voltage. The setting of the 6, 12, and 24 volt
tor) on the test stand using the appropriate
input voltage is accomplished with the battery
mounting b(1) above, and connecting it to the
circuit selector switch (23, fig. 47).
g. For stall torque tests within 200 ampere
record of the voltage, current (amperes), and
capacity, one cable harness 38405 (fig. 61) is
connected between the starter input binding
post (fig. 61) and the starter (cranking motor)
Caution: In most cases, the no load (free
(+) terminal stud (fig. 61).
running) test is performed with the starter
(cranking motor) run at the normal rated
h. For stall torque tests above 200 amperes
voltage of the starter (cranking motor). How-
capacity, two cable harness 38405 (fig. 61) are
ever, some of the more powerful starters
connected in parallel between the starter input
(cranking motors) will attain such excessive
binding post (fig. 61) and the starter (crank-
speeds when running under a no load condi-
ing motor) (+) terminal stud (fig. 61).
tion, that the manufacturer specifies a reduced
i. Torque, in foot-pounds, is read directly on
voltage for the no load (free running) test.
Refer to manufacturer's literature, technical
23, 24, and 25), however, when the starter
several manufacturers and models of starters
used the scale reading is multiplied by 10 to
(cranking motors) for this information before
obtain the correct torque in pound feet.
conducting the no load (free running) test.
j. The chain vise and
bracket assembly (figs.
e. The stall torque (measuring stall current
22, 23, and 25) holding the starter (cranking
and torque) test is performed after the no load
(free running) test, d above, has been com-
bracket (fig. 21) can be rotated 90 degrees, and
pleted. The stall torque test is performed sim-
can be moved horizontally a distance of 6
ilarly to the no load (free running) test, except
inches. Loosen the hexagon plain nut (3-E,
a scale for recording foot-pounds (torque) is
adjust as required.
connected to the pinion gear of the starter
Note. When performing the stall torque test
(cranking motor), by means of a torque arm
n e c e s s a r y to provide a means of shifting the starter
(cranking motor) pinion gear for maintaining gear
bracket assembly (fig. 25). Detail procedures
accessibility for engagement of the jaws of the torque
which may be used for this procedure.
Caution: Stall torque tests are seldom, if
Caution: Do not depend on the jaws of the
ever, performed at the nominal rated voltage
torque arm to maintain the pinion gear in the
of the starter (cranking motor). Most gen-
shifted position. Always use one of the methods
erally the applied voltage is reduced (specified
as testing voltage, table 9) considerably below
gear in proper position.
the nominal rated voltage for performance of
this type of test. Refer to manufacturer's
a. Using the Test Stand for Power Source
or table 9 which covers several manufacturers
for no Load (free running) test.
and models of starters (cranking motors) for
(1) Purpose. This test is performed to
the proper amount of voltage to be applied
indicate the functioning of the starter
during these test procedures.
(cranking motor) when there is no
f. When performing the stall torque test,
load connected to the starter (crank-
requirements may necessitate applying the bat-
i n g motor) permitting it to run
tery voltage rating next higher than the speci-
freely. The starter (cranking motor)
fied testing voltage: for example: 4.8 testing
will revolve at a specified rpm when
voltage requires a 6 volt input voltage, 9.6 test-
a given testing voltage is applied to
ing voltage requires a 12 volt input voltage,
t h e input (+) terminal (stud (fig.
and 19.2 testing voltage requires a 24 volt input
60)) of the starter (cranking motor).