Kohler K91 Owner's Manual page 226

TRANSMISSION OVERHEATING.
COOLING FINS INSPECT ACCELERATION
VALVES
CHECK CHARGE
PRESSURE
LOW
I
I
INSPECT CHARGE
RELIEF VALVE
DEFECTIVE REPLACE
O K
INSPECT IMPLEMENT
RELIEF V A L V E
DEFECTIVE
O K
INSPECT MOTOR COVER
THRUST PLATE
INSTALL THRUST PLATE
A N D REPLACE CYLINDER
BLOCK ASSEMBLY
O' K
INSPECT HYDROSTATIC
O K
INSPECT SLIPPER
RETAINERS
DEFECTIVE
REPLACE
I
o k
INSPECT PISTON REPLACE CYLINDER
BLOCK ASSEMBLY
O K
INSPECT BLOCK ASSEMBLY CYLINDER DEFECTIVE
OK
INSPECT PARKING REPAIR OR
REPLACE
I
I
O K
GEARS BROKEN REPLACE
INSPECT TRANSAXLE