322C 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	g00667454
Swing motor compartment (1) Case drain hose (2) Tee

3. Disconnect the case drain hose (1) from tee (2) . Place the open end of the case drain hose (1) into the container for measuring.

4. Install 6V-8398 O-Ring Seal and 6V-9830 Cap on tee (2) of the swivel.

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Illustration 2	g00667455
Pilot manifold (3) Connector (4) Solenoid valve for swing parking brake

5. Disconnect connector (3) from the solenoid valve for swing parking brake (4) .

6. Start the engine.

7. Place the engine speed dial at position "10" and AEC switch OFF. Maintain the maximum no-load speed at 1870 ± 50 rpm.

   ReferenceRefer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings.

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

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

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

11. Stop the engine.

12. Connect connector (3) to the solenoid valve for swing parking brake (4) .

13. 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 ... 30 L/min (7.9 US gpm)

Rebuilt swing motor ... 35 L/min (9.2 US gpm)