Cat HYDO Oil Change Interval
The standard Cat HYDO oil change interval is every 2000 service hours.
A maintenance interval of 4000 service hours for changing the hydraulic oil is available. The extended interval requires S·O·S monitoring of the hydraulic oil. The interval for S·O·S monitoring is every 500 hours. The maintenance interval for the hydraulic oil filter is not changed.
Machines with hammers are not included in the maintenance interval of 4000 service hours. Machines with hammers must use the intervals that are listed in the Maintenance Interval Schedule. Machines that are used in severe conditions are not included in the maintenance interval 4000 service hours. Machines that are used in severe conditions must use the interval in the Maintenance Interval Schedule.
Cat HYDO Advanced 10 Oil Change Interval
The standard Cat HYDO Advanced 10 oil change interval is every 3000 service hours.
A maintenance interval of 6000 service hours for changing the hydraulic oil is available. The extended interval requires S·O·S monitoring of the hydraulic oil. The interval for S·O·S monitoring is every 500 hours. The maintenance interval for the hydraulic oil filter is not changed.
Machines with hammers are not included in the maintenance interval of 6000 service hours . Machines with hammers must use the intervals that are listed in the Maintenance Interval Schedule. Machines that are used in severe conditions are not included in the maintenance interval 6000 service hours. Machines that are used in severe conditions must use the interval in the Maintenance Interval Schedule.
Procedure to Change the Hydraulic Oil
Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin. |
- Park the machine on level ground. Position the machine so that the right rear corner of the machine is located outside the tracks.
- Extend the stick and the bucket fully. Lower the boom so that the bucket is rested on the ground. Lower the blade to the ground.
Illustration 1 | g01167770 |
- Open the access door to the hydraulic tank. Clean the area thoroughly around the hydraulic oil filler cap in order to prevent dirt from entering the hydraulic tank.
Illustration 2 | g01168803 |
301.6C and 301.8C |
Illustration 3 | g01168804 |
302.5C |
- The hydraulic oil drain plug is located on the bottom of the hydraulic oil tank.
NOTICE |
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Hot oil can cause personal injury. Remove the hydraulic oil filler cap only when the engine is stopped. Allow time for the hydraulic system to cool. Remove hydraulic oil filler cap slowly in order to relieve pressure. |
- Remove the hydraulic oil drain plug. Allow the oil to drain into a suitable container.
Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information on Containing Fluid Spillage.
- Clean the drain plug and reinstall the plug.
- Remove the hose from the hydraulic tank strainer. Inspect the hose. Replace the hose if the hose is damaged.
- Remove the hydraulic tank strainer. Inspect the strainer and clean the strainer. Replace the strainer if the strainer is worn.
- Install the strainer. Install the hose.
- Change the hydraulic oil filter. Refer to Operation and Maintenance Manual, "Hydraulic System Oil Filter (Return) - Replace".
- Fill the hydraulic system oil tank. Refer to Operation and Maintenance Manual, "Lubricant Viscosities" and Operation and Maintenance Manual, " Capacities (Refill)".
- Inspect the gasket on the hydraulic tank filler cap for damage. Replace the gasket, if necessary.
- Install the hydraulic tank filler cap.
- Start the engine and run the engine for a few minutes. Operate the control levers in order to cause the hydraulic oil to flow through the circuits.
- Maintain the hydraulic oil level between the top mark and the bottom mark on the decal next to the sight gauge, if a decal is installed. This is particularly important on early 301.6c and 301.8c models. The correct oil level is important to avoid pump cavitation. If your machine has no decal next to the sight gauge, the oil level must be visible in the sight gauge. Any position on the sight gauge is acceptable level.
Note: The oil must be free of bubbles. If bubbles are present in the oil, air is entering the hydraulic system. Inspect the suction hoses, the hose clamps and the hydraulic oil return filter.
Illustration 4 | g01167771 |
301.8C is shown. |
Illustration 5 | g01621721 |
302.5C is shown. |
- Stop the engine.
- If necessary, tighten any loose clamps and any loose connections. Replace any damaged hoses.
- Close the access door.