Kubota WG1605-G-E3 - Oil Pump; Relief Valve; Oil Filter Cartridge

ENGINE
WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, WSM
1-M7
[2] OIL PUMP
This oil pump has an inner rotor (1) and an outer
rotor (2).
The inner rotor (1), which is driven by crankshaft,
rotates the outer rotor (2) in the same direction.
The inner rotor (1) has one less lobe than the outer
rotor (2), and they are eccentrically engaged with each
other.
This allows the other lobes to slide over the outer
lobes, making a seal to prevent back-up of oil. As the
lobes slide up and over the lobes on the outer rotor (2),
oil is drawn in. As the lobes fall into the outer rotor's
cavities, oil is squeezed out.
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[3] RELIEF VALVE
The relief valve prevents the damage to the
lubricating system due to the high pressure of the oil.
This relief valve is a ball direct acting type, and is
best suited for low pressures.
When the pressure of the oil, forced by the pump,
exceeds the specified value, the oil pushes back the ball
(2) and escapes to the oil pan.
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[4] OIL FILTER CARTRIDGE
After lubricating, the lubricating oil brings back
various particles of grit and dirt to the oil pan. Those
particles and the impurities in the lubricating oil can
cause wear or seizure of the engine parts. It may also
impair the physical and chemical properties of the oil
itself.
The lubricating oil which is force-fed by the pump, is
filtered by the filter cartridge with the filter element (2).
When the filter element accumulates on excessive
amount of dirt and the oil pressure in the inlet line builds
up by 98 kPa (1.0 kgf/cm
2
, 14 psi) more than the outlet
line, the bypass valve (1) opens to allow the oil to flow
from the inlet into the outlet line, bypassing the filter
element.
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(1) Inner Rotor
(2) Outer Rotor
(3) Inlet Port
(4) Outlet Port
(1) Spring
(2) Ball
(3) Valve Seat
(1) Bypass Valve (2) Filter Element
KiSC issued 05, 2014 A