M322C Excavator Hydraulic System Caterpillar

Utilize this procedure in order to set up the combined function valve. The following values are set with this procedure:

• One-way flow or Two-way flow

• Maximum flow

• Maximum pressure

Values for five work tools can be entered. Procedures are included for utilizing the monitor and for utilizing ET. Utilizing ET is the more precise procedure for setting the flow.

Table 1

Required Tools
Part Number	Part Description	Qty
6V-3014	Hose	1
6V-3989	Unvalved Nipple	1
6V-4143	Coupler Assembly	2
8T-0861	Pressure Gauge	1
	IBM-COMPATIBLE personal computer with an installed current version of Caterpillar Electronic Technician software (1)	1
171-4400	Communication Adapter Gp	1

( 1 )

Refer to Special Publication, JEBD3003, "ET Software CD and Getting Started Book". Instructions for the use of Electronic Technician software are included in the software.

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NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

Note: In order to perform this procedure, the requirements for flow and pressure for the work tool will be needed. Obtain the correct flow and pressure from the manufacturer of the tool.

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Illustration 1	g00878241
Flow meter tool layout (1) Left attachment valve (2) Left line to portable hydraulic tester (3) Right attachment valve (4) Right line to portable hydraulic tester (5) Portable hydraulic tester (6) Valve

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Illustration 2	g00851657
(1) Left attachment valve (2) Left line to portable hydraulic tester

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Illustration 3	g00851660
(3) Right attachment valve (4) Right line to portable hydraulic tester

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Illustration 4	g00851984
Flow meter tool layout (1) Left attachment valve (3) Right attachment valve (5) Portable hydraulic tester (6) Valve (7) 6K-6307 O-Ring seal (8) 8C-9026 Adapter (9) 7M-8484 O-Ring seal (10) 4C-6482 Nipple assembly (11) 4C-6481 Coupler assembly (12) 7M-8484 O-Ring seal (13) 4C-8767 Coupling (14) 5P-1010 Sleeve (15) 5P-0201 Hose (16) 8T-4196 Bolt (17) 8T-4121 Hard Washer (18) 8C-3206 Half Flange (19) 9U-7444 Flange (20) 4J-0520 O-Ring Seal

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To prevent personal injury or equipment damage from failure of the hydraulic test equipment or associated circuit components because of blocked pump flow, make sure that the test equipment valves are fully open before starting the engine.

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To prevent personal injury and/or equipment damage from failed lines or components while the hydraulic test equipment is returned to the open flow position, slowly open the hydraulic test equipment valve while monitoring the pump flow. If pump flow does not increase as the valve is opened, shut the engine off and determine what is preventing the pump from upstroking.

1. Install the flow meter and fittings.

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Illustration 5	g00917543
The pressure tap is located behind the left rear access door. (21) Load sensing signal pressure

2. Install a 60000 kPa (8700 psi) pressure gauge on tap (21) .

3. Start the engine.

4. Lower the left console.

Electronic Technician Procedure

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Illustration 6	g00917544
Right side of cab seat (22) Service connector

1. Connect a laptop computer to service connector (22) .

2. Start Electronic Technician.

3. Select the Machine ECM.

4. Select "OK".

5. Select "Service" from the main menu.

6. Select "Tool Configuration".

7. Select the desired tool.

8. Select the "Activate" button.

9. Select the "Configure" button.

10. Select "One Way/Two Way".

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Illustration 7	g00918429
ET Tool Configuration Screen

11. Select the "Change" button.

12. Select "One Way" or "Two Way" from the menu.

    Note: A typical "One Way" tool is a hammer or a compactor. A typical "Two Way" tool is a shear or a grapple.

13. Select "OK".

14. Select "Yes".

    Note: For "One Way" tools, only set the "Back Direction" for flow and pressure. Do nothing with the "Front Direction".

    Note: Select "Tool Program Name" in order to give the work tool a name.

One-Way Flow

Note: Make sure that "One-way" flow is selected.

