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1 0 5-1 06
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(14),
rectifier
then remove rectifier from
housing. Remove retaining bolts and
withdraw housing and stator from end
frame.
Remove pulley and fan from rotor
shaft, then press rotor assembly
of
front bearing and end frame. Remove
snap ring and retainer plat.e
(5)
and felt seal and retainer assembly
Th
(4
)
from end frame.
remove rear
l
Fig. 107-Erploded view of ryplcal
I Pulley
5 Beannr
2 Fan
6 Reta1ner pltl4r
3 Dr1ve end
frame
t
4
Fe
eeal & reta1ner
7 Rotor
a uy
8
Fig. 108-Erploded view of Perkins allerneror used on some
6
Beanna
1. Pulley
6 Retainer plato
2. Fan
S. Spacer
7 Rotor
8. Bearing
4 End f'rame
44
(8),
ing
first be unsoldered and rings pried from
shaft. Use a suitable puller to remove
bearing.
Inspect brushes and rotor slip rings for
(7)
out
wear and renew if necessary. Brush
length when new is
(6),
bearing
Renew brushes
(0.394
mm
bear-
should be
lucas
a/lernalor used on some
9. Shp nnp
&
10 Stator
enap nna
II Shp r1ng
12. Bruahes & spnngs
Beanng
13 Bnll l h holder
9 Stator
10. D i od e terminal
11 D•ode
12 Bruah holder aasy
slip ring (9) connections must
if
20
(0.787
mm
length is less than
inch). Brush spnng tenston
1.3-2.7
(4.7-9.8
N
ounces). Con-
MF240
MF2SO
and
,,.crors.
14 Rect1fler
15. Sur11• prol«llon
d1ode
houa1ng
16 ReifUiator
17 End C'OVtr
Torm�nal
MF240
and
MF2SO
rracrors.
13. Ref1ulotor
14. Reor houa1na
rect1fler
15.
MASSEY -FERGUSON
nect ohmmeter leads between the two
rotor slip rings to check field winding
resistance. Ohmmeter should register
3.2
ohms. Check for continuity between
slip rings and rotor frame. If continuity
mdtcated, field winding is grounded
IS
inch).
and rotor should be renewed.
10
Test stator windings for grounded or
open circnits as f ollows: Connect ohm
meter leads between stator frame and
each lead wire. A low readmg would m
dicate a grounded circuit. Connect tester
leads successively between each pair of
stator leads. A high reading would in
dicate an open circuit.
Reassemble alternator by reversing
the disassembly procedure. Be sure to
align match marks on housings made
prio1· to disassembly.
Models MF240-MF250 With Perkins
Alternator
105.
TESTING.
output, connect a voltmeter between
"0+" termihal of alternator and
ground. Start the engme and observe
voltmeter reading. V oltage should be
within range of
voltmeter readmg exceeds
voltage regulator is faulty. If voltmeter
reading is less than
into small hole near the center of alter
nator rear housing to ground the "F"
terminal. if voltage is now within range
13
15
of
to
volts. regulator is faulty
voltage remains less than
disassemble alternator and check field
winding, diodes and stator as outlined
m
106.
paragraph
106.
OVERHAUL. Prior to di s assem
bly, scribe matching marks across end
108)
f r ame (4-Fig.
to
ensure
correct
reassembly. Remove four through-bolts,
then separate end frame with rotor from
rear housing and stator. Hold rotor in a
vise, then remove pulley nut, pulley
(2)
fan
and spacer
Separate rotor from end frame. Remove
(5)
front bearing
(8)
rear bearmg
from rotor if necessary.
Drill
Remove five nuts attaching brush
holder/diode/stator assembly to rear
housing. Unsolder stator wires from
diodes.
out rivet between brush box
(12)
and dtode rectifier
brush box and regulator from rectifier.
Unsolder the regulator to brush box ter
minals and separate regulator from
brush box.
Renew brush holder assembly if brush
"
"
free
length from end of holder
2
(0.080
than
mm
allowable length is marked on the
brushes by a groove on one side of each
brush.
<lip
Th
check alternator
13
to
15
volts.
If
15.5
volts,
13
volts, insert a pin
.
If
13
volts.
(14)
and rear housing
alignment
for
(1),
(3)
from rotor shaft.
from end frame and
(11).
Unsolder
is
less
inch). This minimum
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