Hydraulically Actuated Egr Valve; Hydraulic Actuator With Solenoid - Detroit Diesel Series 60 EGR Technician Manual

DDEC V COMPONENTS

Hydraulically Actuated EGR Valve

The EGR valve is hydraulically actuated using engine oil and eliminates the need for an EGR
VPOD. The butterfly valve design is still used to control the exhaust gas flow through the
EGR cooler. The ECU continuously monitors all engine operation modes and performs self
diagnostic checks for engine RPM, engine load, altitude, incoming air temperature, and uses this
information to determine the EGR valve position. The ECU changes the EGR valve position via a
PWM to the solenoid in the actuator. See Figure 8-22.
NOTE:
When installing a new hydraulic actuator or EGR valve, manually closing the valve
during installation will make the first start up easier. Once the engine has started and oil
pressure through the actuator has equalized, operation will be normal.
The EGR valve operating values are 0-12 V or 0-24 V depending on vehicle electrical system.
Figure 8-22

Hydraulic Actuator with Solenoid

8-24
All information subject to change without notice. (Rev. June 2005)
7SE60 0506 Copyright © 2005 DETROIT DIESEL CORPORATION