Note: Use the flow adjustment procedure before the pressure adjustment procedure.

Flow Adjustment

Note: The maximum pressure for the back direction must be set to 100% before the flow can be set.

1. Select "Attachment Pedal Back Direction Max Pressure Command".

2. Select the "Change" button.

3. Enter a value of 100.

   Note: When the "Attachment Pedal Back Direction Max Pressure Command" is changed, the maximum pressure to the attachment will change.

   Note: The value is not an actual pressure. The value is a percent of the current that is being sent to the solenoid valve for pressure control.

Note: When ET is used, the flow parameter can be entered in increments of one tenth of a percent.

Note: The direction of oil flow is controlled by the attachment pedal. The pedal back direction supplies oil to the left tool control line. The pedal forward direction supplies oil to the right tool control line.

4. Open valves (1) and (3) .

5. Select "Attachment Pedal Back Direction Max Flow Command".

6. Select the "Change" button.

7. Enter a value from 0 to 100. Start with a value of 50.

   Note: When the "Attachment Pedal Back Direction Max Flow Command" is changed, the maximum flow to the attachment will change.

   Note: The value is not an actual flow rate. The value is a percent of the current that is being sent to the flow control solenoid valve.

8. Select "OK".

9. Select "Yes".

10. Place the engine speed dial in position 10. Also place the operating mode of the machine into the travel mode.

11. Press the attachment pedal in the back direction.

12. Slowly turn valve (6) on the hydraulic tester and use the pressure gauge on the hydraulic tester to adjust the pressure to the operating pressure for the tool. Check the flow rate on the hydraulic tester.

13. Repeat step 6 through step 12 until the desired flow at the operating pressure is reached.

Pressure Adjustment

Note: Step 1 is only required if the maximum pressure of the work tool is greater than the load sensing signal limiter pressure. Refer to Testing and Adjusting, "Specifications" for the correct load sensing signal limiter pressure.

1. Turn the adjustment screw on the load sensing signal limiter valve in the clockwise direction until the screw contacts the stop. Refer to Testing and Adjusting, "Relief Valve (Signal Limiter) - Test and Adjust".

2. Close valve (1) and (3) .

3. Place the engine speed dial in position 10. Also place the operating mode of the machine into the travel mode.

4. Select "Attachment Pedal Back Direction Max Pressure Command".

5. Select the "Change" button.

6. Enter a value from 0 to 100. Start with a value of 50.

   Note: When the "Attachment Pedal Back Direction Max Pressure Command" is changed, the maximum pressure to the attachment will change.

   Note: The value is not an actual pressure. The value is a percent of the current that is being sent to the solenoid valve for pressure control.

7. Select "OK".

8. Select "Yes".

9. Press the attachment pedal in the back direction.

10. Read the pressure on the gauge at tap (21) .

11. Repeat step 4 through step 10 until the desired pressure is reached.

    Note: Always make the final pressure adjustment on the pressure rise.

12. Return the load sensing signal limiter valve to the original setting. Refer to Testing and Adjusting, "Relief Valve (Signal Limiter) - Test and Adjust".

Two-Way Flow

Note: Make sure that "Two-way" flow has been selected.

Note: Use the flow adjustment procedure first and then use the pressure adjustment procedure.

Flow Adjustment

Note: The maximum pressure in both directions must be set to 100% before the flow can be set.

1. Select "Attachment Pedal Back Direction Max Pressure Command".

2. Select the "Change" button.

3. Enter a value of 100.

4. Select "Attachment Pedal Forward Direction Max Pressure Command".

5. Select the "Change" button.

6. Enter a value of 100.

   Note: When the "Attachment Pedal Back Direction Max Pressure Command" is changed, the maximum pressure to the attachment will change.

   Note: The value is not an actual pressure. The value is a percent of the current that is being sent to the solenoid valve for pressure control.

Note: When ET is used, the flow parameter can be entered in increments of one tenth of a percent.

