374D Excavator Hydraulic System Travel on Level Ground - Test - Optional Test Caterpillar

Note: When the procedure for Testing and Adjusting, "Travel on Level Ground - Test" cannot be performed, this optional test may be used as a substitute.

Note: The engine speed and/or the machine configuration that is used during this test can affect the results of this test. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for the engine speed that was used for this test. Refer to Testing and Adjusting, "Operational Checks" for the machine configurations that were used for this test.

Note: The relief valve pressure settings must be set to the relief valve pressure specification before this operational check is performed. Refer to Testing and Adjusting, "Specifications".

Illustration 1	g00297292

1. Start the engine.

2. Position the machine on level ground.
   Show/hide table

   Illustration 2	g02173555
   Monitor and keypad (A) Engine speed (B) Gain/Response (C) AEC switch (D) Gain/Response switch

3. Place the machine controls at the following settings:

   • Engine speed dial "10"

   • AEC switch OFF

   • Gain/Response "AVS" (normal mode)

4. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

5. Raise a track off the ground. Refer to Illustration 1.

6. Put a mark on a shoe of the raised track.

7. Place the travel speed control switch in HIGH position. The rabbit will be illuminated on the keypad.

8. Move the control lever of the raised track to full travel position.

9. Measure the time that is required for the raised track to make three complete revolutions. Measure the time that is required in each direction.

10. Place the travel speed control switch in the LOW position. The tortoise will be illuminated on the keypad. Repeat Steps 8 through 9.

11. Repeat this procedure for the other side track.