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1
DIode holder posItIve sIde
Connect
the posItIve lead of the CirCUIt
tester to
the diode
holder and the negatIve lead
to
the diode pin and check the
resIstance
A
good
dIode WIll indIcate
no
resistance
Next
turn
the
polarity
of the
tester
and check agaIn
If the
tester
needle
moves
In
eIther directIon
the diode
IS
short
CirCUIted
If any of the dIodes
IS
defectIve
It
might
be advIsable
to
renew
the
whole
assembly
The testing
connections
are
shown
In
FIg
M 15
2 DIode holder negatIve SIde
Check the negative SIde
as
described above but the
CIrCU
It tester
must
be reversed
FIg
M 16
Broshes
Check that the remaining brush
length
IS
7 5
mm
0 295
In
FIg
M 17
and
check the brush spring pressure
by
pressmg
brush
down
to
WIthIn
1
mm
004
10
of the holder
The
pressure should be 035
kg
077 Ib
In
thIS condition but
a
mlntmum
of 0 2
kg
044 Ib
IS
permissible
ALTERNATOR
Assembly
and Installation
Install the
stator
COIl
N
termmal
to
the brush holder and fit
the
term
mal msulator
Install the
bearing
Into
the drive end bracket and fIt the
bearing
retamer
WIth
the three
screws
Pack
the
rear
bearing
With
multI purpose grease
If
no
sealed
beanng
IS
used
Then press
the drive end bracket
on
to
the
rotor
shaft dnve end
bearing
The remammg
operatIons
are
carried
out
10 reverse
order
to
the
dIsmantling procedure
Make
sure
that the dIodes
are
connected
correctly
Fig
M 18 and M 19
The mstallatlon of the alternator
IS a
reversal of the removal
procedure
Observe
all
pomts
gIven
under
the
head 109
ALTERNATOR
PrecautIonary ServIcIng
Notes
ALTERNATOR
Inspection
of
output
Connect the alternator
10
a
test
ClrCU
It
as
shown
In
FIg
M 20
and dnve
by
means
of
a
SUItable
motor
With the alternator
at
rest
there Will be
a
negatIve
current to
the field cool
2 amps
When the alternator
IS
turnmg
at
about 1000 rpm
there should
be
no
negative
current
WIth the
SWItch closed and the load
resIstance at
maxImum
slowly
reduce the
load
reSIstance
mcreaslng the alternato
speed
Read off the
current
value
In
relation
to
the alternator
speed
and check
10
accordance
to
the
speCIfIcatIons
If the
deVIation
IS
small the alternator
IS 10
good
condItion
ALTERNATOR
Flndmg
of faults
Alternator does not
charge
the
battery
1
Check
drlvmg
belt
tensIon
2
Field cable broken
at
control
Untt
3
NegatIve
cable broken
at
control
unIt
4
POSItive and field cables crossed
Alternator
output
uncontrolled
1
POSitive cable broken
at
control
Untt
2
Field and
negatIve
cables crossed
at
control
unot
3
Field and
output
connectors
touching
at alternator
Low
unsteady charge
1
Check
drlvlng
belt
tension
2
Check for
high
resistance
at
battery termInals
and
10
CirCUit connectIons
particularly
earth connectIons
VOLTAGE REGULATOR
Removal
Disconnect
the
6 way
connector
and
remove
the
screws
secUring the
regulator
to
the bulkhead
VOLTAGE REGULATOR
Testing
ElectrIcal test
Connect the
CirCUIt
as
shown
In
FIg
M 22 uSIng
a
fully charged
battery
and
run
the alternator
at
5000 rpm The
voltage
read 109
should be 140
15 0 volts
If the
voltage
IS
not correct
adjUst
the regu lator
Mechantcal
adJustments
The gap values of the
constant
voltage relay
and the
pIlot lamp
relay
must
be
as
follows
Constant
vo
Itage relay
FIg
M 23
Gl
09
10mm
0 035
0 039
10
G2
0 8
1 2
mm
0032
004710
G3
0 4
0 5
mm
0016
0020
In
PIlot
light
relay
G 1
0 2
mm
0 008
10
G2
08
1 2
mm
0 2
0 024
In
G3
0 4
0 5
mm
0016
02010
Back gap
G
1
Clean all
contacts
With flOe emery cloth pnor
adjustment
Usmg
feeler gauges
check the back gap
Gl
and
adjUst
If
necessary
by
means
of the
armatu
re
set
screw
Air gap
G2
Check the
aIr
gap between the
armature
and the top of the COli
WIth
a
feeler gauge and If necessary
adjust
by
bending
the
primary
contact
support Fig
M 25
usmg the
adJustmg
tool
Pomt gap
G3
Check the gap WIth
feeler gauges and
adjust
If necessary
by
bend 109 the
secondary
contact
support
With the
adJustong
tool
Yoke gap
gl
Use feeler gauges and
measure
the gap between the
armature
and the
yoke
and If necessary
adJUst
be
bending
the
armature
setscrew
Air gap
g2
Check the gap With feeler gauges and
adJUst
by
loosen Ing the
contact set
screw
and raisIng
or
lowering
the contact
set
WIth
a
screwdnver
FIg
M 26
Pomt gap
g3
h
he gap
y
means
of
a
feeler gauge and
adjust
by
loosening
the
contact
po
lOt set
screw
and
alsmg
or
lowerulg
the
contact
set
WIth
a
screwdriver
89
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