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

WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, WSM

[2] OIL PUMP

[3] RELIEF VALVE

[4] OIL FILTER CARTRIDGE

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.
(1) Inner Rotor
(2) Outer Rotor
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.
(1) Spring
(2) Ball
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
line, the bypass valve (1) opens to allow the oil to flow
from the inlet into the outlet line, bypassing the filter
element.
(1) Bypass Valve
1-M7
ENGINE
(3) Inlet Port
(4) Outlet Port
9Y1210661ENM0033US0
(3) Valve Seat
9Y1210661ENM0005US0
2
, 14 psi) more than the outlet
(2) Filter Element
9Y1210318ENM0019US0
KiSC issued 01, 2012 A