I try to follow the manufacturer's service schedule, however when I don't it is usually because I have chosen to do items sooner than recommended. On the 50hr service I do what the book recommends plus the engine oil and filter and a complete greasing.
The filter part numbers are as follows:

Hydraulic Filter- 6695918
Hydrostatic Filter- 7375650
Engine Oil Filter- 7384298
Fuel Filter- 7374363
Air Filter- 6666333

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