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Do It Yourself Tractor Service : Quality Economical Compact Diesel Tractors



Click Below for specifics:

· Yanmar Oil Filter Service

· Yanmar Air Filter Service

· Yanmar Hydraulic Filter Service

· Yanmar Clutch Replacement

· Yanmar Fuel Filter Service


 Yanmar Oil Filter Service
Interval - 100 Hours ~ Time Required - 15 Minutes


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Nothing will ruin your engine as fast as low or no oil pressure. Complete engine lock-up can occur in just seconds.There are 3 things that you can do to help prevent this problem due to low oil pressure.

1. Check your oil level before each use.

2. Replace your filters with quality filters that are designed for diesel engine     service.

3. Change your oil and filter at least every 100 hours. Here is how:

yanmar oil filter change

  • 1. Loosen and remove drain plug located at the bottom of the engine in the oil pan.
  • 2 - Allow oil to drain for several minutes. Be sure that all of the oil has drained  from the engine because any remaining dirty oil will contaminate the new oil.
  • 3 - Remove oil filter with a filter wrench or a pair of channel lock pliers. Some tractors may have shields that need to be removed before you can remove the filter. Be sure to remove the old gasket! If you install the new filter without removing the old gasket the filter may suddenly start leaking. Sometimes days after changing the oil!
  • 4 - Make sure the filter housing is clean. Put a small film of oil on the new filter to help it seal. Screw the filter on as tight as you can by hand, then, with a filter wrench (never use channel locks on a new filter. They can damage the filter and cause it to leak) tighten an additional 1/4 turn or as directed on the filter.
  • 5 - Replace drain plug and tighten. Do not over tighten or you could damage the threads in the oil pan! Fill with the recommended type and quantity of oil.
  • 6 - Start tractor and watch for the oil pressure light to go off or for the oil pressure gauge to show normal oil pressure. If you do not get oil pressure within a few seconds you could cause damage to your engine. Check for leaks around filter and drain plug.


 Yanmar Air Filter Service
Interval - 10 to 50 Hours ~ Time Required - 10 Minutes


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Few things can destroy your engine as fast as a faulty air cleaner. One might think that even though the filter is dirty- no damage is hapening because contamination is still not getting through. WRONG! As the filter clogs up with dirt and debris, the vacuum on the filer increases. This pulls dirt in from tiny openings that, without the added pressure, would be too small to allow dirt to pass. The dirtier the filter gets, the more suction there is until the paper element finally gives out and begins to tear away. Your tractor will also lose up to 80% of its power as the filter clogs.

It is recommended that you service your air filter every 10 to 50 hours depending on your environment or as directed in your owners manual. It is also recommended that you replace your filter with a new one every few seasons or after the 5th cleaning. Yanmar uses two types of air cleaners on their tractors. One that is a flat round filter and a round one like the filter pictured below. Both are serviced in the same way.

    What you will need:

  • Compressed air
  • Blower
  • To clean your filter you will need to remove the air filter cover by loosening a wing nut or opening a couple latches on the end cap.
  • You will then need to remove the filter by loosening the nut that holds the filter in. Make sure to wipe (not blow) out all o the dirt in the bottom of the air filter housing after the filter is removed. Blowing after the filter is removed will force dirt directly into the engine. Check the inside of your filter for any signs of dirt. A dirty spot on the inside of the filter usually means that the filter is leaking and needs to be replaced. Use a flashlight on the outside while looking through the inside to help find any holes.
  • Inspect the gasket portion of the filter. Any damage here can leak dirt into the engine. Replace if damage is found. Using compressed air at about 35-50 psi; blow from the inside out. You may need to tap the filter on the ground a few times to loosen up the dirt in the filter before it will blow out easily. Using compressed air at a higher psi may damage the filter paper and allow dirt to get into your engine!
  • Most filter lids will have a two-piece cap that is designed to trap dirt. You will need to either separate this cap and clean it or just be sure that you have gotten all of the dirt our of it.

    Replace filter in reverse order.

 Yanmar Hydraulic Filter Service
Interval - 250 Hours / Every Year ~ Time Required - 20 Minutes


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Yanmar uses 1 reservoir for both the hydraulic oil and the transmission oil. This oil is Hydraulic Transmission oil. Never use simple Hydraulic oil.

The hydraulic pump on all Yanmar tractors is very simple. It is basically two gears running together at high speeds to move the oil. These gears must have extremely tight tolerances in order for this to work. Because of these tight tolerances, and dirt or debris will almost always destroy a pump.

Because of this, it is important that your oil be clean and your filter or screen be serviced periodically. Not all Yanmar tractors have hydraulic filters. In fact only the '20 series, '02 series, some of the F and Fx series gray market, and some of the US versions have a spin on filter. Most have small tubular screens inside the transmission housing that filter the oil.

