Komatsu Bulldozer D39PX-21

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).

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.

WARNING: The engine will start, so check carefully that the area around the engine is safe before cranking it.

Warning: 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.

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.

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

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

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

For the cab specification machine, cancel lock (3) of the inspection cover at the right side at the rear of the machine, remove the bolts, then remove rear cover (4). Remove the washer tank.

For machines other than the cab specification machines, remove the bolts, then remove the cover at the right side at the rear of the machine and center cover (4) at the rear.

Using the filter wrench, turn filter cartridges (5) and (6) to the left and remove them.

Warning: Carry out this check before operating the machine.

Prepare a container to catch the fuel that is drained.

Open drain valve (1) at the bottom inside the inspection cover on the left side at the rear of the machine and drain the water and sediment accumulated at the bottom together with fuel.

Warning: When doing this, be careful not to get fuel on yourself.

After clear fuel comes out, close drain valve (1).

CHECK, CLEAN AND REPLACE AIR CLEANER ELEMENT

Is the yellow piston at the display portion of dust indicator red (7.5 kPa)?

CLEANING OR REPLACING OUTER ELEMENT

Is the yellow piston rises to above 3/5 (5 kPa) of the transparent portion?

Are there small holes or thinner parts found on the element when checked by shining a light through it after cleaning?

Is the cooling water inside sub-tank (4) cleaned and filled again with cooling water to a point midway between the FULL and LOW marks?

CHECK TRACK SHOE TENSION, ADJUST

Is the clearance between the bar and the grouser at the midpoint 20 to 30 mm?