Oil Pump; Outline Of Oil Pump; Structure Of Oil Pump; Function Of Oil Pump - Kubota D1803-CR-E4 Workshop Manual

4. ENGINE

6.6 Oil pump

6.6.1 Outline of oil pump

The oil pump feeds suctioned oil to various parts.

6.6.2 Structure of oil pump

The oil pump is made up of a body, inner rotor, and
outer rotor etc.
(1) Body
(2) Inner rotor
(3) Outer rotor

6.6.3 Function of oil pump

(1) Inlet port
4-56
(4) Inlet port
(5) Outlet port
(2) Outlet port
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
1. This figure is an illustration as viewed from the
flywheel side.
2. The oil pump is driven by the crankshaft via an oil
pump drive gear.
3. Engine oil is suctioned into the pump through the
pump inlet port (1).
4. Engine oil inside the pump is compressed by
volumetric change based on rotation of the inner
rotor.
5. Compressed engine oil is sent from the pump outlet
port (2) to the sliding parts of various components.

6.6.4 Specification of oil pump

Item
Pump type
Inner rotor
Number of teeth
Outer rotor
Theoretical discharge volume
(Conditions are that oil temperature is
80 ℃ (176 ℉), and used oil is SAE 10W-30)

6.7 Relief valve

6.7.1 Outline of relief valve

The relief valve automatically opens at its set pressure
and lowers oil pressure.

6.7.2 Structure of relief valve

The relief valve prevents the damage of the lubricating
system due to high oil pressure.
The relief valve is made up of a spring and ball etc.
(1) Valve seat
(2) Ball
MECHANISM
6. Lubricating system
Specification
Trochoid
4
5
10 L/min or more
-1
(at 1000 min )
24.3 L/min or more
-1
(at 2000 min )
(3) Spring
KiSC issued 12, 2018 A