Sometimes when I start tractor and engage forward or reverse automatic shuttle shift lever nothing happens. Sometimes I will jerk the loader bucket to move the tractor and then it engages, and will work fine there after. Only when tractor sits for a while is there an issue. Manual says could be low oil and the same oil is used in rear axle. However, nowhere can I find where to check or add oil, and of course manual doesn"t say anything there. Help. I wish these manuals were a bit better. If you have ideas can you tell me where to look for location to change filter or check oil that would be appreciated. I"ve looked at rear axle and don"t see anthing. I love this tractor otherwise. Thanks, Kurt