M318F, M320F and M322F Wheeled Excavators Hydraulic System Caterpillar

Specification

Introduction

Performing the following test procedures will help to determine if the service brake is functioning correctly.

Brake System Pressure - Check

The following information outlines the necessary steps to check the service brake pressure using the operator monitor.

An initial test should be conducted after 500 hours of use. This test should be repeated every 2000 hours after.

1. Clear all personnel from the machine and from the area around the machine.

2. Start the engine.

3. Set the engine speed dial at "10".

4. Lower the left console.

5. Position the machine on level ground. Check the visibility and adjust the mirrors for the best vision close to the machine.

6. Increase the hydraulic oil temperature to 46 to 80° C (115 to 176° F).

7. Fully extend the bucket cylinder and place the bucket on the ground.

8. Use the monitor in the cab to disable the "Auto Service Brake".
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   Illustration 1	g03743048

   1. Press the "Menu" key to display the main menu options.
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      Illustration 2	g03743052

   2. Use the arrows to select "Performance" mode from the "Main Menu". Press the "OK" key.
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      Illustration 3	g03743053

   3. Use the arrows to select "Brake Settings" mode from the "Performance" menu. Press the "OK" key.
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      Illustration 4	g03739612

   4. Use the arrows to select "Auto Service Brake" mode from the "Brake Settings" menu.

   5. Use the arrow to "Disable" the "Auto Service Brake". Press"OK" when done.

      Note: When the auto service brake is enabled , the standard service brake pressure cannot be adjusted higher than the auto service brake pressure.

9. Enter the service menu in the operator monitor and go to 'Analog Input Status' and scroll down to display 'Service Brake Pressure'.

10. Set the engine speed dial at 1.

11. Fully press brake pedal into Locked position. Pedal must remain in the Locked position while the reading is taken.

    1. Take a reading of the 'Service Brake Pressure' shown in the display while the brake pedal is in the Locked position.

    2. Release the brake pedal.

12. Repeat step 11 twice to collect three readings total.

13. If the value of the lowest reading is below 7000 kPa (1015 psi), refer to "Active Service Brake Pressure".

Active Service Brake Pressure

Required Tools

Illustration 5	g01623868
Tooling (B) 198-4240 Digital Pressure Indicator Gp

Machine Preparation

1. Clear all personnel from the machine and from the area around the machine.

2. Start the engine.
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   Illustration 6	g02449876
   Engine speed dial

3. Set the engine speed dial at "10".

4. Lower the left console.

5. Position the machine on level ground. Check the visibility and adjust the mirrors for the best vision close to the machine.

6. Increase the hydraulic oil temperature to 46° to 60° C (115° to 140° F).

7. Fully extend the bucket cylinder and place the bucket on the ground.

8. Stop the engine.

9. Release the pressure in the hydraulic system.

   Note: Refer to Testing and Adjusting, "System Pressure - Release".

10. Raise the left console.
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    Illustration 7	g03739542
    View of the brake control valve which is located under the cab (typical example) (1) Locknut (2) Rod adjuster (3) Brake control valve (4) Pressure tap (brake)

11. Attach Tooling (B2) 34,450 kPa (5,000 psi) pressure sensor to pressure tap (4) at port "BR2".

12. Perform the "Test Procedure" .

Test Procedure

1. Clear all personnel from the machine and from the area around the machine.

2. Start the engine.
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   Illustration 8	g02452604
   Engine speed dial

3. Set the engine speed dial at "1".

4. Lower the left console.
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   Illustration 9	g02418817
   Parking brake button located on the soft panel switch

5. Push down on the parking brake button to deactivate the parking brake.

   Note: The indicator light will be not illuminated when the parking brake control is deactivated.

