Just as a followup post to this reply - the website linked has many transmissions and some do show how to disassemble to a point where grease can be added. The instructions are detailed. I tried to find a transmission part number for you but all the sites say no longer available so that model mower-tractor may be older than 4 years. The original owner's manual should have a parts page in it with numbers for each part. From there one can Google the transmission part number and see what comes up. That said, there are several big mower tractor bone yards in the USA that sell good used parts. Because the part come up NLA when the mower-tractor model number is put in, you might consider finding a good used trans from a bone yard and setting it aside in case the old one fails. I keep a plethora of used parts around for things I own only because so many devices these days no longer have a part, or because the superseded replacement part is too expensive. I hate to give up the space for a few boxes of things but I can't afford the cost of amortizing a $3500 item over 4 or 5 years, then replacing it again. Once you know the trans model you could also ask the trans manufacturer if they have a refurbished unit. Some companies sell factory refurbished units that are almost like new.