F510 & F525 Starter – TEST STARTER ARMATURE
IMPORTANT: DO NOT clean armature with solvent.
Solvent can damage insulation on windings. Use only mineral spirits and a brush.
1. Locate short circuits by rotating armature on a growler while holding a hacksaw blade or steel strip on armature.
The hacksaw blade will vibrate in area of short circuit.
2. Shorts between bars are sometimes caused by dirt or copper between bars. Inspect for this condition.
IF TEST INDICATES SHORT CIRCUITED WINDINGS; clean the commutator of dust and fillings. Check armature again.
IF TEST STILL INDICATES SHORT CIRCUIT; replace armature.
3. Test for grounded windings using an ohmmeter or test light.
NOTE: Armature windings are connected in parallel, so each commutator bar needs to be checked.
IF TEST SHOWS CONTINUITY; a winding is grounded and the armature must be replaced.
4. Test for open circuited windings using an ohmmeter or test light.
IF TEST SHOWS NO CONTINUITY; there is an open circuit and armature must be replaced.