Lexus SC300 / Lexus SC400. Manual - part 728

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

SST 09201–41020

Magnetic Switch

1. 

PERFORM PULL–IN COIL OPEN CIRCUIT TEST
Using an ohmmeter, check that there is continuity between
terminals 50 and C.
If there is no continuity, replace the magnetic switch.

2. 

PERFORM HOLD–IN COIL OPEN CIRCUIT TEST
Using an ohmmeter, check that there is continuity between
terminal 50 and the switch body.
If there is no continuity, replace the magnetic switch.

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STARTING SYSTEM

Starter

ST–21

ASSEMBLY OF STARTER

(See Components on page 

ST–15

)

HINT: Use high–temperature grease to lubricate the bearings
and gears when assembling the starter.

1. 

PLACE ARMATURE INTO FIELD FRAME
Apply grease to the armature bearings, and insert the arma-
ture into the field frame.

2. 

INSTALL BRUSH HOLDER
(a)  Align the claw of the brush holder with the claw groove

of the field frame.

(b)  Place the brush holder on the field frame.

(c)  Using a screwdriver, hold the brush spring back, and

connect the brush into the brush holder. Connect the
four brushes.

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

3. 

INSERT STEEL BALL INTO CLUTCH SHAFT HOLE
(a)  Apply grease to the steel ball.
(b)  Insert the steel ball into the clutch shaft hole.

4.  INSTALL CLUTCH ASSEMBLY, GEARS AND STARTER

HOUSING
(a)  Apply grease to the return spring.
(b)  Insert the return spring into the magnetic switch hole.

ST–22

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STARTING SYSTEM

Starter

(c)  Place the following parts in position on the starter

housing:

(1) Clutch 

assembly

(2) Idler 

gear

(3) Bearing
(4) Pinion 

gear

(d)  Install the starter housing to magnetic switch with the

two screws.

5. 

INSTALL FIELD FRAME AND ARMATURE ASSEMBLY
(a)  Install a new O–ring to groove of the field frame.

(b)  Align the claws of the brush holder with the grooves of

the magnetic switch, and install the field frame and
armature shaft assembly.

(c)  Align the punch mark of the field frame with the line of

the magnet switch.

(d)  Install a new O–ring to through bolt A.
(e)  Install the spring washer, plate washer, wire bracket and

a new O–ring to through bolt B.

(f)  Install the two through bolts.

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STARTING SYSTEM

Starter

ST–23

(g)  Connect the lead wire to terminal C, and install the nut.

PERFORMANCE TEST OF STARTER

NOTICE: These tests must be performed within 3 to 5 se-
conds to avoid burning out the coil.

1. 

PERFORM PULL–IN TEST
(a)  Disconnect the field coil lead wire from terminal C.
(b) Connect battery to the magnetic switch as shown.

Check that the pinion gear moves outward.

If the pinion gear does not move, replace the magnetic
switch.

2. 

PERFORM HOLD–IN TEST
While connected as above with the pinion gear out, discon-
nect the negative (–) lead from terminal C.
Check that the pinion gear remains out.
If the pinion gear returns inward, replace the magnetic switch.

3. 

INSPECT PLUNGER RETURN
Disconnect the negative (+) lead from the switch body. Check
that the pinion gear returns inward.
If the pinion gear does not return, replace the magnetic
switch.

4. 

PERFORM NO–LOAD PERFORMANCE TEST
(a)  Connect battery and ammeter to the starter as shown.
(b) Check 

that the starter rotates smoothly and steadily with

the pinion gear moving out.
Check the reading on the ammeter.

Standard amperage: 120 A or less at 11.5 V

ST–24

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STARTING SYSTEM

Starter