September 2016 Service and Repair ManualWire Circuit LegendPart No. 1268556 157Circuit numbering1 Circuit numbers consist of three parts: thecircuit prefix, circuit number and circuit suffix.The circuit prefix indicates the type of circuit.The circuit number describes the function ofthe circuit. The circuit suffix provides anabbreviation for the number or may be used tofurther define the function of this portion of thecircuit. It also may be used to indicate the finalend of the circuit, i.e., LS or limit sw.2 The circuit number may be used more thanonce in a circuit.For Example:C 74 PL – This is the circuit for the lockout valve #1.C stands for control, 74 is the number of the circuitfor the primary #1 lock out valve. PL stands forPrimary Lockout.S 62 BST – This is the circuit that communicates tothe onboard computers of the machine that theboom is fully stowed. S stands for safety, 62 is thenumber of the circuit for boom stowed and BSTstands for Boom Stowed.P 48 LP – P stands for power. 48 is the circuitnumber for work lamps and LP stands for Lamp.R 48 LP – R stands for relay. In this case it is thewire that feeds the relay coil for the work lamp. Allother numbers remain the same.V61AXR – V stands for valve power. Number61 stands for axle retracted circuit; AXR stands forAxle retracted.R46HRN – R stands for Relay output, supplyingpower to the horn (HRN). Number 46 is the circuitnumber for the horn.Circuit prefixC ControlD DataE EngineG GaugesN NeutralP PowerR Relay OutputS SafetyV Valve
