AD15.30-B-0002A | Starter troubleshooting | 12.02.16 |
Cumbustion engine 457.9, 904.9, 906.9, 924.9, 926.9
Troubleshoot | Possible causes | Possible solution | |
1 Current flow with an open test circuit switch | Solenoid switch contact glued | Test the solenoid set measuring the resistance between the engine end piece and the solenoid case (ignition coil winding resistance and hold coil in series). Replace it if the resistance is out of specification. | |
| |||
2 Operation showing low or no current | 2a Winding broken solenoid | Test the solenoid set measuring the resistance between the engine end piece and the solenoid case ((ignition coil winding resistance and hold coil in series). Replace it if the resistance is out of specification. | |
| |||
2b Broken filed circuit | Test the field set and structure. | ||
| Field set and structure. | ||
2c Winding broken armature or high isolation between the commuting bars | Test the armature. | ||
| Armature. | ||
2d Broken brush spring(s) or worn brushes | Inspect brushes and springs. | ||
3 Operation presenting high current. | 3a Hard bearing (locked) or other damage on the drive | Check bearing, armature and drive axle. | |
3b Straight ground on end pieces or fields | Test the field and framework installations, brush, armature and solenoid set looking for short-circuit. | ||
| Armature. | ||
Field set and structure. | |||
4 Operation with high current and low rotation | 4a Excessive friction on bearing or reduction unit, bent armature axle, or loose pole shoe, bent drive axle | Check bearings, armature and drive axle. | |
4b Armature in short-circuit | Test the armature. | ||
| Armature. | ||
4c Grounded armature or fields | Test the field coil set and structure. | ||
| Field set and structure. | ||
5 Operation with regular or low current and low rotation | 5a High internal resistance caused by bad connections, damaged wire or dirty change-over switch | Check internal wires, electric connections and the armature change-over switch. | |
| Armature. | ||
5b Causes listed in "Operation showing low or no current" | Corrections listed in "Operation showing low or no current". | ||
6 Operation with high current and high rotation | Fields in short-circuit | Test the field set and structure. | |
| Field set and structure. |