CHAPTER
1
INTRODUCTION
Section I.
GENERAL
1-1. Scope
1-3. Reporting of Errors
The following instructions are provided for the use
Report of errors, omissions, and recommendations
of direct and general support and depot main-
for improving this publication by the individual
tenance personnel. They contain information on the
user is encouraged. Reports should be submitted on
maintenance of the equipment which is beyond the
DA Form 2028 (Recommended Changes to
scope of the tools, equipment, personnel or supplies
Publications) and forwarded direct to the Com-
normally available to organizational maintenance
manding General, U. S. Army Mobility Equipment
facilities.
Command,
ATTN:
AMSME-MPP,
4300
Goodfellow Boulevard, St. Louis, Mo. 63120.
1-2. Forms and Records
DA Forms and records for equipment maintenance
will be only those prescribed in TM 38-750.
Section Il. DESCRIPTION AND DATA
1-4. Description
b. Dynamotor-Welder Repair and Overhaul
Data.
A complete description of the shop set and com-
(1) DC (direct current) welder armature
ponents is given in TM 5-4940-225-12.
winding.
1-5. Difference in Models
Number of coils . . . . . . . . . . . ..33
The difference in models is given in TM 5-4940-
Number of slots . . . . . . . . . . . 33
225-12.
Number of turns per
coil . . . . . . . . . . . . . . . . . . .1
1-6. Tabulated Data
Coil pitch . . . . . . . . . . . . . . . . . . . 1 to 9
a. Dynamotor- Welder.
Commutator pitch . . . . . . . . . .1 to 50
Number of commutator
Manufacturer . . . . . . . . . . Hobart Brothers Co.
bars. . . . . . . . . . . . . . . . . . . . . . . . 99
Model . . . . . . . . . . . . . . . . . . . .SMR-300
Wire size . . . . . . . . . . . . . . . . . . . 3/32 in. (inch) X 3/8 in.
(1) DC generator.
Wire type . . . . . . . . . . . . . . . . . . . . . . Copper, Type T, heavy
Volts . . . . . . . . . . . . . . . . . . . .40
synthetic resin-coated per
Kilowatts . . . . . . . . . . . . . . . . . .12
Military Specification
Amperes . . . . . . . . . . . . . . . . 300
MIL-W-583A
Winding type . . . . . . . . . . . . . . . . Wave
Rpm (revolutions per
minute) . . . . . . . . . . . . . . . . 1500/1800
(2) Motor-alternator revolving field winding.
Duty cycle . . . . . . . . . . . . . . . . 60percent
Number of coils . . . . . . . . . . . . 4
(2) AC generator.
Turns per coil . . . . . . . . . . . . . .520
Voltage . . . . . . . . . . . . . . . . . . . . 220
Turns parlayer. . . . . . . . . . .36
Amperes . . . . . . . . . . . . . . . . . . . . 56
Wire size . . . . . . . . . . . . . . . . . . . No. 1.5 AWG (American
Wire Gage)
Kilowatts . . . . . . . . . . . . . . . . .12
Power factor . . . . . . . . . . . . . . . .0.8
Type
of
wire
Copper.
Type
T.
heavy
Phase. . . . . . . . . . . . . . . . . . . .3
synthetic resin-coated per
Cycle . . . . . . . . . . . . . . .50/60
Military Specification
Rpm . . . . . . . . . . . . . . . . . . . . . . .1500/ 1800
MIL-W-783A
Duty cycle . . . . . . . . . . . . . . . . . 100 percent
(3) DC exciter armature winding.
(3) M o t o r
Number of coils . . . . . . . . . . .43
Voltage . . . . . . . . . . . . . . . . . . . . . 240
Number of slots . . . . . . . . . . . . .43
Turns percoil. . . . . . . . . . . . .6
Amperes . . . . . . . . . . 56
Coil pitch . . . . . . . . . . . . . . . . 1 to 11
Phase . . . . . . . . . . . . . . . . . . . .3
Commutator pitch . . . . 1 10 43
Cycle .. . . . . . . . . . . . . . . . . . . .50/60
Number of commutator
Rpm . . . . . . . . . . . . . . . . . . . . .1500/ 1800
Horsepower . . . . . . . . . . . . . . . .25
bars . . . . . . . . . . . . . . . . . . . . .85
1-1
