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Kubota L-40 Series Service
Pictures are of an L3940, concepts apply to other simular models.
L3240,L3540,L3940,L4240,L4740,L5240,L5740

Before performing any of the following operations, be sure that engine is stopped and has been given adequate time to cool down


Cleaning the Fuel Filter

Make sure that you are in a clean area to do this service

  1. Close fuel cock

  2. Loosen and take off filter bowl

  3. Rinse filter bowl with kerosene

  4. Remove filter and dip it in kerosene to rinse

  5. Put filter assembly back together and make sure to keep out dust and dirt

  6. Bleed fuel system

Fuel filter should be cleaned after every 100 hours

Replacing the Fuel Filter

Follow the same steps for cleaning the fuel filter
Replace fuel filter after every 200 hours of operation


Changing Air Cleaner Primary Element

  1. Remove air cleaner cover by undoing the hook and then rotating the cover clockwise to take it off.

  2. Clean or Replace the filter (see below)

  3. Reinstall air cleaner cover (make sure that arrows are properly aligned).

If filter only contains dust: Blow compressed air (under 30psi, 205kPa, 2.1kgf/cm2) from the inside of the filter to clean it. If filter contains carbon or oil: Soak filter in detergent for 15 minutes, wash and rinse with water and let it air dry. When filter has completely dried, use a light to check for damage.

Clean primary element after every 100 hours

Replace both air filters yearly, or after every 6th cleaning, whichever comes first. Also make sure evacuator valve is not blocked

Evacuator valve should be opened once a week, or daily when used in a dusty place in order to get rid of larger dust particles




Adjusting Fan Belt Tension

  1. Make sure engine is off

  2. Check belt for damage, if belt is damaged, replace

  3. Apply some pressure to belt halfway between pulleys to check tension

  4. If tension is not what it should be, loosen the alternator mounting bolts and, using a lever placed between the alternator and the engine block pull the alternator out until the tension is correct

Fan belt should have a deflection between 0.28 - 0.34” (7 – 9mm) when the belt is pressed in the middle of the span

Check fan belt tension after every 100 hours of operation


Replacing Engine Oil Filter

  1. Make sure that engine is off and has been given sufficient time to cool down

  2. Remove old oil filter

  3. Apply a small amount of engine oil to the rubber seal of the new filter

  4. Tighten filter quickly until it touches the mounting surface

  5. Tighten filter an additional ½ turn

When a new filter is installed, engine oil typically decreases a little. Ensure that oil does not leak through the seal of the filter, then refill oil as needed.

Replace engine oil filter after every 200 hours of operation

Changing Engine Oil

  1. Remove drain plugs (2) from bottom of the engine while engine is still somewhat warm (allow plenty of time for engine to cool down) to drain oil into oil pan

  2. Put drain plugs back in when oil has drained

  3. Fill with new oil to the higher groove of the dipstick

Oil capacity with filter - L3240 – 6.0 quarts (5.7 liters)

L3540 – 7.1 quarts (6.7 liters)
L3940, L4240, L4740 – 8.7 quarts (8.2 liters)
L5040, L5240, L5740 – 9.9 quarts (9.4 liters)

Engine oil should be changed after every 200 hours of operation




Replacing Transmission Oil Filter [HST Type]

  1. Take drain plugs (3) out of the bottom of the transmission case

  2. Drain oil

  3. Put drain plugs back in

  4. Apply a small amount of clean transmission oil to the rubber seal of the new filter

  5. Tighten filter quickly until it touches the mounting surface

  6. Tighten filter an additional turn

  7. Refill transmission oil after filter has been replaced

  8. Run engine for a few minutes, stop engine, and refill transmission oil as needed

  9. Check seal of filter for leaks

Replace transmission oil filter after every 200 hours of operation




Changing Transmission Fluid / Replacing Hydraulic Oil Filter

  1. Take drain plugs (number of drain plugs varies according to model) out of the bottom of the transmission case

  2. Drain oil

  3. Put drain plugs back in

  4. Apply a small amount of clean transmission oil to the rubber seal of the new filter

  5. Tighten filter quickly until it touches the mounting surface

  6. Tighten filter an additional turn

  7. Refill transmission oil after filter has been replaced

  8. Run engine for a few minutes, stop engine, and refill transmission oil as needed

  9. Check seal of filter for leaks

Oil capacity – L3240, L3540 – 11.1 gallons (42 liters)
L3940, L4240, L4740 – 11.4 gallons (43 liters)
L5040, L5240, L5740 – 11.9 gallons (45 liters)

Replace transmission fluid / hydraulic oil filter after every 400 hours of operation

Do not operate equipment immediately after changing the transmission fluid. Run engine at medium speed for a few minutes prior to use




Changing Front Axle Case Oil

  1. Remove filler plugs and drain plugs on both right and left side of tractor to drain oil

  2. Put drain plugs back in after oil has completely drained

  3. Take oil level check plug out

  4. Fill oil in front axle case up to the check plug port

  5. Put check plug and filling plug back in

Oil capacity – L3240, L3540, L3940 – 6.9 quarts (6.5 liters)
L4240, L4740, L5040, L5240, L5740 – 9.5 quarts (9.0 liters)

Change front axle case oil after every 400 hours of operation


Draining Clutch Housing Water

Water may get into the clutch housing after operating in rain, snow, or after tractor has been washed.

To check if water is in clutch housing push in the split pin plug

If water is in clutch housing remove plug, drain water, and put plug back in


Lubricating Grease Fittings

Apply multipurpose grease to the following places every 50 hours (or more often if you operate in a very wet or muddy location):

  1. Knuckle Shaft (right and left side of tractor [2WD])

  2. Front wheel case support (both sides of tractor) – When applying grease here take the breather plug out and apply grease until it overflows from the breather plug port (L4240, L4740, L5040, L5240, L5740)

  3. Front axle support

  4. 3 point lift cylinders (4 fittings)

  5. 3 point hitch linkage (top link [2], right hand lifting rod, top link bracket [2])

  6. Battery terminals

 

Wheel Bolt Torque

Check wheel bolts regularly as follows:

  1. Front wheel nuts 100 ft-lbs torque (L3240, L3540, L3940, L4240, L4740)

  2. Front wheel nuts 136 ft-lbs torque (L5040, L5240, L5740)

  3. Rear wheel nuts and bolts 160 ft-lbs torque (All models)

 

Bleeding the Fuel System

Fuel system needs to be bled in the following situations:

  • When the fuel filter or lines are removed

  • When fuel tank is completely empty

  • After the tractor has not been used for a long period of time

To bleed fuel system:

  1. Fill fuel tank

  2. Open fuel cock

  3. Open air vent cock on injection pump

  4. Start engine and run for about 30 seconds

  5. Stop engine

  6. Close air vent cock

Keep air vent cock closed unless you are bleeding the fuel lines