FUEL SYSTEMTESTING AND ADJUSTINGTM 5-3805-263-14&P-2GOVERNOR ADJUSTMENTSLow and High Idle AdjustmentCAUTIONA mechanic with training in governor adjust-ments is the only one to make the adjustmentto the low idle and high idle rpm.Engine rpm must be checked with an accuratetachometer. Make reference to MEASURING EN-GINE SPEED.NOTE: The correct low idle and high idle rpm are inthe FUEL SETTING INFORMATION.To help prevent an accident caused by parts inrotation, work carefully around an engine thathas been started.Start the engine and run until the temperature ofnormal operation is reached. Check low and high idlerpm with no load on the engine. If an adjustment isnecessary, use the procedure that follows:1. To adjust the LOW IDLE rpm, start the engineand run with the governor in the low idle posi-tion. Loosen the locknut for low idle screw (2).Turn the low idle screw to get the correct low idlerpm. Increase engine speed and return to low idleand check low idle speed again. Tighten thelocknut.2. To adjust the HIGH IDLE rpm, cut the lockwireand remove cover (1). Start the engine and runwith the governor in the high idle position. Loo-sen the locknut for high idle screw (3). Turn thehigh idle screw to get the correct high idle rpm.Decrease engine speed and return to high idleand check high idle rpm again. Tighten the lock-nut and install cover (1) and lockwire and seal.Dashpot Screw AdjustmentThe dashpot adjustment screw does not normallyneed adjustment from the factory setting. If the en-gine is slow to change rpm with a change in load, it ispossible that the dashpot adjustment screw is notadjusted correctly.1-55
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