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320 GC Excavator KTN00001-UP (MACHINE) POWERED BY C4.4 Engine(M008523... Page 1 of 10

Shutdown SIS Previous Screen Product: EXCAVATOR Model: 320 GC EXCAVATOR KTN Configuration: 320 GC Excavator KTN00001-UP (MACHINE) POWERED BY C4.4 Engine

Testing and Adjusting 320 GC, 320 and 323 Excavator Machine Systems Media Number -M0081159-02

Publication Date -01/07/2018

Date Updated -09/07/2018

i06947994

Relief Valve (Line) - Test and Adjust SMCS - 5117-025-L9; 5117-081-L9

Specifications Table 1 "Relief Valve (Line) - Test and Adjust" Main Relief Pressure(1) Machine Settings

Cylinder

35000 + 500 , - 2000 kPa (5076 + 73 , - 290 psi)

Heavy lift

38000 + 500, - 2000 kPa (5512 + 73, - 290 psi) Actual

Cylinder Position

Engine Speed

Relief Pressure Setting

Extended

Speed Dial "7" AEC switch OFF

41000 ± 500 kPa (5947 ± 73 psi)

Boom Retracted Extended Stick Retracted Bucket

Standard

Extended Retracted

38000 ± 500 kPa (5511 ± 73 psi)

Speed Dial "7" AEC switch OFF

38000 ± 500 kPa (5511 ± 73 psi)

Speed Dial "7"

38000 ± 500 kPa (5511 ± 73 psi)

41000 ± 500 kPa (5947 ± 73 psi)

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AEC switch OFF Extended VA Boom Retracted (1)

38000 ± 500 kPa (5511 ± 73 psi)

Speed Dial "7" AEC switch OFF

41000 ± 500 kPa (5947 ± 73 psi)

System pressure setting before temporary setting adjustment

Introduction The line relief valves are located between each cylinder and the respective control valve. The line relief valve limits the overload pressures that can be created in the implement cylinders. The line relief valves are located on the top side and bottom side of the main control valve. The line relief valves are after removal of the cover.

Required Tools

Illustration 1

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Tooling group "A" 198-4240 Digital Pressure Indicator Gp

Table 2 Tool

Item

Qty

A

Part Number

Description

198-4240

Digital Pressure Indicator Gp

A1

1

198-4234

Indicator

A2

2

198-4239

Pressure Sensor 41,368 kPa (6,000 psi)

A3

2

198-4236

Extension Cable

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Machine Preparation 1. Position the machine on level ground and stop the engine. 2. Release the pressure in the hydraulic system. Refer to Operation and Maintenance Manual, "System Pressure Release".

Illustration 2

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Pump compartment (1) Pressure tap (pump 1) (2) Pressure tap (pump 2)

3. Attach both 41,368 kPa (6,000 psi) pressure sensors to pressure tap (1) and pressure tap (2).

Test Procedure Note: A temporary setting of the main relief valve is required before any line relief valves can be adjusted. Refer to Table 3 for temporary main relief setting for the function being tested. Table 3 Function

Temporary Main Relief Setting

Boom Cylinder Rod End Stick Cylinder Head End 38000 ± 500 kPa (5511 ± 73 psi) Bucket Cylinder Head End Bucket Cylinder Rod End

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Boom Cylinder Head End 41000 ± 500 kPa (5947 ± 73 psi) Stick Cylinder Rod End Table 4 Relief Valve

Pressure Change With One Turn Of Adjustment Screw

Main relief valve

14400 kPa (2100 psi)

Line relief valves

19800 kPa (2871 psi)

Note: Pressure values in Table 4 are approximate values. Use a pressure gauge for adjustment.

Bucket Cylinder Head End, Bucket Cylinder Rod End, Boom Cylinder Rod End, and Stick Cylinder Head End Note: A continuous relief of the valve for more than 10 seconds is not allowed.

Illustration 3

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Main control valve (3) Main relief valve (4) Line relief valve for the boom cylinder rod end (5) Line relief valve for the stick cylinder head end (6) Line relief valve for the bucket cylinder rod end (7) Line relief valve for the bucket cylinder head end

1. Start the engine. 2. Place the hydraulic activation control lever in the UNLOCKED position.

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3. Place the machine controls at the following settings: engine speed dial "7" and AEC switch OFF. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings. 4. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F). 5. Move the joystick for the stick until the stick is at the full STICK OUT position (full retraction of the stick cylinder). 6. Check the main relief valve pressure setting at pressure tap (1) or pressure tap (2). The main relief valve pressure setting should be 35000 + 500 - 1000 kPa (5076 + 73 - 145 psi).

