Maintenance Instructions KUBOTA TIPS
57
IMPORTANT TIPS FOR CARE OF THE KUBOTA
ENGINE
Fuel System
● Fuel must be clean - free from water, dirt, and
organic material. Fuel contamination will greatly
shorten the life of the fuel injection pump and
injectors.
● Change fuel lters on a regular basis and when
contamination is suspected or found in the fuel.
● Model D21d is equipped with an electric fuel
pump; therefore it is normally not necessary to
bleed air out of the fuel system (after running out
of fuel or fuel system maintenance).
● When checking and bleeding the fuel system
use the air vent plug on the fuel lter and the
injector pump. DO NOT attempt to bleed the
fuel system by loosening fuel lines on the fuel
injection pump as this could damage the pump.
Starting/Stopping
● DO NOT use ether or any starting uid in the
air intake. This will damage the engine.
● For starting in cold weather [below 40° F (4° C)],
use the cold start lever to release the hydrostatic
transmissions from the starter cranking load.
● Start engine with the throttle advanced o idle
(1/4 to 1/2 throttle). This will aid starting, espe-
cially in cold weather.
● Keep the battery fully charged.
● Match crankcase oil viscosity to the ambient
tem perature, allowing the engine to crank faster
and start easier.
● Allow engine to run at idle for a few seconds
before stopping engine to avoid run-on or back-
ring.
Cooling System
● Fill the cooling system with a pre-mixed solution
of 50/50 antifreeze (ethylene glycol) and distilled
water.
IMPORTANT: Solution must be pre-mixed be-
fore putting it in the engine (adding pure anti-
freeze into the radiator may cause damage to the
engine by causing overheating).
● Maintain proper uid levels in the radiator and
overow tank.
● Operate the engine at full speed when mowing.
This allows the engine to produce full horse-
power and move more cooling air through the
radiator.
Air Cleaner System
● Use only Donaldson air cleaner elements.
After market elements may not seal in the air
cleaner housing, allowing dirt to enter the en-
gine. Also, af termarket lters often skimp on the
ltration media and require more frequent
replace ment (see following instructions).
● Use the air lter restriction gauge to indicate the
need to service the air lter.
● Do frequently check the Turbine Precleaner for
free movement of the internal fan.
● DO NOT overservice or frequently “disturb” the
air lter. A dirty air lter actually cleans better
than a new one. Changing and cleaning the air
lter too often can actually reduce lter ecien-
cy and in crease the opportunity for traces of
dust to enter the engine. Wait until the element
really needs servicing as indicated by the air l-
ter restriction gauge.
● When the air lter element is removed or re-
placed, make sure all dust is cleaned out of the
air cleaner housing and hose. Use a damp
cloth and wipe the interior of the canister and
hose clean (a lit tle dirt left here will be sucked
into the engine and reduce engine life). When
the lter is reinstalled, make sure the element
is held tight and straight in the canister for
proper seating and sealing.
● Periodically check the air intake hose for cuts,
nicks, etc., and the hose clamps for tightness.
Oil
● Use any top quality oil with an API classication
of CF or higher. DO NOT use oil that is rated for
gasoline engines only (API SE/SF) as this will
cause problems in a diesel engine.
● Single viscosity or multi-viscosity oils may be
used with the viscosity matching ambient tem-
peratures for the engine operating conditions.
This will aid starting in cold weather and assure
proper lubrication in hot weather.
● Use only Kubota oil lters. Aftermarket lters
may not seal properly and/or have the incor-
rect pressure relief valve for proper lubrication.
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