My 60 is reading low oil pressure of 3 to 4 lbs after it warms up. I changed the oil to rotilla 15-40 and changed the filter but nothing helps. When it first starts it reads high , but after it warms up I,t hovers around 3 to 4 at idle and even at full throttle it might hit 5 or 6, but no more. I have a generic oil gage in it and was wondering if this could be the cause of low readings. I seem to remember reading that you have to have a original john deere gage in order to read correctly on these two cylinder tractors. Is this correct?
- Thread starter chas036
- Start date
620 John
Member
I've seen those aftermarket ones read low. There's a guy by the name of Jerry Trcka that sells good quality gauges. I'm sure someone here will chime in with contact information.
I tested a couple of original gauges on a 620 and a late B with the air compressor and compared them to a fuel pressure gauge. All three read the same thing. So I'm fairly confident I can trust my two original gauges.
I tested a couple of original gauges on a 620 and a late B with the air compressor and compared them to a fuel pressure gauge. All three read the same thing. So I'm fairly confident I can trust my two original gauges.
jd man wis
Member
You need to change the oil to a straight weight oil like 30 or 40. You can run the 15 40 oil but it cleans the motor up inside and if the seal on the flywheel is old it will start to leak. These old tractor after time need the thicker oil to take up the play in the rods & mains & pump gears of the thousands they have lost over the years. You will be surprised on the oil pressure difference once you do this.
rustred
Well-known Member
buy yourself a glycerin filled guage and use that as a master guage. check the pressure with that when you have problems. i dont trust those tiawon or chinese made guages. very unlikely 15-40 oil is your problem. if the oil pressure is dropping that much after engine warm up its a sign your engine brgs. are worn out. so its one of two problems... worn out engine or junk guage. pressure is pressure and the type of guage dont matter, just as long as you use quality guages.
Mike Groom
Well-known Member
I have the opposite problem on my M John Deere,it reads high,when I rev it up it pegs the gauge,it's an after market one also,I guess I better put another gauge on it and double check to see what I have going on.
Kent Petersen
Well-known Member
You seam to be comparing 15w40 to 30&40W non detergent oil no body that knows any thing about motors will run non detergent this day and age. also if he has good PSI cold it wont, help when it gets hot .he better check out the brgs
Bob Harvey
Well-known Member
Just remember that the original gauge reads L-M-H. In that top oil pressure is only 15lbs., you are in the 'L' range. (any oil pressure is better than none) The 53-60 that I bought in 1971 still runs in the M++ range when cold and M to M- when hot. It has had new rod bearings , but not mains. I run 15-40 Rotella. HTH
I bought a gauge recommended for the M from a common supplier of restoration parts. When installed on my M it would peg out at idle with 10W-30 in it. I finally called Jerry Trcka at Evergreen Restorations and explained my concern. He told me that the M operated at a higher oil pressure than most other letter series tractors. He said he offered a gauge calibrated for the M. I bought it and the installed gauge reads on the M (medium) gauge point. Give Jerry a call, the peace of mind is worth paying for a correctly calibrated gauge.
jd man wis
Member
Well it sure worked on my a after I had to replace the oil seal on the flywheel side and if the gauge was good before the oil change it should still be good. I have had a 45 b that u could here the rods bearings being loose in there and would still hold good oil psi. The only thing he did was change the oil and now its low because of the light oil in there the oil pump gears will not push the oil as good as before.
jd man wis
Member
Sounds to me here that you have not ever worked on john deeres. Yes the right gauge does matter for this tractor. You cant take one off an unstyled a and put on it because it will read high all day. The 60 has better oil pump and will give a higher psi if you want. You say that unlikely the 15 40 isn't the problem ? how is the pump to make oil volume to the mains and rods when its that thin. Sure at first it does because the oil at first is thicker then thins out as things get hot and the pump cant supply the mains and rods. If he wants to run that oil in there I would be checking the clearance on the plate and oil pump gears because if the clearance is to much your not going to get the volume of oil when its 15 40.
fixerupper
Well-known Member
Straight weight won’t cure a worn engine. I run 10-30 in my 630 and the pressure runs at the ‘M’ at idle and half way between ‘M’ and ‘H’ wide open on a hot summer day. It has close to 20,000 hours and probably 4000 hours on the last overhaul but is still tight enough to hold good pressure. Some day if the pressure starts dropping I will have to bite the bullet and tighten things up inside but I’m not going to plug things up with heavier oil.
buickanddeere
Well-known Member
The proper gauge from EverGreen Restoration is a good start. Straight 40 weight oil and see if tweaking the pressure relief valve make any difference.
Has anyone over torqued the oil filter ?
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