Jeep UNIVERSAL CJ-2A - Page 140

'Jeep' U NIVERSAL and ' Jeep ' DISPATCHE R
I
b. Voltage do es not build up-regulator ou t of a d-
j us tment, field circuit open, grounded s er ies circuit.
See test 8.
1- 40. T est Se ven
Re mov e the r egulato r cover and with the gener a to r
oper a ting at a medium speed hold the circ uit
breaker contacts closed.
a. Ammeter shows no charge--open circuit breaker
sh un t winding, in c orrec t setting of circuit breaker ,
or dirty contacts. C lean contacts and r eset ci rcuit
breaker as in P ar. I-27a. If the circuit breaker can-
not be se t, th e shun t coil is open and the reg ula to r
sh ou ld be removed f or overhau l.
b. No generat or outpu t- clean th e circuit breaker
contacts and try the test again . If there is still no
charge th e series windin gs ar e open and the regu -
la tor should be removed for overhau l.
1-41 . T est Ei ght
Run the generator at idle speed and momentari ly
connect a jump er from the F-terrninal to the regu-
lator base.
a. Voltage builds up --open field ci rcui t or r egula -
to r out of adjustment. See test 9.
b. Voltag e does not build u p-g rounded series cir-
cuit. R emove regulator for overhaul.
1- 42. T es t Nin e
Operate at a medium sp eed with t he ju mper re-
moved. Rem o ve th e regulator cover and hold the
voltag e regulator contacts cl os ed.
a. Voltage builds up - voltage r eg ul ato r contacts
burned or dirt y or in correct regulator set t in g.
Clean the contacts and adjust the regulator as in
Par. I-27.
b. Volt age does not build up - cle an con tac ts and
repeat test . If th e voltage still does not build up ,
see
test 10.
1- 43. T es t Ten
Remove the regulat or c over and hold the c urr ent
regulator contacts closed.
a . Voltag e builds up- c urr ent re gu lat or contacts
burned or dir ty or in cor rect re gul ator setting.
Clean the contacts and adjust the regulator as in
Par. I-27.
b. Volt age does not build up - clean the contacts
and repeat th e test . If the voltage still does not
build up remove the regulator for an overhaul.
1-44. STARTING MOTO R
Th e starting motor is similar in construction to
th e generator, bu t the d esign of the parts is
different due to it being necessary for the starting
motor to handl e a large amou nt of current for
short intervals. Both motor and generator requir e
a
frame, field coils, armatur e and brushes .
Fig. 157 illustrates a typical s ta rting motor, the in -
ternal construction of which is represen tat iv e of all
the motors u sed on the models discussed here.
T here are some differences in starting switch con-
t rol and flywheel drive mechanism which are
covered separate ly . Also, the 12-volt st arting
motor has no band cover, i tem 3.
Eff ective with Model CJ-3A veh i cl e Serial No.
30973, a 4Yz" [11 ,43 ern.} star ting motor was
adopted. Thi s change incorporat ed a new star t in g
swi
tch and flywheel drive whi ch are described
separately below. This starte r is equipped with
seal ed type absorben t bronz e bearings and no
lu brication is required. Th e service procedures ou t-
lined below will appl y to the s tart in g motors of all
the models covered here.
1- 45. Mai nte n ance Procedure
A per i odic inspect i on should be made of th e star t-
ing cir c ui t. Whi le the interval between these checks
will vary accordin g to the type of service, it shoul d,
under normal cond itions, be m ade every 500 hour s
of operation. At th is c heck the foll owin g points
shoul d be inspected.
FI G. !5 6- STAR TING CIRCUIT
1-46. Wiri ng
!- Batt ery
2- Stnrtcr Mo tor
3- St Arter Swit ch
105 40
Inspe ct the starting c ir cu it to ma ke su re tha t a ll
connections ar e clean and tight. Ch eck for wo rn
or damaged ins u lation on the wires. P erfo rm a
voltage -loss l est to make sure the re is no loss of
starting motor efficiency r esulting from high re -
sis tance connections. Volt age loss from the battery
terminal to the starting motor termin al should
not exce ed .30 volts for each 100 amperes . Voltage
loss between th e battery ground post and the
star ting motor frame shoul d no t exceed .1 0 volts
for each 100 amperes. If the voltage loss is greater
th an these limi ts , measure the vo lta ge loss over
each part of the circuit un til the resistance causing
the voltage loss is located and cor r ected.
1-47. Commu ta tor
Sluggish starting motor o peration may be caused
by a dirty commutator or worn brushes. If th e
commutator is dirty or discolored, it can be cleaned
on 6-volt s ta rting motors with 00 sandpaper. Blow
the sand out of the motor after cleaning. The
commutator on 12-volt starting motors cannot be
cleaned while th e starting mo tor is mo u nted on the
engine and it will be necessary to remove it and
proceed as for an overhaul. Should the commu t ator
in any starting motor be rough or worn, it should
be removed for cleaning and reconditioning.
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