3 - 14 S-60 • S-65 • S-60 HC Part No. 77828February 2012Section 3 • Scheduled Maintenance ProceduresCHECKLIST A PROCEDURESA-11Check and Adjust theEngine RPM - Perkins ModelsNote: Engine specifications require that thisprocedure be performed every 100 hours.Maintaining the engine rpm at the proper setting forboth low and high idle is essential to good engineperformance and service life. The machine will notoperate properly if the rpm is incorrect andcontinued use may cause component damage.Note: This procedure will require two people.1 Connect a tachometer to the engine. Start theengine from the ground controls and check therpm. Refer to Section 2,Specifications.Skip to step 3 if the low idle rpm is correct.2 Loosen the low idle lock nut and turn the low idleadjustment screw clockwise to increase therpm, or counterclockwise to decrease the rpm.Tighten the low idle lock nut and confirm therpm.a solenoid bootb high idle adjustment nutc yoked low idle lock nut and adjustmentscrew3 Move the function enable toggle switch to thehigh idle (rabbit symbol) position and note therpm. Refer to Section 2,Specifications.If high idle rpm is correct, disregard adjustmentstep 4.4 Loosen the yoke lock nut, then turn the high idleadjustment nut and solenoid bootcounterclockwise to increase the rpm orclockwise to decrease the rpm. Tighten theyoke lock nut and recheck the rpm.Note: Be sure the solenoid fully retracts whenactivating high idle.a b c d
