TABLE 4TM 5-3805-258-24-19 5 0 B O P E R A T O R ’ S S T A T I ONE L E C T R I C A L T R O U B L E S H O O T I NGBrake Oil Pressure IndicatorThere are two brake oil pressure switches in the brake oil pressure indicatorcircuit. The two switches are wired in series (wired one after the other in acircuit). If either switch opens, the indicator will turn ON. When the travel ofthe foot lever goes too far on this brake system, the 7V5647 Brake Oil PressureSwitch, opens and turns ON the indicator.1. Remove the two wires from the 7V5647 Brake Oil Pressure Switch on themaster cylinder for the rear brakes. Put both wires to machine ground. If theindicator turns OFF, the problem is in one of the switches or its harness.Indicator Turns OFFIndicator Does NOT Turn OFFGo to Step 2.Problem is in operator’s panel or the harness fromthe panel to the switches.2. Check for continuity across each of the 7V5647 Brake Oil Pressure Switches.ContinuityNo ContinuityGo to Step 3.Replace the switch.3. Check for continuity from the 7V5647 switch on the master cylinder for thefront brakes to machine ground.ContinuityNo ContinuityThere is an open in the wire that goes from the frontRepair or replace the harness or connect a wire frommaster cylinder switch to the rear master cylinderthe switch ground connection to machine ground.switch. Repair or replace the harness.Hydraulic Temperature, Engine Coolant Temperature, OrTransmission Oil Temperature IndicatorFollow the instructions given at the first of the section on the monitoring system,to make sure the system is cool enough for the indicator to turn OFF. If theindicator does NOT turn OFF, make a check of the electrical system as follows:1. Disconnect the control wire from the temperature switch of the indicator thatis ON. (See TABLE 4).4-121
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