Allis-Chalmers WD Operating Instructions And Repair Parts Illustrations page 28

The following suggestions are listed for your
You can make simple adjustments
assistance.
on your tractor that will improve its operation
and save you the time and expense of engaging a
serviceman.
ENGINE FAILS TO START
Fuel valve shut off.
Low octane fuel in carburetor from last
operation,
Float valve sticking.
Fuel tank empty.
Clogged fuel filter or fuel lines.
Dirty or clogged air cleaner.
Leaking or loose manifold.
Engine flooded.
Broken wires from magneto to engine.
Wires not in proper position.
Switch not turned on or defective.
Spark plugs wet, dirty or broken.
Magneto weak or out of time.
Spark plug points not properly spaced.
Magneto points pitted,
spaced.
ENGINE OVERHEATED
Low water level in cooling system.
Radiator clogged.
Fan belt slipping.
Collapsed radiator hose.
Thermostat stuck.
Tractor overloaded.
Fuel mixture too lean.
Weak spark.
Diluted lubricating oil.
Pulling heavy load at reduced R.P.M.
Water pump impellor
DIAGNOSING ENGINE DIFFICULTY
dirty or improperly
vanes broken.
adjustment made does not improve the condition,
return to the original setting before proceeding
to the next adjustment.
GENERATORFAILSTOCHARGE
The cut-out relay, attached to generator case,
prevents the battery from discharging through the
generator when generator is idle.
If ammeter fails to show a charging rate one of
the following may be the cause:
1. Loose or corroded wire connections.
2. Broken wires.
3. Faulty ammeter.
4. Oily or gumm y generator brushes or
commutator.
5. Worn generator brushes.
Commutator and brushes can be cleaned with
grade "00" sandpaper. (Do not use emery cloth).
STARTER FAILS
The starting motor seldom causes any difficulty,
but if it should, any one of the following mayh
the cause:
1. Exhausted battery.
2. Broken or loose wires.
3. Loose or corroded battery terminals.
4. Starter switch making poor contact.
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