Komatsu Bulldozer D39PX-21

If dirt or sand is found sticking due to work in the soft ground, carry out greasing every 10 hours of operation.

1. Lower the blde to the ground, then stop the engine.

2. Using a grease pump, pump in grease through the grease fittings shown by arrows.

3. After greasing, wipe off any old grease that was pushed out.

(1) Lift cylinder bottom pin (2 places)

(2) Lift cylinder head pin (2 places)

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: 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: 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 water pump for any play in the pulley

Check water pump for any leakage of oil or water

Check water pump for any clogging of the drain hole

Sign off on the 4000 Hourly Bulldozer Maintenance