824H Wheel Dozer, 825H Soil Compactor and 826H Landfill Compactor Electrohydraulic System Caterpillar

The calibration procedure with the 4C-8195 Control Service Tool and the Caterpillar Electronic Technician (ET) will follow the same strategy. A text message that is displayed in the ET will be displayed as a numerical code on the Caterpillar Monitoring System.

Illustration 1	g01129652
Fuse Panel (1) Diagnostic service tool connector (Caterpillar Monitoring System). (2) Fuses.

The fuse panel is located behind the access cover in the right rear panel of the cab.

Illustration 2	g01129633
Location of the Display on the Dash Panel

Illustration 3	g00828862
Symbol for the Hour Meter

The "Clear" switch is used in order to step through the program in Caterpillar Monitoring System. The technician should toggle the "Clear" switch as the display for the Caterpillar Monitoring System shows the symbol for the Hour Meter.

The numerical code will use as many as six digits. The digits are divided into three fields with two digits in each field. For example, "_ _82_ _" represents the implement function. For example, "30_ _01", "31_ _01", "32_ _01", "33_ _01", "34_ _01", and "35_ _01" are the calibration modes for the solenoid valves. The first two digits represent the calibration submode for the main control valve. The last two digits are for the position in the calibration.

All of the calibrations for the solenoids on the control valve will be very similar. The main difference in the procedures will be the change in the movement of the control levers. The numerical code that is displayed on the Caterpillar monitoring system will depend on the implement function that is being calibrated. Refer to Table 1 for the correct calibration submode.

Table 1

Calibration Submode	Description of Calibration
30	Lift raise solenoid valve
31	Lift lower solenoid valve
32	Tilt left solenoid valve
33	Tilt right solenoid valve
34	Tip back solenoid valve
35	Tip forward solenoid valve

If you are unable to determine the cause of an error code, check for diagnostic codes or for hydraulic system problems.

Reference: For more information on determining problems with the hydraulic system, refer to Troubleshooting and Testing and Adjusting, "Hydraulic System Troubleshooting" for the machine that is being service.

Calibration Procedures

1. Move away from other operating machines and away from personnel. Park the machine on a smooth, level surface. Lower the work tool to the ground. Turn the engine start switch to the OFF position.

2. Connect the 4C-8195 Control Service Tool to service connector (1) .

3. Operate the machine until the hydraulic oil reaches normal operating temperature. Ensure that the ride control system is in the OFFposition on machines that are so equipped.

4. Enter the calibration mode. Toggle and hold the "Mode" switch until "-8-" is shown on the display. Release the "Mode" switch when "-8-" is shown on the display. The display should show "_ _81_ _".

5. Toggle the Scroll switch until "_ _82_ _" is shown on the display.

6. Toggle the "Clear" switch. The display should show "82_ _10".

   Note: You may proceed to the calibration of any one of the solenoids at this time.

7. Start the engine.

Calibrate the Lift Raise Solenoid Valve

1. Enter the submode for calibrating the lift raise solenoid. Toggle the "Scroll" switch until the display shows "82_ _30". Press the "Clear" switch. The display should read "30_ _01".

   Note: If the parking brake is set and the implement lockout switch is disengaged the display should read "30_ _02". Go to Step 3.

2. Set the parking brake and disengage the implement lockout switch. The display should show "30_ _02".

3. Set the engine speed to high idle. The display will show "30_ _03".

4. Move the lift cylinder to the mid-travel position. Toggle the "Clear" switch. The display should show "30_ _04".

5. Release the joystick control. Then press the "Clear" switch. The display should show "30_ _05".

6. Move the joystick control to the full RAISE position and hold. The lift raise solenoid valve is being calibrated. Toggle the "Clear" switch when movement in the blade is detected. The display will show "30_ _06".

7. Release the joystick control. Toggle the "Clear" switch. The display should show "30_ _--". The calibration of the lift raise solenoid was successful.

8. Proceed to the Section "Calibrate the Lift Lower Solenoid Valve". Toggle the "Mode" switch in order to go to the next calibration. The display should show "82_ _31".

