450E Backhoe Loader Caterpillar

Hydraulic System Oil - Change

Usage:

450E EBL

Note: The normal hydraulic oil change interval is at every 2000 Service Hours or 1 Year. By performing S·O·S oil analysis, the hydraulic oil change interval may be extended to 4000 Service Hours or 2 Years. S·O·S oil analysis must be performed at every 500 Service Hours or 3 Months in order to extend the hydraulic oil change interval. The results from the S·O·S oil analysis will determine if the hydraulic oil change interval may be extended. If S·O·S oil analysis is not available, the hydraulic oil change interval must remain at every 2000 Service Hours or 1 Year . Refer to the Operation and Maintenance Manual, "S·O·S Information".

Note: Cat HYDO Advanced 10 has a 50% increase in the standard oil drain interval for machine hydraulic systems (3000 hours versus 2000 hours) over second and third choice oils - when following the maintenance interval schedule for oil filter changes and for oil sampling that is stated in the Operation and Maintenance Manual for your particular machine. 6000 hour oil drain intervals are possible when using S·O·S Services oil analysis. Contact your Cat dealer for details.

Operate the machine for a few minutes in order to warm the hydraulic system oil.

The machine should be level . Lower the bucket to the ground and apply slight downward pressure. Engage the parking brake and stop the engine.

The hydraulic tank filler cap is located under the access door on the top of the engine compartment.

Open the engine access door on the top of the machine.
Show/hide table

Illustration 1 g01289083
Remove the hydraulic tank filler cap.
Show/hide table

Illustration 2 g01412119

Show/hide table

Illustration 3 g01412174
Open the drain valve that is located on the hydraulic pump. Allow the oil to drain into a suitable container.
Tighten the drain valve.
Change the hydraulic system filter. Refer to Operation and Maintenance Manual, "Hydraulic System Oil Filter - Change".
Inspect the hydraulic tank breather that is located in the breather hose on top of the hydraulic tank. Replace the breather, if necessary.
Fill the hydraulic system oil tank. Refer to Operation and Maintenance Manual, "Lubricant Viscosities" and Operation and Maintenance Manual, "Capacities (Refill)".
Show/hide table

Illustration 4 g01412213
Maintain the hydraulic oil level in the sight gauge between the "MIN" mark and the "MAX" mark.
Check the hydraulic oil level with the loader on the ground and with the backhoe in the transport position.
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 and hose clamps.
Inspect the gasket on the hydraulic tank filler cap for damage. Replace the gasket, if necessary.
Install the hydraulic tank filler cap.
Close the access door.