BENCH TEST
1. After starting motor is reassembled, test it to see that no-load current at a certain voltage is within
specifications given in Starting Motor Service Test Specifications. To make this test, connect as shown
in figure 80-5. If current is too high, check bearing alignment and end play to make sure there is no
binding or interference. Two or three sharp raps on frame with a raw hide hammer will often help to
align bearings and free armature.
2. If no difficulty is indicated in above test, a stall torque test may be made to see if starting motor is
producing its rated cranking power. Make test connections as shown in figure 80-6.
3. If torque and current are not within specifications, check seating of brushes and internal connections
for high resistance. If these checks are made and starter is found to be in good order, replace frame and
field assembly and retest starter.
STARTING MOTOR CONTROL CIRCUIT
1. Inspect control circuit wiring between battery, solenoid, and manual starting switches for breaks, poor
connections, and faulty insulation. Tighten all connections, make sure solenoid is firmly mounted, and
ensure a good ground connection.
—NOTE—
If a solderless terminal on an aluminum cable is loose, corroded
or otherwise unsatisfactory, it is recommended that the complete
cable assembly be replaced instead of replacing or repairing the
solderless terminal. Should replacement of the complete assembly
not be practical, it is permissible to replace the aluminum cable
assembly with a copper cable assembly which is two sizes smaller
(EX: An AL-1 aluminum cable assembly is replaced with an AN-
3 copper cable assembly). Install new cable in accordance with C-
43-13-2A .
2. Check voltage loss across switch contacts during normal starting. If loss is in excess of 0.2-volts per
100 amperes, replace solenoid.
3. If solenoid fails to operate when manual starting switch is turned on or if it fails to release when
manual starting switch is released, remove and test it to specifications. Replace solenoid if either
opening or closing voltages are not to specifications.
80 - 12 - 00
Page 80 - 09
Reissued: August 1, 1986
2L5
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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