Hydraulic System Oil - Change
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| NOTICE |
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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, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
- Park the machine on level ground. Stop the engine.
- Open the hood. Refer to Operation and Maintenance Manual, "Hood Tilt" for the procedure.
- Press hydraulic tank breaker relief valve (2) in order to relieve any tank pressure.
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| Illustration 1 | g00827628 |
- Remove the hydraulic tank access cover that is located under the upper structure. This will allow access to the drain plug.
Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information that pertains to containing fluid spillage.
- Remove the plug from the bottom of the hydraulic tank. Wash the drain plug in a clean, nonflammable solvent.
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| Illustration 2 | g00791806 |
- The hydraulic tank is equipped with an ecology drain valve. Attach a hose to a 126-7914 Oil Drain Coupling. Install the threaded end of the coupling into the drain valve in order to unseat the internal drain valve.
- Drain the hydraulic oil into a suitable container.
- After the oil has been drained, tighten the drain plug to a torque of 68 ± 7 N·m (50 ± 5 lb ft).
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| NOTICE |
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Never start the engine while the hydraulic oil tank is being drained or while the hydraulic oil tank is empty. Excessive wear and damage to the hydraulic components can occur. |
- Clean the pump, the hydraulic lines and the hydraulic tank.
- A strainer is located under oil filler cap (1). Remove the oil filler cap. Remove the strainer.
- Wash the strainer in clean, nonflammable solvent. Inspect the strainer for damage. Replace the strainer if the strainer is damaged.
- Install the strainer.
- Fill the hydraulic oil tank through filler cap (1) .
Note: Make no attempt to start the engine until the pump has been filled with hydraulic oil. Serious damage to the hydraulic components can result.
- When the hydraulic oil has been replaced, the air must be removed from the hydraulic oil system. To remove the air from the hydraulic oil system, follow Step 15.a through Step 15.g.
- While the engine is stopped, remove air purge plug (4). Do not install the air purge plug until the pump is filled with hydraulic oil.
- Disconnect hose (5) from upper hydraulic implement pump (3). Check the condition of the seal. If the seal is damaged, replace the seal.
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Illustration 4 g00791804
- After the pump has been filled with oil, install hose (5) to the original location. Install air purge plug (4) .
- Start the engine. When the engine is at low idle, fully raise the boom. Hold the boom in this position.
- Stop the engine. Slowly lower the boom until the felling head is on the ground. This pressurizes the hydraulic tank.
- Slowly loosen air purge plug (4) until the hydraulic oil flows out of the opening. This indicates that the air has been released from the pump.
- Tighten air purge plug (4) .
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| Illustration 3 | g00791966 |
- Start the engine. Operate the engine at idling speed for five minutes.
- Operate the joysticks in order to circulate the hydraulic oil. Lower the felling head to the ground. Stop the engine.
- Maintain the oil level between the marks on the sight gauge in the appropriate temperature range.
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| Illustration 5 | g00827628 |
(A) High temperature range (B) Low temperature range | |
- Close the hood.
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