340F Excavator Machine Systems Caterpillar

Specification

Illustration 1	g03414609
Pressure/Flow characteristic curve

Note: Specifications for flow rates are based on an engine speed of 1700 rpm. To get more accurate test results, measured flow should be corrected with the following calculation.

Flow measurements must be done in pressure rise.

Introduction

This test measures individual pump flow at the pump while a fixed negative flow control pressure is sent to the main pump regulator. Each pump is tested individually for an output flow rate at a specified delivery pressure and a specified negative flow control pressure.

The following procedures must be completed before performing the test procedure.

Preliminary Test

• Testing and Adjusting, "Relief Valve (Pilot) - Test and Adjust"

• Testing and Adjusting, "Solenoid Valve (Proportional Reducing) - Calibrate (Power Shift Pressure)" for the machine.

• Testing and Adjusting, "Solenoid Valve (Proportional Reducing) - Calibrate (Negative Flow Control)"

Required Tools

Illustration 2	g01623868
Tooling (B) 198-4240 Digital Pressure Indicator Gp

Illustration 3	g02535237
Tooling (C) 348-5430 Multi-Tool Gp

Illustration 4	g03885562
Flow meter tool layout (1) Drive pump (2) Delivery line (drive pump) (3) Idler pump (4) Delivery line (idler pump) (5) Swing motor (6) Makeup Line (swing motor) (7) Connector at swing motor

Reference: Refer to Tool Operating Manual, NEHS1087 for operating instructions for the 348-5430 Multi-Tool Gp.

Note: Use Software License Card, NETG5049 with part number 348-5430 Multi-Tool Gp.

Machine Preparation

Illustration 5	g03885564
Pump compartment (1) Drive pump (2) Delivery line (drive pump) (3) Idler pump (4) Delivery line (idler pump) (8) Negative flow control line (drive pump) (9) Negative flow control line (idler pump) (13) Pressure tap (drive pump delivery pressure) (14) Pressure tap (delivery pressure for the idler pump) (20) Pressure tap (power shift pressure)

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. Attach 311-1362 Vacuum Cap onto the hydraulic tank. Attach an air supply hose onto the assembly. Apply 276 to 414 kPa (40 to 60 psi). This procedure will pull a vacuum on the hydraulic system.

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

   1. Disconnect delivery line (2) from drive pump (1) or line (4) from idler pump (3).

   2. Install seal (D15), half flanges (D13), and blocking cover (D16) to the end of the delivery line by using bolts (D11) and washers (D12).

   3. Assemble and install seal (D15), adapter (D14), seals (D4), fitting (D10), seal (D21), plug (D22), and nipple assembly (D5) on drive pump (1) by using half flanges (D13), bolts (D11), and washers (D12).
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      Illustration 6	g03775221
      Swing motor (top view) (5) Swing motor (6) Makeup line (7) Connector (D19) Elbow (D20) Tee

   4. Disconnect makeup line (6) from connector (7) at swing motor (7).

   5. Assemble and install seals (D18), tee (D20), swivel elbow (D19), and coupling (D17) to connector (7) at swing motor (5).

   6. Install seal (D18) and makeup line (6) to tee (D20).

   7. Connect portable hydraulic tester (D1) and the test hoses between nipple assembly (D5) at drive or idler pump (1) and coupling (D17) at swing motor (5).

   8. Connect 41368 kPa (6000 psi) pressure gauge (B2) to pressure tap (13) for drive pump delivery pressure. Connect 41368 kPa (6000 psi) pressure gauge (B2) to pressure tap (14) for idler pump delivery pressure.
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      Illustration 7	g03885563
      Pump compartment (16) Negative flow control line (idler pump) (17) Negative flow control line (drive pump) (18) Pressure tap (negative flow for idler pump) (19) Pressure tap (negative flow for drive pump)

   9. Attach a 3447 kPa (500 psi) pressure sensor to pressure tap (18) for negative flow control pressure for the idler pump. Attach a 3447 kPa (500 psi) pressure sensor to pressure tap (19) for negative flow control pressure for the drive pump.

   10. Attach a 3447 kPa (500 psi) pressure sensor to pressure tap (20) for power shift pressure.

   11. Install multi-tool group (C) on the engine to monitor engine speed.

   12. Remove 311-1362 Vacuum Cap and install the filler plug for the hydraulic tank.

Test Procedure

Note: Perform the test for the drive pump and the test for the idler pump one at a time.

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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.

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To prevent personal injury and/or equipment damage from failed lines or components while the hydraulic test equipment is returned to the open flow position, slowly open the hydraulic test equipment valve while monitoring the pump flow. If pump flow does not increase as the valve is opened, shut the engine off and determine what is preventing the pump from upstroking.

1. Start the engine.

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

3. Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF. Refer to

4. Enter the service mode.

   1. Input the password "9992".

   2. Select "Override Parameters".

5. Set the engine speed to 1700 rpm.

6. Override "Pump Flow Limit Pressure" to 2500 kPa (363 psi). Confirm the pump flow limit pressure measurement at the pressure tap (18) or (19).

7. Override power shift pressure to 2550 kPa (370 psi). Confirm the power shift pressure setting at pressure tap (20).
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   Illustration 8	g03775220
   Portable hydraulic tester (flow meter) (D1) Portable hydraulic tester (flow meter) (15) Valve

8. Turn valve (15) on portable hydraulic tester (D1) clockwise until the pump delivery pressure is 6900 kPa (1000 psi).

9. Record the negative flow rate in Table 1.