Manual 36541
Solenoid Troubleshooting Guide
Woodward
11
Chapter 3.
Detailed Troubleshooting
Preliminary Check
The purpose of this check is to do a quick visual scan of the setup and look for
some obvious damage or problem. Frequently, such an inspection can save a
technician valuable time and effort.
1. Check for broken parts. Inspect the rubber boot. A torn boot can allow dirt to
enter and increase the drag or friction on the plunger.
2. Check for blown fuse, broken wires or loose connections. Check for burned
out solenoid coil—usually evident by pungent odor.
3. Check the solenoid mounting. Look for loose mounting screws that can
cause misalignment, resulting in reduced solenoid force.
4. Check the location. Although the solenoid is designed to operate in harsh
environments, locations with excessive heat buildup, constant exposure to
liquid and particulate contaminants can effect the solenoid operation.
Power to the Solenoid
1. Disconnect the solenoid from the linkage and the control lever. Apply power
and see if the solenoid pulls in. If the solenoid pulls in, it is getting power to
operate.
2. If the solenoid does not pull in, check voltage at the connector and confirm
at least 10 Vdc is being delivered to a 12 Vdc system and 20 Vdc to a
24 Vdc system. This is the minimum acceptable voltage.
3. If the voltage reading is not acceptable, check the wiring harness and make
sure battery voltage at the battery posts is within manufacturer’s
specifications. Replace battery if needed.
4. If the voltage readings are acceptable, but the solenoid does not pull in,
prepare to remove the solenoid from the application and test it on the
bench.
