314C CR Excavator Hydraulic System Caterpillar

1. Stop the engine.

2. Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release".
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   Illustration 1	g00862459
   (1) Drain line (2) Tee

3. Disconnect drain line (1) from the swivel. Place the open end of the drain line (1) into the container for measuring.

4. Install 6V-8398 O-Ring Seal and 6V-9830 Cap As to tee (2) at the swivel.
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   Illustration 2	g00861194
   (3) Drain line (4) Pilot line

5. Perform the following steps in order to engage the swing parking brake.

   1. Disconnect pilot line (4) from elbow (3).

   2. Install 6V-8397 O-Ring Seal and 6V-9829 Cap As to elbow (3).

   3. Leave the end of pilot line (4) open to the atmosphere.

6. Start the engine.

7. Place the machine controls at the following settings: engine speed dial "10" and Low idle switch OFF. Refer to Testing and Adjusting, "Engine Performance - Test" for engine rpm settings.

8. Place the hydraulic activation control lever in the UNLOCKED position.

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

10. Slowly move the swing joystick and make sure that the swing parking brake is activated.

11. Move the swing joystick fully for one minute. Measure the case drain oil.

12. Stop the engine.

13. Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "Hydraulic System Pressure - Release".

14. Remove the cap from connector (2) at the main control valve. Connect pilot line (4) to elbow (3) in order to disengage the swing parking brake.

15. Repeat this test procedure three times in order to obtain three measurements. For each test procedure, swing the upper structure to a different position.

The following values specify the maximum acceptable flow of case drain oil when the swing relief pressure is set at 24500 ± 980 kPa (3550 ± 140 psi).

New swing motor ... 15 L/min (4.0 US gpm)

Rebuilt swing motor ... 17 L/min (4.5 US gpm)