D8T Track-Type Tractor Hydraulic System Filter Screens - Clean Caterpillar

The screen should be cleaned especially when one of the following situations have occurred:

• Failure of the Implement Pump

• Failure of the Fan Pump

• Failure of the Fan Motor

• Cleaning of the Hydraulic Tank

• PCR (Engine Overhaul)

1. Park the machine on a level surface. Lower the work tool to the ground. Engage the parking brake.

2. Turn the engine start switch key to ON.

3. Move the hydraulic control levers through all of the positions in order to release pressure.

4. Turn the engine start switch key to OFF.
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   At operating temperature, the hydraulic tank is hot and under pressure. Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin. Before removing the filler cap, press the valve relief button on the hydraulic tank in order to relieve the tank pressure. Remove the filler cap only when the engine is stopped and the filler cap is cool enough to touch with your bare hand. Remove the filler cap slowly in order to relieve any remaining pressure.

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   Illustration 1	g01943757
   Front view of the hydraulic tank (1) Filler Cap (2) Relief Valve (3) Sight Gauge (4) Drain Plug

5. Press button (2) on the breaker relief valve in order to relieve any tank pressure. Slowly remove filler cap (1).
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   Illustration 2	g01943758
   Top view of the Hydraulic Tank

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   Illustration 3	g01943759
   Bottom view of the Hydraulic Tank (5) Implement return port (6) Hydraulic tank access cover (7) Case drain return port (8) Suction port

6. Drain the hydraulic oil tank at drain (4).

   Reference: For the correct procedure, refer to Operation and Maintenance Manual, "Hydraulic System Oil - Change".

7. Disconnect the drain lines.

8. Unbolt hydraulic tank access cover (6).
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   Illustration 4	g01943760
   Return screens (9) Implement return (10) Case drain return

9. Remove return screens that are within reach. Clean the screens with a clean, nonflammable solvent.

10. Inspect the O-ring seal, if the casting is removed. If the seal is damaged, replace the seal.

11. Replace the return screens.

12. Replace hydraulic tank access cover (6).

13. Assemble the drain lines.

14. Fill the hydraulic tank.

    Reference: For the correct procedure, refer to Operation and Maintenance Manual, "Hydraulic System Oil - Change".

15. Replace filler cap (1).