6. Use the monitor in the cab to disable the "Auto Service Brake".
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   Illustration 10	g03743048

   1. Press the "Menu" key to display the main menu options.
      Show/hide table

      Illustration 11	g03743052

   2. Use the arrows to select "Performance" mode from the "Main Menu". Press the "OK" key.
      Show/hide table

      Illustration 12	g03743053

   3. Use the arrows to select "Brake Settings" mode from the "Performance" menu. Press the "OK" key.
      Show/hide table

      Illustration 13	g03739612

   4. Use the arrows to select "Auto Service Brake" mode from the "Brake Settings" menu.

   5. Use the arrow to "Disable" the "Auto Service Brake". Press"OK" when done.

      Note: When the auto service brake is enabled , the standard service brake pressure cannot be adjusted higher than the auto service brake pressure.

7. Fully depress the service brake pedal until the service brake pedal locks mechanically.

8. Check the active brake pressure at pressure tap (4). Refer to Table 1 for the correct pressure.

9. If the active brake pressure is not set to the proper specifications, perform the "Adjustment Procedure".

Adjustment Procedure

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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.

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Illustration 14	g03739542
View of the brake control valve which is located under the cab (typical example) (1) Locknut (2) Rod adjuster (3) Brake control valve (4) Pressure tap (brake)

1. Loosen locknut (1) on rod adjuster (2).

   Note: Adjusting the rod is easier, if the service brake pedal has been released.

2. Turn rod adjuster (2) until the active service brake pressure has been met. Refer to Table 1 for the correct pressure.

3. While rod adjuster (2) is being held, tighten locknut (1) to the specified torque.

4. Proceed to the "Test Procedure".

Auto Service Brake Check

1. Use the monitor in the cab to enable the "Auto Service Brake".
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   Illustration 15	g03722433

   1. Press the "Menu" key to display the main menu options.
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      Illustration 16	g03722870

   2. Use the arrows to select "Performance" mode from the "Main Menu". Press the "OK" key.
      Show/hide table

      Illustration 17	g03739605

   3. Use the arrows to select "Brake Settings" mode from the "Performance" menu. Press the "OK" key.
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      Illustration 18	g03739762

   4. Use the arrows to select "Auto Service Brake" mode from the "Brake Settings" menu.

   5. Use the arrow to "Enable" the "Auto Service Brake". Press"OK" when done.
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   Illustration 19	g02418817
   Parking brake button located on the soft panel switch

2. Push down on the parking brake button to deactivate the parking brake.

   Note: The indicator light will be not illuminated when the parking brake control is deactivated.

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   Illustration 20	g02453444
   Transmission control button located on the soft panel switch

3. Push down on the transmission control button to select FIRST GEAR.

   Note: The first indicator light will illuminate when the transmission is in FIRST GEAR.

4. Check the active auto brake pressure at pressure tap (4). Refer to Table 1 for the correct pressure.

5. Proceed to the "Test Procedure".

Inactive Service Brake Pressure

Test Procedure

Note: The Active Service "Test Procedure" must be performed before Inactive Service "Test Procedure".

1. Release the service brake.

2. Stop the engine.

3. Raise the left console.

4. Disconnect tooling (B2) 34,450 kPa (5,000 psi) pressure gauge from pressure tap (4).

5. Connect tooling (B2) 3,445 kPa (500 psi) pressure gauge to pressure tap (4).
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   Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.

6. Start the engine, but do not depress the service brake pedal.

7. Use the monitor in the cab to disable the "Auto Service Brake".

8. Check the inactive brake pressure at pressure tap (4). Refer to Table 1 for the correct pressure.

9. If the inactive brake residual pressure exceeds specifications, perform the "Adjustment Procedure".

Adjustment Procedure

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Illustration 21	g03739544
Service brake pedal (5) Stop screw (6) Locknut

1. Loosen locknut (6) on stop screw (5).

2. Turn stop screw (5) clockwise until the active service brake pressure has been met. Refer to Table 1 for the correct pressure.

3. While stop screw (5) is being held, tighten locknut (6) to the specified torque.

4. Repeat Step 6 through Step 9 of the "Test Procedure" until the inactive service brake pressure has been met.