Installation Of An Automatic Retarder System{3100} Caterpillar

Installation Of An Automatic Retarder System{3100}

Usage:

785 (8GB)

Introduction

This Special Instruction will supply the necessary information to install an Automatic Retarder System (ARC) on a 785 Truck with a Manual Unit Injection (MUI) engine or a truck which has been retrofitted with an Electronic Unit Injection (EUI) engine conversion. THIS INSTRUCTION SHOULD BE KEPT WITH THE TRUCK. The parts and assembly procedure will not be available in any other publication.

Do not perform any procedure outlined in this publication, or order any parts, until you read and understand the information contained within.

NOTE: Make sure to purchase the parts for your truck only. Carefully read the NOTES following the parts list.

NOTE: If both the EUI Conversion and ARC is to be installed, the EUI Conversion must be done first. It is important to keep the ARC box coded properly based upon engine style and transmission control box. During EUI conversion, a new transmission control box (EPTC-II) is installed. It is necessary for specific coding of the ARC control box to reflect these changes.

Reference: SEBP1491 785 Parts Book, SEHS9065 Use of CE Connector Tools, SEHS8038 Use of 6V4810 VE Connector Tool Group, SEHS8863 Installation of 8W7507 Off-Highway Truck Engine Overspeed Warning Indicator Group and SENR5683 Automatic Retarder Control System Service Manual.

Necessary Parts

MUI ENgine Trucks

Section 1 - Cab Preparation

Front of Cab

View A-A, See Control Box Location. Detail B, See ARC Valve Group Mounting Location. View C-C, See Weld Lug For Valve Group-Check Mounting (Reference 2A6518 Retarder Control Group).

ARC Valve Group Mounting Location

Install 6K7954 Bar to the left INSIDE wall of the front of the cab. Weld the bar with a 3.0 mm (.12 in) fillet weld at location (A), BOTH SIDES, to the dimension shown in the illustration.

Install 8F9836 Lug to the left side of the steering column on the dash assembly. Weld the boss with a 3.0 mm (.12 in) fillet weld at location (B), ALL AROUND, to the dimension shown above.

Rear of Cab

The ARC control box is mounted in the rear of the cab. Its location varies depending upon the truck's configuration and existing control boxes. Determine which of the following mounting locations is applicable.

006

Control Box Location

Install four 8J4917 Bosses to support the mounting plates of the ARC box and one 8J4917 Boss for clipping of the ARC Harness as shown in the illustration. Weld the bosses with a 3.0 mm (.12 in) fillet weld at location (C), ALL AROUND, 5 PLACES.

006

Control Box Location

Install four 8J4917 Bosses to support the mounting plates of the ARC box as shown in the illustration. A fifth boss may be added where necessary to support the harness assembly. Weld the bosses with a 3.0 mm (.12 in) fillet weld at location (C) ALL AROUND 4 OR 5 PLACES.

This will place the ARC control box to the right of the payload box and/or ether control box (which are stacked when both exist).

Section 2 - Cab Front Modifications

Air System

The existing control group-service brake will be modified.

5T0851 Control Group-Brake (Remove only item 6 and 7)

Remove 7D6096 Hose Assembly (Item 6) and 3D7587 Elbow (Item 7) from 5T0851 Brake Control Group.

Install the following parts using 2A6518 Retarder Control Group as a reference.

2A6518 Retarder Control Group (For Reference Only)

3E8978 Valve Group

NOTE: Use hardened washers to stand-off from the valve mounting plate to relieve the stress on the valve body.

Mount valve group as shown, securing two 9G9150 Clips for the sure seal connections of the solenoids.

Cab Wiring

009

1047117 Harness Assembly

The ARC retrofit harness is used whether updating a truck which has been converted to an EUI engine or retaining an existing MUI engine. Certain connections will be made depending upon the type of engine.

The following paragraphs will explain the procedure for cab wiring based upon the truck configuration. Certain series are isolated on MUI trucks because the engine overspeed system must be installed on those trucks which were not factory equipped with the overspeed system.

NOTE: Trucks with PIN 8GB1-236 were not equipped with an engine overspeed system. To make the ARC system functional, these trucks must be updated with SEHS8863 Installation of 8W7507 Off-Highway Truck Engine Overspeed Warning Indicator Group. This addition will be discussed in more detail later in this instruction.

Instrument Panel Connection

Existing

Retrofit

Disconnect the existing connections on the retarding lamp (454-GN and 123-WH). Wrap and tie back these wires to avoid shorting. Connect the ARC retro harness 454-GN and 202-BK leads to the retarding lamp.

