TM 5-4940-200-35
Section VI. GENERATOR-WELDER
41.
General
(2) Refer to TM 5-4940-200-12 and lift the
The generator-welder is a multi-purpose machine
brushes from the sliprings and from the
capable of generating direct current for welding, battery
exciter commutator.
charging, or furnishing power to start equipment with low
(3) Refer to TM 5-4940-200-12 and remove
or defective batteries. It will generate 120-volt, single-
the capacitor from the positive brush
phase, or 200-volt, 3-phase current and has an
group.
integrated 220-volt, 3-phase electric motor which can be
(4) Using a multimeter, test between leads. A
used to drive the direct current generator portion when
reading of more than 63 ohms or less than
an outside electrical power source is available. The
57 ohms indicates a faulty field coil or
truck engine is the basic source of power for operation of
interconnections; the stator assembly
the machine. Power from the truck engine is delivered
must be removed for additional testing.
through flange and brakedrum, universal joint and shaft
(5) Test between the field and one of the
assembly, power takeoff pulleys, and belts to the
exciter leads marked EXF or EX + as
armature shaft.
described in TM 5-764. A reading of less
than 0.5 megohm indicates faulty
insulation; the stator assembly must be
42.
On-Equipment Testing
removed for additional testing.
a. Exciter Armature.
Refer to TM 5-764 for
armature testing procedures.
f. Shunt Field. Refer to TM 5-764 for shunt field
testing procedures. A reading of less than 0.5 megohm
b. Revolving Field.
indicates faulty insulation; the field frame must be
removed for additional testing.
(1) Refer to TM 5-4940-200-12 and lift the
brushes from the electrical contact rings.
g. Welding Generator Series Field Group. Refer to
(2) Using a multimeter, test between the two
TM 5-764 for series field group testing
electrical contact rings. A reading of more
than 19.95 ohms or less than 18.05 ohms
h. Welding Generator Interpole Group. Refer to
indicates defective wiring or electrical
TM 5-764 for interpole group testing procedures.
contact rings; the armature must be
removed for further testing.
43.
Generator-Welder
(3) Refer to TM 5-764 for procedures to be
used in testing between the armature
shaft and the electrical contact rings.
the generator-welder.
c. Generator-welder Armature. Refer to TM 5-764
b. Testing During or After Disassembly. Refer to
for armature testing procedures.
TM 5-764 and test each component of the generator-
welder at the appropriate time during disassembly.
d. Motor Stator. Refer to TM 5-764 for motor stator
testing procedures.
c. Disassembly.
e. Exciter Field Group.
(1) Refer to TM 5-4940-200-12 and remove
the air filters, and wrappers, rear shaft
(1) Disconnect the exciter leads marked EXF
guard, and end cover.
and EX + at the terminal board on the
(2) Refer to figure 24 and disassemble the
generator-welder.
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