Cub Cadet Yanmar 3TNV72 - Manual (Page 211)

LUBRICATION SYSTEM
9-10 TNV IDI Service Manual
Trochoid Oil Pump
Cleaning and Inspection
Wash the oil pump cover, the oil pressure regulator
valve, the oil pump cavity and the inner and outer
rotors. Inspect the parts for wear or damage.
Replace as necessary.
Note: If the oil pump cavity is damaged, the
gear case cover must be replaced.
Check Outer Rotor Outside Clearance
1. Reinstall the outer and inner rotors. The dots on
the rotor faces must face “up.” Make sure that
the pilot on the back of the inner rotor fits into
the bore of the oil pump cavity and the top
surface of the inner rotor is flush with the top
surface of the outer rotor.
2. Determine the outside clearance of the outer
rotor. Insert a feeler gauge between the outer
rotor (Figure 9-7, (1)) and the gear case oil
pump cavity (Figure 9-7, (2)).
Figure 9-7
Record the measurement. See Outer Rotor
Outside Clearance on page 9-5 for the service limit.
Outer Rotor to Inner Rotor Tip Clearance
Determine the outer rotor to inner rotor tip
clearance. Insert a feeler gauge between the top of
an inner rotor tooth (Figure 9-8, (1)) and the top of
an outer rotor tooth (Figure 9-8, (2)) and measure
the clearance.
Figure 9-8
Record the measurement. See Outer Rotor to Inner
Rotor Tip Clearance on page 9-5 for the service
limit.
Check Outer Rotor Side Clearance
Determine the side clearance of the outer rotor
across the pump cavity. While pressing down on
the outer rotor, measure the depression using a
depth micrometer (Figure 9-9).
Figure 9-9
Record the measurement. See Outer Rotor Side
Clearance on page 9-5 for the service limit.
A
CAUTION
If any oil pump component clearance
exceeds its limit, the oil pump must be
replaced as an assembly.
0000015en
(1)
(2)
0001151A
0001150B
(1)
(2)
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