Komatsu PC88MR-10 Shop Manual page 92

10 Structure and function
EGR valve
Operation
(ENG95-A9K1-044-K-00-A)
A: EGR gas inlet (from EGR cooler)
B: EGR gas outlet (to air intake manifold)
DC motor shaft (2) of the DC motor converts rotary motion into linear motion. Accordingly, valve (7) is
opened or closed by turning the motor.
Open valve: The DC motor is turned and DC motor shaft (2) is pushed out to push rod (3) and open valve (7).
When valve (7) opens, the EGR gas flows into the air intake manifold.
Close valve: The DC motor is turned in reverse and DC motor shaft (2) is pulled in, then rod (3) is pushed
back by spring (9) and valve (7) closes.
10-14 PC88MR-10