Kohler K91 Owner's Manual page 251

FIG. 72.
Hydrostatic Motor Exploded View
1.
Centering Pilot
2. "0"
Ring
3.
Motor End Cap
4.
Valve Plate
5.
Cylinder Block
&
Piston Assembly
6. Thrust Plate
7.
Motor Housing
8.
Bearing
9. " 0
Ring
10.
Retaining Ring
11.
Housing Plate
12.
Motor Shaft
13.
Motor Shaft Retaining
Clip
FIG. 73.
4.
Remove the four
3/8-16
cap screws that retain
the aluminum housing to the motor end cap (main
iron housing) and remove the aluminum housing. Note
the position of the housing. I t must be installed with
the webbed section up.
If
the cover is reversed, the
FIG. 74.
Motor Housing
unit will operate in
the
opposite direction.
5.
Re,move the housing-to-end-cap gasket.
6. Remove the thrust plate from the fixed swash
7.
Remove the ball bearing from the aluminum
plate in the housing.
housing.