Calibration of Telescopic Material Handler Mark III Control Boxes{5725} Caterpillar


Calibration of Telescopic Material Handler Mark III Control Boxes{5725}

Usage:

RT80 and RT100 (1GJ1-Up)

Introduction

This instruction provides the information necessary to calibrate 838946 and 6R8995 Electronic Control Boxes.

Calibration may be required following repairs, replacements or adjustments to the machine hydraulic or electrical systems. Before returning the machine to service, operate all motions slowly until the hydraulic oil is at normal operating temperature and then check the boom and attachment motions for smoothness of operation and maximum speed. If the speeds are not to specification, or the control response is not correct, calibration of the electronic control box will be necessary.

Early machines are equipped with 838946 Control Box. The 838946 Control Box does not have the ability to operate an auto height/auto reach system and is pre-programmed to operate with the type 1 boom and attachment controller (joystick) arrangement only.

Later machines are equipped with 6R8995 Control Box. The 6R8995 Control Box has the ability to operate either a standard system, or an auto height/auto reach system. It is pre - programmed to operate with either type 1 or type 2 boom and attachment controller arrangements. Type 1 and type 2 boom and attachment controller arrangements are described in the Operation and Maintenance Manual.

The calibration procedure does not involve any adjustments to the control box and is carried out from the operators station using the boom and attachment controller. The control box electronics temporarily change the function of the controller for calibration purposes.

The purpose of the calibration procedure is:

1. To set the zero positions and speeds of the boom and attachment motions.
2. To match the control box operation to the model type, and the boom and attachment controller arrangement installed (6R8995 only).
3. To set up the auto height/auto reach system on machines so equipped (6R8995 only).

The control box generates audible tones and a visual display for reference during calibration.

Calibration is carried out in up to eight stages. Pre-entry to each stage of calibration is signalled by audible tones in the sequence shown in the chart.

It is possible to move forward through the calibration stages by pressing the right side button on the front of the boom and attachment controller, or move backwards through the calibration stages by pressing the left side button on the front of the boom and attachment controller. If a new part is installed it is possible to step through the procedure and calibrate only the function(s) associated with the new part. See the component replacement table in the 'Fault Finding Guide' section of this publication.

Reference: Parts Book SEBN8601 Service Manual SENB8470 Operation and Maintenance Manual SEBU6387

Tools Needed

A stop-watch or a wrist-watch that can measure seconds is needed. For calibration of 6R8995 control box on machines equipped with auto height/auto reach, a spirit level with a 45° vial or a spirit level and an inclinometer are needed.

Preparation

------ WARNING! ------

Diesel engine exhaust contains products of combustion which may be harmful to your health. Always start and operate the engine in a well ventilated area and, if in an enclosed area, vent the exhaust to the outside.

-------WARNING!-------

1. Park the machine on firm, level ground in a well ventilated area with enough space to fully elevate and extend the boom. The machine must be positioned so that the boom can be lowered below ground level (on a loading bay for example). The hydraulic oil should be at operating temperature.

2. Determine which boom and attachment controller arrangement is installed by referring to the decal next to the controller.


Decal on machines equipped with type 1 boom and attachment controller arrangement. This arrangement is commonly found in North America.


Decal on machines equipped with type 2 boom and attachment controller arrangement. This arrangement is commonly found in Europe.

3. Remove two screws (1) and trim (2).

4. Remove six nuts (3) and pull control box (4) forward. Note the position of calibration switch (5).

5. Move auto/manual switch (6) to MANUAL.

6. Move attachment carriage tilt response switch (7) (if equipped) to OFF.

7. Turn the engine start switch ON to energize the electrical circuits.

8. Check the display on the control box. The display should show "0" or "3".

"0" indicates that the control box is in manual mode.

"3" indicates that the control box is in an uncalibrated raw condition.

If the display shows a "2", this indicates EITHER:

a) that the control box is already in calibration mode (the calibration switch (5) has been moved to the calibration position) OR
b) that there is a fault.

If the control box is permanently in this mode, either the wiring harness, calibration switch or the control box have been damaged.

If the display shows any other reading, a fault is indicated. Refer to the fault code charts at the end of this publication and repair the fault before continuing.

9. Start the engine and operate all of the boom and attachment motions. If the display continues to show "0", "1" or "3", continue with the calibration.

