7080 running warm
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=211274
Printed Date: 18 Sep 2026 at 7:32am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 7080 running warm
Posted By: dnel45
Subject: 7080 running warm
Date Posted: 05 Jun 2026 at 10:58am
| Have a 1981 7080, well maintained, 4500 hr tractor, pulling a 24’ 1300 field cultivator in low 80 degree temps, it wants to heat up on us. We power washed the radiator twice, coolant level is alright. Radiator was redone about 1000 hours ago. Seems like if we put it under a heavy load it wants to heat up. Light load it runs fine. Any thoughts? |
Replies:
Posted By: ryan(IN)
Date Posted: 05 Jun 2026 at 11:18am
|
How is the foam on the sides of the radiator? If missing fan will pull air from between side panels and radiator frame and will cause heating issues. ------------- ryan 1984 8070 FWA,1979 7060,1975 7040,1971 190,1960 D-17D,1957 D-14, 196? D-19G, 1975 5040,1971? 160,1994 R62 |
Posted By: DrAllis
Date Posted: 05 Jun 2026 at 11:25am
| Lots of thoughts. #1. Fan belts that are worn can slip even tho you may have them TIGHT. With the engine off, pull on a fan blade and see if the engine turns or just the fan. Fan belts cannot be near the bottom of any pulley or they can slip at full throttle. #2. Temp gauges are 40+ years old sometimes read higher than the actual temp is. I've installed many manual type gauges and left the one in the dash to compare and trust the mechanical gauge. #3. When I power wash a cooling package, it takes me a half a day (4 hrs) to do a good job. I use a 90 degree elbow on the end of my wand to direct the pressurized water better at the radiator core. I remove the radiator shroud and maybe the fan itself and lay them off to the side. I unbolt the A/C condensor and hang it by the hoses off to the left. I unbolt and pull both oil coolers forward so I can get in behind them to wash. And when I say wash, I mean both ways front to back and back to front. On a 7080 you actually might have to remove the air cleaner assembly to get a better aim at the lower radiator. This much I can assure you....that radiator ain't as clean as you think it is. When the shroud and fan are removed you can get at all the corners to get them cleaned out. You should be able to shine a trouble light thru the core everywhere. That cooling system was (technically) designed to maintain an engine temp of 100 degrees over ambient temperature at 180 HP loaded. So, on an 80 degree day, it should stay under 190 degrees if the engine HP is where it belongs and not overfueled. #4. A fresh pair of thermostats never hurt. #5. Lastly, the foam rubber strips on around the radiator MUST be there !!! So, we are talking to top tank, lower front tank and both sides of the radiator. When that foam is missing, the hot air that just left the fan can be pulled around and enter into the radiator again. How do you get any cooling using that hot air ?? You don't !! It needs to be coming in thru the grille shell screen. |
Posted By: SteveM C/IL
Date Posted: 05 Jun 2026 at 11:48am
| A new sending unit wouldn't hurt. The sender fails before the gauge in my experience. Also check temps on block, hoses,tanks t stat hsg,etc with an infrared gun to confirm temps. |
Posted By: Alvin M
Date Posted: 05 Jun 2026 at 12:03pm
| It has two thermostat if only one opens it will over heat under heavy load only |
Posted By: DrAllis
Date Posted: 05 Jun 2026 at 2:21pm
| There's always a chance the head gasket could be leaking and getting compression gases into the coolant...............BUT, one doesn't jump to that conclusion without exhausting all of these other possible causes. |
Posted By: dnel45
Date Posted: 05 Jun 2026 at 2:57pm
| We definitely didn’t go to the extent doc said for power washing, we will try that. I also ordered a new foam kit, it’s mostly in tact and still there but I could see light though a couple spots with the side sheets on. |
Posted By: tbran
Date Posted: 05 Jun 2026 at 10:50pm
|
Been there many times - Doc is right - it is always the radiator plugged. ------------- When told "it's not the money,it's the principle", remember, it's always the money.. |
Posted By: ranger43
Date Posted: 06 Jun 2026 at 11:07am
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I have been thinking about these tractors running warm. I have a 210 and 8070. The 210 after owning for 25 years started running warm. Had a local radiator shop fix pin hole in tank and boil out. Did all of the other things mentioned....water pump, fan belts, gauge, thermostat etc. problem solved. The 8070 FWA, PS is new to me this year. IT will run on the warm side if pushing it on 90 degrees ambient. I am sure it needs all of the above. I was curious though has anyone ever tried a custom aluminum radiator in the 8000 series??
