W345B Series II Excavator Hydraulic System Relief Valve (Line) - Test and Adjust Caterpillar


Relief Valve (Line) - Test and Adjust
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1.1. Test
2.1. Adjustment (Stick Cylinder)
3.1. Adjustment (Grapple Cylinder)
4.1. Adjustment (Boom Cylinders)

Note: The main relief valve must be temporarily set before any line relief valve pressure setting is adjusted. Refer to "Temporary Setting of the Main Relief Valve" in Testing and Adjusting, "Relief Valve (Main) - Test and Adjust".

Test

  1. Position the machine on level ground.

  1. Stop the engine.

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



    Illustration 1g00694582

    Pump compartment

    (1) Pressure tap (power shift pressure)

    (2) Pressure tap (upper pump delivery pressure)

    (3) Pressure tap (lower pump delivery pressure)

  1. Connect a 6000 kPa (870 psi) pressure gauge to pressure tap (1). This is used to monitor the power shift pressure.

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

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

  1. Start the engine.



    Illustration 2g00695083

    Operator monitor panel (right console)

    (A) Controller display

    (B) Boom priority mode switch

    (C) Swing priority mode switch

    (D) Fine control mode switch

    (E) User mode switch

    (F) Power mode switch

    (G) Travel alarm cancel switch

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

    1. Depress the following three switches on the operator monitor panel at the same time: switch for fine control (D), switch for user mode (E) and travel alarm cancel switch (G). Hold all three switches down for at least three seconds.

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

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

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

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

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

    1. On the operator monitor panel, enter a fixed power shift pressure of 2950 kPa (430 psi) on the controller display (A). Adjust controller display (A) 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".

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

    1. The last four characters on the controller display (A) 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 boom priority mode switch (B). To decrease the power shift pressure 10 kPa (1.5 psi), push the swing priority mode switch (C). To increase the power shift pressure 200 kPa (29 psi), push the boom priority mode switch (B) and power mode switch (F) at the same time. To decrease the power shift pressure 200 kPa (29 psi), push the swing priority mode switch (C) and power mode switch (F) 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, "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.

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

    Note: The engine will not reach maximum no-load speed until the hydraulic tank pressure has reached the operating level.

    Reference: Refer to Testing and Adjusting, "Engine Performance - Test " for engine rpm settings.

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

  1. The pressure setting for both the head end and the rod end for each cylinder is 35300 to 38200 kPa (5120 to 5540 psi).



Illustration 3g00302303

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 head end, bucket cylinder head end and stick cylinder rod end.

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

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




Illustration 4g00707289

Line relief valve (typical example)

(10) Locknut

(11) Adjustment screw

Adjustment (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).

  1. Check the pressure in the stick cylinder rod end on the pressure gauge at pressure tap (3). The relief valve for the stick cylinder rod end is located on top of the main control valve.

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

  1. Loosen locknut (10) and turn adjustment screw (11) until the pressure gauge reading at pressure tap (3) is 35300 to 38200 kPa (5120 to 5540 psi).

  1. 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).

  1. Check the pressure in the stick cylinder head end on the pressure gauge at pressure tap (3). The relief valve for the stick cylinder head end is located on the bottom of the main control valve.

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

  1. Loosen locknut (10) and turn adjustment screw (11) until the pressure gauge reading at pressure tap (3) is 35300 to 38200 kPa (5120 to 5540 psi).

  1. After completion of line relief valve adjustment, tighten locknut (10) .

Note: Turning adjustment screw (11) clockwise increases the pressure. Turning adjustment screw (11) counterclockwise decreases the pressure.

Note: Always make final pressure adjustment on pressure rise.

Adjustment (Grapple Cylinder)

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

  1. Check the pressure in the head end of the grapple cylinder on the pressure gauge at pressure tap (2). The relief valve for the head end of the grapple cylinder is located on top of the main control valve.

  1. Return the grapple control lever to the NEUTRAL position.

  1. Loosen locknut (10) and turn adjustment screw (11) until the pressure gauge reading at pressure tap (2) is 26900 to 28275 kPa (3900 to 4100 psi).

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

  1. Check the pressure in the grapple cylinder rod end on the pressure gauge at pressure tap (2). The relief valve for the grapple cylinder rod end is located on the bottom of the main control valve.

  1. Return the grapple control lever to the NEUTRAL position.

  1. Loosen locknut (10) and turn adjustment screw (11) until the pressure gauge reading at pressure tap (2) is 26900 to 28275 kPa (3900 to 4100 psi).

  1. After completion of line relief valve adjustment, tighten locknut (10) .

Note: Turning adjustment screw (11) clockwise increases the pressure. Turning adjustment screw (11) counterclockwise decreases the pressure.

Note: Always make final pressure adjustment on pressure rise.

Adjustment (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).

  1. Check the pressure in the boom cylinder head end on the pressure gauge at pressure tap (2). The relief valve for the boom cylinder head end is located on top of the main control valve.

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

  1. Loosen locknut (10) and turn adjustment screw (11) until the pressure gauge reading at pressure tap (2) is 35300 to 38200 kPa (5120 to 5540 psi).

  1. 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).

  1. Check the pressure in the boom cylinder rod end on the pressure gauge at pressure tap (2). The relief valve for the boom cylinder rod end is located on the bottom of the main control valve.

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

  1. Loosen locknut (10) and turn adjustment screw (11) until the pressure gauge reading at pressure tap (2) is 35300 to 38200 kPa (5120 to 5540 psi).

  1. After completion of line relief valve adjustment, tighten locknut (10) .

Note: Turning adjustment screw (11) clockwise increases the pressure. Turning adjustment screw (11) counterclockwise decreases the pressure.

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.

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