10. Operate the engine at low idle. The engine must be operated throughout the calibration procedure. If the engine start switch is turned OFF for any reason during calibration, all new settings will be lost and the procedure must be restarted.

11. Move calibration switch (5) to the calibration position. The control box display will now show "2" indicating that it is in the calibration mode.

12. Move auto/manual switch (6) to AUTO, then back to MANUAL and listen to the tones generated by the control box.

A 6R8995 control box will generate two long and one short tone. If the control box is a 6R8995, carry out stages 1 to 5 of the calibration procedure that follows. (stages 1 to 8 on machines equipped for auto height/auto reach operation).

An 838946 control box will generate three short tones. If the control box is an 838946, miss out stages 1 and 2 of the following calibration procedure.

Stage 1 - Controller (Joystick) Arrangement - (6R8995 Control Box Only)
(6R8995 Control Box Only)

1. Enter stage 1 by moving auto/manual switch (6) to AUTO, then back to MANUAL. Type 1 boom and attachment controller arrangement is now selected.

If type 2 boom and attachment controller arrangement is required, press the right side button on the front of the controller.

It is possible to alternate between types 1 and 2 by pressing the left and right buttons on the control. Be sure that the correct selection is made by referring to the controller decal as described previously.

2. Record the control arrangement selection by moving the auto/manual switch to AUTO, then back to MANUAL. Three long tones will be generated indicating pre-entry to the next stage of calibration.

Stage 2 - Model Type - (6R8995 Control Box Only)
(6R8995 Control Box Only)

1. Enter stage 2 by moving auto/manual switch (6) to AUTO, then back to MANUAL.

2. Press the left side button on the front of the boom and attachment controller three times. RT80 and RT100 model types are now selected.

NOTE: The control box defaults to RT80/RT100 model selection. However, if the right side button is pressed accidentally the wrong model will be selected. Pressing the left side button three times guarantees RT80/RT100 selection.

3. Record the model type selection by moving the auto/manual switch to AUTO, then back to MANUAL. Three short tones will be generated indicating pre-entry to the next stage of calibration.

Stage 3 - Controller (Joystick) Directions

1. Enter stage 3 by moving auto/manual switch (6) to AUTO, then back to MANUAL.

2. Move the boom and attachment controller fully back (the boom will not move) and hold in this position until three short tones are generated, then return the controller to the HOLD (center) position).

3. Repeat step 2 for each of the remaining five controller positions in the following sequence:

Fully forwardFully to the rightFully to the leftRight side button fully pressedLeft side button fully pressedWait for the three short tones in each position.

4. When the left side button is released, the controller directions are recorded and control box generates two short and one long tone indicating pre-entry to the next stage of calibration.

Stage 4 - Zero Positions

This stage of the procedure sets up the directional control valve spool opening positions (the positions where oil starts to flow to the boom and attachment motion cylinders).

1. Enter stage 4 by moving auto/manual switch (6) to AUTO, then back to MANUAL.

2. Raise the boom to approximately 40° and extend to the mid position.

3. Move the auto/manual switch to AUTO. The control box will now generate a continuous series of short tones.

4. Move the boom and attachment controller fully back. When the boom starts to rise, release the control to the HOLD position. The boom will continue to rise. Move the controller fully forward and immediately release. Repeat this until the boom motion stops.

5. Move the auto/manual switch to MANUAL. The continuous series of short tones will stop. Use the controller to check that the motion is smooth, and that the speed can be varied smoothly between creep speed at initial controller offset, to high speed at maximum controller offset. If it is not, repeat steps 3 and 4.

6. Move the auto/manual switch to AUTO and then press the right button on the front of the controller. This records the zero position for BOOM RAISE and automatically selects the next motion for zero position setting.

Repeat steps 4 to 6 five more times. Each time the sequence is repeated a different motion will result, even though the boom and attachment controller is moved back. Motions will occur in the following sequence:

Boom LowerBoom ExtendBoom RetractAttachment Carriage Tilt BackAttachment Carriage Tilt Forward

It is possible to move back through the order at any time by pressing the left button on the front of the controller with the auto/manual switch in AUTO. Each time the left button is pressed and released the control box reverts one place in the order. This enables motions already set to be re-adjusted.

After recording the last zero position (attachment carriage tilt forward) by pressing the right button on the front of the controller, the audible tones will stop.

The zero positions for each motion are now established.

