Specification Of Injector; Overflow Pipe; Outline Of Overflow Pipe; Structure Of Overflow Pipe - Kubota D1803-CR-E4 Workshop Manual

MECHANISM
3. Fuel system

3.13.4 Specification of injector

Operating voltage
Operating pressure range
D1803-CR-E4, TE4,
V2403-CR-E4, TE4,
Number of injection
TE4BG
holes
D1803-CR-TIE4,
V2403-CR-TIE4
QR correction points

3.14 Overflow pipe

3.14.1 Outline of overflow pipe

The overflow pipe is a path for returning excess fuel
after injection to the tank.

3.14.2 Structure of overflow pipe

The overflow pipe is made up of two pipes, the return
from the injectors and the return from the supply pump
and rail.
(1) Overflow hose
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
110 V
30.0 to 160 MPa
2
306 to 1630 kgf/cm
4360 to 23200 psi
7
8
4
(2) Overflow pipe

3.14.3 Function of overflow pipe

The overflow pipe is a path for returning excess fuel
after injection to the tank.

3.15 Check valve

3.15.1 Outline of check valve

The check valve prevents reverse flow of fuel inside the
fuel piping.

3.15.2 Structure of check valve

There are two types of check valves, with or without a
regulator.
(A) No regulator

3.15.3 Function of check valve

The check valve prevents reverse flow of fuel inside the
fuel piping.
The check valve is being used as a no-return valve.
A check valve without a regulator is used in the return
path from the fuel filter.
This path is used as a return path for excess fuel and
for air bleeding.
A check valve with a regulator is used in the return path
from the overflow pipe.
This is to retain back pressure inside the return path
from the overflow pipe.

3.15.4 Specification of check valve

Valve opening pres-
Regulator included
sure

3.16 Fuel cooler

3.16.1 Outline of fuel cooler

The fuel cooler cools fuel returning from the engine.
Cooling fuel returning to the fuel tank prevents
temperature increase of the fuel in the fuel tank.
4. ENGINE
(B) Regulator included
11 kPa
2
0.11 kgf/cm
1.6 psi
4-29
KiSC issued 12, 2018 A