2002 Buell P3: Engine 3-49
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OIL PUMP 3.13
GENERAL
See Figure 3-90. The oil pump consists of two gerotor gear
sets, feed and return, housed in one pump body. The feed set
distributes oil to the engine, the scavenge set returns oil to
the tank/frame reservoir.
A gerotor-type gear set has two parts — an inner and an
outer gerotor. The inner gerotor has one less tooth than the
outer gerotor. Both gerotors have fixed centers which are off-
set to each other.
In a gerotor gear set, oil is transferred from inlet to outlet as it
is trapped between the rotating inner and outer gerotors.
See Figure 3-90. Gravity-fed oil from the oil reservoir enters
the pump through the feed hose connector. It is forced by the
gerotor feed set through a hose to the oil filter. Return oil from
the flywheel compartment is drawn back into the pump and is
forced by the gerotor scavenge set back to the oil reservoir.
The oil pump seldom needs servicing. Before you disassem-
ble an oil pump suspected of not producing adequate oil
pressure, be sure that all possible related malfunctions have
been eliminated:
1. Make sure all oil hose clamps are tight and that hoses
are not pinched or damaged.
2. Check level and condition of oil in tank. Pressure will be
affected if oil is diluted. In freezing weather, proper circu-
lation of oil can be affected if the oil feed hose becomes
clogged with ice or sludge.
3. Check for a grounded oil pressure switch wire or faulty
switch if oil indicator light fails to go out with engine run-
ning.
Figure 3-90. Oil Pump
1. Mounting Gasket
2. Gear shaft
3. Oil Line Assembly
4. 90 Fitting
5. O-ring
6. Thrust Washer
7. Retaining Ring
8. Gerotor Return Set
9. Separator Plate
10. Gerotor Feed Set
11. Cover
12. 45 Fitting
13. Sems Screw (2)
14. TORX Screw (2)
15. Rear Connector Fitting
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