Note: The direction of oil flow is controlled by the attachment pedal. The pedal back direction supplies oil to the left tool control line. The pedal forward direction supplies oil to the right tool control line.

7. Open valves (1) and (3) .

8. Select "Attachment Pedal Back Direction Max Flow Command".

9. Select the "Change" button.

10. Enter a value from 0 to 100. Start with a value of 50.

    Note: When the "Attachment Pedal Back Direction Max Flow Command" is changed, the maximum flow to the attachment will change.

    Note: The value is not an actual flow rate. The value is a percent of the current that is being sent to the flow control solenoid valve.

11. Select "OK".

12. Select "Yes".

13. Place the engine speed dial in position 10. Also place the operating mode of the machine into the travel mode.

14. Press the attachment pedal in the back direction.

15. Slowly turn valve (6) on the hydraulic tester and use the pressure gauge on the hydraulic tester to adjust the pressure to the operating pressure for the tool. Check the flow rate on the hydraulic tester.

16. Repeat step 6 through step 12 until the desired flow at the operating pressure is reached.

17. Close valve (1) and valve (3). Reverse line (2) and line (4) to the portable hydraulic tester.

18. Open valve (1) and valve (3) .

19. Select "Attachment Pedal Forward Direction Max Flow Command".

20. Select the "Change" button.

21. Enter a value from 0 to 100. Start with a value of 50.

    Note: When the "Attachment Pedal Front Direction Max Flow Command" is changed, the maximum flow to the attachment will change.

    Note: The value is not an actual flow rate. The value is a percent of the current that is being sent to the flow control solenoid valve.

22. Select "OK".

23. Select "Yes".

24. Press the attachment pedal in the forward direction.

25. Slowly turn valve (6) on the hydraulic tester and use the pressure gauge on the hydraulic tester to adjust the pressure to the operating pressure for the tool. Check the flow rate on the hydraulic tester.

26. Repeat step 20 through step 25 until the desired flow at the operating pressure is reached.

Pressure Adjustment

Note: Step 1 is only required if the maximum pressure of the work tool is greater than the load sensing signal limiter pressure. Refer to Testing and Adjusting, "Specifications" for the correct load sensing signal limiter pressure.

1. Turn the adjustment screw on the load sensing signal limiter valve in the clockwise direction until the screw contacts the stop. Refer to Testing and Adjusting, "Relief Valve (Signal Limiter) - Test and Adjust".

2. Close valve (1) and (3) .

3. Select "Attachment Pedal Back Direction Max Pressure Command".

4. Select the "Change" button.

5. Enter a value from 0 to 100. Start with a value of 50.

   Note: When the "Attachment Pedal Back Direction Max Pressure Command" is changed, the maximum pressure to the attachment will change.

   Note: The value is not an actual pressure. The value is a percent of the current that is being sent to the solenoid valve for pressure control.

6. Select "OK".

7. Select "Yes".

8. Place the engine speed dial in position 10. Also place the operating mode of the machine into the travel mode.

9. Press the attachment pedal in the back direction.

10. Read the pressure on the gauge at tap (21) .

11. Repeat step 3 through step 10 until the desired pressure is reached.

    Note: Always make the final pressure adjustment on the pressure rise.

12. Select "Attachment Pedal Forward Direction Max Pressure Command".

13. Select the "Change" button.

14. Enter a value from 0 to 100. Start with a value of 50.

    Note: When the "Attachment Pedal Forward Direction Max Pressure Command" is changed, the maximum pressure to the attachment will change.

    Note: The value is not an actual pressure. The value is a percent of the current that is being sent to the solenoid valve for pressure control.

15. Select "OK".

16. Select "Yes".

17. Press the attachment pedal in the forward direction.

18. Read the pressure on the gauge at tap (21) .

19. Repeat step 12 through step 18 until the desired pressure is reached.

    Note: Always make the final pressure adjustment on the pressure rise.

20. Return the load sensing signal limiter valve to the original setting. Refer to Testing and Adjusting, "Relief Valve (Signal Limiter) - Test and Adjust".