8W0584 Wiring Group (For Reference Only)

Retrofit

Disconnect 454-GN and 200-BK from the existing manual retarder switch (Reference 8W0584 Wiring Group). Wrap and tie back these wires to avoid shorting. Connect the ARC retro harness D992-PU and 202-BK to the manual retarder switch.

Connect the ARC retro harness D991-OR and 202-BK leads to the 9W0263 Auto Retard Switch Assembly which is part of the 3E8978 Valve Group.

Connect the ARC retro harness two pin sure seal breakout marked #1 to the 3E8691 number 1 supply shutoff valve group which is part of the 3E8978 Valve Group. Place the connection into the 9G9150 Sure Seal Clip.

Connect the ARC retro harness two pin sure seal breakout marked #2 to the 3E8691 number 2 pressure control valve group which is part of the 3E8978 Valve Group. Place the connection into the 9G9150 Sure Seal Clip.

009

The above trucks were not equipped with an engine overspeed system. To make the ARC system functional, these trucks must be updated with parts of SEHS8863 Installation of 8W7507 Off-Highway Truck Engine Overspeed Warning Indicator Group.

Turn to SEHS8863 Supplement and perform the Steps provided. These steps may have already been completed.

When the engine overspeed has been installed, continue with the following Steps to deliver power to the engine (450-YL) speed pickup and engine oil pressure (405-GY).

1049532 Harness Assembly

8W0642 Harness Assembly (Cab)

Splice into the main cab harness (Reference 8W0642) with 1049532 Harness Assembly to the main cab harness wires 405-GY and 450-YL. Connect this splicing harness to the ARC retro harness at the two pin sure seal which contain these wires.

010

1031227 Harness Assembly

The 785 (8GB237-Up) was equipped with engine overspeed from the factory. A tee jumper harness will be inserted between the main cab harness breakout for engine overspeed and the overspeed harness.

8W8223 Harness Assembly (Cab)

Disconnect the overspeed harness (Reference 8W7193) from the main cab harness (Reference 8W8223). Insert 1031227 Tee Jumper Harness which makes a through connection back to these breakouts.

This provides a two pin sure seal breakout containing the 450-YL and 405-GY wires. Connect this two pin sure seal connection to the ARC retro harness at the two pin sure seal which contains these wires.

Section 3 - Cab Rear Modifications

Cab Wiring

012

The remainder of the ARC retro harness should be channeled under the cab through the tunnel to the rear of the cab where connections will be made to the ARC fuse, arc control box, service set and service clear switches, data link, code plug, throttle switch (conditional connections to the secondary brake switch) along with a breakout to the console area to be connected to the ARC on/off switch. The cover over the tunnel may be removed for easier access.

Those necessary connections which will be based upon truck engine configuration and/or truck PIN, will be clearly noted.

Install a fuse holder on the rear circuit panel. An existing empty position may be used or a new location may be made. See illustration for fuse holder cut out dimensions.

Install 4K5122 Fuse Holder and 3K8782 Fuse and label it as Automatic Retarder fuse.

Connect 176-OR and 112-PU wire of 1047117 ARC Retro Harness to the fuse as shown above.

Connect 112-PU wire to the main relay.

Connect 202-BK wire to the ground boss at the rear of the cab. It is important to connect this wire to the ground boss provided for this purpose.

012

8W0584 Wiring Group-Cab (Reference Only)

Connect 720-PU wire of the ARC retro harness to the secondary brake switch terminal which has this same coded and colored wire connected to it.

NOTE: This connection is made to a MUI truck with the older transmission box control box (7T9967, 7X1066, 7X1989 or 7X6186).

Trucks with the new Electronic Programable Transmission Control II (EPTC-II) receive this signal over the Data Link. The new transmission control boxes can be identified by having a ten pin sure seal breakout located near the main connector.

Show/hide table

NOTICE

If an EPTC-II control box is sent as a service replacement for an EPTC box, this box must be connected as if it was an EPTC box. The data link capabilities of an EPTC-II box are not functional until the EPTC-II retrofit for a MUI truck has been completed. Refer to SEHS9624 EPTC-II Retrofit To A MUI Truck.

012

Wrap and tie back the 720-PU wire of the ARC retro harness. This wire is not used because the information is supplied through the data link from the transmission control box.

012

A switch must be mounted in the governor air system to provide a throttle signal to the ARC control box.

5T0853 Governor Control Group (8GB1-418) Reference Only

Remove 3D7587 Elbow from 9M8662 Coupling at port 6 of the cab wall plate (reference 7D3494 Hose in 5T0853 Governor Control Group).

