California Air Tools 3010 Service Manual Page 450

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17-30 ELECTRICAL SYSTEM
Alternator
Stator Coil Inspection
Connect the hand tester 1 range) between the coil
wires and read the tester.
Special Tool - Hand Tester: 57001-1394
If the tester does not read as specified, replace the alter-
nator frame.
Stator Coil Resistance: 0.2 or less
Using the highest hand tester range, measure the resis-
tance between the stator coil core and each of the coil
windings.
If there is any reading at all, the stator coil winding has a
short and the alternator housing must be replaced.
Rotor Coil Inspection
Connect the hand tester 1 range) between the slip
rings [A] and read the tester.
Special Tool - Hand Tester: 57001-1394
If the tester does not read as specified, replace the rotor
[B].
Rotor Coil Resistance: 2.8 3.0
Using the highest tester range, measure the resistance
between the rotor shaft and each of the slip rings.
If there is any reading at all, the rotor coil has a short and
must be replaced.
Slip Ring Cleaning
Visually inspect the slip ring for dirt or pitting.
If necessary, smooth the slip ring with No. 300 No. 500
emery cloth.
Slip Ring Diameter
Measure the diameter of the slip rings.
If the measurement is less than the service limit, replace
the rotor [A].
Slip Ring Diameter
Standard: 14.4 mm (0.57 in.)
Service Limit: 14.0 mm (0.55 in.)
Carbon Brush Length
Measure the length [A] that both carbon brushes that stick
out of the holder.
If either one is worn down to less than the service limit,
replace it.
Carbon Brush Length (Projected Portion)
Standard: 10.5 mm (0.41 in.)
Service Limit: 8.4 mm (0.33 in.)
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