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Posted By: 8070nc
Date Posted: 06 Jun 2026 at 1:25pm
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You can have your radiator recored. I dont know for sure but thinking out loud it might be a problem to have the upper tank made with with the recess for the air pipe ------------- 1984 80780 1957 D14 DES 300 with 25000 engine 616 tractor |
Posted By: ranger43
Date Posted: 06 Jun 2026 at 1:48pm
| Yeah, I was just wondering if the aluminum would transfer the heat more efficiently? |
Posted By: 8070nc
Date Posted: 06 Jun 2026 at 2:35pm
|
I cant say about the efficiency. Ive never had a problem with 7 or 8000 series tractors heating and we worked them. If they started moving the heat guage above what they usually ran at we stopped and washed out the radiator ------------- 1984 80780 1957 D14 DES 300 with 25000 engine 616 tractor |
Posted By: orangereborn
Date Posted: 06 Jun 2026 at 2:44pm
| What RPM you running?? |
Posted By: 8070nc
Date Posted: 06 Jun 2026 at 2:45pm
|
I know you know this but the other big thing is the belts. They wont turn the engine by turning the fan it will cause it to run warm ------------- 1984 80780 1957 D14 DES 300 with 25000 engine 616 tractor |
Posted By: 8070nc
Date Posted: 06 Jun 2026 at 2:46pm
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If they wont ------------- 1984 80780 1957 D14 DES 300 with 25000 engine 616 tractor |
Posted By: victoryallis
Date Posted: 07 Jun 2026 at 10:03pm
|
Doc is right on washing the rad. My 8030 had a warm spell. Took the rad out and laid it on sawhorses and hit it with a pressure washer the water ran out looking like mud all better after that. My 8760 struggled to cool took all two pearls could do to carry to the pickup. It was full of carbonate after I got it back I could carry it myself. ------------- 8030, 7060, six 6080’s grandpa’s D17, 8760, 8100, and 8970 Deere. |
Posted By: IBWD MIke
Date Posted: 08 Jun 2026 at 5:07am
| My C-70 grain truck was running hot last fall. Temps in the low 90's didn't help. Blew the radiator out, wow, couldn't believe how much dirt and crap there was in there! Had finished up hauling with tractors and wagons. Will take the garden hose to it this fall. Probably sell the truck. Just not enough acres to justify keeping it around. |
Posted By: HudCo
Date Posted: 08 Jun 2026 at 8:53am
| thanks doc on cleaning a radiator , i wish my customers would read read your post on that, 1 when they say well we sprayed the garden hose though the grill it looks clean |
Posted By: DrAllis
Date Posted: 08 Jun 2026 at 9:29am
| Back in 1983, I had a (new to me) customer who called and wanted me to quickly come and get his 7040 tractor and install a head gasket because it was overheating while chopping hay. It would go about 30 minutes and he'd have to stop and let it cool down and then go again. I didn't have time to do a "drive-by" head gasket installation and told him it would be 3 or 4 days before I could do what he wanted. I also told him it sounded very much like a dirty radiator core. Well. he got the local "Case Power and Equipment" store to put in his head gasket. They never did anything else. He chopped again for 30 minutes and the engine was hot. I got the call to come and get his tractor and install another head gasket as that was the problem. They didn't do something right. I then took him a tractor to rent/use and brought his 7040 to my shop. I did the 4 hr remove coolers/etc and power washed. The tractor was then put on the dyno to verify the fix, which it was. When I brought it back to the customer (he chopped a lot as in custom work) I waited for him to do the usual 30 minutes of chopping and everything stayed cool. He asked how bad did the head gasket look ?? I then told him it never got a head gasket. The radiator was very dirty like I told him a week earlier. |
Posted By: 8070nc
Date Posted: 08 Jun 2026 at 10:35am
|
Orangeborn asked about rpm. Ive seen youtube videos where the steering wheel holder was running a 7580 at 1700 rpm pulling a load. I dont understand the thought process if doing that. The poor tractor cant make power and will heat ------------- 1984 80780 1957 D14 DES 300 with 25000 engine 616 tractor |
Posted By: DrAllis
Date Posted: 11 Jun 2026 at 9:45pm
| I wonder if we got the 7080 to run cool or not ????? |
Posted By: 1480man
Date Posted: 24 Jun 2026 at 6:11am
| We had a JD 7520 that started running hot. Belts tight, full of coolant. It ended up being the fan pulleys were worn and the belts where sitting really low in the pulleys. Changed belts and pulleys and it cooled off. |
Posted By: DrAllis
Date Posted: 24 Jun 2026 at 6:39am
| Like so many posts on this site, there are multiple possible solutions to the problem. And like so many posts, a "we are fixed" response never comes, so that others on this site can learn. |
Posted By: Ed (Ont)
Date Posted: 24 Jun 2026 at 7:42pm
Yes. If you ask a question it would be nice to hear back regarding progress or lack of such. I know people are busy but a short update would be great. We fixed it or we have not had time to address the issue!! 
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Posted By: IBWD MIke
Date Posted: 27 Jun 2026 at 7:01am
| Have to agree with Doc and Ed. Always nice to have an update to the problem. I try hard to do that when I have questions. Sometimes it takes awhile to get to things though. |
Posted By: Straanger
Date Posted: 28 Jun 2026 at 12:22am
| OP hasn’t been back since June 17th. |
Posted By: SilverShoes
Date Posted: 30 Jun 2026 at 12:29pm
| Make sure your fuel shutoff cable isnt creeping closed on you. Have had that happen on a 7580 and it started running warm for no reason. |