TM 9-3431-254-14&P
TROUBLESHOOTING
The following chart contains information which can be used to diagnose and correct unsatisfactory operation or failure
of the various components of the machine. Each symptom of trouble is followed by a list of probable causes and pro-
cedure to correct them.
REMEDY
TROUBLE
POSSIBLE CAUSE
ENGINE
Engine Instruction
see
Book and Parts List
Engine will not start
a. See Engine Manual.
a Engine ignition problem
b. Overspeed relay control board
b. Refer to Control Box Malfunction, page
18, for detailed troubleshooting instruc-
malfunction
tions.
Engine starts but won't con-
a. Faulty ignition switch
a.
Replace ignition switch
tinue in operation
b. Timer Board malfunction
b. Same as b. above.
Readjust engine no load operating speed.
c. Overspeed relay control may be
c.
causing engine to stop, due to
increase in engine speed after
break-in.
a.
Check connections completely.
No output
a.
Loose connection
Open circuit in revolving field
a. Replace coil(s).
Generates less than 10
a.
volts
coils
b. Engine speed too slow
b. increase engine speed to 1800-1840
RPM - no load.
c. Brush and slip rinq dirty
c. Check brushes and clean slip rings.
d. Replace or repair.
d. Defective rheostat
Adjust to detent position.
Range Switch positioned
e.
e.
between setting
f.
Repair or replace.
f.
Range Switch defective
Defective wiring
Check and repair.
9.
9.
h. Check and replace defective diode.
Replace fuse. See LOSS OF MAG-
i.
i.
Lose of residual magnetism
NETISM.
a. Check connections and replace meter
if necessary.
b. Check connections or replace meter.
c.
c. Replace fuse. See LOSS OF MAG-
NETISM.
(loss of magnetism)