SWITCH - PUSH PULL 0871775 - Caterpillar

Illustration 1 g00788933
Schematic of the work tool solenoidThis procedure is used when the solenoid valve that controls the work tool does not operate correctly, and there are no active diagnostic codes.Test Step 1. CHECK FOR POWER
Turn the key start switch to the OFF position.
Disconnect the machine harness connector at the foot switch for the work tool.
Turn the key start switch to the ON position.
At the main relay, measure the voltage from wire 308-YL to wire 200-BK.Expected Result:The voltage is 18 to 24 DCV.Results:
The voltage is 18 to 24 DCV. The circuit for the key start switch is correct. - Proceed to Test Step 2.
The voltage is not 18 to 24 DCV. There is a problem with the circuit for the key start switch. - Repair: Troubleshoot the starting system. Go to Testing and Adjusting, RENR3814, "No Power Supply To Controller - Troubleshoot" Stop.Test Step 2. CHECK THE WIRING HARNESS FOR THE FOOT SWITCH
At the machine harness connector for the foot switch, measure the voltage between contact 1 and frame ground.Note: The electrical system schematic refers to the foot switch as "ATCH HAMMER FOOT SW".Expected Result:The voltage measurement is 18 to 24 DCV.Results:
The voltage is 18 to 24 DCV. The + battery circuit for the foot switch is correct. - Proceed to Test Step 3.
The voltage is not 18 to 24 DCV. The + battery circuit for the foot switch has failed. - Repair: Replace the machine harness or repair the machine harness. Stop.Test Step 3. CHECK THE FOOT SWITCH
The machine harness remains disconnected from the foot switch.
At the harness connector for the foot switch, measure the resistance from contact 1 to contact 2. Note the resistance and press the foot switch. Measure the resistance again.Expected Result:The resistance changes from less than 5 ohms to being greater