7. When all zero positions are set, move the auto/manual switch to MANUAL. The control box will generate three tones - short, long, short - indicating pre-entry to the next stage of calibration.

Stage 5 - Motion Speed

1. Enter stage 5 by moving the auto/manual switch to AUTO, then back to MANUAL.

2. With the boom fully retracted and lowered and the engine operating at maximum speed, measure the time required to fully raise the boom. Compare the result with the specification in the chart.

3. To adjust boom raise speed, move the auto/manual switch to AUTO. The tone will now sound continuously in the sequence shown in the chart.

4. To increase the speed, pull the controller fully back and hold for 1 - 2 seconds. The boom will not move but the control box will reduce boom raise time. To decrease the speed, push the controller fully forward and hold for 1 - 2 seconds. The boom will not move but the control box will increase the boom raise time.

5. Move the auto/manual switch to MANUAL and check that the boom raise speed can be varied smoothly between creep speed at initial controller offset, to maximum speed at maximum controller offset. If progressive control is lost due to full speed being reached before full control offset is reached, the control may have been held back too long in the selected position in step 4.

6. Repeat steps 2 to 5 until the motion time and operating characteristic is correct.

7. When the boom raise time is correct, move the auto/manual switch to AUTO. Press the right side button on the front of the controller. The control box will record the boom raise time and then advance to the boom lower mode. There will be a pause in the audible tones when the button is pressed and the boom lower tone sequence will start when the button is released.

8. Move the auto/manual switch to MANUAL.

9. Repeat steps 2 to 8 for each of the motions listed in the chart. The boom must remain fully retracted while measuring boom lower speed.

Speed adjustment is carried out by moving the controller backward or forward (with the auto/manual switch in AUTO) in all cases.

Use the audible tones to confirm which motion is being adjusted.

The control box will advance through the motions in the order shown in the chart when the right button is pressed with the auto/manual switch in AUTO.

It is possible to move back through the order at any time by pressing the left button on the front of the controller with the auto/manual switch in AUTO. Each time the left button is pressed and released the control box reverts one place in the order. This enables motions already set to be re-adjusted.

10. When the speed of the last motion shown in the chart has been recorded (step 7) the audible tones will stop.

11. When the auto/manual switch is moved to MANUAL the control box will generate a sequence of audible tones which indicate current status:

* If the sequence is continuous and consists of long tones, calibration has failed and the whole procedure must be repeated. This is done by moving calibration switch (5) to normal mode, then back to calibrate mode.
* If the machine is NOT equipped for auto height/auto reach operation, the sequence should be continuous and consist of one long followed by two short tones. This indicates that the control box calibration has been successful. In this case the calibration can be saved and normal operation resumed by returning calibration switch (5) to normal. A "0" will now be shown in the control box display. The calibration is not saved until this step is completed.
* If the machine IS equipped for auto height/auto reach operation (6R8995 Control Box Only), the sequence should be one short followed by two long tones. This indicates that the motion speed calibration has been updated and signals pre-entry to stage 6 of the calibration procedure.

Auto Height/Auto Reach

The calibration procedure for auto height/auto reach operation is carried out with the machine frame set horizontal. Adjustments are made with the boom set horizontal, and at 45°. It is important that these settings are established within 0.5°.

To obtain correct operation of the auto height/auto reach system, the zero positions and motion speeds (stages 4 and 5) MUST be set accurately.

Stage 6 - Boom Angle

1. Set the machine so that the frame is horizontal. Use a spirit level placed on one of the frame top rails. Adjustment can be achieved by moving the machine back and forward if the ground is not flat or by driving the low wheels onto packing.

2. Enter stage 6 by moving the auto/manual switch to AUTO, then back to MANUAL.

3. Fully retract the boom and set it horizontal using a spirit level placed on the first section.

4. Record the boom horizontal position by moving the auto/manual switch to AUTO, then back to MANUAL.

5. Set the boom angle to 45°.

6. Record the 45° position by moving the auto/manual switch to AUTO, then back to MANUAL.

7. The system will now generate one long followed by two short tones indicating pre-entry to the next stage of calibration.

Stage 7 - Machine Angle

1. Move the auto/manual switch to AUTO, then back to MANUAL.

2. Check that the machine frame is horizontal and that angle sensor (8) is in position (A) as shown.

3. Record position (A) by moving the auto/manual switch to AUTO, then back to MANUAL.

4. Loosen bolts (9) and rotate the angle sensor to position (B) as shown. Tighten the bolts.

5. Record position (B) by moving the auto/manual switch to AUTO, then back to MANUAL.

6. Loosen bolts (9), rotate the machine angle sensor back to position (A) and tighten the bolts. The control box should remain silent.

