reading for 10 ampere reading ( c )
( a l t e r n a t o r ) regulator, if not, re-
above, should be 27.8 - 28.6 volts and
p e a t all voltage adjustments and
the voltage reading for the 100 - 50
f i x e d load, (d) a b o v e , s h o u l d b e
(i) S t o p t h e v a r i d r i v e a s s e m b l y ,
27.3 - 28.7 volts.
f (6) (a) above, a n d r e m o v e a l l
(h) If performance results, (a) t h r o u g h
(g) above, areas indicated in these
regulator from the test stand.
Note. The key numbers
in parentheses refer
to figure 47, except
where otherwise indicated.
TESTING STARTERS (CRANKING MOTORS)
e r a t u r e , technical manuals listed in
a. To determine the general operating condi-
v o l t a g e at which this test is to be
tion of starters (cranking motors) two types of
t e s t s are normally performed which are: the
no load (free-running) test and the stall torque
(5) The direction of rotation of the starter
(measuring stall current and torque) test.
(cranking motor) must be determined
before tests are started. The direction
b. Precautionary procedures to follow in pre-
is normally indicated on the nameplate
p a r i n g the test stand before testing starters
of the starter, or in the manufacturer's
(cranking motors) are listed below.
l i t e r a t u r e and table 9, and must be
(1) The starter (cranking motor) must
c o n s i d e r e d for attaching the torque
be mounted properly by using the cor-
rect type mounting. There are several
a r m and bracket assembly (fig. 25)
manufacturer's with various types and
p r o p e r l y , also, t h e r o t a t i o n o f t h e
m o d e l s of starters, therefore, a par-
starter will determine the location of
ticular type mounting is required for
the scale and scale support (fig. 61).
If there is any question on the direc-
through 27 depict these mountings and
o t h e r mounting requirements. Refer
tion of rotation of the starter, it can be
to these illustrations to select the ap-
resolved by watching the pinion gear
propriate type mounting when mount-
of the starter when performing the no
ing the starter on the test stand.
( 2 ) The voltage, amperage, and battery
voltage must be properly adjusted for
c. For any of the mountings for the starters,
t h e unit undergoing test. These ad-
adjustments can be made to the scale support
justments are made with the dc volt-
to permit a vertical pull on the scale (figs. 22
meter range selector switch (9), load
through 25) and, therefore, obtain an accurate
dc ammeter range selector switch (7),
reading on the scale. The two threaded holes
a n d battery circuit selector switch
vided as a means of exerting a direct pull on
the torque arm when the gear engagement by
torque arm and bracket assembly (fig.
t h e adjustable jaws of the torque arm is not
2 5 ) must be securely attached, also,
d i r e c t l y under the center of the starter shaft.
t h e scale support (fig. 61) must be
The location of the eyebolt in the torque arm
bolted down securely.
is changed to either of these threaded holes to
(4) The stall torque test must be short in
allow a direct pull on the torque arm.
d u r a t i o n and never performed at the
rated voltage of the starter (cranking
d. The no load (free running) test is per-
m o t o r ) . Refer to manufacturer's lit-
formed by mounting the starter (cranking mo-