330B Excavator Hydraulic System Caterpillar

Note: A temporary setting of the main relief valve is required before travel crossover relief valves can be adjusted. Refer to Testing And Adjusting, "Pressure Specifications".

Left Travel Motor

Preparation

1. Position the machine on level ground.

2. Stop the engine.

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Illustration 1	g00363032
Pump compartment (1) Pressure tap (power shift pressure) (2) Pressure tap (upper pump delivery pressure) (3) Pressure tap (Lower pump delivery pressure)

3. Connect a 6000 kPa (870 psi) pressure gauge to pressure tap (1) .

4. Connect a 60000 kPa (8700 psi) pressure gauge to pressure tap (3) .

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Illustration 2	g00341414
Sprocket (left track) (16) Sprocket (17) Stopper

5. Place stopper (17) in sprocket (16) in order to block forward left travel. Refer to Illustration 2.

   Diameter of stopper ... 65 to 70 mm (2.56 to 2.76 inch)

6. Start the engine.

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

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

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

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Illustration 3	g00301843
Operator monitor panel (right console) (1) Controller display (2) Button for boom priority mode (3) Button for swing priority mode (4) Button for fine control mode (5) Button for user mode (6) Travel alarm cancel switch (7) Power mode switch

9. Start Service Mode and maintain power shift pressure at 2950 kPa (430 psi).

   1. Input the service code "0E 32 3A". To increase the flashing character, push the button for boom priority mode (2). To decrease the flashing character, push the button for swing priority mode (3). To move the flashing character to the right, push the button for fine control mode (4). To move the flashing character to the left, push the button for user mode (5) .

   2. Once the service code is entered into the controller display (1), depress the following three buttons on the operator monitor panel at the same time: button for fine control (4), button for user mode (5) and travel alarm cancel switch. Hold all three buttons down for at least three seconds.

   3. The controller display (1) will change to "10 -- 1".

      Note: If more than ten seconds pass between pushing the buttons, the controller display (1) will revert to the operation mode.

10. On the operator monitor panel, enter a fixed power shift pressure of 2950 kPa (430 psi) on the controller display (1). Adjust controller display (1) in order to attain a power shift pressure of 2950 kPa (430 psi) on the pressure gauge at pressure tap (1) .

    1. Move the flashing character to the far left. Increase the "1" to a "6".

    2. Move the flashing character to the right and increase the "0" to a "6".

    3. The last four characters on the controller display (1) will begin flashing. These characters represent the power shift pressure (kPa). Adjust the last four characters to "2950". To increase the power shift pressure 10 kPa (1.5 psi), push the button for boom priority mode (2). To decrease the power shift pressure 10 kPa (1.5 psi), push the button for swing priority mode (3). To increase the power shift pressure 200 kPa (29 psi), push the button for boom priority mode (2) and power mode switch (7) at the same time. To decrease the power shift pressure 200 kPa (29 psi), push the button for swing priority mode (3) and power mode switch (7) at the same time.

       Note: Always use the pressure gauge that is connected to pressure tap (1) to monitor the actual power shift pressure.

       Note: Refer to Service Manual, RENR1998, "Engine And Pump Electronic Control System" for additional information on Service Mode.

       Note: To prevent a change in power shift pressure during adjustment of travel crossover relief valves, do not turn the engine OFF.

Test and Adjust

Illustration 4	g00366640
Travel brake valve (left side) (18) Locknut (19) Adjustment screw (20) Crossover relief valve (forward left travel) (21) Crossover relief valve (reverse left travel) (22) Locknut (23) Adjustment screw

Forward Travel

1. Slowly move the left travel control lever to full FORWARD position and check the pressure gauge reading at pressure tap (3). The pressure setting of crossover relief valve (20) should be 36800 ± 1470 kPa (5350 ± 215 psi).

2. Return the left travel control lever to the NEUTRAL position.

3. In order to adjust crossover relief valve (20), loosen locknut (18) and turn adjustment screw (19) until the pressure gauge reading at pressure tap (3) is 36800 ± 1470 kPa (5350 ± 215 psi).

4. Tighten locknut (18) to a torque of 130 ± 13 N·m (95 ± 10 lb ft).

Note: Always make final pressure adjustments on pressure rise.

Reverse Travel

1. Slowly move the left travel control lever to full REVERSE position and check the pressure gauge reading at pressure tap (3). The pressure setting of crossover relief valve (21) should be 36800 ± 1470 kPa (5350 ± 215 psi).

2. Return the left travel control lever to the NEUTRAL position.

3. In order to adjust crossover relief valve (21), loosen locknut (22) and turn adjustment screw (23) until the pressure gauge reading at pressure tap (3) is 36800 ± 1470 kPa (5350 ± 215 psi).

4. Tighten locknut (22) to a torque of 130 ± 13 N·m (95 ± 10 lb ft).

Note: Always make final pressure adjustments on pressure rise.

Right Travel Motor

Connect a 60000 kPa (8700 psi) pressure gauge to pressure tap (2). Use this pressure gauge to monitor the crossover relief valve pressure setting of the right travel motor. Adjust the crossover relief valves on the right travel motor in the same manner as the adjustment for the left travel motor.

Note: After relief valve pressure adjustments, cancel Service Mode. Refer to Service Manual, RENR1998, "Engine And Pump Electronic Control System" for additional information on Service Mode.

Note: Return the main relief valve pressure to the specified setting after crossover relief valve pressure setting is attained.