7. Record the angle sensor positions by moving the auto/manual switch to AUTO, then back to MANUAL. The control box will generate a sequence of one long, one short, one long tone indicating pre-entry to the next stage of calibration.

If the system generates continuous short tones for 3 seconds, followed by one long and two short tones, positions (A) and (B) were not recorded correctly and steps 1 to 7 must be repeated. If the problem persists, check the sensor and wiring.

Stage 8 - Boom End Stop

1. Move the auto/manual switch to AUTO, then back to MANUAL.

2. Fully retract and lower the boom to minimum angle (fully down).

3. Record the boom minimum angle and length by moving the auto/manual switch to AUTO, then back to MANUAL.

4. Raise the boom to maximum angle, then fully extend. The control box should remain silent.

5. Record the boom maximum angle and length by moving the auto/manual switch to AUTO, then back to MANUAL.

If the control box generates a continuous sequence of one long tone followed by two short tones, calibration has been successful.

If the control box generates short tones for 2-3 seconds, followed by one long, one short and then one long tone, minimum and maximum positions were not recorded correctly and steps 1 to 5 must be repeated. If new sensors have been installed, check the wiring connections.

If the control box generates a continuous sequence of long tones, calibration has failed completely and the entire procedure must be repeated. This could be due to stages being missed out or the boom being moved in the wrong direction at some stage.

6. Save the calibration and return to normal operation mode by moving calibration switch (5) to NORMAL. The display will show "0" and the control box will be silent. The calibration is not saved until this step is completed.

Final Check

Before returning the machine to service, check that all boom and attachment motions are operating smoothly and at the correct speed.

The machine must not be operated if the boom and attachment motions are jerky or too fast.

Finally, fix the control box in position and install the trim.

Calibration Summary - 838946 Control Box

Calibration Summary - 6R8995 Control Box - (No Auto Height/Auto Reach)
(No Auto Height/Auto Reach)

Calibration Summary - 6R8995 Control Box - (Machines Equipped for Auto Height/Auto Reach Operation)
(Machines Equipped for Auto Height/Auto Reach Operation)

Control Box Fault Code Chart

Fault Finding Guide


NOTICE

Ensure that the start key switch is turned to the OFF position before removing or installing any of the system components


The control box incorporates a fault detection and indication system which can locate problems at start up and during normal operation.

The system indicates an error condition by sounding an audible alarm and flashing a fault indicator lamp on the dashpanel. The nature and possible location of the error is indicated by a coded digital display which is visible through a window in the control box cover. A steady LED display indicates a normal condition. An error condition is indicated by a flashing display. The error code indications are listed in the Control Box Fault Code Charts.

The normal operating display is 0 or 1, depending on whether the machine is being operated in manual mode, or automatic (auto height/auto reach) mode.

The operating mode is selected with the Auto/Manual switch on the dashpanel. Automatic mode will not be displayed unless the machine is equipped with boom angle and length sensors. On such machines the display will be 0 regardless of the Auto/Manual switch position.

A steady 3 display indicates that the control box is not calibrated.

A steady 2 is displayed when calibration mode has been selected. The display will return to 0, 1 or 3 when the calibration switch is returned to the normal operation position.

There are two forms of error indication:

1. Control Box System Error

A rapidly flashing single digit on the display, and a rapid sounding of the alarm. This form indicates errors which are almost certainly located in the control box.

2. Machine Systems Error

A single digit is displayed for approximately 1 second, and after a brief blank display, a second digit is displayed for 1 second. The digits are followed by a blank display for two seconds after which the sequence is repeated. The audible alarm and fault lamp operate at the same time. The rate of operation of the alarms increases with the severity of the error.

This form indicates errors which are almost certainly located in the machine systems or components such as wiring, sensors (if equipped), directional control valve solenoids or boom and attachment controller (joystick).

NOTE: If control boxes or other components are switched between machines for any reason, such as fault elimination for example, the system will very likely show an error code when started up. This is because of slight variations in components. If parts are switched between machines the system must be calibrated before judging the effect of the substitute component. Refer to the component replacement table at the end of this section.

