JD 620 LP - smoking

[David A. Kocian]

I have a JD 620 LP that has been running perfectly. Yesterday, I added transmission fluid (80-90 weight gear oil). I know I did not overfill it since the oil never did run out of the fill hole at the bottom. I was also having some knocking in the hydraulics and I added fluid to the hydraulics. I checked the crankcase and noticed it was at the low end, so I added a quart and when I checked again, it was at the full mark. Cranked the tractor up and the hydraulics knocked once or twice and then the noise went away completely. That was great. But suddenly, the tractor started billowing out clouds of white smoke. No adverse sounds from the tractor. The engine runs smoothly. Could the transmission fluid someway get into the crankcase? If I overfilled the crankcase, could that cause the smoking? I noticed in the manual that crankcase oil can transfer to the transmission, causing excess oil consumption. Could it go in reverse? Sure would like some help on this one. Thanks.

 

[Mike M]

How is the antifreeze level ?

 

[Anonymous-0]

Hi David
Sounds like you may have a regulator problem on the LP system or possible head gasket since you said it was white smoke.
Tom

 

[David A. Kocian]

No problems with the antifreeze or cooling system. Weird thing is it ran perfect, and then I added oil, and it starts smoking. Oil level was not "empty" but showed up just above the "low" mark. Could putting too much oil in the crankcase let it get into the cylinders? It acts like a bad PCV valve would on a car, but as far as I know, nothing like that on a JD 620.
David

 

[Mike M]

The hyd. could get into the engine through the hyd. pump driven on the governor.
I would think it should take alot overfilled before it caused much troubles. I have seen JD B's run so full it ran out the belt pulley. Carb. stuck and filled up crankcase on it. Can't happen on yours,but the LP converter can leak water into the fuel area.