ZD21F Hydrostatic drive replacement

[Freckles555]

I have a ZD21F and the drive motors are shot. I have been told that there are no parts available and the only fix is a upgrade kit. I priced the kit but can't find any installation instructions. I understand you also install a remote reservoir.
Any one gone thru this?
Thanks

 

[lugbolt]

The WSM tells you how to do the HST R&R. The kit comes with instructions as well.

 

[fatjay]

Parts are available. I'm rebuilding my left side drive motor now. Chances are it's the swash plate. Crack it open and see, the part is $80 vs $1200 for the whole motor.

Consider the $200 resivour upgrade as well. Adds a tank so it doesn't suck air when you're mowing on a hill.