farm duty motors usually consist of induction split phase motors designed for heavy work. Since the phase motors use a separate winding starting, they require a starting capacitor in the circuit to provide more power to start. Failure of phase shift induction motor is often corrected by the repair function of capacity, as described.

Diagnose faults capacitor
Step 1
Try to start the engine. At present a failure, the motor hums but will not start.

Step 2
overcome the rule of the centrifugal switch from the rotor axis is at hand. If the tree is frozen, the problem is the key, and to be replaced.

Step 3
If the rotor shaft rotates freely by hand, try to start the engine. If it begins to change or is defective or stuck closed and the engine stops. Use electrical contact to clean the key. Replace the key if cleaning does not solve the problem.

Step 4
Take a faulty centrifugal switch as above before taking a function of a capacitor failure.
Once this option has been ruled out, an engine that continues to hum (currently), but is to start very low or zero may be the result of an open circuit or short in the capacitor.

Troubleshooting capacitor
Step 1
 
  
CapacitorLocate motor mounted capacitor, which is usually mounted on the side of the induction motor.

Step 2
Remove electrical cords of the two male contacts on the front of the condenser.

Step 3
 
  
volt ohmmeter capcitors terminalsSet the RX 100 and connect the positive and son volt ohmmeter to the two negative contacts of the capacitor.

Step 4
Note the meter reading. If the needle jumps immediately to zero ohms and slowly drift back to a high ohm reading, the capacitor is functional and is not the problem.

Step 5
   
Volt-Ohm Ohm regular reading of meter reading files which contained zero ohms or ohms stable level indicates that the capacitor is defective and must be replaced