If it's as "2x4" suggests and you need to get it out of the field & back to the shop, then here's a trick that will at least get it back in: (1) Put about 1 oz. of Brake Fluid into the gear oil in the final drive to swell the seals, (2) Thicken the gear oil in the final drive with "Motor Honey", (3) Flush out the clutch pack with Tetrachloroethylene - if that's not available you can use either Acetone or Methyl Ethyl Keytone. Do NOT leave the solvent in the clutch pack for more than a minute or two, as it will eat up the seals. Make certain that you flush all of the solvent vapors out of the clutch pack. - This trick DOES work, I've done it to get a machine back into the shop.