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open flame or spark and store machine away
from open flame or spark if there is fuel in the
tank. Read and observe safety precautions at
front of this manual.
The 11 U.S. gallon (41.6 liter) fuel tank is located in the
tractor’s right fender. It is equipped with a gauge built into
the filler cap.
There is a fuel shut-off valve installed on the fuel tank.
Close this valve to prevent fuel loss or spill whenever
changing filter, performing maintenance, transporting or
storing the tractor.
Models 4200, 4400, 4420 and 4600: This engine requires
number 2 diesel fuel only. The spin-on type fuel filter is
located on the left, rear side of the engine. Change filter
after every 400 hours of operation or annually, whichever
occurs first.
Diesel engines are subject to air blockage whenever the
fuel tank runs empty, the fuel filter has been removed, any
fuel lines have been disconnected or removed and replaced,
or when the tractor has been stored for a period of time.
Should such air blockage occur, it will be necessary to bleed
the system, removing any trapped air between the fuel tank
and filter, then trapped air between the filter and injector
pump as follows:
1. Fill the tank with fresh fuel and make sure the shut-off
valve is open at tank.
2. Loosen the vent screw (Fig. 5-13) located on top of the
fuel filter and leave it open until air bubbles are no
longer present, then close the vent screw.
3. Loosen the vent screw on the injector pump (Fig. 5-
14). Operate the hand priming lever (located below
the injector pump) 10 to 30 times.
4. Start the engine and run at low rpm for 15 to 30
seconds to expel air from pump, then close the air vent
screw.
5. If engine fails to start, repeat steps 2, 3 and 4.
Models 4300 and 4500: This engine is designed to use
unleaded gasoline with a minimum octane rating of 87. See
engine manual for exceptions.
The fuel filter is located on the left side of the carburetor
(Fig. 5-15). Change filter every 400 hours or annually,
whichever occurs first. When changing filter, by sure to
note direction of fuel flow marked on filter case.
When replacing the fuel filter, check the fuel line hoses
for any cracks or leaks. Replace as needed.
Engine oil and filter
Check engine oil daily and after every 4 hours of
operation. Tractor must be setting level when checking oil.
Refer to engine manual and maintenance schedule for oil
recommendation and capacities.
Engine air filter
A specially designed two-stage dry filter, with restriction
indicator (Fig. 5-16), supplies clean combustion air to the
engine. This is a self-cleaning element, but it needs to be
replaced whenever the restriction indicator shows red.
Check the indicator daily and replace element as needed or
annually whichever occurs first.
Recommended service procedure
Many engine failures can be attributed to improper air
cleaner servicing. Ingested dust and dirt will cause cylinder,
piston and bearing damage in a few hours. “Dusted”
engines will result from:
1. Overservicing the air filter element.
2. Improper installation.
728444 Rev. 11/02
5-13
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