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JD 620 crankshaft seal

O

old fashioned farmer

Member
Howdy,

Just wondering if anyone else has had trouble with crank seals (on pulley side) on these tractors? I've had one in the shop three times now having to replace this seal. It leaks from the crankcase back into the transmission housing. I don't think I'm that horrible of a mechanic that I can't get a seal in right...three times. Any suggestions would be really appreciated. God bless.

--old fashioned farmer
 
What about where the oil pressuse is feed into the main bearing housing ? Isn't there just a rubber packing in there ? Maybe it's leaking or isn't there a dowel pin to hold the main from spinning and or another plug to seal off the passage ? maybe it fell out ?
 

I can tell you from experience that you should be checking the Clearance on that Mail Bearing...
Put a Dial-Indicator the crankshaft and lift on it..
Mine had .073" Clearance and didn't make any noise at all..the only problem seemed to be that the seal was letting engine oil into the transmission..
Had to replace that Main bearing AND Rod bearing..all because of the "Gasket" that is trapped between the engine crankcase and the bearing quill.
That "Gasket" had swollen and blocked the oil flow to that side of the crankcase.
If you do install a Bronze Main Bearing, have at least .005" bearing clearance..I used .004" and had a hard time breaking it in.
Let me know what you find, but I am SURE this is your problem..

Ron..
 
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