Last year I basically ruined the gear box on my blower. This is the one that is mounted right in the intake and where the augers are driven from. The pto shaft comes out of the fan to this gear box. I had all the correct shear pins in place but when I took this box apart I found no oil and little grease. Not sure why this box broke apart but the one gear is brass and it had no teeth left on it. Even the box itself had a crack. To repair it with original JD parts was going to be near $2000. Still looking for someone parting out this kind of blower. My question is that the box has a plug half way up and a grease fitting at the top. What lubrication should be used ? Should the gear box be pumped full with grease or fill it with gear oil from the plug. There is no drain plug. Hate to damage another box if it was lubrication.