Table of Contents
Advertisement
The optional radiator shutters aid in maintaining proper
engine coolant temperature, primarily in cold climate
operations.
The shutter system contains the following components:
Shutter assembly with hydraulic control actuator
•
cylinder
Hydraulic oil supply pressure reducing valves and
•
cylinder control solenoid
Solenoid control relays
•
Shutter enable/disable switch
•
1. Radiator Shroud
2. Oil Supply
3. Pressure Reducing Valve
4. Pressure Reducing Valve
5. Shutter Solenoid Valve
6. To Cylinder Head End
7. To Cylinder Rod End
8. Electrical Harness (To RH
Frame Junction Box)
9. To Shutter Disable Switch
box
10. Oil Return to Tank
Hose
11. Shutter Actuator
Cylinder
FIGURE 19-1. SHUTTER ACTUATOR CYLINDER OIL SUPPLY VALVES
M19003
RADIATOR SHUTTERS
OPERATION
Hydraulic Circuit
Hydraulic oil pressure to operate the shutter assembly
actuator cylinder is supplied from the truck steering cir-
cuit. A hose (2, Figure 19-1) attached to a "T" fitting at
the automatic lubrication system pump supply port
routes oil to the pressure reducing valve (3). This valve
reduces the steering circuit pressure, 24 132 kPa
(3500 psi) to 10 342 kPa (1500 psi). The pressure is
further reduced to 517 kPa (75 psi) by the pressure
reducing valve (4) which supplies the shutter solenoid
valve (5) to pressurize the head end of the shutter actu-
ator cylinder (11), closing the shutters during engine
warm-up. When the shutters are signalled to open, the
solenoid valve will be de-energized and the spool will
shift to direct oil to the rod end of the actuator cylinder.
Oil returns to tank through the hose (10) routed to the
hydraulic tank.
Radiator Shutters
M19-3
Advertisement
Chapters
Table of Contents
