620 leaking oil flywheel

I have oil leak behind flywheel cover just small amount tractor been setting for about ten yrs I put it with a 6 ft cutter pulled it hard for about 6hrs did a great job I ck out everything change all oils every thing worked fine tractor does not have alots of sign of ware the lift holes drawbar hole is not worn it is a lp gas put battery on she turned over about 3 rounds fired up starts and run great cant belive it is this normal for one that has been setting for so long

Pull flywheel and replace packing in oil slinger.Ron

ron do you think if I use it a while the packing will swell enough to stop I was guessing all seals were dried out and would leak

I doubt it but it might. I have a JD 630 that I'm just finishing up installing a new slinger seal. Was a simple job except for removing the flywheel. Previous owner had buggered up the lock nut threads at the end of the crankshaft so there isn't any lock nut to set the end play. The splines were also very rusty and filled with paint and grit so it took a lot of effort to get it off. I built a puller to finally get it off the crankshaft. Cleaned up all the splines and grooves and it went back on very easily. The oil slinger has a slot that must be aligned with a square pin on the flywheel. Make sure to check that the flywheel and crankshaft V markings are lined up. I also used a finishing punch to mark the correct alignment. You will need to move the slinger groove to accept the pin on the flywheel. The slinger seal is a square (round) seal I bought from Mother Deere. My outer thrust bearing/gasket was torn so I had to replace it. When you put the housing that covers the slinger back on be sure to use shims to get it perfectly aligned/centered with the crankshaft. My ITT manual is very good describing the process and settings. Had to loosen up my starter to get the flywheel off. Bought new grade 8 bolts and nuts, fine thread to be safe. Torque figures were around 285 ft pound but I have a 600ft lbs manual torque wrench so that was not a problem. Some people use a multiplier or a 3/4 or 1 in socket and a three ft cheaper bar to approximate the torque. Be sure to check it again after you run the tractor for a few hours. That flywheel is heavy so use a engine hoist with a nylon axle loop to remove and replace the flywheel. Not easy but I did it without any help. Have fun.

worked the 620 again today when I parked it went back in a couple of hrs it leaked afew drops oil level was ok but found another leak one of the hdy coupling had a leak put cap on until I can repair it thank for the info about flywheel will keep eye on it and work on it whis winter made a copy of your instruction thanks again

(quoted from post at 03:08:15 08/15/13) worked the 620 again today when I parked it went back in a couple of hrs it leaked afew drops oil level was ok but found another leak one of the hdy coupling had a leak put cap on until I can repair it thank for the info about flywheel will keep eye on it and work on it whis winter made a copy of your instruction thanks again

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Few drops... ?
Why bother? It'll likely give those few drops for another ten years or more and still not be able to read an oil level drop on your dipstick. Myself... unless I was parking it in my living room I'd leave it go.