How hot is too hot?

   / How hot is too hot? #1  

kspring61

Silver Member
Joined
Sep 1, 2014
Messages
126
Location
Now Western TN
Tractor
Kioti DK40SE HST Ford 8N
Starting to mow my fields down here in TN. A little bit warmer than when I usually do it later in the year but need to get all the fields mowed since I will be out west most of all Sept.
Anyways after mowing a bit my temps are going up on the my DK40SE, I have attached a pic of the temp gauge (wish these had numbers on them). I am assuming the 2 dots are in the 190-200 range but that may be a bad assumption, anyone have any idea what temp those dots represent?
Am I running it too hot?

I just replaced the overflow reservoir, plenty of coolant in the radiator, but the coolant is due to be changed. I doubt that would make it run hot because of old coolant, I think old only affects the anti-corrosion effectivity of the coolant. Am I right?

I did bring the tractor back up to the shop and blow out the radiator and cooler from the engine/fan side out, plenty of dust came out. Could it be the radiator needs cleaning? If so what is the best way? I do have a cleaning nozzle (low pressure) that I use on my motorcycles and ATV's that has a good degreaser/cleaner soap attachment that I could use to spray in there and try to clean it out and rinse with a hose. Any other ideas?

Sorry for the rambling but just thinking out loud and looking for some suggestions

Thanks
IMG_2258.jpg
 
   / How hot is too hot? #2  

RjCorazza

Veteran Member
Joined
Apr 6, 2000
Messages
2,019
Location
Maryland
Tractor
Kubota L4060 Cab, ZD1211, ZD326
Almost certainly the result of the dirt in the radiator fins. I blow the radiator out on my ZD mowers after every use, the tractor once in a while.
Blow out what you can, then flush the exterior with water. I've never used soap or other cleaners, but I suspect it would help.
They also make a water tool for radiators that appear very convenient.
 
  • Good Post
Reactions: JJT
   / How hot is too hot? #3  

DK35vince

Super Member
Joined
Feb 5, 2002
Messages
6,345
Location
western,pa.
Tractor
Kioti DK 35
I'm guessing the 2 dots represent normal operating temperature.
Your running a little high on temp, but not to bad.
Cleaning the radiator fins very well might help.
 
   / How hot is too hot? #4  

4570Man

Super Star Member
Joined
Apr 7, 2015
Messages
16,584
Location
Crossville, TN
Tractor
Kubota M59, Kubota L3800, Grasshopper 428D, Topkick dump truck, 3500 dump truck, 10 ton trailer, more lighter trailers.
Mowing will clog a radiator pretty fast. Blow it out and I’d say your problem will be fixed.
 
   / How hot is too hot? #5  

jmc

Elite Member
Joined
Jul 21, 2003
Messages
2,808
Location
SW Indiana
Tractor
Ford 1920 4x4 (traded in on Kubota). Case 480F TLB w/4 in 1 bucket, 4x4. Gehl CTL60 tracked loader, Kubota L4330 GST
Every time I blow out my radiator fins from the engine side, I resolve to make a nozzle with a 90 degree tip in order to get a better angle on the fins. 30 years now, and counting...
 
   / How hot is too hot? #6  

Rockbadchild

Platinum Member
Joined
Apr 29, 2021
Messages
841
Location
northern Ontario Canada
Tractor
2076E Massey Ferguson
Cleaning your radiator should do the trick, I usually air clean it, then I water spray it... I have seen old coolant clog up radiator (not on a tractor) and it was pretty old I don't think that your problem here.. I find the radiator get clogged up really fast when you mow with the wind in your back.
 
   / How hot is too hot? #7  

Thomas

Epic Contributor
Joined
Apr 6, 2000
Messages
27,047
Location
Lebanon,NH.
Tractor
Kubota B2650HSD w/Frontloader & CC LTX1046 & Craftman T2200 lawn mower.
As other said also check air filter.
 
   / How hot is too hot? #8  

xcgreene

Platinum Member
Joined
Jun 7, 2015
Messages
506
Location
Down East Maine
Tractor
2 Kioti DK45SEH's 1969 John D 2510
Both DKSE tractors I've operated never really go above the second dot unless something is wrong.

That DK40se should have removable screens in front of the radiator to keep most of the mess out of the radiator fins. The radiator itself may look good, but if the screens are clogged, the air flow is not sufficient. Also something important to check are the vent screens on the hood itself, they too can become clogged and cause air flow issues, allowing overheating. Also check your fan belt for condition and good tension. If these "quick fixes" don't work, and if your coolant is on the level, then the thermostat may be a bit sticky, and is cheap/easy to replace while doing a coolant change. Thermostat element should start opening at ~ 160deg f and be completely open at 185deg F, with 8mm of height. (thermostat element can be checked on a stovetop in water, slowly bringing it up to temp.)
 
   / How hot is too hot?
  • Thread Starter
#9  
OP
K

kspring61

Silver Member
Joined
Sep 1, 2014
Messages
126
Location
Now Western TN
Tractor
Kioti DK40SE HST Ford 8N
UPDATE: Thanks all for the replies.
I always clean the screens , both hood and the removable ones in front of the radiator, after every mowing session because of it getting clogged up with the grass tassles (seeds).
What I have been neglecting is blowing out the fins of the radiator from the engine side.
I did that and then used some ATV wash to do a good cleaning.
Went out and mowed yesterday and all was well, temps stayed right between the lines like xcgreene stated they should.

I will say when I blew it out and washed it, it was mostly just dust but enough of a layer of dust to make it heat up.
I'll be sure to keep doing this a few times during the mowing season.
 
   / How hot is too hot? #10  

MESSMAKER

Veteran Member
Joined
May 19, 2009
Messages
2,209
Location
Bluegrass,KY
Tractor
DK4710SE
It gets aggravating, but it is necessary.
 
 
Top