JD 950 Temp Light: John Deere Review  -- John Deere Tractors Discussion Forum and Review JD 950 Temp Light: John Deere Review -- John Deere Tractors Discussion Forum

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 04-23-2001, 17:18 Post: 27121
Todd Wilson



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 JD 950 Temp Light

I'm new to tractors but not new to engines and so forth. My tractor is a 2wd 950 diesel. It has a rebuilt engine with about 23 hours on it now. I am doing some bush hog work with it. Its warming up now here in kansas and I have been mowing. Its been up in the 70's and starting to get warm.Question.......What temperature does the TEMP light come on at? Is this a dangerous temperature when this light comes on or is it a warning to do something different before its dangerous? I have had the temp light come on a few times and stop and clear the front screen from the radiator. I stop every once in a while to clean the screen but sometimes the temp light comes on and then I stop. At an idle I clean the screen and within 30 seconds the light goes out and away I go. Is this the normal thing or is the temp light coming on when the diesel is at a dangerous temp level? If this is a dangerous level how can I correct this so it doesnt happen every 30 minutes of mowing. There are times I get into some brush that has a lot of small particles flying about and the screen plugs pretty fast. I just dont want to damage this diesel engine from heat and especially being rebuilt. So far its running like a top. Good power and everything. It doesnt seem to skip a beat when the temp light comes on. I constantly watch the lights as I mow so I dont run it for an extended time with the temp light on.Thanks!Todd






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 04-23-2001, 18:34 Post: 27123
Mark E. Lamprey



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 JD 950 Temp Light

Todd, I am looking at the manual for my 950, on page 7 under Engine Break-in, for the first 100 hours, it says, 1) Avoid unncessary engine idling. If tractor will be idle for more than five minutes, stop the engine.
2) Watch coolant temperature indicator closely. If lamp glows, shift to a lower gear or reduce load. Unless temperature quickly drops, stop the engine and determine the cause.
I would have to believe that item #2 would be a good policy throughout the life of the tractor and not just the first 100 hours. Hope this helps. Mark






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 04-23-2001, 18:43 Post: 27124
Mark E. Lamprey



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 JD 950 Temp Light

Todd, I forgot to finish the last post before I sent it. What little knowledge I have of diesel engines, I understand that they do run and like to be hot. Just how hot, I do not know. I don't see in my manual anywhere where it says at what temperature the 950's temp light will come on. Under the Trouble Shooting section under "Engine Overheats" it does list some causes and remedy's. If you think you would like that list, let me know and I will email it to you. Mark






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 04-23-2001, 20:01 Post: 27130
Todd Wilson



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 JD 950 Temp Light

I read the same thing in my book. I was just curious as to what temp it does come on. I think the screen being clogged up is what is causing the light to come on. I stop and idle and clean screen and it goes off in 30 seconds or less and then I can continue on with my mowing. I am just concerned that theres damage to be had when the light comes on and was curious as to what the temp is. I mowed for about 5 hours today and cleaned the screen 4 times and the 4th time the light came on. Weather was 70 today. Things did warm up but not like it will be in July when its 100 outside. I am hoping I bought the right tractor for the job. In July 100 heat I would hate to mow and stop every 5-10 minutes because of the temp light. Is there any tricks out there to help prevent the screen from clogging? Am I just experiencing a fresh engine being tight and running a little on the warm side until broke in? Or is all this just normal and me cleaning the screen and idle til light goes off and continue on the normal and right thing to do?!?!


Todd






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 04-23-2001, 21:32 Post: 27132
Kenny



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 JD 950 Temp Light

Todd, The light should be coming on at approximately 230 degrees. I assume that you are not seeing any boil over out the radiator cap since you don't mention it. although it is normal to need to clean the screen occasionaly, it sounds like yours is a little extreme. Are you sure that the radiator fins themselves are clean? Looks can be deceiving. When the throttle is wide open, you should be able to hold your hand in front of the radiator and feel a large volume of air being drawn through the radiator. Just be careful that you don't get anywhere near the fan! Also , is thye fan belt tight? Is the fan blade and shroud installed properly and undamaged? The radiator may be internally clogged, keeping antifreeze from flowing properly. I think you must have some cooling system problem, because this engine should not be overheating in 70 degree weather. Another thought, the temperature sensor could be bad, or the timing could be out of spec on the engine. I hope that some of this helps. Kenny






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 04-23-2001, 22:51 Post: 27145
Roger L.