Monitor Adjustment Procedures

This section outlines the procedures for adjusting a tool by utilizing the monitor. Refer to the "Monitor Reference Section" for the instructions for each of the monitor screens.,

One-Way Flow

Note: Use the flow adjustment procedure first and then use the pressure adjustment procedure.

Flow Adjustment

1. Place the engine start switch in the ON position. Do not start the engine.

2. Enable "Service Options PW" menu.

   Note: The "Service Option PW" menu is enabled until the engine start switch has been turned off for 2 minutes.

3. Start the engine.

4. Press the Menu key.

5. Select "Service Options PW".

6. Select "Tool Adjustment".

7. Press the OK key.

8. Use the left or the right arrow to select a tool.

   Note: Change the name of the tool, if necessary.

9. Press the OK key.

10. Use the left and the right arrows to select "One/Two-way " parameter.

11. Select the "One-way" parameter.

12. Press the set key.

13. Scroll to "Back Dir Max Press %".

14. Use the up arrow and the down arrow to change the value to 100%.

15. Press the set key.

16. Scroll to "Back Dir Max Flow %".

17. Use the up arrow and the down arrow to enter a value from 0 to 100. Start with a value of 50.

18. Press the set key.

    Note: When the "Attachment Pedal Back Direction Max Pressure Command" is changed, the maximum pressure to the attachment will change.

    Note: The value is not an actual pressure. The value is a percent of the current that is being sent to the solenoid valve for pressure control.

    Note: Flow percentages are entered as whole numbers, when the monitor is used.

19. Open valves (1) and (3) .

20. Place the engine speed dial in position 10. Also place the operating mode of the machine into the travel mode.

21. Press the attachment pedal in the back direction.

22. Slowly turn valve (6) on the hydraulic tester and use the pressure gauge on the hydraulic tester to adjust the pressure to the operating pressure for the tool. Check the flow rate on the hydraulic tester.

23. Repeat step 17 through step 22 until the desired flow at the operating pressure is reached.

Pressure Adjustment

Note: Step 1 is only required if the maximum pressure of the work tool is greater than the load sensing signal limiter pressure. Refer to Testing and Adjusting, "Specifications" for the correct load sensing signal limiter pressure.

1. Turn the adjustment screw on the load sensing signal limiter valve in the clockwise direction until the screw contacts the stop. Refer to Testing and Adjusting, "Relief Valve (Signal Limiter) - Test and Adjust".

2. Place the engine start switch in the ON position. Do not start the engine.

3. Enable "Service Options PW" menu.

   Note: The "Service Option PW" menu is enabled until the engine start switch has been turned off for 2 minutes.

4. Close valve (1) and (3) .

5. Start the engine.

6. Press the "Menu" key.

7. Select "Service Options PW".

8. Select "Tool Adjustment".

9. Press the OK key.

10. Use the left or the right arrow key to select a tool.

    Note: Change the name of the tool, if necessary.

11. Press the OK key.

12. Use the up arrow and the down arrow to select "One/Two-way" parameter.

13. Press the Set key.

14. Scroll to "Back Dir Max Press %".

15. Use the up arrow and the down arrow to enter a value from 0 to 100. Start with a value of 50.

    Note: When the "Back Dir Max Press %" parameter is changed, the maximum pressure to the attachment will change.

    Note: The value is not an actual pressure. The value is a percent of the current that is being sent to the solenoid valve for pressure control.

16. Press the Set key.

17. Place the engine speed dial in position 10. Also place the operating mode of the machine into the travel mode.

18. Press the attachment pedal in the back direction.

19. Read the pressure on the gauge at tap (21) .

20. Repeat step 15 through step 20 until the desired pressure is reached.

    Note: Always make the final pressure adjustment on the pressure rise.

21. Return the load sensing signal limiter valve to the original setting. Refer to Testing and Adjusting, "Relief Valve (Signal Limiter) - Test and Adjust".

