330B Excavator Hydraulic System Caterpillar

Note: Adjustment procedures must be performed before a test and adjustment of any line relief valve pressure setting is attempted. A temporary setting of the main relief valve pressure is required before any line relief valve pressure setting is adjusted. Refer to the adjustment procedures in Testing And Adjusting, "Pressure Specifications".

Test

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 1	g00363032
(1) Pressure tap (power shift pressure) (2) Pressure tap (upper pump delivery pressure) (3) Pressure tap (lower pump delivery pressure)

4. Connect a 60000 kPa (8700 psi) pressure gauge to pressure tap (2). Connect a 60000 kPa (8700 psi) pressure gauge to pressure tap (3) .

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

6. Start the engine.

7. 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.

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

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Illustration 2	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. 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 (6). Hold all three buttons down for at least three seconds.

   2. The controller display (1) will be "00 00 00".

   3. 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) .

   4. 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.

   5. 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 line relief valve adjustment, do not turn the engine OFF.

11. The pressure setting for both the head end and the rod end for each cylinder is 36800 ± 1470 kPa (5350 ± 215 psi).

Illustration 3	g00369372
Main control valve (front view) (7) Line relief valve (boom cylinder rod end) (8) Line relief valve (bucket cylinder head end) (9) Line relief valve (stick cylinder head end)

The following line relief valves are located on top of the main control valve: boom cylinder rod end, bucket cylinder head end and stick cylinder head end. The line relief valve for the bucket cylinder rod end is located under the main control valves.

Illustration 4	g00369374
(10) Line relief valve (boom cylinder head end) (11) Boom drift reduction valve

The line relief valve for the boom cylinder head end (10) is located at boom drift reduction valve (11).

Illustration 5	g00369375
(12) Line relief valve (stick cylinder rod end) (13) Stick drift reduction valve

The line relief valve for the stick cylinder rod end (12) is located at stick drift reduction valve (13).

Illustration 6	g00343372
(14) Locknut (15) Adjustment screw

Illustration 7	g00343412
(16) Locknut (17) Cap

Note: Return main relief valve pressure to the specification after testing and adjusting any line relief valve. Refer to Testing And Adjusting, "Pressure Specifications" for the main relief valve pressure setting.

Note: In order to cancel Service Mode, 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 (6). Hold all three buttons down for at least three seconds. If the engine switch key is placed in the OFF position for at least 75 ± 15 seconds, Service Mode will be cancelled.

Adjust

Stick Cylinder

1. To adjust the line relief valve pressure setting of the stick cylinder rod end, move the stick control lever until the stick is at the full STICK OUT position (full retraction of stick cylinder).

2. Check the pressure in the stick cylinder rod end on the pressure gauge at pressure tap (3) .

3. Return the stick control lever to the NEUTRAL position.

4. Loosen locknut (14) or (16) on the stick line relief valve. Turn adjustment screw (15) or turn cap (17) until the pressure gauge reading at pressure tap (3) is 36800 ± 1470 kPa (5350 ± 215 psi).

5. To adjust the line relief valve pressure setting of the stick cylinder head end, move the stick control lever until the stick is at the full STICK IN position (full extension of stick cylinder).

6. Check the pressure in the stick cylinder head end on the pressure gauge at pressure tap (3) .

7. Return the stick control lever to the NEUTRAL position.

8. Loosen locknut (14) or (16) on the stick line relief valve. Turn adjustment screw (15) or turn cap (17) until the pressure gauge reading at pressure tap (3) is 36800 ± 1470 kPa (5350 ± 215 psi).

9. After completion of line relief valve adjustment, tighten locknut (14) or (16) .

Note: Turning adjustment screw (15) or turning cap (17) clockwise increases the pressure. Turning adjustment screw (15) or turning cap (17) counterclockwise decreases the pressure.

Note: Always make final pressure adjustment on pressure rise.

Bucket Cylinder

1. To adjust the line relief valve pressure setting of the bucket cylinder head end, move the bucket control lever until the bucket is at the full BUCKET CLOSE position (full extension of bucket cylinder).

2. Check the pressure in the bucket cylinder head end on the pressure gauge at pressure tap (2) .

3. Return the bucket control lever to the NEUTRAL position.

4. Loosen locknut (14) or (16) on the bucket line relief valve. Turn adjustment screw (15) or turn cap (17) until the pressure gauge reading at pressure tap (2) is 36800 ± 1470 kPa (5350 ± 215 psi).

5. To adjust the line relief valve pressure setting of the bucket cylinder rod end, move the bucket control lever until the bucket is at the full BUCKET OPEN position (full retraction of bucket cylinder).

6. Check the pressure in the bucket cylinder rod end on the pressure gauge at pressure tap (2) .

7. Return the bucket control lever to the NEUTRAL position.

8. Loosen locknut (14) or (16) on the bucket line relief valve. Turn adjustment screw (15) or turn cap (17) until the pressure gauge reading at pressure tap (2) is 36800 ± 1470 kPa (5350 ± 215 psi).

9. After completion of line relief valve adjustment, tighten locknut (14) or (16) .

Note: Turning adjustment screw (15) or turning cap (17) clockwise increases the pressure. Turning adjustment screw (15) or turning cap (17) counterclockwise decreases the pressure.

Note: Always make final pressure adjustment on pressure rise.

Boom Cylinders

1. To adjust the line relief valve pressure setting of the boom cylinder head end, move the boom control lever until the boom is at the full BOOM RAISE position (full extension of boom cylinders).

2. Check the pressure in the boom cylinder head end on the pressure gauge at pressure tap (2) .

3. Return the boom control lever to the NEUTRAL position.

4. Loosen locknut (14) or (16) on the boom line relief valve. Turn adjustment screw (15) or turn cap (17) until the pressure gauge reading at pressure tap (2) is 36800 ± 1470 kPa (5350 ± 215 psi).

5. To adjust the line relief valve pressure setting of the boom cylinder rod end, move the boom control lever until the boom is at the full BOOM DOWN position (full retraction of boom cylinders).

6. Check the pressure in the boom cylinder rod end on the pressure gauge at pressure tap (2) .

7. Return the boom control lever to the NEUTRAL position.

8. Loosen locknut (14) or (16) on the boom line relief valve. Turn adjustment screw (15) or turn cap (17) until the pressure gauge reading at pressure tap (2) is 36800 ± 1470 kPa (5350 ± 215 psi).

9. After completion of line relief valve adjustment, tighten locknut (14) or (16) .

Note: Turning adjustment screw (15) or turning cap (17) clockwise increases the pressure. Turning adjustment screw (15) or turning cap (17) counterclockwise decreases the pressure.

Note: Always make final pressure adjustment on pressure rise.

Note: If an appropriate location is not available to fully extend the boom cylinders, exchange the functions of the boom line relief valves. Remove the line relief valve for the boom cylinder head end and the line relief valve for the boom cylinder rod end from the main control valve. Exchange the location in the main relief valve of the line relief valves. Adjust the pressure of the boom line relief valve that is now attached in the head end. After completion of line relief valve adjustment, return the respective line relief valves to the original locations.