9. Toggle the "Mode" switch in order to exit out of the calibration mode.

10. If this is the last calibration, set the engine speed to low idle and lower the blade to the ground.

Calibrate the Lift Lower Solenoid Valve

1. Toggle the "Scroll" switch until the display shows "82_ _31".

2. Enter the submode for calibrating the lift lower solenoid valve. Toggle the "Clear" switch. The display should show "31_ _01".

   Note: If the parking brake is set and the implement lockout switch is disengaged the display should show "31_ _02". Go to Step 4.

3. Set the parking brake and disengage the implement lockout switch. The display should show "31_ _02".

4. Set the engine speed to high idle. The display will show "31_ _03".

5. Move the lift cylinder to the mid-travel position. Move the tilt linkage to the mid-travel position. Toggle the "Clear" switch. The display should show "31_ _04".

6. Release the joystick control. Toggle the "Clear" Switch. The display will show "31_ _05".

7. Move the joystick control to the full LOWER position and hold. The lift lower solenoid valve is being calibrated. Toggle the "Clear" switch when movement in the blade is detected. The display should show "31_ _06".

8. Release the joystick control. Toggle the "Clear" switch. The display should show "31_ _ --". The calibration of the lift lower solenoid valve was successful.

9. Proceed to the Section "Calibration of the Tilt Left Solenoid Valve". Toggle the "Mode" switch in order to go to the next calibration. The display should show "82_ _32".

10. Toggle the "Mode" switch in order to exit out of the calibration mode.

11. If this is the last calibration, set the engine speed to low idle and lower the blade to the ground.

Calibration of the Tilt Left Solenoid Valve

1. Toggle the "Scroll" switch until the display shows "82_ _32".

2. Enter the submode for calibrating the tilt left solenoid valve. Toggle the "Clear" switch. The display should show "32_ _01".

   Note: If the parking brake is set and the implement lockout switch is disengaged the display should show "32_ _02". Go to Step 4.

3. Set the parking brake and disengage the implement lockout switch. The display should show "32_ _02".

4. Set the engine speed to high idle. The display will show "32_ _03".

5. Move the lift cylinders to the mid-travel position. Move the tilt cylinder to the mid-travel position. Toggle the "Clear" switch. The display should show "32_ _04".

6. Release the joystick control. Toggle the "Clear" Switch. The display will show "32_ _05".

7. Move the joystick control to the full TILT RIGHT position and hold. The tilt right solenoid valve is being calibrated. Toggle the "Clear" switch when movement in the blade is detected. The display should show "32_ _06".

8. Release the joystick control. Toggle the "Clear" switch. The display should show "32_ _ --". The calibration of the tilt left solenoid valve was successful.

9. Proceed to the Section "Calibration of the Tilt Right Solenoid Valve". Toggle the "Mode" switch in order to go to the next calibration. The display should show "82_ _33".

10. Toggle the "Mode" switch in order to exit out of the calibration mode.

11. If this is the last calibration, set the engine speed to low idle and lower the blade to the ground.

Calibration of the Tilt Right Solenoid Valve

1. Toggle the "Scroll" switch until the display shows "82_ _33".

2. Enter the submode for calibrating the tilt right solenoid valve. Toggle the "Clear" switch. The display should show "33_ _01".

   Note: If the parking brake is set and the implement lockout switch is disengaged the display should show "33_ _02". Go to Step 4.

3. Set the parking brake and disengage the implement lockout switch. The display should show "33_ _02".

4. Set the engine speed to high idle. The display will show "33_ _03".

5. Move the lift cylinder to the mid-travel position. Move the tilt cylinder to the mid-travel position. Toggle the "Clear" switch. The display should show "33_ _04".

6. Release the joystick control. Toggle the "Clear" Switch. The display will show "33_ _05".

7. Move the joystick control to the full TILT LEFT position and hold. The tilt left solenoid valve is being calibrated. Toggle the "Clear" switch when movement in the blade is detected. The display should show "33_ _06".

8. Release the joystick control. Toggle the "Clear" switch. The display should show "33_ _ --". The calibration of the tilt left solenoid valve was successful.