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 JD 950 Temp Light

I don't think you have hurt it, and new ones do run hotter. On my 336D (has the same engine) I took a garden hose, ivory soap, and a very soft brush and squirted through the radiator fins from the engine side. Washed all kinds of crud out of there. Then it got a cooling system flush with liquid Prestone radiator flush in the bottle (not the heavy duty powder). I know that stuff is caustic and didn't want to hurt the radiator, so I only used it at half the recommended strength and just left it in for long enough to run the tractor and get it warm - about 10 minutes - instead of for a long time like it said on the Prestone container. Then stuck the garden hose in the radiator filler neck and flushed all that stuff out. Next came antifreeze and water. I knew not to use more than 50% antifreeze, as that will protect the system and antifreeze is not nearly so good at transfering heat as water. Finally for peace of mind I took out the temperature light sender and screwed in a "T" connector into the block. The temperature light sender went into one side of the T and regular temperature
gauge sender was installed in the other side of the T. The gauge itself is wired down by the shift lever where I can see it. Haven't had a problem since.






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 04-24-2001, 06:09 Post: 27149
Mark E. Lamprey



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 JD 950 Temp Light

Roger, I like your idea of the T and a seperate line for a real temperature guage. I never did really trust a light. I will have to see about installing the same on my 950. Thanks for the idea. Mark






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 04-24-2001, 12:00 Post: 27165
Todd Wilson



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 JD 950 Temp Light

There is no boil over at all. I did blow some air thru the radiator the other day as I inspected things and did the regular servicing. The fan,belt and shroud all seem to be fine. It is pulling a lot of air thru the radiator. I will stop the tractor and go to idle and open hood and clean off the screen up front. I am getting 3-4 good fist fulls of grass and stuff off it. I can feel it pull the air thru real good. I did this 3 times yesterday and then was mowing along later and the light came on so I stopped and cleaned the screen and the light went off. The light only came on 1 time yesterday and I put 5 hours on the meter running the brush hog. I was just concerned about the temp it does reach when the light does come on. I may look into rigging up another screen to help prevent clogging of the one that goes with the tractor.
I have ran this tractor doing other things and have only had the light come on 2 times and that was both when mowing and the screen was clogged up when it happened. I'll run some water thru the radiator before I run it again to make sure its cleaned out. I just dont want to hurt this rebuilt diesel while breaking it in. I have worked on cars in the past and know the first hours/miles of a new engine are critical as to how it will be the rest of its life. I hope this diesel will out last me!
Thanks for all the ideas and info!

Todd






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 04-24-2001, 14:29 Post: 27168
Murf

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 JD 950 Temp Light

In our line of work (golf course construction) keeping the rads clean & clear is a constant headache. The (relatively) simple solution we came up with was to place a light frame with a slot to accept a slide-in screen panel (window screen) about 3 inches in front of the rad. Being even this short distance back from, and slightly larger than the rad opening the vacuum on it is greatly reduced. Then the screen panel is merely slid out and shaken / brushed clean with the tractor at an idle, keeping hands well clear of the hot rad, and keeping the rad itself much cleaner. This screen seems to allow much better air flow when 'full' than the rad, probably because of the reduced suction being set back a little. Best of luck.






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 04-24-2001, 14:59 Post: 27169
Mark E. Lamprey



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 JD 950 Temp Light

Murph, The JD 950 has an debris screen very much like you described built right into it although it sits close, right in front of the radiater (you may already know this). When I bought my tractor a couple of months ago I had to slide it out and clean it. It seems to do a nice job of collecting a lot of stuff that would wind up in the radiator fins otherwise. Mark






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

Thread 27121 Filter by Poster:
Brian A 1 | cwsull11 2 | Kenny 1 | mark 1 | Mark E. Lamprey 4 | Murf 1 | Rick Cosman 2 | Roger L. 2 | Todd Wilson 4 |




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