Toyota Sequoia (2005). Manual - part 723

B13806

P10568

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2881

4.

REMOVE BRUSH HOLDER

(a)

Remove the 2 screws w/ O–ring and the end cover from
the field frame.
Torque: 3.8 N·m (39 kgf·cm, 34 in.·lbf)

(b)

Remove the O–ring from the field frame.

HINT:
At the time of assembly, use a new O–ring.

(c)

Using a screwdriver, hold the spring back and disconnect
the brush from the brush holder. Disconnect the 4
brushes, and remove the brush holder.

NOTICE:
Check that the positive (+) lead wires are not grounded.
5.

REMOVE ARMATURE FROM FIELD FRAME

ST0N3–04

S00054

Ohmmeter

Continuity

S00055

Ohmmeter

No Continuity

S00056

S00057

ST0040

ST–8

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INSPECTION

1.

INSPECT 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 ar-
mature.

2.

INSPECT 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.
3.

INSPECT COMMUTATOR FOR DIRTY AND BURNT
SURFACE

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

4.

INSPECT COMMUTATOR CIRCLE RUNOUT

(a)

Place the commutator on V–blocks.

(b)

Using a dial indicator, 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.

5.

INSPECT COMMUTATOR DIAMETER

Using vernier calipers, measure the commutator diameter.

Standard diameter:
35.0 mm (1.378 in.)
Minimum diameter:
34.0 mm (1.339 in.)

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

6.

INSPECT UNDERCUT DEPTH

Check that the undercut depth is clean and free of foreign mate-
rials. Smooth out the edge.

Standard undercut depth:
0.7 mm (0.028 in.)
Minimum undercut depth:
0.2 mm (0.008 in.)

If the undercut depth is less than minimum, correct it with a
hacksaw blade.

P10588

Ohmmeter

Continuity

P00299

Ohmmeter

Continuity

S02267

Ohmmeter

(B)

(A)

Z00037

ST0019

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2883

7.

INSPECT FIELD COIL FOR OPEN CIRCUIT

Using an ohmmeter, check that there is continuity between the
lead wire and field coil brush lead.
If there is no continuity, replace the field frame.

8.

INSPECT SHUNT COIL FOR OPEN CIRCUIT

Using an ohmmeter, check that there is continuity between the
field coil end and field frame.
If there is no continuity, repair or replace the field frame.

9.

INSPECT SHUNT COIL FOR OPEN CIRCUIT

Using an ohmmeter, measure the resistance between shunt
coil terminals (A) and (B).

Resistance: 1.5 to 1.9 

Ω

 at 20 

°

C (68 

°

F)

If the resistance is not as specified, replace the field frame.

10.

INSPECT BRUSH LENGTH

Using vernier calipers, measure the brush length.

Standard length: 15.0 mm (0.591 in. )
Minimum length: 9.0 mm (0.354 in. )

If the length is less than minimum, replace the brush holder and
field frame.

11.

INSPECT BRUSH SPRING LOAD

Using a pull scale, measure the spring load by pulling the spring
from the brush until they are separated.

Standard spring installed load: 21.5 to 27.5 N ( 2.2 to
2.8 kgf, 4.8 to 6.2 lbf )
Minimum installed load: 12.7 N (1.3 kgf, 2.9 lbf )

If the installed load is less than minimum, replace the brush
springs.

P21088

Ohmmeter

No Continuity

P10821

Free

Lock

B12319

Terminal C

Terminal 50

Continuity

Ohmmeter

B12320

Continuity

Ohmmeter

Terminal 50

ST–10

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12.

INSPECT BRUSH HOLDER INSULATION

Using an ohmmeter, check that there is no continuity between
the positive (+) and negative (–) brush holders.
If there is continuity, repair or replace the brush holder.
13.

INSPECT GEAR TEETH

Check the gear teeth on the pinion gear, idle gear and the clutch
assembly for wear or damage.
If any damage is found, replace the gear or clutch assembly,
and also check the drive plate ring gear for wear or damage.

14.

INSPECT CLUTCH PINION GEAR

Rotate the pinion gear clockwise, and check that it turns freely.
Check that it locks by rotating the pinion gear counterclockwise.
If necessary, replace the clutch assembly.
15.

INSPECT FRONT AND REAR BEARING

Turn the bearing by hand as applying inward force.
If resistance is felt or the bearing sticks, replace the bearing.

16.

DO PULL–IN COIL OPEN CIRCUIT TEST

Using an ohmmeter, check that there is continuity between ter-
minals 50 and C.
If there is no continuity, replace the magnetic switch.

17.

DO HOLDING COIL OPEN CIRCUIT TEST

Using an ohmmeter, check that there is continuity between ter-
minal 50 and the switch body.
If there is no continuity, replace the magnetic switch.