I have a 1995 Murray 42″ riding mower with a hydrostatic transmission. Recently, it seems like the mower is laboring more to move itself around (more whine from the transmission and the engine loads up). It looks like there might be a little bit of a leak from the right axle, so I was thinking the fluid might be a little low. How do I check the fluid level (no dipstick), and what type of fluid should I add? The only thing I see is an oil expansion chamber. The manual says not to change or add oil but to take it to a dealer. There has to be some way to add oil? Anyone ever serviced one of these?