Kohler K91 Owner's Manual page 205

SUPPLEMENTAL INFORMATION
INTRODUCTION
The following information will assist you with troubleshooting, assembly,
and repair information, in light of changes made and experience gained since this
manual was first published in 1974. It also contains special service information for
1978-82 model year Sundstrand units.
SERVICE AND REPAIR PARTS
Hydrogear Conversions
Many hydrogear units (1 966 to mid-1 973)
have been converted to the serviceable piston-piston transmission.
Refer to the photos in this manual to identify the transmission in a
particular tractor.
Complete Transmissions Complete replacement transmission
assemblies are no longer available. Independent outside rebuilding
service many be available. Refer to the latest issue of Service
Bulletin 437 for information.
Repair Parts Use this manual to determine replacement part
numbers for 1965 to mid-1973 hydrogear units (Pages 54-56) and
mid-1973 to 1977 piston-piston units (Pages 60-62). Be sure to
check parts price list to determine if all parts needed are still
available before ordering parts.
Piston-piston part numbers for 1978-82 model year tractors are
contained in the particular tractor parts manual.
D-Series Adjustments
Transmission control linkage adjustments
described in this manual for 1975 models are appropriate for 1976-
77 models. 1978-82 linkage adjustments are covered in the 1978-79
B,C,D- Series Service Manual,
P/N
810063R1.
D-Series Driven Coupling Preload and Pump Alignment Refer to
Service Bulletins 217 and 305 for special service information.
CONSTRUCTION CHANGES, 1978 AND LATER
Sundstrand units on 1978 and later tractors differ from earlier units in
that the motor shaft extends through the cover plate, for the
mounting of a parking brake drum. Motor repair operations
described in this manual still apply, except that the motor cover plate
oil seal should be replaced during the repair process.
Supplement 1