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JD70 coolant temp?

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ToddF

01-29-2002 10:13:49




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My JD70 gas doesn't ever seem to warm up to a reasonable operating temperature. I only use it for plowing snow in the winter and pulling in the summer, but the temp gauge never breaks 140 F. I wonder if the thermostat is stuck open or has been previously removed. The parts book shows a tube with O-rings at either end. Am I correct in assuming I will need to replace those O-rings if I take it apart to replace the thermostat? And can I replace it without removing the tube? Do I have to remove the flange at the upper end from the radiator? Any advice would be appreciated. Thank you....ToddF

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AL

01-30-2002 17:05:24




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 Re: JD70 coolant temp? in reply to ToddF, 01-29-2002 10:13:49  
Several years ago I installed a new thermostat in my JD70 because it didn't heat up at idle. With the new thermostat, it runs between 140-150 at idle with any outside temperature. But you have to pull it to get the temperature over 170.



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Donwisc

01-29-2002 17:41:01




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 Re: JD70 coolant temp? in reply to ToddF, 01-29-2002 10:13:49  
The old letter series JDs all came with shutters to help regulate the operating temp which was important to run at higher temp when burning distillate.

If you are concerned about running too cool just put some plastic in front of the grill and adjust the area blocked to the temp. I had to do this on my 830 with 4btm just to make the gage move.



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lynn

01-29-2002 15:59:37




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 Re: JD70 coolant temp? in reply to ToddF, 01-29-2002 10:13:49  
todd i was wondering if you take the fan belt off the water pump the water would circulate like the older tractors and maintain water temperature the thermal way..if it doesn't have a thermostat and the water pump didn't block flow it still might circulate the water but keep it warmer in cold weather without the water pump working lynn



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Pete

01-29-2002 15:25:44




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 Re: JD70 coolant temp? in reply to ToddF, 01-29-2002 10:13:49  
Todd, When ya go to the dealer to get the O rings, get about a half dozen so ya don't have to go back if you cut one. Tyler was right...be sure to clean up the pipe ends and the O ring grooves good! Then use a little liquid hand soap for lube during installation, and hope ya never have to mess with the lower oioe! Pete



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Dave 2N

01-29-2002 15:09:31




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 Re: JD70 coolant temp? in reply to ToddF, 01-29-2002 10:13:49  
We went through our 54 70 when we re-did it a couple of years ago. We sent out the radiator to have it reconditioned (MAJOR pain with these JD radiators), new hoses and new thermostat. It takes a warm day and something that will really make her grunt for the thermostat to go above 170 and then it will still settle back to the 140's until it's stressed again.



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Deere Puller

01-29-2002 12:44:01




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 Re: JD70 coolant temp? in reply to ToddF, 01-29-2002 10:13:49  
Our 70, with a fresh but not over-built motor & new radiator only gets above 140 when doing light chores if the ambient air temp is above 90 degrees. It will push 180 when plowing for an hour or two, but that's about it - The cooling capacity is so excessive that it's really hard to heat them up - Sort of like the "G" - I wouldn't worry about the thermostat....



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poorerbut

01-29-2002 12:12:28




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 Re: JD70 coolant temp? in reply to ToddF, 01-29-2002 10:13:49  
ToddF: Everything on my '53 is new, and you REALLY
have to pull her ears down to get the gauge up to
180 degrees. I changed the thermostat while I had
everything apart, (mines on the low end) and it
was still a pain. TylerB should be right on for
you upper end thermostat, and I wouldn't be surprised if you were missing the thermostat from
the tractor. Seems like most '70's I run across
have had them removed . Good luck. pb

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Tyler B

01-29-2002 10:45:21




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 Re: JD70 coolant temp? in reply to ToddF, 01-29-2002 10:13:49  
I had a 59' model 730 gas that ran very cool. I pulled a seven shank chisel plow and it never went past 170. But under normal running conditions it never went past 140.I ended up taking apart the thermostat housing and suprisingly found out that there wasnt any thermostat. And yes, you do have to take the pipe apart and be sure to replace the O-rings. Be sure to clean the rust off around the pipe before installing the O-rings so they dont get scuffed up. It takes a substantial force to press the pipe together with the new O-rings. I don't think that you have to remove the flange, but the thermostat housing has 3 bolts on it. If memmory serves me right, there is one stud and two bolts. One of them is a real pain to get to. After The thermostat is in it should run up to at least 140-170 range.

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Ron

01-29-2002 18:16:48




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 Re: Re: JD70 coolant temp? in reply to Tyler B, 01-29-2002 10:45:21  
Better make sure you have a thermostat in the 70..... A cold engine WEARS Cylinders.... Ever wonder why an "inline 4, or 6cylinder" engine always wears the front cylinder toward the water inlet.???-----Cold water enters, there... That side of #1 runs COLD... At least a thermostat will hold hot coolant in the cylinder block...



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R L Armstrong

01-29-2002 18:59:12




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 Re: Re: Re: JD70 coolant temp? in reply to Ron, 01-29-2002 18:16:48  
I'd agree with Ron, I would rather see the temp. gauge up around 170 or 180 than cold. I would install a new thermostat & replace all ness, gaskets & seals. I know that the 620 & 630's run warmer, & i think warmer is better for the engine & the engine crank case. I have installed automotive thermos's in 60,620's that are 180 degrees & never have had a problem with them running too hot. We need all the heat we can get with the winterfronts on this time of year. RLA

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R L Armstrong

01-29-2002 18:58:39




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 Re: Re: Re: JD70 coolant temp? in reply to Ron, 01-29-2002 18:16:48  
I'd agree with Ron, I would rather see the temp. gauge up around 170 or 180 than cold. I would install a new thermostat & replace all ness, gaskets & seals. I know that the 620 & 630's run warmer, & i think warmer is better for the engine & the engine crank case. I have installed automotive thermos's in 60,620's that are 180 degrees & never have had a problem with them running too hot. We need all the heat we can get with the winterfronts on this time of year. RLA

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