1981 John Deere 2040 with over heating problem

[Farmwithjunk]

Closed center system. Pump only works when there's a demand. Excessive heat usually means pump is pumping constantly.

Internal leak..... As mentioned probably is the steering. Also, remove the hydraulic oil filler cap (at rear of tractor) shine a flashlight in there while it's running. You MAY see an oil mist blowing around. If so, lift cylinder is leaking. Fairly common issue on 2X40 series.

 

[junkergeorge1]

open or closed system ? had a ten twenty doing the same thing. is your front pump a gear or rotary pump?

 

[Tx Jim]

junkergeorge1 :welcome: to TBN
You might get better response to your question if you had started your own thread. 1020 has closed center hyd. Is radiator clean? with engine running,3 pt raised look in hyd filler hole for dripping(spraying) oil which would indicate leaking 3 pt control valve seals. Next cap power steering supply line on RH and operate fora while. Does tractor have a FEL installed on it?

 

[junkergeorge1]

THIS 1020 HAD OPEN CENTER GEAR PUMP, PRIORITY VALVE UNDER PLATFORM WAS THE PROBLEM. IM NOT TRYING TO FIX MY 1020, I WAS REPLING TO A FELLA WITH A 2040 WITH SOMETHING IN RELIEF HEATING THE OIL

 

[Tx Jim]

George
Sorry but I disagree with you as all 1020's were closed center hyd's. Granted earlier 1020's had open center steering with a gear pump mounted to RH frt of engine,a gear trans pump that oiled trans then supplied oil to frt CC pump but 3 pt hitch and all other hyd functions were closed center. Photo of CC pump below. I sold 1020's when they were new plus served as a JD dealer service manager for over 10 yrs so I'm fairly well versed on a model 1020. JD did build some other 3 cyl utility tractors for N American sales that were open center(820,830 & early 2040)
Have a nice day,Jim

 

[kennyd]

IM NOT TRYING TO FIX MY 1020, I WAS REPLING TO A FELLA WITH A 2040 WITH SOMETHING IN RELIEF HEATING THE OIL

And that post is from 2008 George. This whole thread is that old, you dug it up from the grave

 

[junkergeorge1]

No, you cant burst my bubble, been humbled many a time, the 1020 I was working on was a very early one that was using up components from the 820 utility line built in Germany, as my parts man reminded me Deere did this in many model year switches. He does have a parts referral for it in his computer which we searched 10 minutes to find. yeh steering was open center from a piggy backed pump, front half operated brakes and 3 point I believe with a brake priority valve under the right platform. Glad they got away from this. problem turned out to be a weak relief spring in that particular valve heating the oil,.boy, 2008 seems like long ago. have a good day anyhow!

 

[Tx Jim]

SORRY George but the bursted bubble is 1020 utility's with closed center hyd's were according to Tractordata & other sources built 3 yrs before 820 utility's with open center hyd's. TRY AGAIN and you have a good day anyhow!!!!!!!!!!!!

 

[Jbarr1265]

The problem is the orings are bad in your steering valve. If I remember right the steering whel shaft goes through a spool that is about 2" or so in dia. This spool presses in the steering colom, with grooves in the steering colom casting. There are tiny grooves in the colom with o ring and backup rings to seal spool. These orings have failed, causing a high pressure leak, thus building heat.

Looks like I have the same problem, would it be possible to repair this without removing the entire column?
Thx

 

[leonz]

Please keep in mind that the steering valves spool clearances have become worn
after all this time and the machined surfaces will have worn and replacing the o-rings
just does not solve the problem.