Figure 11-37. Exploded View of Gear Reduction Staring Motor (PA-28R-201)
When the engine reaches a predetermined speed, centrifugal action forces the detent pin out of the notch in
the screw shaft and allows the pinion to demesh from the flywheel.
11-50. MAINTENANCE. The starting circuit 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:
a. 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 a solution of baking soda and
water. Be sure none of the solution enters the battery cells.
b. 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 amperes and the following limits should be used:
1. Voltage loss from insulated battery post to starting motor terminal -0.3-volt maximum.
2. 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.
Revised: 2/13/89
2H21
CHEROKEE ARROW III SERVICE MANUAL
ELECTRICAL SYSTEM
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