Hudson Terraplane K 1934 Mechanical Procedure Manual page 66

SECTION 6
Page 4
graduations to read 1/5th volt and amperage graduations to
read M ampere is absolutely essential to make electrical tests.
The leads to the ammeter should be of at least No. 12 stranded
wire and as short as possible. A variable rheostat for inserting
a resistance in a circuit is also very useful. Connections to the
test meters must be clean and tight if accurate readings are to
be had (Figure 603).
To test the generator on cars having a circuit breaker only
(Figure 605), connect the ammeter in series between the gener-
ator terminal and the wire removed from that terminal; connect
the voltmeter across the generator terminal and a clean, un-
painted ground on the engine or frame. Cars which are
equipped with a regulator, either two-charge (Figure 606) or
vibrating voltage type (Figure 607) should
Figure 603—Volt Ammeter—J-795
have the field terminal post grounded to the generator frame
while generator charging rate tests are being made (Figure 604).
After the meters are connected, start the engine and set the
throttle so that the engine will run at a speed equal to 25 or 30
M.P.H. in high gear. Run for several minutes or until no further
rise in the voltage is noted. Then by varying the speed of the
engine, generator performance can be checked against the
specifications for the particular unit under test and any adjust-
ments needed made.
In checking generator output the voltage reading must be
noted as the amperage output varies with the voltage.
MECHANICAL PROCEDURE MANUAL
Complete Inspection
When a complete inspection of the generator is to be
made, the unit should be removed from the car and the work
done on the bench. Dismantle, thoroughly clean and inspect
all parts, replacing any that show excessive wear. At this
time the commutator will probably need turning and under-
cutting. When undercutting be sure to undercut the mica
square, the full width of the slot and A of an inch deep.
The commutator end bearing should be checked for wear
according to the specifications for the generator being
worked on. The drive end bearing, after thorough cleaning,
should be packed not over one- half full with a heat resisting
grease before being assembled in the drive end head.
When new brushes are installed, they should be carefully
sanded in so as to have at least a 75% bearing on the
commutator and then run in long enough to have a perfect fit
before any attempt is made to set the generator output.
Figure 604—Checking Charging Rate
Figure 605—Charging Circuit (without Regulator)