Kohler K91 Owner's Manual page 268

CAUTION
For proper operation it is vitally important to keep
the interior of the transmission as free of dirt and
foreign matter as possible.
Exercise caution when servicing the unit to prevent
damage to
oil
seals, bearings, and other internal parts.
Transmission oil capacity is a total of five quarts
on most tractors, six quarts on "D" series tractors.
Normally, one quart i s retained in the hydrostatic
unit, leaving four quarts to be added. Run the tractor
for a minute, then check oil level. Add oil if
necessary.
Use only
10W30
automotive engine quality oil..
NOTES:
TRANSAXLE GASKET INSTALLATION
1. Block the tractor under the frame.
2.
Loosen the lock nut and set screw on the
right
hand side and remove the entire tire, wheel and hub
assembly. Remove the woodruff key and file any rough
edges from the key slot and the end of the axle.
3.
Remove the tractor seat and fender assembly
by removing the hardware holding it to the transaxle.
Remove the footrest bracket and the belt guard as-
sembly, and remove the drive belt from the trans-
mission. Remove any access plates.
4. Disengage the spring from the parking brake.
Remove the rear hitch.
5.
Remove the two cap screws holding the right
half of the transmission case to the frame.
6.
Remove the six nuts from the bolts holding the
transmission halves together.
Do
not remove the bolts
securing the hydrostatic unit.
FIG.
104. Transmission
Half
and New Gasket
7. Slide
the transmission half off the axle. Care-
fully clean all machined surfaces of dirt. Take care
to
keep any foreign matter from entering the system.
Replace the gasket.
8.
Carefully reinstall the transmission half to pre-
vent damage to the axle seal. Tighten all nuts securely
in rotation.
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