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


Relief Valve (Crossover) - Test and Adjust
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1.1. Left Travel Motor
2.2. Preparation
3.2. Test and Adjust
4.3. Forward Travel
5.3. Reverse Travel
6.1. Right Travel Motor

Note: A temporary setting of the main relief valve is required before the travel crossover relief valves can be adjusted. Refer to "Temporary Setting of the Main Relief Valve" in Testing and Adjusting, "Relief Valve (Main) - Test and Adjust".

Left Travel Motor

Preparation

  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 1g00299598

    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) .

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

  1. Set service code 92 temporarily to 40000 kPa (5800 psi) in order to prevent the machine from steering in the RABBIT (HIGH SPEED) mode.

    Note: Access to this service code requires a password. Refer to your Dealer Technical Coordinator or refer to AVSpare Service Engineering.

  1. Start the engine.

  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. Move the travel levers for counterrotation. This should cause the machine to stall.



    Illustration 2g00301843

    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

  1. Start Service Mode and maintain power shift pressure at 2940 kPa (426 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) .

    1. 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.

    1. 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.

  1. On the operator monitor panel, enter a fixed power shift pressure of 2940 kPa (426 psi) on the controller display (1). Adjust controller display (1) in order to attain a power shift pressure of 2940 kPa (426 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 (1) will begin flashing. These characters represent the power shift pressure (kPa). Adjust the last four characters to "2940". 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: 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 3g00841054

Travel control valve (left side)

(14) Crossover relief valve (forward left travel)

(15) Locknut

(16) 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). (See Illustration 1.) The pressure setting of crossover relief valve (14) should be 35300 to 38250 kPa (5120 to 5550 psi).

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

  1. In order to adjust crossover relief valve (14), loosen locknut (15) and turn adjustment screw (16) until the pressure gauge reading at pressure tap (3) is the correct pressure.

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). (See Illustration 1.) The crossover relief valve for reverse travel is located on the side of the travel control valve opposite crossover relief valve (14). The pressure setting of the crossover relief valve for reverse travel should be 35300 to 38250 kPa (5120 to 5550 psi).

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

  1. In order to adjust the crossover relief valve for reverse travel, loosen the locknut and turn the adjustment screw until the pressure gauge reading at pressure tap (3) is the correct pressure.

Note: Always make final pressure adjustments on pressure rise.

Right Travel Motor

Connect a 60000 kPa (8700 psi) pressure gauge to pressure tap (2). (See Illustration 1.) 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 you perform the relief valve pressure adjustments, cancel Service Mode.

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

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