HARNESS ASSEMBLY-SWITCH 3168501 - Caterpillar

Table 1
Required Tools    
Part Number    Part Description    Qty    
8T-0859     Pressure Gauge     1    
6V-3989     Unvalved Nipple     1    
6V-4143     Coupler Assembly     2    
6V-3014     Hose     1    Performing the following test procedures will help to determine if the cut out pressure is correct and if the low brake pressure indicator functions correctly. The following test procedures will also help determine if the precharge pressure for the accumulators is correct.Test
Illustration 1 g00850540
Located under the cab (1) Service brake accumulator charging pressure (2) Low brake oil pressure switch
Stop the engine.
Use Steps 2.a and 2.b to release the pressure in the service brake accumulator charging system:
Engage the parking brake.
Depress the service brake pedal repeatedly until there is no brake oil pressure.
Connect two 25000 kPa (3600 psi) pressure gauges to pressure taps (1) .
Observe the pressure gauges. Before you start the engine, the oil pressure must be 0 kPa (0 psi).
Start the engine and place the engine speed at the HIGH IDLE position.
Allow the oil pressure to increase to the cut out pressure. Check the pressure at pressure taps (1) when the pressure stops increasing. Refer to Testing and Adjusting, "Specifications" in this manual for the