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FUEL
At the end of each day’s use, refill the fuel tank
to minimize moisture condensation and dirt contami-
nation in the fuel line. Do not overfill; leave room for
the fuel to expand.
Use only fresh, No. 2 grade DIESEL fuel. Do not use
kerosene.
See the Kubota Engine Operator's Manual for instruc-
tions on replacing the fuel filter. See Table D.2 for rec-
ommended fuel filters.
BLEEDING THE FUEL SYSTEM
You will need to bleed air from the fuel system any
time the fuel filter or fuel lines have been detached and
refitted; after the fuel tank has been run out of fuel; or
before using the engine after long storage. Bleed the
fuel system as follows:
To avoid personal injury, do not bleed a hot engine.
This could cause fuel to spill onto a hot exhaust man-
ifold, creating a danger of fire.
Refer to Figure D.2
1. Fill the fuel tank. Open the fuel cock.
2. Open the air vent plug on the fuel injection pump
two turns using a 10mm wrench.
3. Move the fuel feed pump lever by hand until fuel
flows out of the air vent plug.
4. Tighten the air vent plug.
FIGURE D.2
FUEL BLEEDING COMPONENT LOCATIONS
AIR CLEANER
The Kubota diesel engine is equipped with a dry type air
filter. Never apply oil to it. See Table D.2 for recom-
mended air cleaner. Service the air cleaner as follows:
1. Remove the dust cup from the bottom of the air
cleaner housing. Clean out any accumulated dust.
2. If dust is sticking to the element, blow compressed
air through the element from the inside out. Turn
the element as you apply air. Air pressure should
be under 99 psi (68 newton/cm
2
). Replace the fil-
ter if there is carbon or oil on the element.
3. Replace the element at least every 600 hours of
operation and sooner under dusty conditions.
TIGHTENING THE FAN BELT
If the fan belt is loose, the engine can overheat and the
battery lose its charge. Check tightness by pressing
on the belt midway between the pulleys. It should
deflect about .25 in. (6 mm) under a load of 20 lbs.
(9 Kg).
COOLING SYSTEM
HOT COOLANT can burn skin.
• Do not remove cap if radiator is
hot.
Check the coolant level by observing the level in the
plastic reserve overflow tank. Add 50/50 antifreeze/
water solution if the level is close to or below the
“LOW” mark. Do not fill above the “FULL” mark.
Remove radiator cap and add coolant to radiator if
overflow tank is empty.
To drain the coolant, open the petcock at the bottom
of the radiator. Open the radiator cap to allow com-
plete drainage. (Tighten the petcock and refill with a
50/50 antifreeze/water solution.) Use an automotive
grade (low silicate) ethylene glycol antifreeze. The
cooling system capacity is 5.4 quarts (5.1l.). Replace
and tighten the radiator cap.
MAINTENANCE
D-4 D-4
RANGER 300 D AND 300 DLX
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WARNING
AIR VENT PLUG
FUEL FEED PUMP LEVER
WARNING
AIR VENT PLUG
FUEL FEED PUMP LEVER