80-00-00 Page 80-5 Issued: April 1, 1997
CHART 8001. TROUBLESHOTTING (STARTER) (cont)
Trouble Cause Remedy
Starter fails to operate. (cont) Binding, worn, or improperly seated brush, or brushes with excessive side play. Brushes should be a free fit in in the brush boxes without excessive side play. Binding brushes and brush boxes should be wiped clean with a gasoline (undoped) moistened cloth. A new brush should be run in until at least 50 percent seated; however, if facilities are not available for running in brushes, then the brush should be properly seated by inserting a strip of number 000 sandpaper between the brush and com-mutator, with the sanded side next to the brush. Pull sandpaper in the direction of rotation, being careful to keep it in the same contour as the commutator. — CAUTION — DO NOT USE COARSE SANDPAPER OR EMERY CLOTH. AFTER SEATING, CLEAN THOROUGHLY TO REMOVE ALL SAND AND METAL PARTICLES TO PREVENT EXCESSIVE WEAR. KEEP MOTOR BEARING FREE FROM SAND OR METAL PARTICLES.
80-00-00 Page 80-6 Issued: April 1, 1997
3K6
CHART 8001. TROUBLESHOTTING (STARTER) (cont)
Trouble Cause Remedy
Starter fails to operate. (cont) Low motor and cranking speed. Excessive arcing of motor brushes. Excessive wear and arcing of motor brushes. Dirty commutator. Shorted, grounded, or open armature. Grounded or open field circuit. Worn, rough, or improperly Iubricated motor or starter gearing. Same electrical causes as listed under “Motor fails to operate.” Binding, worn, or improperly seated brush or brushes with excessive side play. Dirty commutator, rough pitted or scored. Rough or scored commutator. Armature assembly not concentric. If commutator is rough or dirty, smooth and polish with number 000 sandpaper. If too rough and pitted, remove and turn down. Blow out all particles. Remove and replace with an armature known to be in good condition. Test, repair if possible or replace with a new part. Disassemble, clean, inspect, and relubricate, replacing ball bearings if worn. Same remedies listed for these troubles. See information above dealing with this trouble. Clean as outlined above. Remove and turn commutator down on a lathe. Reface commutator.
80-00-00 Page 80-7 Issued: April 1, 1997
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80-00-00 Page 80-8 Issued: April 1, 1997
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CRANKING.
MAINTENANCE OF STARTING SYSTEM.
The starting system should be inspected at regular intervals, the frequency of which should be determined by the amount of service and the conditions under which the aircraft is operated. It is recommended that such inspection be made at each 100 hours and include the following:
1.
The battery should be checked with a hydrometer to be sure it is fully charged and filled to the proper level with approved water. A load test should be made to determine battery condition. If dirt and corrosion have accumulated on the battery, it should be cleaned with solution of baking soda and water.
2.
The starting circuit wiring should be inspected to be sure that all connections are clean and tight and that the insulation is sound. A voltage loss test should be made to locate any high resistance connections that would affect starting motor efficiency. This test is made with a low reading voltmeter while cranking the engine or at approximately 100 RPM. The following limits should be used:
A. Voltage loss from insulated battery post to starting motor terminal 0.3 volt maximum.
B. Voltage loss from battery ground post to starter frame 0.1 volt maximum.
— Note —
If voltage loss is greater than the above limits, additional tests should be made over each part of the circuit to locate the high resistance connections.
80-10-00 Page 80-9 Revised: February 28, 2002
3.
No lubrication is required on the starting motor except at the time of overhaul. Then lubricate the entire shaft under Bendix Drive, fill grooves in armature shaft at drive end and pack gear box with 1.3 to 2.0 ounces of Lithium Soap Base Grease 1925 Molytex “O” or equivalent.
4.
The starting motor should be operated for a few seconds with the ignition switch off to make sure that the pinion engages properly and that it turns freely without binding or excessive noise. Then the engine should be started two or three times to see that the pinion disengages properly when the engine is turned off.
OVERHAUL OF STARTING MOTOR.
If during the above inspection any indication of starting motor difficulty is noted, the starting motor should be removed from the engine for cleaning and repair.
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