Two-Way Flow

Note: Use the flow adjustment procedure first and then use the pressure adjustment procedure.

Flow Adjustment

1. Place the engine start switch in the ON position. Do not start the engine.

2. Enable "Service Options PW" menu.

   Note: The "Service Option PW" menu is enabled until the engine start switch has been turned off for 2 minutes.

3. Start the engine.

4. Press the "Menu" key.

5. Select "Service Options PW".

6. Select "Tool Adjustment".

7. Press the OK key.

8. Use the left or the right arrow to select a tool.

   Note: Change the name of the tool, if necessary.

9. Press the OK key.

10. Use the up arrow and the down arrow to select "Two-way Flow".

11. Press the set key.

Note: The maximum pressure in both directions must be set to 100% before the flow can be set.

12. Scroll to "Back Dir Max Press %".

13. Use the up arrow and the down arrow to change the value to 100%.

14. Press the set key.

15. Scroll to "Forward Dir Max Press %".

16. Use the up arrow and the down arrow to change the value to 100%.

17. Press the set key.

    Note: When the "Back Dir Max Press %" is changed, the maximum pressure to the attachment will change. When the "Front Dir Max Press %" is changed, the maximum pressure to the attachment will change.

    Note: The value is not an actual pressure. The value is a percent of the current that is being sent to the solenoid valve for pressure control.

    Note: Flow percentages are entered as whole numbers when the monitor is used.

    Note: The direction of oil flow is controlled by the attachment pedal. The pedal back direction supplies oil to the left tool control line. The pedal forward direction supplies oil to the right tool control line.

18. Open valves (1) and (3) .

19. Scroll to "Back Dir Max Flow %".

20. Use the up arrow and the down arrow to enter a value from 0 to 100. Start with a value of 50.

21. Press the set key.

22. Place the engine speed dial in position 10. Also place the operating mode of the machine into the travel mode.

23. Press the attachment pedal in the back direction.

24. Slowly turn valve (6) on the hydraulic tester and use the pressure gauge on the hydraulic tester to adjust the pressure to the operating pressure for the tool. Check the flow rate on the hydraulic tester.

25. Repeat step 20 through step 24 until the desired flow at the operating pressure is reached.

26. Close valve (1) and valve (3). Reverse line (2) and line (4) to the portable hydraulic tester.

27. Open valve (1) and valve (3) .

28. Scroll to "Forward Dir Max Flow %".

29. Use the up arrow and the down arrow to enter a value from 0 to 100. Start with a value of 50.

30. Press the set key.

31. Place the engine speed dial in position 10. Also place the operating mode of the machine into the travel mode.

32. Press the attachment pedal in the forward direction.

33. Slowly turn valve (6) on the hydraulic tester and use the pressure gauge on the hydraulic tester to adjust the pressure to the operating pressure for the tool. Check the flow rate on the hydraulic tester.

34. Repeat step 29 through step 33 until the desired flow at the operating pressure is reached.

Pressure Adjustment

Note: Step 1 is only required if the maximum pressure of the work tool is greater than the load sensing signal limiter pressure. Refer to Testing and Adjusting, "Specifications" for the correct load sensing signal limiter pressure.

1. Turn the adjustment screw on the load sensing signal limiter valve in the clockwise direction until the screw contacts the stop. Refer to Testing and Adjusting, "Relief Valve (Signal Limiter) - Test and Adjust".

2. Place the engine start switch in the ON position. Do not start the engine.

3. Enable "Service Options PW" menu.

   Note: The "Service Option PW" menu is enabled until the engine start switch has been turned off for 2 minutes.

4. Close valve (1) and (3) .

5. Start the engine.

6. Press the "Menu" key.

7. Select "Service Options PW".

8. Select "Tool Adjustment".

9. Press the OK key.

10. Use the left or the right arrow to select a tool.

    Note: Change the name of the tool, if necessary.

