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TRUCK GROUP SERVICE MANUAL
TM 5-4210-230-14&P-1
GENERAL
Figure 23 Secondary Control Valve Operation Below Governed Speed
1. Air Filter (Some Carburetors)
3. Increased Vacuum From Primary Venturi Opens
2. Control Valve (Closed by Diaphragm Spring Tension)
Secondary Throttle Valve
4. Fresh Air Passage
Figure 24 Secondary Control Valve Operation at Governed Speed
1. Air Filter
4. Air Flow Weakens Vacuum in Diaphragm Chamber and Spring
2. Fresh Air Passage
Closes Secondary Throttle Plates
3. Air Passage Removed When Air Filter Used
5. To Governor Vacuum Passage
6. When Governor "Spinner" Valve Closes, Governor Vacuum
Opens Control Valve Diaphragm and Valve. Fresh Air
Flows into Secondary Diaphragm Chamber
CGES-125-T Page 15
PRINTED IN UNITED STATES OF AMERICA
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