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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 as shown in fig. B.
2 - On most Yanmar tractors- Remove the element housing by unscrewing the housing. If you are replacing a disposable type filter remove the hose clamps and hoses.
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 solvent.
5 - Examine O-ring and be sure it is not hard or cracked. Replace of questionable. A leaking O-ring will cause the tractor to be hard to start and smoke.
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(Yanmar tractors) , where the fuel line goes into the pump (as shown in fig D). 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 picture E. 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.
We have a full line of fuel, oil, and air filters in stock, ready to ship for all Yanmar and most Iseki tractors. We have even done all of the cross reference work for you! Just click on your model and order. Most orders shipped on same day.
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Be sure to pick up an owner's manual or a parts manual for your tractor.
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