Caterpillar — Breakaway Test Procedure
Testing & diagnosis · E/H actuator and breakaway switch
From a Caterpillar owner's manual — check it applies to your exact model before use.
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Before you start
- Do not leave the breakaway switch pulled for more than two minutes during any of the steps.
Procedure
- Pull the breakaway switch on the trailer.
- Do not leave the breakaway switch pulled more than two minutes during any step.
- If unit runs and builds pressure, actuator is fine; check controller and tow vehicle wiring.
- If unit runs but will not build pressure, solenoid valve likely defective; return actuator for repair.
- If unit does not run, verify voltage between white and yellow wires is at least 12 volts.
- Voltage less than 12 volts means breakaway switch or wiring defective; greater than 12 volts means return unit for repair.
Tools required
- voltmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Voltage between white and yellow wires at least 12 volts
Source: Caterpillar owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.