Codes 5, 6, 7, 8, A, b, c and E are internal error codes and indicate control box failure. They could occur at start up or during normal operation, and necessitate replacement of the control box.

Codes d and F can only occur at start up and indicate a short (d to ground or F to battery +) on the boom raise solenoid wiring. The boom raise solenoid output is used to test the operation of an internal relay at power up. The most likely cause is a fault in the wiring or solenoid winding but the problem may be a control box error. The procedure should be to check for short circuits in the wiring or in the boom raise solenoid, and if no short circuit is present, replace the control box. Solenoid resistance should be 5.9 OHMS.

Codes 10 through 17 indicate a problem with the signals the control box is receiving from the boom and attachment controller (joystick). During normal operation the control box monitors the signals from the controller approximately 40 times each second. These signals are compared with either the values stored during calibration - if the control box has been calibrated - or the factory values if the control box is uncalibrated.

The error code indicates which of the four controller axes is at fault, and in which direction it has failed. For example, too low a signal indicates a possible short to ground, if the signal is too high a possible short to battery + is indicated.

If the machine has been calibrated successfully and has operated without problems, these codes indicate a controller failure.

However, if one of these codes has been displayed immediately after calibrating a control box from an unknown state, incorrect controller values may have been recorded due to the controller or pushbuttons not being operated to their full travel. This creates an error display when, in normal operation, the control is moved past the point recorded during calibration.

In this case the controller calibration should be repeated taking care that the controller and pushbuttons are operated to full travel at the relevant times.

If there is a definite fault then the causes could be:-

1. A short to ground or a broken connection in the wiring harness between the controller and the control box. This could be a broken pin in a sureseal connector for example or wire insulation cut through by a sharp edge. Check the wiring associated with the failing axis (the fault code will indicate which wire to check).

NOTE: Make up a break out cable using male and female sureseal connectors wired to a terminal strip to check the controller and main harness. This will allow measurement of voltages to and from the control box.

Typical voltages that can be expected at the sureseal connector pins are shown in the chart.

NOTE: Loss of reference voltage due a faulty thermistor can cause a misleading display of codes 11, 13, 15 and 17 on early machines. See code C0.

2. A faulty boom and attachment controller. Replace the controller and re-calibrate the control box.
3. A faulty control box. Replace the control box and re-calibrate.

Codes 18, 19, 20, 21, 24 and 25 will be displayed only on machines equipped for auto height/auto reach operation and indicate a problem with the sensor wiring/connections or the sensor. Typical voltages and fault finding techniques are the same as the controller. For example, the reference voltage should be 4.95 - 5.05V and the signal out should be in the range 0.5 to 4.75V. Refer to the machine electrical schematic for pin connection numbers.

Codes 28 and 29 refer to the temperature sensor (thermistor) located in the directional control valve. Failure of this component can disable the machine control system by shorting the reference voltage to ground, or change the performance as the hydraulic oil warms up. The sensor should measure around 10K ohms at 25 deg C. See Code C0.

Codes 30 and 31 refer to the circuitry which monitors the machine battery voltage. This is located in the control box, which should therefore be replaced. The only exception is if a 12 Volt machine is being powered or jump started from 24 Volts by mistake.

Codes 40 and 41 will be displayed only on machines equipped for auto height/auto reach operation and indicate a problem with the chassis angle sensor. This should be checked for a bad connection or faulty sensor.

Codes 50 through 53 are caused by the controller being moved in the wrong direction during calibration and apply to early equipment only.

Codes 54, 55 and 57 can be displayed during calibration and indicate that the boom, or the machine angle sensor was moved in the wrong direction.

Codes 61 through 64 indicate a battery voltage problem, either too low or too high for the control system to operate to specification.

If error codes 62 (too low) or 63 (too high) are displayed the system will continue to operate but with impaired performance.

If error codes 61 (very low) or 64 (very high) are displayed, the system will shut down until the battery voltage is restored within the system operating range.

Codes 61 or 62 can be displayed when starting in very cold conditions, or with a battery which has low charge. The display should clear after a few seconds when the engine is operating and the battery is receiving charge. If the display persists check the charging system.

Codes 63 and 64 indicate excessively high battery voltage. Check the charging system. If correct replace the control box.