Illustration 4

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Main relief valve (standard) (A) Adjustment screw (L) Locknut

Illustration 5

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Main relief valve (heavy lift) (A) Adjustment screw (L) Locknut

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7. Loosen the locknut. Set the main relief pressure to 38000 ± 500 kPa (5511 ± 73 psi). Turn the adjustment screw clockwise in order to increase the pressure. Turn the adjustment screw counterclockwise in order to decrease the pressure. Tighten the locknut. Note: Always make final pressure adjustments on pressure rise. 8. the temporary main relief pressure setting with a second function. Move the joystick for the boom until the boom is at full BOOM RAISE position (full extension of the boom cylinder). The main relief pressure should be 38000 ± 500 kPa (5511 ± 73 psi). 9. Mark the original position of the line relief for the bucket cylinder head end (7). 10. Move the joystick for the bucket until the bucket is at the full BUCKET CLOSE position (full extension of bucket cylinder). 11. Check the pressure setting of the line relief for the bucket cylinder head end (7). 12. Loosen the locknut of the bucket line relief valve. Turn adjustment screw of the bucket line relief valve until the pressure reading at pressure tap (1) is 35000 kPa (5076 psi). 13. Move the joystick for the bucket until the bucket is at the full BUCKET CLOSE position (full extension of bucket cylinder). 14. Check the pressure setting of the line relief for the bucket cylinder head end (7). 15. Turn the adjustment screw of the bucket line relief valve until the pressure reading at pressure tap (1) is 38000 ± 500 kPa (5511 ± 73 psi). Note: Always make final pressure adjustments on the pressure rise. Note: In order to prevent over setting, the adjustment should be stopped immediately after the pressure becomes within specification. 16. Repeat Step 9 to Step 15 for the following line relief valves: ◦ Line relief valve for bucket cylinder rod end ◦ Line relief valve for stick cylinder head end ◦ Line relief valve for boom cylinder rod end 17. Reset main relief valve pressure setting to the normal operating condition after the completion of the line relief test and adjust. Refer to Testing and Adjusting, "Relief Valve (Main) - Test and Adjust".

Boom Cylinder Head End and Stick Cylinder Rod End Note: A continuous relief of the valve for more than 10 seconds is not allowed.

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Illustration 6

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Main control valve (3) Main relief valve (8) Line relief valve for the boom cylinder head end (9) Line relief valve for the stick cylinder rod end

1. Mark the original position of the line relief valve for the stick cylinder rod end (9). 2. Loosen the locknut for line relief valve (9). Turn the adjustment screw clockwise by one quarter turn. Tighten the locknut. 3. Start the engine. 4. Place the hydraulic activation control lever in the UNLOCKED position. 5. Place the machine controls at the following settings: engine speed dial "7" and AEC switch OFF. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings. 6. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F). 7. Move the joystick for the stick until the stick is at the full STICK OUT position (full retraction of stick cylinder). 8. Check the main relief valve pressure setting at pressure tap (1) or pressure tap (2). The main relief pressure setting should be 35000 + 500 - 1000 kPa (5076 + 73 - 145 psi).

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Illustration 7

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Main relief valve (standard) (A) Adjustment screw (L) Locknut

Illustration 8

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Main relief valve (heavy lift) (A) Adjustment screw (L) Locknut

9. Loosen the locknut. Set the main relief pressure to 41000 ± 500 kPa (5947 ± 73 psi). Turn the adjustment screw clockwise to increase the pressure. Turn the adjustment screw counterclockwise to decrease the pressure. Tighten the locknut. Note: Always make final pressure adjustments on pressure rise. 10. Mark the original position of the line relief valve for the boom cylinder head end (8). 11. Move the joystick for the boom until the boom is at the full BOOM RAISE position (full extension of boom cylinders). 12. Check the pressure setting of the line relief valve for the boom cylinder head end (8).

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13. Loosen the locknut of the boom line relief valve. Turn adjustment screw of the boom line relief valve until the pressure reading at pressure tap (1) is 37000 kPa (5366 psi). 14. Move the joystick for the boom until the boom is at the full BOOM RAISE position (full extension of boom cylinders). 15. Check the pressure setting of the line relief valve for the boom cylinder head end (8). 16. Turn the adjustment screw of the boom line relief valve until the pressure reading at pressure tap (1) is 41000 ± 500 kPa (5947 ± 73 psi). Note: Always make final pressure adjustments on the pressure rise. Note: To prevent over setting, the adjustment should be stopped immediately after the pressure becomes within specification. 17. Move the joystick for the stick until the stick is at the full STICK OUT position (full retraction of stick cylinder). 18. Check the pressure setting of the line relief for the stick cylinder rod end (9). 19. Loosen the locknut for the stick line relief valve (9). Turn adjustment screw of the stick line relief valve counterclockwise until the pressure reading at pressure tap (1) is 37000 kPa (5366 psi). 20. Move the joystick for the stick until the stick is at the full STICK OUT position (full retraction of stick cylinder). 21. Check the pressure setting of the line relief for the stick cylinder rod end (9). 22. Turn the adjustment screw of the stick line relief valve until the pressure reading at pressure tap (1) is 41000 ± 500 kPa (5947 ± 73 psi). Note: Always make final pressure adjustments on the pressure rise. Note: To prevent over setting, the adjustment should be stopped immediately after the pressure becomes within specification. 23. Reset main relief valve pressure setting to the normal operating condition after the completion of the line relief test and adjust. Refer to Testing and Adjusting, "Relief Valve (Main) - Test and Adjust".

Adjustment Procedure

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Illustration 9

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g06195135

Line relief valve (typical example) (A) Adjustment screw (L) Locknut

1. Loosen locknut and turn the adjustment screw clockwise to increase pressure. Turn adjustment screw counterclockwise to decrease pressure. Note: Always make final pressure adjustments on the pressure rise. 2. Tighten the locknut to specification once adjustments are complete. Copyright 1993 - 2019 Caterpillar Inc.

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