330D, 336D and 340D Excavators Hydraulic System – Overload Warning – Set – If Equipped

The overload warning device is a system that warns the operator that the pump pressure for the boom cylinder lines has exceeded a set value. The set value for the overload warning device varies because of the machine configuration and the attachments that are installed. The alarm setting for the overload warning device on your machine should be checked for the proper adjustment. Use the information that follows in order to calculate the correct value and reset the parameter for the overload warning device.

Note: The engine speed and/or the machine configuration that is used during this test can affect the results of this test. Refer to Testing and Adjusting, “Engine Performance – Test (Engine Speed)” for the engine speed that was used for this test.

Note: The relief valve pressure settings must be set to the relief valve pressure specification before performing this operational check. Refer to Testing and Adjusting, “Specifications”.

Calculation Of The Threshold Pressure For The Overload Warning Device

Use the information that follows in order to calculate the correct value of the threshold pressure for the overload warning device on your machine.




Illustration 1 g01344310

Basic position of the machine

(A) Full extension of bucket cylinder

(B) Full retraction of stick cylinder

(C) Position of the pin in the boom foot

(D) Position of the track

(E) Secured position of the bucket

(F) Position of the pin in the stick nose

  1. Position the machine. Refer to Illustration 1.
  1. Stop the engine.
  1. Connect the linkage and a stationary object with a suitable lifting device (E) . Make sure that the pin in stick nose (F) is the same distance from the ground as the pin for the boom foot (C) .

    Note: Make sure that the boom is positioned perpendicular to the track. The machine should be configured with the boom, the stick, and the attachments that will be used.

  1. Start the engine.
  1. Place the machine controls at the following settings: engine speed dial “10” and AEC switch OFF. Refer to Testing and Adjusting, “Engine Performance – Test (Engine Speed)” for engine rpm settings.
  1. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
  1. Access the “PERFORMANCE” menu with the monitor in order to measure the pump pressure during boom operation. The “PERFORMANCE” menu allows the user to view data for a list of system parameters. The data allows the user to monitor machine systems during machine operation. Use Illustration 2 in order to navigate the monitor.



    Illustration 2 g01197980

    (1) Up key

    (2) Right key

    (3) Home key

    (4) Main menu key

    (5) Left key

    (6) Down key

    (7) Cancel key or back key

    (8) OK key

  1. From the default screen, press the main menu key (4) .



    Illustration 3 g01358203

    Typical example of the “MAIN MENU” for the monitor

  1. The “PERFORMANCE” menu option is entered by selecting “PERFORMANCE” from the “MAIN MENU”. Press the left key (5) or the right key (2) until “PERFORMANCE” is highlighted in order to select this option. Then press the OK key (8) . Refer to Illustration 3.



    Illustration 4 g01358206

    Typical example of the “PERFORMANCE” menu for the monitor

  1. From the “PERFORMANCE” menu, use the appropriate up key (1) or down key (6) to scroll through the listed parameters for the system components. Find the parameter for the pump pressure.



    Illustration 5 g01344314

    Position of the machine for the measurement of the pump pressure

    (G) Extension of boom cylinder

    (H) Track at the rear or the machine

    (J) Free space between the track and the ground

  1. Slowly extend the boom cylinders. Extend the boom cylinders until the track that is under the rear side of the machine is above the ground. Refer to Illustration 5.
  1. Record the measured pump pressure from the display on the monitor in the cab in Table 1.
  1. Slowly retract the boom cylinder. Retract the boom cylinder until the track that is under the rear side of the machine is on the ground.
  1. The value of the threshold pressure for the overload warning device is 70% of the recorded pump pressure from Step 12. This calculation is shown in Table 1.

    Table 1
    Calculation for Overload Warning Device (OLWD)    
    Pump Pressure (PP)        
    OLWD Pressure = PP x 0.7        

Input The Value Of The Threshold Pressure For The Overload Warning Device




    Illustration 6 g01197980

    (1) Up key

    (2) Right key

    (3) Home key

    (4) Main menu key

    (5) Left key

    (6) Down key

    (7) Cancel key or back key

    (8) OK key

  1. In order to access the “OVER LOAD WARNING” parameter, you must first enter the “SERVICE” mode on the monitor.
  1. Use the following procedure to access the “SERVICE” screen on the monitor.
    1. From the default screen, press the main menu key (4) .
    1. From the “MAIN MENU” screen, use the right key (2) to scroll through the menu options.



      Illustration 7 g01358401

    1. When the “SERVICE” option is highlighted, press the OK key (8) .



      Illustration 8 g01358403

    1. When “PASSWORD” screen appears, use the right key (2) and the left key (5) in order to scroll through the characters. When the desired character is highlighted, press the OK key (8) . Enter the password for service FFF2 in order to continue to the “SERVICE” screen.
    1. After the password has been entered the “SERVICE” screen should appear. Refer to Illustration 9.



    Illustration 9 g01358334

    Typical example of the “SERVICE” menu for the monitor

  1. From the “SERVICE” menu, use the up key (1) or the down key (6) in order to move the highlighted line.
  1. When the “CONFIGURATIONS” menu option is highlighted, press the OK key (8) .



    Illustration 10 g01358336

    Typical example of the “CONFIGURATIONS” screen

  1. After the OK key (8) is pressed the “CONFIGURATIONS” screen will appear. From the “CONFIGURATIONS” menu, highlight “PARAMETER SETTING”.
  1. When the “PARAMETER SETTING” option is highlighted, press the OK key (8) .