No. 00 sandpaper. Clean all dust particles off
on field body and other on field coil leads. If test lamp
commutator using compressed air.
lights, field coils are grounded. Replace starter if coil is
(5) Check for short circuits in armature by
grounded.
rotating armature on a growler with a steel strip, such as
(9) Check field coils for open circuits by checking
a hacksaw, blade held firmly on armature. The hacksaw
with a test lamp. Connect probes of test lamp to the two
blade will vibrate on the area of the short circuit. If short
leads from the coils. If lamp does not light, coil is open.
circuits are found, repeat above paragraph (4). If short
Replace starter if field coil is open.
circuit cannot be corrected, replace starter.
(10) Check brush holders for defects and
(6) Check for open circuits by inspecting for
replace them if defective.
loose connections at points where conductors are
( 11)Inspect drive assembly for cracks, breaks,
connected to the commutator risers. Continuity must
clutching action, or other damage. Replace drive
exist between adjacent commutator bars. Resolder if
assembly if required.
applicable. If open circuit cannot be cleared, replace
(12) Inspect bearings for defects. Replace
starter.
defective bearings.
(7) Check armature for grounds using a test
d. Reassembly.
lamp. Place one probe of test lamp on armature core
(1) Refer to figure 3-8 and reassemble starter.
and the other on each commutator bar in turn. If test
(2) Perform the no-load and resistance tests
lamp lights, armature is grounded. If ground cannot be
(TM 10-3950-203-20).
repaired, replace starter.
e. Installation. Install starter (TM 10-3950-203-
(8) Check field coils for grounds by checking
20).
coils with a test lamp. Place one probe of test lamp
Section IV. Cooling System
3-9. General
(2) Submerge radiator in a tank of water.
Open compressed air line to radiator and apply a
This section consists of testing and repairing the
pressure of 8-to 10-psi, then shut-off air supply.
radiator.
(3) Observe water tank for bubbles escaping
from radiator. If no bubbles appear, radiator does
not leak. In the event bubbles appear, mark origin
3-10. Radiator
of bubbles and repair leak by soldering.
c. Installation. Install radiator (TM 10-3950-
a. Removal. Remove radiator (TM 10-3950-
203-20).
203-20).
b. Testing and Repairing.
(1) Place cap tightly on radiator and close
drain cock. Block off upper hose connection.
Connect a line to lower hose connection with an air
pressure gage in line.
Section V. Fuel System
b. Disassembly. Refer to figure 3-9 and
3-11. Carburetor
disassemble carburetor:
a. Removal .Remove carburetor (TM 10-3950-
3-15
