 Jan 2016 at 10:52pm |
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Ours are set up the same as ILGleaners. Ours both have diff lock in the front axle.
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2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C
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Nebraskafarms
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Posted: 01 Jan 2016 at 10:56pm |
Yes how IL Gleaners is setup and yours goes along with the appropriate tire height... mine does not according to tire calculators and the Owners manual
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ILGLEANER
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Posted: 01 Jan 2016 at 10:59pm |
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And they drag there ass going thru the field and look dumb ! What tire does it recommend for 20.8x42s on the rear ?
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Education doesn't make you smart, it makes you educated.
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Nebraskafarms
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Posted: 01 Jan 2016 at 11:06pm |
This is what the manual says according to a prior post Front Rear 13.6 x 28 18.4 x 38 14.9 x 28 20.8 x 38 or 18.4 x 42 14.9 x 24 16.9 x 38
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Nebraskafarms
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Posted: 01 Jan 2016 at 11:08pm |
Again what i have is 16.9R26's on the Front with 18.4R 38's on back.......... so around 2.5 inches Taller then what im seeing in the prior post as recommendations with those rears what are your guys thoughts? I didnt notice any pulling or anything when i test drove it or anything with the Front wheels on
Edited by Nebraskafarms - 03 Jan 2016 at 1:58pm
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427435
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Posted: 01 Jan 2016 at 11:44pm |
Engineering tried to have 2-3% more travel speed (lead) with the fronts compared to the rear (gearing and tire sizes figured in). This primarily was to help with turning. According to the Firestone Tire Data Book http://dawsontireservice.com/wp-content/uploads/2013/07/FirestoneAgTireDatabook.pdf the 16.9-26 has a 4% larger loaded radius than the 13.6-28. This would result in a 6-7% higher travel speed (lead). This will wear out front tires faster and won't help the life of the FWA drivetrain components. The clutch for the FWA will limit the torque to the front wheels, so you may not notice a problem on high traction surfaces. However, the clutch won't be happy doing that continuously either.
Edited by 427435 - 01 Jan 2016 at 11:46pm
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Mark
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Ignorance is curable-----stupidity is not.
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Nebraskafarms
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Posted: 02 Jan 2016 at 12:12am |
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Thats interesting... You confirmed what I was thinking and its appreciated. Now my question now become why do so many of these 8070's have 26" rims on them??? since atleast according to the one owners manual this was not a option for the front rims. Then another question you mention the 3% lead. if one was to put smaller tires on the front then what is called for in theory that would prolong the life of the MFWD but would also lead to less "help" when the 4wd is needed correct?
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dpower
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Posted: 02 Jan 2016 at 1:39am |
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That tractor was cheap on BIGIRON, cant believe they let it go for that. Congrats
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SHAMELESS
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Posted: 02 Jan 2016 at 4:07am |
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yes I was ya bum! lol....shucks...if i'da know'd that i'd a run it up more! lol...well...if ya drives it home, you'll prolly drive past my place!
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SHAMELESS
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Posted: 02 Jan 2016 at 4:11am |
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the rules is Dpower...ya gits what ya gits on their auctions...I know sum of them fudge, but if they gits caught...well I don't know what they can do about it!
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SHAMELESS
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Posted: 02 Jan 2016 at 4:12am |
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you shoulda bid on it Dpower!
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DrAllis
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Posted: 02 Jan 2016 at 6:04am |
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I know I've sold 8070's before with 20.8 x 38's on the rear and 16.9 x 26's on the front or maybe it was 18.4 x 26's. Anyway, it was in 1985 model year and probably wasn't in the Owners manual yet....by Fall of 1985 it was all over............
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Peterson
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Posted: 02 Jan 2016 at 6:15am |
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To make a long story short, Allis was wrong with putting the 18.4-26's on the front with 20.8-38's. They are to tall. Correct tire size with 18.4-38's are a 13.6-28, or a 14.9-26 if that size is even available. 20.8-38's would be 14.9-28 or 16.9-26. 20.8-42's would take a 16.9-28 or 18.4-26. We put 20.8-42's on our 8050 and I went over all the tire sizes with the tire dealer to find the correct height.
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7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2
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Leon B MO
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Posted: 02 Jan 2016 at 6:58am |
We run 13.6x28 fronts with 18.4x38 with duals on the rear of our 8050, always have. 6500 hours and never been in the front end. Leon B
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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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WD45
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Posted: 02 Jan 2016 at 7:57am |
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Our 8030 had 20:8x38 with 14:9x28 on front.
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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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Nebraskafarms
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Posted: 02 Jan 2016 at 9:25am |
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Appreciate all your guys help and thoughts.... Was any of you the 2nd to last bid? This was actually the first time I ever bid on anything at a farm auction (that was over 100 bucks). So bidding one time and winning was kind of unexpected. My dads first cab tractor was a 7030 that he bought in the mid 80's and he always was interested in getting one of the 8000 series but ended up settling on a all green line up..ha I do think the tractor is a solid good tractor that has the MFWD rebuilt not long ago
Edited by Nebraskafarms - 04 Jan 2016 at 9:40pm
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Peterson
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Posted: 02 Jan 2016 at 9:50am |
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That would be my guess. Our 8050's front was wore out from the oversized tires too. Find yourself either a set of 13.6-28's or put some 20.8-38's on the rear.
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7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2
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dpower
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Posted: 02 Jan 2016 at 10:33am |
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You did good. Neighbor sold his 8050 two wheel drive last year and it brought 26000. It was rough to and needed work
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