325C Excavator Hydraulic System Gear Pump (Fan Motor) - Test Caterpillar

Illustration 1	g00817574
Flow meter tool layout (1) Swing motor (2) Connector at swing motor (3) 6V-9840 Swivel tee (4) Makeup line (swing motor) (6) 6V-9509 Face Seal Plug (7) 4C-9910 Portable hydraulic tester (flow meter) (8) Line (delivery line from the pump for the fan motor) (9) Tee at fan pump (10) Line (fan pump to relief valve) (14) Gear pump (fan motor) (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 (38) 8C-9026 Adapter (39) 6K-6307 O-Ring seal (40) 6V-9854 Swivel elbow (47) 4I-6140 Coupling (48) 8C-8762 Elbow (49) 6V-8398 O-Ring seal (50) 6V-9830 Cap As

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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".

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Illustration 2	g00818036
Circuit diagram (1) Swing motor (2) Connector (3) Tee (4) Makeup line (5) Main control valve (6) Plug (7) Portable hydraulic tester (flow meter) (8) Line (delivery line from the pump for the fan motor) (9) Tee at fan pump (10) Line (fan pump relief valve) (11) Relief valve (fan motor) (12) Engine (13) Multitach group (14) Gear pump (fan motor) (15) Fan motor (40) Elbow (50) 6V-9830 Cap As

4. Install the following tools in accordance with the flow meter tool layout and the circuit diagram. Refer to Illustration 1 and Illustration 2.

   1. Install multitach group (13) on engine (12) .

   2. Remove line (8) from tee (9) at gear pump (14) for the fan motor.

   3. Install seal (49) and plug (6) to the end of line (8) .

   4. Install seal (49) and elbow (48) to tee (9) at gear pump (14) for the fan motor.

   5. Install seal (34), coupling (47), seal (34) and nipple assembly (36) to elbow (48) .

   6. Remove line (10) from tee (9) at gear pump (14) for the fan motor.

   7. Install seal (49) and plug (6) to the end of line (10) .

   8. Install seal (49) and cap (50) to tee (9) .
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   Illustration 3	g00669270
   Swing motor (1) Swing motor (2) Connector (3) Tee (4) Makeup line (40) Elbow

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

   10. Assemble and install seals (30), tee (3), swivel elbow (40) and coupling (37) to connector (2) at swing motor (1) .

   11. Connect portable hydraulic tester (7) and test hoses between nipple assembly (36) at the pilot pump and coupling (37) at the swing motor.

5. Start the engine.

6. Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings.

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

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Illustration 4	g00344084
Portable hydraulic tester (flow meter) (7) Portable hydraulic tester (flow meter) (13) Multitach group (16) Valve (flow meter)

8. Turn valve (16) on portable hydraulic tester (7) clockwise until the pressure gauge on the portable hydraulic tester shows a reading of 11600 ± 200 kPa (1675 ± 29 psi).

9. Record the gear pump flow at 11600 ± 200 kPa (1675 ± 29 psi) in Table 1.

   Note: For high ambient specifications, repeat Steps 8 and 9 using the pressure of 14000 ± 200 kPa (2050 ± 29 psi).

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.