2007 Buell Lightning: Engine 3-83
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OIL PUMP 3.15
GENERAL
See Figure 3-118. 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/swingarm 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.
Gravity-fed oil from the oil reservoir enters the pump through
the feed line connector. It is forced by the gerotor feed set
through a line to the oil cooler. Return oil from the flywheel
compartment/gearcase 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 pres-
sure, be sure that all possible related malfunctions have been
eliminated.
NOTE
If any oil line fittings are found to be loose, or not oriented in
the proper position, those fittings must be removed and thor-
oughly cleaned. After cleaning, apply LOCTITE 565 Sealant
to the fitting and re-install to the correct orientation. When
tightening oil lines, always support the oil line fitting with a
wrench to maintain proper orientation and prevent damage to
the oil line fitting.
1. Make sure all oil line connections are tight and that lines
are not pinched or damaged.
2. Check level and condition of oil in reservoir/swingarm.
Pressure will be affected if oil is diluted. In freezing
weather, proper circulation of oil can be affected if the oil
feed line 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 3-118. Oil Pump
1. Mounting gasket
2. Gear shaft
3. Oil pump body
4. 90
º 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
º Fitting
13. Sems screw (2)
14. TORX screw (2)
15. Rear connector fitting
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