Komatsu Komatsu Bulldozer D31EX-21 D31EX-21

WARNING: Engine is at high temperature immediately after the machine has been operated. Wait for engine to cool down before replacing the filter. Do not bring fire or sparks near the fuel.

Prepare a filter wrench and a container to catch the fuel.

Set the container to catch the fuel under the filter cartridge.

Using a filter wrench, turn filter cartridge (1) counterclockwise to remove it.

Clean the filter holder, fill a new filter cartridge with clean fuel, coat the packing surface with engine oil, then install it to the filter holder.

When installing, tighten until the packing surface contacts the seal surface of the filter holder, then tighten it up 1/2 to 3/4 of a turn.

After completing the replacement of filter cartridge (1), bleed the air.

METHOD OF USING AUTOMATIC AIR BLEED MECHANISM (If equipped)

CHECK, CLEAN AND REPLACE AIR CLEANER ELEMENT

q If inspection, cleaning, or maintenance is carried out with the engine running, dirt will get into the engine and damage it. Always stop the engine before carrying out these operations.

q When using compressed air, there is danger that dirt may be blown around and cause serious injury.

Always use safety glasses, dust mask, and other protective equipment.

1. Open engine side cover on the left side of machine.

2. If the yellow piston at the display portion of dust indicator (1) becomes red (7.5 kPa), clean the element.

If any abnormality is found, describe it here

Contact your Komatsu distributor for repairs or replacement if any abnormality is found.

Sign off on the 4000 Hourly Bulldozer Maintenance

WARNING: The oil is at high temperature immediately after the machine has been operated. Wait for the oil to cool down before starting the operation. If there is still pressure remaining inside the case, the oil or plug may fly out. Loosen the plug slowly to release the pressure.

Set the TOP mark at the top, with the UP mark and plug (P) perpendicular to the ground surface.

Set a container under plug (P) to catch the oil.

Remove plugs (P) and (F) with the handle and drain the oil.

Check the O-rings in the plugs for damage. If necessary, replace with new ones.

Add oil through the hole of plug (F).

When oil begins to overflow from the plug (F) hole, install plug (F).

CHANGE OIL IN HYDRAULIC TANK, REPLACE OIL FILTER CARTRIDGE AND CLEAN SUCTION STRAINER

• The parts and oil are at high temperature after the engine is stopped, and may cause burns. Wait for the temperature to go down before starting the work.

• When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.

1. Lower the blade to the ground securely, stop the engine and slowly turn the cap of oil filler (F) to release the internal pressure. Then, remove the cap.

2. Remove the cover (1) at the bottom of the hydraulic tank.

3. Place a container to receive drained oil on the track under the drain hole.

4. Loosen drain valve (2) at lower side of hydraulic tank to drain the oil, then tighten valve (2) again.