Kohler K91 Owner's Manual page 266

I THE TRANSAXLE
This
section i s written in general terms to cover all
automatic transmissions currently being used by
Wheel
Horse
REMOVAL OF TRANSAXLE COMPLETE WITH
HYDROSTATIC UNIT
Jack the tractor up and place jack stands under the
frame. Remove both rear wheel and tire assemblies.
Remove the tractor seat and fender assembly by re-
moving the hardware holding it to the transaxle. Re-
move the drive belt from the transmission. Remove
any access plates. Drain the transmission oil through
the transaxle drain plug
if
desired.
Place a jack under the transaxle and remove the
cap screws holding it to the frame. Lower the jack
and remove the entire transaxle assembly.
REMOVAL OF HYDROSTATIC UNIT
FROM THE TRANSAXLE
If
the transmission oil has not been drained, place
the entire assembly in an oil drain pan. Remove the
two
3/8"
top corner motor-to-case bolts and nuts, and
the two lower cap screws that thread into the case.
Carefully remove the hydrostatic unit from the
transaxle allowing the oil to drain as it i s removed.
Make certain that the control cam comes free from
the cam pin (ball stud). Now the magnetic strainer is
accessible.
FIG. 98.
Hydrostatic Unit, Gasket, Strainer and Transaxle
Remove the strainer and wash with solvent w.hen-
ever servicing the transaxle.
Check
the magnet at the
end of the strainer for metal particles.
If
metal particles are found, carefully inspect the
internal parts of the hydrostatic unit for damage.
TRANSAXLE DISASSEMBLY
The
transmission case is
held
together with six bolts.
Disassembly may
be
made from either side, leaving
the gears
intact in the opposite side. NOTE:
It i s not
necessary to remove the hydrostatic unit
if
only the
transaxle i s being serviced.
FIG. 99. Split
Transaxle and Gasket
1. Remove both wheel hubs by loosening the lock
nuts and set screws.
Slide
the hubs from the axle.
A
special wheel puller may
be
required.
2.
Remove the woodruff keys and file any rough
edges from the key slots and the ends of the axle.
3 .
Remove the six bolts holding the transmission
case halves together.
4.
Lightly tap the half to be removed with a
plastic or rawhide mallet to break the seal.
Slide
the
case-half off, the axle carefully to avoid damaging
the oil seals.
5.
Remove the old gasket and carefully clean the
sealing surfaces.
FIG.
100.
Disassembled Transaxle
57