Test Equipment - Generac Power Systems GTV99O Service Manual

SECIION 6: ELECTRIC STARTER
SEcrION CONTENTS
PAGE
GENERA1tNFORMAT|ON.....................................-....--....6'1
TROUBLESHOOTTNG...........--.......................-.................6'1
TEST EQU1PMENT
..................--....-................................. 6-2
TEST STARTER
MOTOR .....-............................................ 6'2
Tening Starter So|enoid..............................................
6-2
BATTERY 1NFORMAT|ON
........ ........................''............. 6-2
lnnallarion .............................................................-..6-3
CheckingBattery......................................................6'3
T e s r i - q 8 a m e r y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 - a
Battery Recommendations ...--.......................-........
6_4
Battery Cable Recommendalions................................
6-4
GENER,AL INFORMATION
The starter motor uses a geartype engagement method, em-
ilarto an automobile starter When the starter motor is adLvated,
the pinlon gear engages a ring gear attached to the engtne
fly\,vheeland cranks the engine.
ENG NE CRANKS SLOWLY
a. AdditonaLload affecting pedormance (see note above).
b. Discharged battery
c. Faulty electrical connecrion (battery circuit)
d. Discharged battery (see alternators).
e. Didy or worn starter motor commutator, bearing, weak
ma9ners, erc.
f. Worn brushes orweak brush sping.
g.Wrong oil viscosity for temperature expeded.
h. Battery leads too long orWre too small.
i. Batterytoo small.
ENG NEWILL
NOI CRANK:
a. Fau iy sdfety lnte.locks.
b. Discharged or defedive battery
c. Faulty electical connections.
d. Faulty narter motor switch (open cltcuit)
e. Open clrcuit in stader motor.
f. Brushes sticking, etc.
g. Faulty solenoid.
STARTER
N4OTOR
SPINS 8UT DOES NOICRANK ENGINE:
a. Sticking pinion gear due io di.t.
b.Damaged pinion or ing gear
c. Battery fau ry or damaged.
d.Incorrect rotation due to reveBed motor polariv-a lmolors
rotate countercockwlse
viewed {rom pinion gear
e. Damaged solenoid
sTARTER IVIOTOR
SPINS BUTWLL NOT STOP:
a. Defective starter switch.
b. solenoid stuck engaged.
TEST EQUIPMENT
The folowing is a list of equipment recommended to ten and
repa r starter motors.
DIG IAt [.,1ULTMETER:
A digital multimeter (VOM) may be used to readvolts, ohms,
amperes and test diodes (rectifiels), Frgure 6 2.
NOTE: The Digital MultineEr is equipped with two fuses
to prcvent damage to the '',et€r in the event that the input
fimits arc exceeded. ll the mett.r displays a rcading of 0.00
when testing DC output check tuses in meter Refer to
voM opefttoB manual for prccedurc for .he.king fuses.
6-1
figute 6-1. Stader Motor
TROUBTESHOOTING
NOTE: lf a stading problem it encountercd, the engine
itseff should be thoroughly checked to eliminate it as the
cause of starting difficulty, It is a good practice to check
the engine for fteedom of rctation by rehoving the
tpa* plugs and tuning the qankshaft over slowly by
hand, to be surc it rctabs freely.
WARNING: DO NOT ROTATE ENGINE wlTH ELECIRIC
STARTERWITH
SPARK PTUGS REMOVED.ARCING
AT
THE SPARK PLUG ENDS MAY IGNITE THE GASOLINE
VAPOR EXITING THE SPARK PLUG HO[E.