TM 5-3825-213-35
voltage by the field current.
The
(e) Reduce the alternating current gener-
resultant value, which is the minimum
ator speed to 1,000 rpm and remove
resistance of the carbon pile, should
all load, including battery load, by
not exceed 0.50 ohms.
opening the load switch and load relay
Increase the generator speed to 6,000
switch. Check the voltage range by
(b)
rpm and check the voltage drop when
first turning the adjusting knob of the
a load of 100 amperes is applied. If
5-ohm adjustable resistor assembly
the drop is less than 0.5 volt, remove
completely counterclockwise, and then
the load, reduce the alternator speed
turning it completely clockwise.
to 2,000 rpm, and turn the contact
Voltage range should be 25.5 to 30
screw assembly (22) counterclockwise.
volts. If the range is incorrect, adjust
Check at 6,000 rpm and 100 ampere
by loosening the screw (32) and
load for a 0.5 volt drop. Repeat until
turning the coil core (35).
If the
the correct voltage drop is obtained.
voltage is too high, turn the coil core
Reduce the generator speed to 4,000
clockwise. If the voltage is too low,
(c)
turn the coil core counterclockwise.
rpm and shock load with 100 amperes
Set the voltage at 28 volts by means
to settle the carbon pile. Adjust the
of the 5-ohm adjustable resistor
regulator to 28 volts by means of the
assembly. Tighten the screw.
5-ohm adjustable resistor assembly.
(f) Install the tube support cover, pipe
Repeat (b) and (c) above at least three
(d)
times to assure repetition of perfor-
c. Installation. Install the generator voltage regulator
mance.
(TM 5-3825-213-20).
Section III. PLOW AND CARRIER ENGINE STARTER ASSEMBLIES
b. Disassembly. Disassemble the plow and carrier
189. General
engine starter in numerical sequence as illustrated on
The starter motor converts the electrical energy from
the battery into mechanical power and transmits this
power to the engine for the purpose of starting. Field
windings, consisting of coils of copper wires, produce a
191. Plow and Carrier Engine Starter Assemblies
magnetic field which rotates the armature.
Copper
Cleaning, Inspection, and Repair
conductors are installed lengthwise in slots around the
a. Cleaning.
armature core, and are connected to a commutator
(1) Clean the armature with compressed air to
consisting of a number of copper segments insulated from
remove all dust and dirt.
Wipe the
each other and from the armature shaft. The armature is
armature with a clean cloth dampened with
mounted in bearings at each end of the motor. The
an approved cleaning solvent. Clean the
brushes in the commutator make electrical contact with
commutator lightly with No. 00 sandpaper.
the revolving commutator to complete the electrical
(2) Clean all other parts with an approved
circuit.
cleaning solvent and dry thoroughly with
compressed air.
190. Plow and Carrier Engine Starter Assemblies
b. Inspection and Repair.
(1) Inspect armature windings to be sure all are
Removal and Disassembly
pressed into the core slots and are stacked
a. Removal. Remove the plow and carrier engine
starters (TM 5-3825-213-20).
130
