Lexus RX300 (MCU15). Service manual — part 180

CH07E–02

B12258

Pivot Bolt

Adjusting
Lock Bolt

Adjusting Bolt

B12259

CH–6

–

CHARGING

ALTERNATOR

LEXUS RX300 (RM785E)

REMOVAL

1.

REMOVE DRIVE BELT

Loosen the pivot bolt, adjusting lock bolt, and adjusting bolt,
and remove the drive belt.

Torque:
Pivot bolt: 56 N·m (570 kgf·cm, 41 ft·lbf)
Lock bolt: 18 N·m (180 kgf·cm, 13 ft·lbf)

2.

REMOVE ALTERNATOR

(a)

Disconnect the alternator connector.

(b)

Remove the nut, and disconnect the alternator wire.

(c)

Disconnect the wire harness from the clip.

(d)

Remove the pivot bolt, plate washer, adjusting lock bolt
and alternator.

CH0G6–01

B12260

B12261

P10835

SST (B)

SST (A)

Turn

P10834

SST (C)

SST (B)

Insert

P10827

SST (C)

SST (A)

Turn

–

CHARGING

ALTERNATOR

CH–7

LEXUS RX300 (RM785E)

DISASSEMBLY

1.

REMOVE REAR END COVER

(a)

Remove the 3 nuts and end cover.

(b)

Remove the terminal insulator.

2.

REMOVE BRUSH HOLDER

(a)

Remove the rear seal plate from the brush holder.

(b)

Remove the 2 screws and brush holder.

(c)

Remove the front seal plate from the coil assembly.

3.

REMOVE PULLEY

(a)

Hold SST (A) with a torque wrench, and tighten SST (B)
clockwise to the specified torque.
SST

09820–63010

Torque: 39 N·m (400 kgf·cm, 29 ft·lbf)

(b)

Check that SST (A) is secured to the rotor shaft.

(c)

Mount SST (C) in a vise.

(d)

Insert SST (B) into SST (C), and attach the pulley nut to
SST (C).

(e)

To loosen the pulley nut, turn SST (A) in the direction
shown in the illustration.

NOTICE:
To prevent damage to the rotor shaft, do not
loosen the pulley nut more than one–half of a turn.
(f)

Remove the alternator from SST (C).

P10836

Turn

SST (A)

SST (B)

B12262

B12263

SST

CH–8

–

CHARGING

ALTERNATOR

LEXUS RX300 (RM785E)

(g)

Turn SST (B), and remove SST (A and B).

(h)

Remove the pulley nut and pulley.

4.

REMOVE COIL ASSEMBLY

(a)

Remove the 4 bolts.

(b)

Using SST, remove the coil assembly.
SST

09950–40011 (09951–04020, 09952–04010
09953–04020, 09954–04010, 09955–04071,
09958–04011)

(c)

Remove the alternator washer.

5.

REMOVE ROTOR FROM DRIVE END FRAME

CH0G7–01

B12264

Ohmmeter

Continuity

B12265

Ohmmeter

No Continuity

B12266

P13535

Length

–

CHARGING

ALTERNATOR

CH–9

LEXUS RX300 (RM785E)

INSPECTION

1.

INSPECT ROTOR

(a)

Check the rotor for open circuit.
Using an ohmmeter, check that there is continuity be-
tween the slip rings.
Standard resistance:
2.3 – 2.7 Ω at 20

°C (68°F)

If there is no continuity, replace the rotor.

(b)

Check the rotor for ground.
Using an ohmmeter, check that there is no continuity be-
tween the slip ring and rotor.

If there is continuity, replace the rotor.

(c)

Check that the slip rings are not rough or scored.

If rough or scored, replace the rotor.
(d)

Using vernier calipers, measure the slip ring diameter.
Standard diameter:
14.2 – 14.4 mm (0.559–0.567 in.)
Minimum diameter:
14.0 mm (0.551 in.)

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

2.

INSPECT BRUSHES

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 minimum, replace the brushes
and brush holder assembly.
3.

INSPECT BEARING

Check the bearing is not rough or worn.
If necessary, replace the bearing. (See page CH–10)