Implement Pressure Test; Repair Procedures; Separation Of Pump And Motor - Kohler K91 Owner's Manual

and again after the transmission has reached operat-
ing temperature. An appreciable drop in charge pres-
sure as the temperature rises indicates internal leak-
age caused by worn parts resulting in loss of power.
FIG. 14.
Charge Pressure Test Standard System
IMPLEMENT PRESSURE TEST
Use the same gauge hook up as Charge Pressure
Test.
If
the tractor
is
equipped with a hydraulic lift, im-
plement pressure should
be checked.
Pressure should
FIG. 15.
Hydrostatic Transmission
As
installed in a Standard System
be
550
to
700 PSI
when the piston has reached the
end of its stroke.
REPAIR PROCEDURES
On
"B"
and
"C"
Series tractors and other standard
system tractors, the hydrostatic pump and motor are
bolted together as one unit. (Fig.
15).
On the
1973
18 HP Automatic and all
"D"
Series tractors the pump
and motor are separated to accommodate the design
incorporating a manifold between the pump and
motor.
FIG. 16.
Pump and Motor Separated
FIG. 17.
Separation o f
Pump
and Motor
The
pump and motor may
be
separated so that new
seal rings may
be
installed between the pump and
the
motor housings, and to facilitate overhaul. Four bolts