If your tractor has a spin on filter, replacement is a breeze.

  • 1 - Be sure that you have a replacement filter on hand. These are not filters that you will find at a local parts store.
  • 2 - Using a filter wrench or channel lock pliers, remove the oil filter. As the oil is draining out of the filter housing, remove the drain plug. This is located just below the rear axles. There may be two or more plugs that you will need to remove in order to get all of the oil drained. Use a large drain pan as it may hold many gallons.
  • 3 - If your tractor has the screen type filter, after the oil has drained, locate the screen. The screen will always be in the transmission housing. It will usually be on the directly on the opposite side of the large hydraulic suction line that goes into the right (sitting on the seat) side of the transmission. You will need to remove a 2-4-bolt plate that holds this filter in. The filter may also be directly behind the large suction line. To remove this filter you will need to remove the rubber hose connection that couples the two sections of steel hydraulic line together. Then remove the 3-4-bolt plate where the line goes into the transmission. The screen will be behind that plate. If the screen is in none of these places, it will be behind a 2-3-bolt plate at the very button of the transmission. Refer to your parts manual or operation manual for exact location.
  • 4 - Clean the screen with a carburetor cleaner or fresh diesel.
  • 5 - Re-install screen and cover. Re-fill with the correct amount of Hydraulic Transmission oil. Never use a simple Hydraulic oil. Check periodically with the dipstick or check your Yanmar operation manual for your tractor.
  • 6 - Start tractor and check for leaks.


 Yanmar Clutch Replacement
Interval - As Needed ~ Time Required - 4 - 8 Hours


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One of the most complicated basic maintenance issues you will run into on any compact tractor is a clutch replacement. Just like in your car, clutches in a tractor do not last forever. This job is a 5 star job because of the many steps and some special tools that you will need to buy or rent. It is not a complicated job but it will take some time. If you do not want to tackle this job yourself, and local mechanic can do the job for you.

The job itself is really straightforward. You will split the tractor at the bell housing. This is the "bell" shaped housing immediately behind the engine. The time consuming part of this job will be removing all of the hoses, wires, and linkages that connect the two sections of the tractor. You will need to remove all hoses, linkages, wires, etc before you start. The tractor will actually need to be in 2 separate pieces when you are done.

You will need a jack under the front and rear end of the split. Determine what end will be the heaviest and put your jack under that end. One end will need to be able to roll away from the other so a "cherry picker" or even a rolling floor jack is a must.

Remove the bolts at the bell housing after the tractor is fully supported. If your jack is at the wrong end, the tractor halves will flop over! BAD NEWS! Be careful.

Once the bolts are out- this is the scary part- the tractor should slide apart fairly easy. You might need to remove the drive shaft on 4wd tractor to allow the tractor to split.

Roll the 2 halves apart. You will see, on the engine side, the pressure plate. It will be the piece with the many "fingers" on the inside. The bolts surrounding it hold on the pressure plate. Remove these and the plate will fall off. Remove the disc as well (if it did not fall off with the plate). The throw out bearing will be on the transmission side and will slide off of the main shaft with its carrier. The throw out bearing will usually slide off of the carrier with a little persuasion from a hammer or press.

Check the pilot bushing and replace if necessary.

Check the clutch input shaft for damaged or sharp splines.

Do not remove it unless you are going to replace it. Replace shaft if splines are wore or damaged.

You don’t want to have to do this again in a few months!

Re-install the throw out bearing onto the carrier just like it came off. You may need to use a vice or press to get it back on.
Put a small amount of grease on the pilot bushing to make it easier to get together.

You may need to rent a lineup tool from a local parts shop to get the components lined up for reinstallation. The splines and pilot bushing must be EXACTLY lined up or the halves will not go back together. Slide the disc over the lineup tool and slide the tool into the pilot bushing. Slide the pressure plate over the tool and hold the tool exactly parallel with the frame of the tractor. Tighten down the pressure plate bolts. This will hold the clutch into position. Remove the tool and slide the 2 halves of the tractor together again. It will take a lit of fiddling to get the shaft perfectly lined up in the splines and the pilot bushing. When it is all lined up, it will glide in as smooth as glass. NEVER TRY TO FORCE THE HAVES TOGETHER BY DRAWING THE BELL HOUSING BOLTS IN!!! You may think that it will never go together but it will.


 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 affect performance and cannot harm the tractor. WRONG! Starving an injection pump for fuel can permanently damage the pump. The water that is collected by the filter will permanently 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 plastic 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. Carburetor cleaner or other harsh solvents will cloud over plastic bowls.
  • 5 - Always replace your fuel filter bowl o-ring 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.