11. Press the OK key.

12. Use the up arrow and the down arrow to select "One/Two-way" parameter.

13. Select the "Two-way" parameter.

14. Press the Set key.

15. Scroll to "Back Dir Max Press %".

16. Use the up arrow and the down arrow to enter a value from 0 to 100. Start with a value of 50.

    Note: When the "Back Dir Max Press %" is changed, the maximum pressure to the attachment will change.

    Note: The value is not an actual pressure. The value is a percent of the current that is being sent to the solenoid valve for pressure control.

17. Press the Set key.

18. Place the engine speed dial in position 10. Also place the operating mode of the machine into the travel mode.

19. Press the attachment pedal in the back direction.

20. Read the pressure on the gauge at tap (21) .

21. Repeat step 15 through step 20 until the desired pressure is reached.

    Note: Always make the final pressure adjustment on the pressure rise.

22. Scroll to "Forward Dir Max Press %".

23. Use the up arrow and the down arrow to enter a value from 0 to 100. Start with a value of 50.

    Note: When the "Forward Dir Max Press %" is changed, the maximum pressure to the attachment will change.

    Note: The value is not an actual pressure. The value is a percent of the current that is being sent to the solenoid valve for pressure control.

24. Press the Set key.

25. Press the attachment pedal in the forward direction.

26. Read the pressure on the gauge at tap (21) .

27. Repeat step 23 through step 26 until the desired pressure is reached.

    Note: Always make the final pressure adjustment on the pressure rise.

28. Return the load sensing signal limiter valve to the original setting. Refer to Testing and Adjusting, "Relief Valve (Signal Limiter) - Test and Adjust".

Monitor Reference Section

Utilizing the Monitor to Modify Tool Parameters

The machine monitor can be used instead of Electronic Technician in order to change flow and pressure values.

Illustration 8	g00915978

In order to reach the "Tool Adjust" menu, go to the "Service Option PW" menu. See Systems Operation, "Service Options PW Menu" for more information. After you have reached the menu, press the down key (6) in order to highlight "TOOL ADJUST". Press the OK key (8). You can press the cancel key (7) at any time in order to return to the main menu.

Illustration 9	g00839999

Press the left key (5) or press the right key (2) in order to scroll through the tools. Press the OK key (8) in order to modify the values for the tool that is being adjusted. Active tools or inactive tools can be adjusted.

Procedure For Modifying Parameter Values Of The Tool

The following parameters can be modified for each of the five tools:

1. Name of the tool

2. Flow in one direction or flow in two directions

3. Maximum pressure for the reverse direction

4. Maximum flow for reverse direction

5. Maximum pressure for the forward direction

6. Maximum flow for forward direction

Name of the Tool

Illustration 10	g00857721

The name of the tool is the first parameter that is shown. The cursor moves to the right when the OK key (8) is pressed. Each character is changed by utilizing the up key (1) and the down key (6). The valid characters are "A" to "Z" and "0" to "9". After the name of the tool has been set by pressing the set key (3), move to the next parameter by pressing the right key (2) .

Direction Of Flow

Illustration 11	g00915979

The direction of flow for the tool must be programmed. When the tool is bidirectional, all of the following four parameters are programmable. If the tool is unidirectional, only the parameters for the reverse direction will be shown.

Maximum Pressure In The Reverse Direction

Illustration 12	g00857806

The maximum pressure in the reverse direction is changed by utilizing the up key (1) and the down key (6). Press the set key (3) in order to save the value.

Maximum Flow In The Reverse Direction

Illustration 13	g00857808

The maximum flow in the reverse direction is changed by utilizing the up key (1) and the down key (6). Press the set key (3) in order to save the value.

Maximum Pressure In The Forward Direction

Illustration 14	g00857807

The maximum pressure in the forward direction is changed by utilizing the up key (1) and the down key (6). Press the set key (3) in order to save the value.

Maximum Flow In The Forward Direction

Illustration 15	g00857809

The maximum flow in the forward direction is changed with the up key (1) and the down key (6). Press the set key (3) in order to save the value.