Kohler Courage SV710-740 Service Manual page 119

1
Figure 9-20. Oil Pump Torque Sequence.
a. Start fastener 1 into hole, apply only minimal
torque to position the pump.
b. Torque fastener 2 to full value.
c. Torque fastener 1 to full value.
d. After torquing, rotate the gear and check for
freedom of movement. Make sure there is no
binding. If binding occurs, loosen the screws,
reposition the pump, retorque the hex flange
screws and recheck the movement.
Breather Design
The breather system is designed to control the amount
of oil in the head area and still maintain the necessary
vacuum in the crankcase. The system consists of an
inner chamber with a mesh filter inside the crankcase,
plus a spring steel reed, retainer, breather cover
and breather hose mounted on the outside of the
crankcase. See Figure 9-21. When the pistons move
downward, crankcase gasses pass through a passage
into the inner chamber, in turn air is pushed past the
reed into intake system. The upward travel of the
pistons closes the reed and creates a low vacuum in
the lower crankcase, in the process separating the oil
from the airflow in the mesh filter. Any oil separated
out through the filter drains back into the crankcase
through a small hole in the cover of the inner (filter)
chamber.
Inspection and Reconditioning
2
Reed Retainer
Breather Reed
Figure 9-21. Breather Assembly Details.
Governor Cross Shaft Oil Seal
If the governor cross shaft seal is damaged and/or
leaks, replace it using the following procedure.
Remove the oil seal from the crankcase and replace
it with a new one. Install the new seal to the depth
shown in Figure 9-22.
2.0 mm (0.0787 in.)
Figure 9-22. Governor Cross Shaft Oil Seal Details.
Cover
Screw
Breather Housing
Breather Stud
Washer
Nut
Governor Cross
Shaft Seal
Section 9
Filter
Breather
Hose
9
9.13