3-15. AUXILIARY STEERING PUMP AND MOTOR MAINTENANCE (CONT)
d. Auxiliary Steering Motor (Cont).
Connect auxiliary steering motor to test equipment as shown.
Close switch and look at voltmeter on tester. Turn tester load control
until voltmeter indicates 12 volts.
Record tester ammeter indication.
Hold tachometer against armature shaft. Record tachometer indication.
Set switch to off position.
Disconnect auxiliary steering motor and test equipment.
If ammeter indicated 30 amperes or less and tachometer indicated 6950 rpm
or more, auxiliary steering motor is okay. Join auxiliary steering pump
and motor (page 3-533).
If armature rpm was less than 6950 rpm and ammeter indication was higher
than 30 amperes, check for damaged bearings, short circuit in armature,
or a ground connection in field coil.
If armature did not turn and ammeter indication was higher than 30 am-
peres, check terminal studs for short circuit or check for a damaged
If armature did not turn and ammeter indication was zero, check for an
open field coil, open armature, or broken or worn brush springs.
If armature speed was less than 6950 rpm and ammeter indication was less
than 30 amperes, check for bad connection between brushes and field coil
or a dirty commutator.
If armature speed was 6950 rpm or more and ammeter indication was more
than 30 amperes replace field coil and housing as an assembly.