FILTER NX AIR 2437384 - Caterpillar

Illustration 1 g01913453
Use the reading from upper sight gauge (2) to maintain the steering oil level. The oil level in the upper sight gauge should be within green range (A) with the engine stopped.
If necessary, remove filler cap (1) and add oil.
Do not fill the steering hydraulic tank when the engine is running. Discharge from the secondary steering accumulators could overfill the tank when the engine is stopped.
Note: When the engine is running, use the reading from lower sight gauge (3) to maintain the steering oil level. The oil level in the lower sight gauge should be within green range (B). If the oil level in the lower sight gauge is low, check the secondary steering. See Operation And Maintenance Manual, "Secondary Steering - Check" for additional information.