ENGAGEMENT UNIT
Check pinion tooth wear, and the condition
of
the
mechanical components and
of
the freewheel. Be
sure to clean it thoroughly and,
if
necessary,
tacts, and reface them
if
necessary with emery
paper.
replace it. ·
STARTER
CONTACTS AND SOLENOID SWITCHES
Check for wear and surface condition
of
the con-
Test the solenoid coils for opens and grounds.
Always replace the complete units,
as
components
are not individually available in parts.
TROUBLES IN STARTER OPERATION CAUSES AND THEIR REMEDIES
Trouble
Starter inoperative or
turning
too
slow.
Starter makes
too
much noise
while rotating.
Starter turns but fails
to
start
the engine.
Starter
output
falls
short
of
full
power rating.
Quick wearing
of
brushes.
Possible causes
1.
Battery
connections
and
terminals loose
or
oxidized.
2.
State
of
charge
of
battery
zero or very low.
3.
No
contact
of
brushes
with
collect
or
due to brushes
sticking
into
brush-holders,
excessive wear, broken
or
out
of
shape springs, in·
sertion
of
dirt.
4.
Starting
switch
contacts oxi-
dized, worn or insulated by
insertion
of
dirt.
5.
Armature
or
field windings
partially shorted or grounded.
Blacking
of
insulators, dam·
aged
collector
bars.
6.
Thrown
commutator
bars.
7.
Excessive
voltage
drop
throughout
cables, damaged
cables, loose cable connec·
tions.
1.
Excessive wear
of
armature
shaft self-lubricating bearings.
2.
Pinion disengage from fly·
wheel rim is delayed.
'
1.
Worn
out
pinion
or
flywheel
rim teeth.
2.
Pinion meshes
with
r,!ng
gear
but fails
to
transmit torque.
Starter drive failure.
1.
Low battery charge.
2.
Brushes
sticky
in holder.
3.
Idling drive control
or
clutch
coupling
slip.
4.
Brushes were not seated.
1.
High
commutator
bar.
2.
Mica
above copper blades.
3. Loose brush-holder screws.
4.
Wrong type
of
brushes.
Electrical System ·
204
Remedy
Remove terminals, clean con·
nections
and
terminals
thoroughly,
refit
them
and
tighten
the screws and then app-
ly a thin layer
of
pure petroleum
jelly
to preserve them from cor-
rosion.
Check battery charge state, or,
if
necessary replace it.
Locate the
point
of
current
losses (battery, cables, equip·
ment).
Check brushes, and clean brush·
holder guides and collector.
If necessary, replace brushes
and springs
with
genuine ones.
Check and clean the contacts.
The oxidation may be due
to
shorted
coils
because
of
ex·
cessive current absorption.
Replace defective components.
Replace the armature assembly.
Check cables and connections.
Replace bushings.
Defective engagement
controls
due
to
friction
or knocks
of
the
shifter fork, strained return spring,
friction
of
driving bushing on the
shaft or solenoid armature in
its
seat.
Remove
and
replace
the
necessary components.
Replace
pinion
or
flywheel gear
ring
or
both.
Overhaul
it
and lubricate com-
ponents.
Replace the
complete
unit.
Charge
the
battery.
Clean brush-holders.
Repair
or
replace
the
units.
Set
the
brushes properly by run·
ning
the starter
idle
a while, at
30-40 seconds intervals.
Turn
it
down.
Undercut the
collector.
Tighten
the
screws.
Replace them and make sure
that new ones correspond to the
tractor
Parts Book.
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