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Engine Oil Pressure Gage Test
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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TM 5-4210-220-12 4.24.  ELECTRICAL SYSTEM - Continued 4-24.10  Sending Units and Warning Switches - Continued e. Engine Oil Pressure (Fuel Pump Shutdown) Test. NOTE This   oil   pressure   switch   will   cause   fuel priming  pump  to  stop  if  no  oil  pressure  is registered when engine is running. (1) Connect a voltmeter between priming pump relay terminal 35 and ground.  The relay is the middle one of three relays installed behind cab fold-down panel.  Voltmeter should read 12V. (2) Start main engine and check voltmeter reads at O volts. (3) Stop main engine and remove voltmeter. (4) If oil sender does not operate, replace oil sender. (5) If wire is broken replace wire 35 from sender to terminal 35 of the priming pump relay. (6) To check relay coil, connect voltmeter between terminal of relay and ground.  Voltmeter will read 12 volt.  When cab PRIME pushbutton is pressed, voltmeter should read 0 volts.  Replace relay if no voltage is read. f Ammeter Shunt Test. (1) Connect a voltmeter across terminals of the ammeter.  Shunt is mounted on the rear engine lifting bracket. (2) With engine ignition ON, crank main engine. Voltmeter should read approximately 1 volt. (3) Replace shunt if no reading is obtained. 4-450

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