If any of the codes 61 through 64 are displayed, the battery and charging system should be checked out. Check the battery feed to the control box. A high resistance such as a loose fuseholder, could cause the control box to receive a low voltage. Starting while the battery is on boost charge, or from a 24V jump start would cause the control box to receive a high voltage.

It is possible, but extremely unlikely that the control box itself is incorrectly reading the battery voltage, but if all other possibilities have been checked then the control box should be replaced.

Code 70 indicates a controller problem at power up. The signals received by the control box are outside the calibrated/factory values during power up. See codes 10 through 17 for a more detailed explanation of how the controller and control box are connected.

NOTE: This code was replaced by codes A0 through A7 in later versions of the control box.

Codes 75 through 77 are caused by the controller or machine angle sensor being moved in the wrong direction during calibration.

Codes 80 through 85 indicate a short circuit to ground on one of the directional control valve solenoids or connections. Which solenoid is shorted can be determined by refering to the Fault Code Charts. Solenoid resistance should be 5.9 OHMS. It is possible that the control box is faulty, but the problem is more likely to be external.

Codes 90 through 95 indicate a short circuit on one of the directional control valve solenoids, to battery +. Refer to the fault code charts for more detail.

Code 96 indicates that either the alarm sounder or the fault lamp has an open circuit defect, or is disconnected. This can be confirmed by looking and listening while the alarm is active. If there is an audible alarm but no fault lamp, the lamp or its wiring is faulty. If the lamp is flashing but no audible alarm can be heard, the sounder and its wiring should be checked. This alarm is reset automatically when the fault is corrected. The indication is typically intermittent if the fault lamp is loose in its holder. This indication is also possible if the control box is defective, but this is unlikely.

Code 97 indicates that one of the valve solenoid driver transistors in the control box has failed and the control box must be replaced.

Code 98 indicates that two solenoids are being driven on the directional control valve when only one has been selected. This could be caused by a short circuit in the wiring harness, or a failure in the control box.

Code 99 indicates that both alarm devices (the sounder and the dashpanel fault lamp) have failed.

NOTE: This is a serious error indication and the control box will automatically disable the machine control system until the fault is cleared - see Code 96.

Codes A0 through A4, and A6 indicate controller signal problems at start up. Replaces code 70 in later versions.

NOTE: The signals from the controller do not have to be outside the calibrated/factory values for these codes to occur at start up. Signals which represent a controller function moved away from the HOLD position will trigger the display. The push buttons on the front of the controller are a special case and low voltage failures will give the short to ground codes 15 and 16.

The error code(s) will clear automatically when the signals from the controller are accepted as being within the neutral (HOLD) region. If the machine is started with the controller unintentionally offset, the fault code and alarms will be displayed but will clear when the controller is allowed to move into the HOLD position.

Code c0 indicates short circuited reference voltage. The 5.00 V signal is connected from the control box to the hydraulic oil temperature sender unit (thermistor), the controller and auto height/auto reach sensors (if equipped).

To locate the short, disconnect each of these components in turn until this error code is replaced by a code corresponding to the disconnected sensor. Ensure key switch is turned to the OFF position before disconnecting and connecting components.

Returning a 6R8995 Control Box to an Uncalibrated 'Raw' Condition

If a substitute 6R8995 Control Box has been used on a machine as part of a fault tracing procedure, it must be returned to a 'raw' uncalibrated condition before it is removed from the machine.

Control boxes can only be returned to this condition from a FAILED CALIBRATION CONDITION. (see stage 5 for machines not equipped for auto height/auto reach operation, or stage 8 for machines which are equipped for auto height/auto reach operation).

If the appropriate stage has been reached and the system is signalling 'calibration failed', the control box can be returned to a raw condition by using the following procedure:

1. Press and hold the left side button on the boom and attachment control.

2. Move the calibration switch to normal.

3. Release the left side button.

The control box is now in a raw, uncalibrated condition and will display a '3' in the visual display.

If the control box is signalling 'calibration successful' it must be reverted to a FAILED CALIBRATION CONDITION before carrying out the above procedure. To revert the control box to this condition start the calibration procedure from stage 1. When stage 2 is entered press the right side button on the boom and attachment control to select an incorrect model type. Record the incorrect selection as detailed in Step 3., and then step forward through the calibration stages by pressing the right side button on the boom and attachment control until the appropriate stage is reached (5 or 8), and the system indicates CALIBRATION FAILED. Now carry out the above procedure to return the control box to a raw condition.

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