When the main pumps have been serviced or the hydraulic oil has been replaced, remove the air from the main pump. Remove the air from the main pump in the following manner:
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates. |
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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
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| Illustration 1 | g02125234 |
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This tooling group is used to purge the air from the main pumps. | |
| Tool | Item | Part Number | Description | Qty |
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| F | F1 | 6V-3965 | Fitting | 1 |
| F2 | 3J-1907 | O-Ring Seal | 1 | |
| H | H1 | 6V-3965 | Fitting | 1 |
| H2 | 6V-4143 | Quick Connect Coupler | 2 | |
| H3 | 177-7860 | Hose As | 1 |
- While the engine is stopped, remove plug (1).
- Fill the main pumps with oil.
- Install tooling (F) into the fill port.
- Install hose assembly (H) onto tooling (F). Place the open end of tooling (H) into a suitable container.
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NOTICE To avoid system damage, make sure that the hydraulic pump is properly filled with hydraulic oil before start-up.
- Start the engine.
- Place the engine at low idle position. Raise the boom and hold the boom in this position.
- When oil begins to flow from hose assembly (H), stop the engine.
- Place the hydraulic activation control lever in the UNLOCKED position.
- Slowly lower the boom until the work tool is on the ground. Allow the oil to flow from hose assembly (H).
Note: The boom lower operation will pressurize the hydraulic tank.
- Remove hose assembly (H).
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| Illustration 2 | g02118535 |
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Pump compartment (1) Plug (2) Case drain hose | |