Disassembly; Assembly; Disassembly And Assembly Of Hydrostatic Motor - Kohler K91 Owner's Manual

1.
Remove the
7/8"
hex head plug from each side
of the motor end cap.
FIG. 69.
2.
Remove the first valve by pulling it out. Remove
the second valve by pushing it out with the spring
and remove the spring.
NOTE:
To simplify removal of
the forward valve, located at the rear of the end cap
housing, move the tractor about an inch and oil pres-
sure will force the valve to pop out.
FIG. 70.
3 . The
acceleration valves may
be
disassembled
for inspection and cleaning.
Disassembly
a.
Carefully hold the valve body wrapped in a
cloth to protect it. Remove the metering plug,
ball and spring.
Assembly
Important:
a.
Make sure the small metering plug orifice in
side of the metering plug i s open. (Fig.
70).
b.
Seat the ball in the end of the metering plug
and install the spring and metering plug.
41
4.
Install the forward acceleration valve assembly
(the one with the wider relief flats) in the bore at the
rear of the end cap housing.
Insert the reverse acceleration valve assembly (the
one with the narrow relief flats) together with the
spring into the bore at the front of the end cap
housing.
Make sure the spring seats in the spring cavity of
each valve.' When properly seated each valve will
have approximately four or five threads exposed so
the
7/8"
hex ,plugs may be easily installed.
5.
Install both plugs using new
"0"
ring seals
and tighten :securely.
DISASSEMBLY AND ASSEMBLY
O F
HYDROSTATIC MOTOR
Disassembly
of Motor
1.
Remove the four
10-24
Allen head cap screws
that retain the cover plate, and remove the cover plate.
2.
Remove the large
"0"
ring seal from around
the ball bearing.
FIG. 71. Remove Snap Ring from Motor Shaft
3. Remove the snap ring from
the
end of the
motor shaft.