9. Proceed to the Section "Calibration of the Tip Back Solenoid Valve". Toggle the "Mode" switch in order to go to the next calibration. The display should show "82_ _34".

10. Toggle the "Mode" switch in order to exit out of the calibration mode.

11. If this is the last calibration, set the engine speed to low idle and lower the blade to the ground.

Calibration of the Tip Back Solenoid Valve

1. Enter the submode for calibrating the lift raise solenoid. Toggle the "Scroll" switch until the display shows "82_ _34".

2. Enter the submode for calibrating the tip back solenoid valve. Toggle the "Clear" switch. The display should show "34_ _01".

   Note: If the parking brake is set and the implement lockout switch is disengaged the display should show "34_ _02". Go to Step 4.

3. Set the parking brake and disengage the implement lockout switch. The display should show "34_ _02".

4. Set the engine speed to high idle. The display will show "34_ _03".

5. Move the lift cylinder to the mid-travel position. Move the tip cylinder to the mid-travel position. Toggle the "Clear" switch. The display should show "34_ _04".

6. Release the joystick control. Toggle the "Clear" Switch. The display will show "34_ _05".

7. Press and hold the implement select switch until the step is completed. Move the joystick to the full TIP BACK position and hold. The tip back solenoid valve is being calibrated. Toggle the "Clear" switch when movement in the tip back direction of the blade is detected. The display should show "34_ _06".

8. Release the tip control lever and the implement select switch. Toggle the "Clear" switch. The display should show "34_ _ --". The calibration of the tip back solenoid valve was successful.

9. Proceed to the Section "Calibration of the Tip Forward Solenoid Valve". Toggle the "Mode" switch in order to go to the next calibration. The display should show "82_ _35".

10. Toggle the "Mode" switch in order to exit out of the calibration mode.

11. If this is the last calibration, set the engine speed to low idle and lower the blade to the ground.

Calibration of the Tip Forward Solenoid Valve

1. Toggle the "Scroll" switch until the display shows "82_ _35".

2. Enter the submode for calibrating the tip forward solenoid valve. Toggle the "Clear" switch. The display should show "35_ _01".

   Note: If the parking brake is set and the implement lockout switch is disengaged the display should show "35_ _02". Go to Step 4.

3. Set the parking brake and disengage the implement lockout switch. The display should show "35_ _02".

4. Set the engine speed to high idle. The display will show "35_ _03".

5. Move the lift cylinder to the mid-travel position. Move the tip cylinder to the mid-travel position. Toggle the "Clear" switch. The display should show "35_ _04".

6. Release the joystick control. Toggle the "Clear" Switch. The display will show "35_ _05".

7. Press and hold the implement select switch until the step is completed. Move the joystick control to the full TIP FORWARD position and hold. The tip forward solenoid valve is being calibrated. Toggle the "Clear" switch when movement in the tip forward direction of the blade is detected. The display should show "35_ _06".

8. Release the lift control lever and the implement select switch. Toggle the "Clear" switch. The display should show "35_ _ --". The calibration of the tip forward solenoid valve was successful.

9. Toggle the "Mode" switch in order to exit out of the calibration mode.

10. If this is the last calibration, set the engine speed to low idle and lower the blade to the ground.

Calibration Failure Messages

The numerical code will use as many as six digits. The digits are divided into three fields with two digits in each field.

Active Code

The first two digits represent the submode for the implement calibration. Use the last four digits of the code to determine the cause of the failure. The display will toggle between "30E002" and "30E009". The last two digits show that the program has stopped the calibration in that submode. At this time, the error must be repaired before attempting to finish the calibration.

Calibration Range is Too High

The first two digits represent the submode for the implement calibration. Use the last four digits of the code in order to determine the cause of the failure. For example, "30E105" indicates that the current is above the range that is allowed. The ECM ramps from low current to high current. If the blade does not show any movement, the error is displayed. The error will be displayed, if the operator does not press the "Clear" switch. The operator must toggle the "Clear" switch when movement is indicated. At this time, the problem that is causing the error must be repaired before attempting to finish the calibration.