Inspection - Tecumseh ECV105 Technician's Handbook

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. 36 & 37).
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. 38). 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.
39). If any is noted the armature must be replaced.
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 (cupped side faces towards the end cap) on the end of the armature and then 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.
58
FIELD COIL
FIELD COIL
CONNECTORS
CONNECTORS
BRUSH
SPRINGS
12 VOLT 36
38
CONNECTION POINT OF
POWER CORD LEADS
37
120 VOLT
39