Inspection

1. INSPECT ARMATURE COIL

(a) Check the commutator for open circuit.

Using an ohmmeter, check that there is continuity between the segments of the commutator. If there is no continuity between any segment, replace the armature.

(b) Check the commutator for ground.

Using an ohmmeter, check that there is no continuity between the commutator and armature coil core. If there is continuity, replace the armature.

(c) Check the commutator for dirty and burnt surface.

If the surface is dirty or burn, correct with sandpaper (No.400) or a lathe.

(d) Check for the commutator circle runout.

(1) Place the commutator on V-blocks.

(2) Using a dial gauge, measure the circle runout. Maximum circle runout: 0.05 mm (0.0020 in.)

If the circle runout is greater than maximum, correct it on a lathe.

(e) Using vernier calipers, measure the commutator diameter.

Standard diameter: 28.0 mm (1.102 in.) Minimum diameter: 27.0 mm (1.063 in.)

If the diameter is less than minimum, replace the armature.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook


Post a comment