MD6310 Rotary Drill Caterpillar

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Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.

Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information on containing fluid spillage.

Note: Used filters should always be disposed of according to local regulations.

1. Park the machine on level ground and turn off the engine.

2. Clean the area around each filter to keep dirt out of the hydraulic system.

3. Use the procedures below to replace the following hydraulic oil filters:

   • Main Hydraulic Filters

   • Tank Breather Filter

   • Return Filters

   • Charge Filters

   Note: After all the hydraulic filters have been replaced, check the hydraulic oil level. Refer to Operation and Maintenance Manual, "Hydraulic System Oil Level - Check".

Main Hydraulic Filters

Illustration 1	g06264839
The hydraulic loop filters are at the right-hand base of the mast. (1) Filters

For routine maintenance, perform the following procedure:

1. Turn off the engine to release hydraulic pressure, refer to Operation and Maintenance Manual, "System Pressure Release".

2. Open the plug at the top of the filter one and a half turns.

3. Remove the plug at the bottom and drain the fluid into a suitable container.

4. Once the fluid has drained, reinstall and retighten both plugs.

5. Remove the bowl and inspect the filter inside. Look for any significant visible contamination. Contamination could be an early sign of potential failure.

6. Discard the filter and the associated O-ring.

7. Inspect the filter housing and the bypass valve for possible damage and determine if any component replacement is necessary.

8. Remove any dirt from the housing. Do not let any contaminant enter the outlet.

9. Check that the bowl O-rings are not damaged. Lubricate the thread and sealing surfaces of the new filter with system fluid.

10. Put the filter into the bowl open end first.
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    Illustration 2	g06131661

11. Insert reusable metal core (2) and O-rings (3).

    Note: Ensure that the metal core is properly inserted on the filter.

12. Tighten bowl onto the head. Do not over tighten.

13. Pressurize the system and check for any leaks.

Tank Breather Filter

Illustration 3	g06312743
(4) Tank breather filter

1. Remove the used tank breather filter.

2. Install the new tank breather filter by hand.

Return Filters

Illustration 4	g06264137
(5) Return Filters

There are two return filters on the hydraulic tank

1. Shutdown machine and depressurize the system.

2. Unscrew and remove the filter cover from the head. Use a socket wrench on the hexagon on the filter cover to loosen the cover.

3. Remove the filter and inspect for contamination. Contamination could indicate potential failure.

4. Discard the filter and the associated O-ring.

5. Check the O-rings on the head assembly and replace as necessary before replacing the filter.

6. Lubricate the thread on the filter with clean hydraulic fluid, then screw the filter into the head assembly.

7. Pressurize the system and check for leaks.

Charge Filter

Illustration 5	g06312497
(6) Charge filter

The charge filter is mounted near the main hydraulic filters.

1. Turn off and depressurize system.

2. Loosen, and remove , the housing by using a suitable wrench at the bottom of the filter housing.

   Note: A strap type wrench may be used to loosen the filter housing.

3. Remove the used oil seals from the groove at the top of the filter housing and dispose of properly.

   Note: How the oil seals at the top of the oil filter element housing are arranged.

4. Wash the filter in clean nonflammable solvent. Dry the housing thoroughly.

5. After you clean the filter element, inspect the filter element. If the filter element is damaged or badly contaminated, use the new filter element. Make sure that the filter element is dry.

   Note: New oil seals for the oil filter element housing are supplied with new oil filter element.The proper arrangement of the oil seals was noted when oil seals had been removed.

6. Clean the oil filter mounting base. Makesure theinside of the filter mounting base is free of material from the used oil seals.

7. Place the new oil filter element in the filter housing. Apply a thin coat of hydraulic oil to the new oil seals that were installed on the filter housing.

8. Tighten bowl onto the head. Do not over tighten.

9. Pressurize system and check for leaks.