Kohler K91 Owner's Manual page 245

and springs. (These valves are located in the passage
just below the charge and implement valve passage.)
11. Remove the push or free-wheeling valve
by
unscrewing
it
from the housing.
12. Remove the split back-up ring and the "0"
ring seal from the valve.
13. If
'the needle bearing in the charge pump
housing is' damaged, replace as follows:
a: Using a
13/16
O.D.
flat washer with two opposite
edges ground to a width of
11/16
as a tool, in-
sert i t from the gerotor side against the inside
of the needle bearing. Then, pressing against
the, washer
with
an arbor, remove the needle
bearing.
FIG.
52.
Pump End
Cap
Valves
9. Remove the
5/8"
hex plug from the top right
corner
of
the pump end cap. (Viewed from the motor
side of the pump end cap, see Fig.
52). If
the unit i s
equipped for hydraulic
lift
operation, there
will
be
shims located in the spring cavity of the plug. Do not
lose these shims as they determine the amount of
implement pressure. Remove the spring and cone
valve. Do not mix up this implement valve spring with
the charge valve spring removed from the top left
corner.
10.
Remove the two slotted pump check valve
plugs together with their respective check valve balls
FIG. 54. Needle Bearing Installation
FIG.
53.
Needle Bearing Removal
b:
To install the needle bearing, press it in place
from the front side. Note: Always install needle
bearings pressing on the heavy end, which
may be easily identified. It i s the end where
the identification numbers are found. Press
bearing to the correct depth
.loo"
should be
left out of the bore.