Alternator: Testing and Inspection

3UR-FE BATTERY / CHARGING: GENERATOR: INSPECTION

1. INSPECT GENERATOR ROTOR ASSEMBLY

(a) Check the rotor for an open circuit.





(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for 130 A Type





for 150 A Type





for 180 A Type





If the result is not as specified, replace the rotor assembly.

(b) Check if the rotor is grounded.





(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





If the result is not as specified, replace the rotor assembly.

(c) Check that the slip rings are not rough or scored.

If rough or scored, replace the rotor assembly.

(d) Using a vernier caliper, measure the slip ring diameter.





Standard diameter:

14.2 to 14.4 mm (0.559 to 0.567 in.)

Minimum diameter:

14.0 mm (0.551 in.)

If the diameter is less than the minimum, replace the rotor assembly.

2. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY





(a) Using a vernier caliper, measure the exposed brush length.

Standard exposed length:

10.5 mm (0.413 in.)

Minimum exposed length:

4.5 mm (0.177 in.)

If the exposed length is less than the minimum, replace the brush holder assembly.

3. INSPECT GENERATOR DRIVE END FRAME BEARING

(a) When rotating the bearing, check that there is no abnormal noise and that it rotates smoothly.





If necessary, replace the bearing.

4. REPLACE GENERATOR DRIVE END FRAME BEARING





(a) Remove the 4 screws and retainer plate.

(b) Using SST and a hammer, tap out the bearing.

SST : 09950-60010

09951-00250

SST : 09950-70010

09951-07100





(c) for 130 A, 150 A Type:

Install the generator drive and frame bearing.

(1) Using SST and a press, press in a new bearing.





SST : 09950-60010

09951-00470

SST : 09950-70010

09951-07100

(2) Install the retainer plate with the 4 screws.

Torque : 2.3 Nm (23 kgf-cm, 20 in-lbf)





(d) for 180 A Type:

Install the generator drive end frame bearing.

(1) Using SST and a press, press in a new bearing.





SST : 09950-60010

09951-00500

SST : 09950-70010

09951-07100

(2) Install the retainer plate with the 4 screws.

Torque : 3.0 Nm (30 kgf-cm, 26 in-lbf)





5. INSPECT GENERATOR ROTOR BEARING

(a) When rotating the bearing, check that there is no abnormal noise and that it rotates smoothly.





If necessary, replace the generator rotor.