Kubota WSM L3560, Workshop Manual, Page: 137 / 801

ENGINE
L3560, L4060, L4760, L5060, L5460, L6060, WSM
1-M22
[2] EGR COOLER
The EGR (Exhaust Gas Recirculation) cooler (1) is
used to lower combustion temperature and efficiently
cool EGR gas, with the aim of reducing the NOx that is
in the exhaust gas of diesel engine.
The EGR cooler (1) is set between the cylinder head
and the EGR valve and returns the cooled exhaust
gases to the engine suction side.
The EGR cooler (1) has resistant to clogging up,
compact and efficient tubes (2) internally.
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[3] EGR VALVE
Water Cooled EGR Valve
This is a device that regulates EGR gas flow. The
degree the valve is open is detected using a lift sensor
and a motor is used to set this to the degree of open
calculated using signals including the engine speed.
Also, passing engine coolant through the housing
enables controlling temperature rise of the EGR valve.
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EGR Valve Lift Sensor
How far the EGR valve is open is detected by a
contact type of position sensor that detects the
movement of the motor's shaft. The motor's shaft opens
and closes the valve by changing the rotation of the
motor into linear motion via a screw deceleration
mechanism.
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[4] REED VALVE
The reed valves are set at the point where exhaust
gases that have passed through the EGR valve mix with
intake air and they prevent air on the air cleaner side
from flowing to the EGR cooler side.
These thin plate springs (reed valves) mounted at
the bottom of the EGR valve motor open and close the
EGR gas passage (during intake: reed valve is closed;
during exhaust: open) and prevent the intake air from
backflowing to the exhaust side.
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(1) EGR Cooler
(2) Tube
A: Coolant Inlet Port
B: Coolant Outlet Port
(1) CAN H
(2) CAN L
(3) GND (
−
)
(4) Power (+)
(5) Exhaust Gas Flow
(6) CAN Communication Data
(1) Valve
(2) Case
(3) Stopper
KiSC issued 03, 2016 A