Id appreciate so maintenance instructions for the subject drive units, i.e., fluid/strainer or filter replacement recommendations, and sources for those parts. The units fit a Model RZ5424.
Looks like the hydro-gear EZT units. So the filters are internal and would require removal and disassembly to replace the strainers, so not feasible. Depending on if you can get to the fill plugs are not you maybe able to suck out what fluid you can get, measure it and then replace that amount. Otherwise will require removing the drives from the mower, removing the fill plug and then turning them upside down to drain and then refill with 20W50 motor oil of your choice.
