Craftsman 143.991200 Specifications download pdf (Page 52)

12 VOLT

120 VOLT

BRUSH

SPRINGS

CONNECTION POINT OF

POWER CORD LEADS

FIELD COIL

CONNECTORS

FIELD COIL

CONNECTORS

Inspection And Repair

1. The pinion gear parts should be checked for

damage or wear. If the gear does not engage

or slips, it should be washed in solvent (rubber

parts cleaned in soap and water) to remove dirt

and grease, and dried before reassembly. Also

check the armature and drive nut splines for

wear or damage. Replace parts as necessary.

2. The brushes and brush card holder should be

checked for wear. With the armature in place

and the brushes engaging the commutator

surface, check the brushes for wear. Brushes

should be replaced if the brush wire approaches

the bottom of the brush holder slot. Brush

springs must exhibit enough strength to keep

tension on the brushes and hold them on the

commutator.

3. The field windings can be checked using a

continuity light or ohmmeter. Attach one lead

to each field coil connection. Continuity should

exist between each field coil connection, and

no continuity should exist between the field coil

connections and the starter housing (diag. 32

& 33).

4. The armature should be checked for glazing or

wear. If necessary the armature can be turned

down in a lathe. While rotating, polish the

commutator bars using a piece of 00 sandpaper

(diag. 34). Light pressure and back and forth

movement should be used. Recut the

commutator bars to a depth equal to the width

of the insulators between the bars. Check for

continuity between the copper commutator bars

and the iron of the armature, none should exist

(diag. 35).

34 35

Brush Card Replacement

1. Loosen but do not remove the two nuts on the starter terminal post.

2. Remove the nuts holding the end cap in place. Remove the end cap and the thrust washer.

3. Grasp the thru bolts using a vise grip positioned as close to the flanged end as possible to prevent

thread damage. Remove the two nuts holding the driving end cap in place. Remove the armature and

driving cap assembly, followed by the two thru bolts. Notice the position of the brush ground eyelet under

the thru bolt flange.

4. Note or mark the position of the connectors of the brush wires. Use a wire cutter to clip the solid field

wires as close to the connectors as possible.

5. Note or mark the brush card in the starter housing, and remove the brush card assembly. Clean the

accumulated dirt off all starter parts. Scrape the insulating varnish off the last 1/2" (12.7 mm) of the solid

field wires.

6. Insert the new brush card into position while guiding the solid field wires through the proper slots in the

brush card.

7. Crimp and solder the brush leads to the solid field wires. Use a needle nose pliers or vise grip to hold the

woven brush lead close to the connector while soldering. This prevents solder and heat from flowing up

the brush lead. Insulate the crimped connection nearest the starter terminal post using electrical tape or

heat shrink tubing. Route the wires to prevent damage during assembly.

8. Install the armature into the housing while spreading the brushes. Install the thru bolts while checking to

make sure the bolts go thru the ground brush eyelet terminals. Install and tighten the drive end thru bolt

nuts, but do not overtighten.

9. Install the thrust washer on the end of the armature and the install the starter end cap. Secure the cap

with the locking nuts and tighten the nut on the starter terminal post. Rotate the armature by hand to

check for binding before installation on the engine.

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Craftsman 143.991200 Specifications Page 52

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