YANMAR FUEL FILTER SERVICE
INTERVAL - 100 HOURS
TIME REQUIRED - 15 MINUTES
 The
fuel filter is the most overlooked service item on any Yanmar tractor.
It is believed that the fuel filter will only effect performance
and can not harm the tractor. WRONG! Starving an injection pump
for fuel can perminantly damage the pump. The water that is collected
by the filter will permionantly damage the fuel injection pump (cost
up to $800 new!).
A new fuel filter is cheap insurance against premature
injector pump failure. Debris and especially water in the diesel
fuel system can dramatically shorten injector pump life. There are
several types of fuel filters used on these tractors so your tractor
may be slightly different.
Before you start this procedure, fill your fuel
tank completely full of diesel.
 1
- Shut off the fuel going to the filter either by closing the valve
on the filter housing (may be a little difficult to move. Try to
wiggle back and forth to free up valve) or use a pair of vise grips
and clamp off the hose..
2 - On most Yanmar tractors- Remove the element housing
by unscrewing the housing. Remove the disposable filter from the
plasic bowl.
3 - Poor out contents of filter and housing into a
clean container. Check fuel for excessive water (usually a tablespoon
or two). If you see excessive water or contaminants in your fuel
you might want to consider changing your filter more frequently.
4 - Remove the filter element from the housing and
thoroughly clean the housing with a light solvent such as diesel
or mineral spirits. Carburator cleaner or other harsh solvents will
cloud over plastic bowls.
5 - Always replace your fuel filter bowl oring with
a new one every time you change your filter. A leaking O-ring will
cause the tractor to be hard to start and smoke excessively.
6 - Install new filter being sure to install the O-ring
in the popper place. Fill filter and housing with clean fuel.and
tighten by hand. Do not over tighten!
 7
-Loosen the bleeder screw on the fuel injector pump(all Yanmar tractors)
, where the fuel line goes into the pump. Let fuel run out until
there are no air bubbles. The extra fuel that you put in the
tank will put more pressure on the system and make this
a lot easier!
 8
- If you attempted to start the tractor before COMPLETELY bleeding
the air out of the injector pump as described above, you may need
to crank engine over (never for long periods of time- which can
damage starter) while you have the injector lines at the injectors
loose as shown in the picture. Tighten back up as soon as there
is just fuel (no air bubbles) coming out of the lines.You may need
to do this at each injector.
BE SURE TO CHECK OUT OUR SPONSORS FOR YOUR YANMAR
REPLACEMENT PARTS. CLICK HERE.
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