Part No. 65196 Genie S-60 & Genie S-65 7 - 9Third Edition • First Printing Section 7 • Repair Procedures1-2Horsepower Limiter BoardThe horsepower limiter board (HPL) is responsiblefor governing drive pump output. Receiving enginerpm signals from the alternator, the HPL senses adrop in rpm normally due to increased driveresistance due to operation on an incline or overrough terrain. Instantly, the HPL decreases voltageto the drive controller which in turn decreasesvoltage to the drive pump. Decreased voltageadjusts the output of the drive pump to maintainpeak engine performance.For optimum performance, three adjustments arerequired.How to Adjust the HorsepowerLimiter BoardThe engine rpm must becorrect before performing thisprocedure. See MaintenanceProcedure B-6,Check andAdjust the Engine RPM.Do not adjust the horsepowerlimiter board unless the staticbattery voltage is above 12V DCand the alternator is operatingproperly with 12.5 to 14.5V DCoutput.Gasoline/LPG models: Performthis procedure in gasoline mode.1 Remove the fasteners from the platformcontrol box lid.2 Open the control box lid and locate thehorsepower limiter board.Electrocution hazard. Contactwith electrically charged circuitscould result in death or seriousinjury. Remove all rings, watchesand other jewelry.Platform control boxa horsepower limiter board3 Connect the black(-) lead from a DC volt meterto the number 2 terminal, and the red(+) lead tothe number 10 terminal.Horsepower limiter boarda "A" trimpot maximum voltageoutput to the drive controller in thestowed positionb "B" trimpot maximum voltageoutput to the drive controller in theboom raised or extended positionc "C" trimpot reaction rate or howfast the voltage output reacts tothe change in engine rpmPLATFORM CONTROLS12V DC or greatergroundengine rpm sensornot usednot usedlow drive speed limit switchnot usednot usednot usedoutput to drive controllerbaca
