30SC ? Your heading said 30RC... Two completely different trucks. I'm not real familiar with SC's. Either way removing the motor from most drive unit is pretty straight forward. Pulling the drive unit is sometimes a chore if you are not familiar with the "tricks of the trade". If you had little to no gear lube (typically 80/90) chances are it is the drive unit that failed. As far as hydraulic oil Crown normally recommends AW/ISO 32 or equivalent. Thinner oil if ran in freezer or cold and you can go heavier if in hot environment.

Also... You typically wont find a lot of manuals on line for most forklifts. You have to obtain them from a dealership or be a "partner" or have a corporate deal with manufacturer to get access to the online resources.

If you are having issue getting your most local Crown dealership service to respond, maybe post on this site under Tech arena with your location that you are looking for an independent in your area. I'm sure there are independents in your area that would respond within a day if not same day. A lot of times the independent guys are top notch techs and will quote/bill out way lower than dealership service departments.