330B Excavator Hydraulic System Caterpillar

Illustration 1	g00343932
Flow meter tool layout (2) Connector At Swing Motor (3) 6V-9840 Swivel Tee (5) Main Control Valve (6) 6V-9829 Cap (7) 4C-9910 Portable Hydraulic Tester (Flow Meter) (8) Pilot line (10) Pressure Tap At Pilot Oil Manifold (11) 8T-0856 Pressure Gauge (20) 6V-3989 Unvalved Nipple (21) 6V-4143 Coupler Assembly (29) 6V-3014 Hose (30) 5K-9090 O-Ring Seal (31) 5P-0201 Hose (32) 5P-1010 Sleeve (33) 4C-8767 Coupling (34) 7M-8485 O-Ring Seal (35) 4C-6481 Coupler Assembly (36) 4C-6482 Nipple Assembly (37) 4I-6141 Coupling Assembly (38) 8C-9026 Adapter (39) 6K-6307 O-Ring Seal (42) 6V-8397 O-Ring Seal (43) 6V-8740 Union (45) 6V-8941 Reducer (46) 6V-8556 Nut (47) Swing Motor (48) Makeup line

Illustration 2	g00343972
Circuit diagram (1) Swing Motor (2) Connector (3) Tee (4) Makeup line (5) Main Control Valves (6) Cap (7) Portable Hydraulic Tester (8) Pilot Line (9) Pilot Oil Manifold (10) Pressure Tap (11) Pressure Gauge (12) Pilot Pump (13) Multitach group (14) Engine

Illustration 3	g00365393
Top of main control valves (8) Pilot line

Illustration 4	g00365355
Pilot oil manifold compartment (9) Pilot oil manifold (10) Pressure tap (15) Pilot relief valve

Illustration 5	g00344084
Portable hydraulic tester (flow meter) (7) Portable hydraulic tester (flow meter) (13) Multitach group (16) Valve (flow meter)

Preparation

Show/hide table

To prevent personal injury or equipment damage from failure of the hydraulic test equipment or associated circuit components because of blocked pump flow, make sure that the test equipment valves are fully open before starting the engine.

1. Position the machine on level ground.

2. Stop the engine.

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

4. Install the following tools in accordance with the circuit diagram. Refer to Illustration 2.

   1. Install 6000 kPa (870 psi) pressure gauge (11) at pressure tap (10) on pilot oil manifold (9) .

   2. Install multitach group (13) on engine (14) .

   3. Remove pilot line (8) from the connector that is located on top of main control valves (5). Install cap (6) on the connector.

   4. Disconnect makeup line (4) from connector (2) of swing motor (1) .

   5. Install tee (3) at connector (2) .

   6. Connect makeup line (4) to tee (3) .

   7. Install portable hydraulic tester (7) between pilot line (8) and makeup line (4) .

5. Start the engine.

6. Place the machine controls at the following settings: Power Mode, engine speed dial "10" and AEC switch OFF.

   Reference: Make reference to Testing and Adjusting, "Operational Checks" for engine rpm settings.

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

Test

1. Turn valve (16) on portable hydraulic tester (7) clockwise until pressure gauge (11) at pressure tap (10) shows a reading of 4100 ± 200 kPa (595 ± 29 psi).

2. Record the pilot pump flow at 4100 ± 200 kPa (595 ± 29 psi) in the following table.

Note: Specifications for pump flow are based on an engine speed of 1800 rpm. To get more accurate test results, measured flow should be corrected by the following calculation.

Flow measurements must be done in pressure rise.