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Ferguson Tractor TO-20 Operation and Maintenance Manual

ELECTRICAL SYSTEM (Cont'd)
lubrication. Put 8 to 10 drops of light engine oil
in the two hinge cap oilers every 50 hours.
Cau-
tion: Never oil commutator.
Inspection. Remove cover band and inspect com-
mutator and brushes at regular intervals. Clean
dirty commutator with No. 00 sandpaper, blowing
out accumulated dust.
Caution: Do not use emery
paper.
If commutator is rough, out-of-round or
has a high mica glaze, have your Ferguson dealer
repair it. Replace worn brushes.
Adiustment. Generator output may be stepped up
by moving third brush in direction of armature
rotation (counterclockwise, viewed from rear).
To reduce, move third brush in opposite direc-
tion. It is advisable to have your Ferguson dealer
make this adjustment since charging rate is con-
trolled by the voltage regulator, and generator
failure may result
if
output is set too high.
Installation warning: When reinstalling generator
or reconnecting leads after they have been discon-
nected, connect a jumper lead
momentarily
between
battery and generator armature terminals
before
starting tbe
engine.
This provides a current surge
from battery to correctly polarize generator. Do
not operate tractor when generator leads are dis-
connected.
THE STARTER
The 4-pole, 4-field, 6-volt starter
is mounted on the fl
yw
heel housing with a special
flange. Its armature rotates in oilless bushings in
the commutator end and drive housing. The Ben-
dix drive is keyed to the armature shaft . . . auto-
The starter is engaged
by
raising
and moving the gearshift lever
to the right and forward. Starter
operates
when
gearshift
lever
reaches
point
marked
"S"
on
t
ransmission housing.
matically engag-
es the cranking
pinion with the
flywheel
ring
gear when the
cranking motor
armature
begins
to revolve. When
the engine starts,
the flywheel's
overrunning
ef-
fect on the pinion
disengages the
latter
from
the
flywheel.
Starter Maintenance. Ruggedly designed, the
starter should give no trouble other than possible
periodic renewal of brushes. In case of failure,
disconnect terminal lead and remove two mount-
ing bolts holding unit to drive housing and take
entire starting unit to your Ferguson dealer for
inspection and overhaul.
SPARK PLUGS
Recommended are the 18
mm.
AC
#87
Commercial,
Champion
#8
Commercial,
Autolite BT 8 or their equivalent. Examine fre-
quently for excessive carbon deposits, pitted or
burned points and broken porcelain. (Any one of
these will decrease engine efficiency.) Regularly
clean every 300 hours on a sandblasting machine.
Inspection and Maintenance. Regularly check
gap-setting with feeler gauge (preferred setting
.025 inch).
Note:
In setting gap, bend
outside
electrode to prevent cracking the plug porcelain.
Be sure connections are tight and wires in good
condition. Before starting tractor, remove any
moisture collection in spark plug wells with a
dry cloth. Do not overtighten-to do so may dis-
tort gap setting.
VOLTAGE REGULATOR
This sealed unit is built
to last the lifetime of your tractor. Never attempt
to adjust it. Should regulator appear defective,
remove by disconnecting four leads and unscrew-
ing two bolts holdi
ng
to mounting plate back of
instrument panel. Have it checked by your Fer-
guson dealer.
STARTER
SWITCH
Mounted
on
transmission
housing, just ahead of the steering column. Its
contact points are sealed against dirt and mois-
ture . . . are actuated by a plunger projecting in-
side clutch housing. Plunger is actuated by a
rocker connected by a linkage to the reverse shift
rail. When transmission shift rail is moved rear-
ward by shift lever, the rocker forces the plunger
upward, engaging the switch.
Servicing Starter Swrtch
If switch is to be re
-
moved, follow this proce-
dure:
1. Remove battery, igni-
tion and starter cables.
2. Remove four bolts se-
curing switch housing.
3. Raise and tilt switch
forward to remove pin.
(To prevent switch-to-
rail
connecting
link
from dropping down,
fasten with wire or
string.)
4. Pull pin and remove
switch.
s. To
adjust
starter
switch, loosen anchor
nuts and move assem-
bly forward or back-
ward until correct en-
gagement
or
disen-
gagement is obtained.