Have a 44 walk behind hydro model 30291 which I believe is the same or very similar to yours. Engine has just been rebuilt with 0 hours on it.
It uses the 1041171 wheel motor. One wheel motor is perfect as are both pumps. The other one just had a seal and bearing go out.
Would be interested in offers on the whole machine, both hydro pumps and the good wheel motor or just the good wheel motor.
You can reach me a firstname.lastname@example.org