ST-14
STARTING SYSTEM - Starter
INSPECTION OF STARTER
Armature Coil
1. INSPECT THAT ARMATURE IS NOT GROUNDED
Using an ohmmeter, check that there is no continuity be-
tween the commutator and armature coil core.
If there is continuity, replace the armature.
2. INSPECT ARMATURE FOR OPEN CIRCUIT
Using an ohmmeter, check for continuity between the
segments of the commutator.
If there is no con tinuity between any segment replace the
armature.
Commutator
1. INSPECT COMMUTATOR FOR DIRTY ANO BURNT
SURFACES
If the surface is dirty or burnt correct with sandpaper !No.
400) or a lathe.
2 . INSPECT COMMUTATOR CIRCLE RUNOUT
Maximum circle runout: 0.05 mm (0.0020 in.)
If the circle runout is greater than the maximum , correct
with a lathe.
3. MEASURE DIAMETER OF COMMUTATOR
Using calipers, measure the diameter of the commutator.
Minimum diameter: 1.4 kW 29 mm (1.14 inJ
2.0 kW 34 mm (1.34 in.I
2.5 kW 35 mm (1.38 in.)
If the diameter of the commutator is less than the
minimum, replace the armature .
4 . INSPECT UNDERCUT DEPTH
Check that the undercut depth is clean and free of foreign
particles. Smooth out the edge.
Minimum undercut depth: 0 .2 mm (0.008 in.I
Standard undercut depth:
1.4 kW 0.5 - 0.8 mm (0.020 - 0.032 in.)
2.0 kW, 2.5 kW 0.7-0.9 mm (0.028 -0.035 in.)
If the undercut depth is less than the minimum, correct
with a hacksaw blade.
STARTING SYSTEM - Starter
ST-15
ST0019
sr..,.,
Field Coil
1. INSPECT FIELD COIL FOR OPEN CIRCUIT
Using an ohmmeter, check for continuity between the lead
wire and field coil brush lead.
If there is no continuity, replace the field coil .
2. INSPECT THAT FIEL.O COIL IS NOT GROUNDED
Using an ohmmeter, check for continuity between the
field coil end and field frame.
If there is continuity, repair or replace the field coil.
Brushes
INSPECT BRUSH LENGTH
Using calipers. measure each brush length.
Minimum length: 1.4 kW 10 .0 mm (0.39 4 in.I
2.0 kW 9.5 mm (0.374 in.)
2.5 kW 12.0 mm (0.472 in.)
Standard length : 1.4 kW 15.0 mm (0.591 in.I
2.0 kW 14 .5 mm (0.571 in.J
2.5 kW 20.5 mm (0.807 in.)
If length is less than the minimum, replace the-brush.
Brush Spring
MEASURE BRUSH SPRING LOAD WITH PULL SCALE
Take the pull scale reading at the very instant the brush
spring separates from the brush.
Minimum installed toad:
1.4 kW 1.44 kg (3.2 lb, 14 NJ
2 .0 kW 2.0 kg (4.4 lb, 20 NJ
2.5 kW 2.2 kg (4.9 lb, 22 N)
If the reading is minimum, replace the brush spring .
Brush Holder
INSPECT INSULATION OF BRUSH HOLDER
Using an ohmmeter, check for continuity between the
positive and negative brush holders.
If there is continuity, repair or replace the brush holder.
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