8070 fwa rear axles
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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=31155
Printed Date: 09 Mar 2025 at 8:51pm
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Topic: 8070 fwa rear axles
Posted By: plowboy8550
Subject: 8070 fwa rear axles
Date Posted: 22 May 2011 at 2:05pm
| Has anyone had troubles with the rear axles breaking. We have broken both sides now and we havent pulled the tractor that hard. We are the second owners, and it pulled a 25 ft disc when the first owner had it, so its had an easy life. I know the 7080 axles are different, but can they work and if so is there much of an advantage?? thanks matt |
Replies:
Posted By: DrAllis
Date Posted: 22 May 2011 at 3:52pm
| Never heard of it. Like so many posts, not much detail to go by. If the tractor has dual or triple rear wheels that are aired up too high on the outer tires and weighted down to 20,000 lbs or more, I could maybe see something happening over time. Heavy 3pt hitch use with duals/triples with tooo much air would aggrevate the situation. 7080's/8070's 2WD had 4 inch diameter axles and yours are 3 3/4 inch. |
Posted By: plowboy8550
Date Posted: 22 May 2011 at 4:37pm
|
Axle mount duals on back 2 weights on each side and tires are 75% full of fluid. Not much 3pt hitch usage at all. I was just curious if you could switch the axles and housings from a 7080 on it. The gears are wider on the 7080 from what i have read, but would it be possible to use them.. This one has given us some problems its within the last 100 made and we have been through the rearend both axles and powershift tranny. We have another earlier 8070 fwa that pulls the same implements and with the same people operating and it has not given us the first bit of trouble.. Both machines have around 4000 hrs. |
Posted By: DrAllis
Date Posted: 22 May 2011 at 5:46pm
| Cannot use the complete 7080/8070 2WD axle/final drive assembly....gearing is considerably slower and then your front axle ratio will be too fast.....can maybe/probably use a 7080/8070 2WD axle shaft and housing and couple it to the 8050 final drive components. |
Posted By: MACK
Date Posted: 22 May 2011 at 9:36pm
| I'm with Dr. Allis, Have never saw 70 series break a axel. MACK |
Posted By: DrAllis
Date Posted: 23 May 2011 at 6:17am
| I know for my own information, I'd have the broken axle(s) Rockwell hardness tested and then test the replacement axle for comparison. I suppose there's always a chance the heat-trest process didn't turn out correctly. My local machine shop has a tester. Again, I've never seen a broken axle on any 7010-20-30-40-45-50-60-80-8010-30-50-70. |
Posted By: Lonn
Date Posted: 23 May 2011 at 10:41am
|
I know of only one 7000 series that broke an axle in all my life and it was a 7060 with long axles and the inside dual was flat and they didn't know it. We always ran our outside duals at about half the air pressure. That way if an inside dual goes low you would notice just looking at it. ------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
Posted By: plowboy8550
Date Posted: 23 May 2011 at 1:44pm
|
I will get the axles tested.. We have 38 other allis tractors from a wc to a 8550 and this is the only tractor we have ever broke an axle on in the 70 yrs that we have been running allis tractors. We are a little puzzeled by this as well its just odd that both sides broke within 4 yrs of each other. We are lucky enough to have a bunch of rearends, planetaries, axles and transmissions from allis. I got them from Wabash Valley in Mt carmel Ill where i went to college. Allis donated them so students could learn on them. We also got a 7080 engine with a powershift powertrain coupled togather I guess its something they had in the works. Thanks for the help
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Posted By: Kcgrain
Date Posted: 23 May 2011 at 3:03pm
| Use to be a saleman that stopped here who use to say there are people out there that can even bust a hammer, and the previous owner of that 8070 might have been the guy. Have been around Allis CHalmers since 1970 and have never seen an allis axle break, ever, so yours would go into the record book. |
Posted By: Daehler
Date Posted: 23 May 2011 at 6:50pm
|
A neighbor I have had a 7040 that he broke both axles in, pulled a scraper with it and the axle duals were wider than the scraper and thats what broke them. Other than that, its the only one that I've heard of breaking axles. ------------- 8070FWA,7080 BlackBelly, 7045,2 200s,D19,D17,G, WD,45,UC,7 AC mowers and lots more! "IT TAKES 3 JD's TO OUT DO AN ALLIS, 2 TO MATCH IT IN THE FIELD AND 1 FOR PARTS!" |
Posted By: victoryallis
Date Posted: 23 May 2011 at 9:39pm
|
Neighbor broke an axle on his Deere few years back because his outer dual had a slow leak and he would air it up alot harder than the inner tire so he would not have to air it up as often. Sort of backfired on him. |
Posted By: Steve M C/IL
Date Posted: 23 May 2011 at 11:00pm
| So,in light of all this talk I should run my wide space axle duals on my 8070 a little lower than the inside tires? What's the difference supposed to be? 10 lb or what? |
Posted By: Lonn
Date Posted: 24 May 2011 at 5:57am
Run at about half or a little more than half of the pressure you run your inside tires at. That's what I do. Also move both wheels in as far as you can. ------------- -- --- .... .- -- -- .- -.. / .-- .- ... / .- / -- ..- .-. -.. . .-. .. -. --. / -.-. .... .. .-.. -.. / .-. .- .--. .. ... - Wink I am a Russian Bot |
Steve M C/IL wrote: