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Oil Slinger with Pressure Filtration
Vertical Models 120000, 210000, 280000,
310000, 330000
Some of these models are equipped with a
gerotor pump that draws oil from the sump,
pumps it through the oil filter, and back to the
sump (Figure 11). The gerotor pump is driven by
the cam gear. The slinger splashes oil
throughout the crankcase.
NOTE: This system does not supply oil under
pressure to any of the bearing surfaces.
Figure 11
Pressure Lubrication
Vertical Models 97700, 99700
A gerotor pump supplies oil to the camshaft
bearings and the magneto bearing. The gerotor
is located in the bottom of the sump, and is
driven by camgear. Oil enters the pump through
a slot and is pushed up the hollow camshaft to
the magneto upper camshaft bearing and
through a drilled passage to the crankshaft
magneto bearing (Figure 12). The oil slinger
lubricates the remaining bearings and journals.
Figure 12
Vertical Models 280000, 310000, 330000
On some of these models the gerotor pump
draws oil from the sump and pumps it through
the oil filter, then directly to the PTO bearing in
the sump (Figure 14).
The gerotor pump is driven by the cam gear. An
optional oil pressure gauge or switch can be
installed at the oil filter adapter.
Figure 13
Oil Pump Service
The oil pump can be removed from the outside of
the sump (A, Figure 14). The oil pump screen,
however, must be removed from the inside of the
sump.
Figure 14
Remove Gerotor Pump
1. Remove three screws then remove pump
cover (A, Figure 15) and o-ring (B).