CABLE, CONTR 0773055 - Caterpillar

Electrical Testing
Electrical connections between harnesses may not be tight. This can cause electrical problems, either permanent or intermittent (come and go). Make sure the connections at the front drive axle solenoid and the switch are tight before other tests are made.
5P7277 VOLTAGE TESTERThe 5P7277 Voltage Tester can be used to check for voltage at the solenoid when the switch is activated. It cannot measure voltage. The light will come on at a voltage indication between 12 and 36 volts.Pressure Testing
The transfer box contains a clutch pack for front wheel drive engagement. The pressure needed for proper clutch engagement is 1400 100 kPa (205 15 psi).Test Procedure
1. Remove plug from solenoid valve and install a 0 to 2000 kPa (0 to 290 psi) gauge and long hose.
INSTALL GAUGE2. Start the engine and run at high idle speed. At normal operating temperature, with gear selector in neutral and the forward-reverse selector in forward, activate the front wheel drive solenoid.3. Read pressure at the pressure gauge. If the oil pressure is not 1400 100 kPa (205 15 psi), refer to the POWER TRAIN TESTING AND ADJUSTING SECTION of Form SENR3132 Backhoe Loader Transmission (test for the transmission hydraulic system).