MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Page
Date
16
2006
Rev Date
24--39--04 -- STARTER TROUBLESHOOTING
TROUBLE
PROBABLE CAUSE
REMEDY
Motor fails to operate.
Low battery.
Check & recharge battery if reqd.
Defective, improper, or loose wire
connections.
Refer to electrical wiring diagram &
check all wiring.
Binding, worn, improperly seated
brushes or brushes have exces-
sive side play.
Brushes should fit free in brush
boxes without excessive side play.
Clean binding brushes & brush
boxes with Varsol moistened cloth.
A new brush should be run--in until
at least 50% seated; if facilities are
not available for running in
brushes, seat brush by inserting a
strip of No. .0000 sand-- paper be-
tween brush & commutator with
sanded side next to brush.
Pull sandpaper in direction of rota-
tion, being careful to keep it in
same contours as commutator.
CAUTION: Do not use coarse sandpaper or emery cloth.
Motor fails to operate. (Contd.)
After seating, thoroughly clean
brushes and commutator to pre-
vent excessive wear. Keep motor
bearing free from sand or metal
particles.
Dirty commutator.
If commutator is rough or dirty,
smooth and polish with No. 0000
sandpaper.
If too rough and pitted, remove
commutator and turn down. Blow
out all foreign material.
Shorted, grounded, or open arma-
ture.
Remove and replace with an arma-
ture known to be in good working
order.
Grounded or open field circuit.
Test and repair circuit if possible or
replace with new parts.
Slow cranking speed.
Worn, rough, or improperly lubri-
cated motor or starter.
Disassemble, clean, inspect, and
relubricate components, replacing
ball bearing, if worn.
Same causes as listed with “Motor
fails to operate.”
Same remedies.
Excessive motor brush arcing.
Binding, worn, improperly seated
brush or brushes have excessive
side play.
Repair as outlined above.
Dirty, rough, pitted, or scored com-
mutator.
Clean as outlined.
Excessive motor brush wear and
arcing
Rough or scored commutator.
Remove and turn down commuta-
tor on lathe.
Armature assembly not concentric. Reface commutator.
24--39--04
Summary of Contents for M20TN
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Page 151: ...MOONEY AVIATION COMPANY INC M20TN SERVICE MAINTENANCE MANUAL CHAPTER 21 ENVIRONMENTAL SYSTEMS ...
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