Part 1 of 2, 5T0853 Governor Control Group (8GB419-Up) Reference Only

Part 2 of 2, 5T0853 Governor Control Group (Reference Only)

Remove 3D7587 Elbow from 9M8662 Coupling at port 6 of the cab wall plate (reference 4D7928 Hose in 5T0853 Governor Control Group).

Install 2D7325 Tee in the coupling.

Connect 7D3494 (or 4D7928) Hose to the tee.

Install 9W0263 Switch in the tee.

Connect D987-GY and 202-BK wires of the ARC retro harness to the switch.

012

1049564 Harness Assembly

A service tool connection is provided through a 1049564 Harness Assembly. This harness assembly has two data link connectors, one is plugged into the ARC retro harness assembly.

Remove 7N9737 Housing Plugs from one of the data link connectors of 1049564 Harness Assembly. Connect this to the ARC retro harness data link connector and clip with a 3T3048 Clip Assembly. Clip other plugged and unused data link connector of 1049564 Harness Assembly with 3T3048 Clip Assembly.

The service tool connector of the 1049564 Harness Assembly should be located behind the drivers seat near the diagnostic connector.

As Seen From The Cab

Installation dimensions and location of the connector can be found on the illustrations above.

The service tool connector can be installed and capped with the following items:

* 4-6D3033 Screws

* 4-6V9497 Washer

* 4-6B4540 Nuts

* 1-8C6354 Cap

Connect 105-BR wire from 1049564 Harness Assembly to the 105-BR side of the key switch breaker, located in the circuit panel. Connect 201-BK wire ring terminal to the cab ground boss.

012

The service tool connection, 1049654 Harness Assembly, was provided as a part of the EPTC-II retrofit for MUI trucks. This harness assembly has two data link connectors. One connector is plugged into the ARC retro harness assembly and the other was connected to the EPTC-II data link during the EPTC-II retrofit for MUI trucks.

Remove the 7N9737 Housing plug from the data link connector and join the ARC retro harness to the existing 1049654 Harness Assembly. Secure this joint with existing 3T3048 Sure Seal Clip.

012

The location for the ARC control box was determined earlier in this publication.

Place 3E9028 Film on 1051888 ARC Control Box. Mount the control box and 2A7121 Plate to 8X3706 Plate. Clip service set and service clear switch breakout to 8X3706 Plate with a 4D7794 Clip. Secure ARC retrofit harness assembly to weld boss with 5M3062 Bolt, 8T4896 Washer and 8M2773 Clip.

Connect D993-YL, D994-BU and the two 202-BK leads to the 9D3721 Service Set and Service Clear Switches near the box.

Fasten the main connector to the control box. Fasten the 10 pin sure seal to the control box and secure with a 3T3046 Clip Assembly. Secure the sure seal to the main connector with a 3S2093 Strap.

012

A code plug must be installed at the 6 pin connector sure seal of the ARC retro harness assembly. This plug will identify the truck to the ARC box. This plug must match the configuration of the truck.

* 1054782 Harness Assembly is used for 785 with MUI engine and EPTC (or transmission control box EPTC-II with data link capabilities inactive).

* 1054779 Harness Assembly is used for 785 with MUI engine and EPTC-II (with data link capabilities activated).

Install the proper code plug and secure with a 3T3047 Clip Assembly.

The long breakout with D984-GN, D985-BR, D986-PK and two 202-BK wires must be inserted through the dividing wall (use 3P9554 Grommet) and run through the console up to the console panel area directly above the transmission control box. This breakout will be connected to the ARC on/off switch.

Section 4 - Cab Console Modifications

Cab Wiring

014

Remove 5T8566 Panel from the console above the transmission control box.

Make the opening for the ARC on/off rocker switch using the dimensions shown above.

Connect D985-BR to pole 1, D986-PK to pole 3 and one 202-BK wires to pole 2 of 6T3991 Switch. Individually wrap and tie back the remaining D984-GN and 202-BK wires. These two wires are currently not used.

Install 6T3991 Switch (1) to the panel with:

* 1-1029077 Film (2)

* 2-6V8927 Bolts (3)

* 1-6T6329 Bezel (4)

Connect the batteries.

Paint all area's that were welded.

Install all panels that were removed.

Check the truck for proper operation. See SENR5683 Automatic Retarder Control System.

SEHS8863 SUPPLEMENT (Reference)

* Disconnect the batteries.

* Remove the cover from the front of the cab.

* Remove the instrument panel and the plastic dash. See the Service Manual for correct procedure.

1. Install three 9D8514 Bosses (1) on the back of the dash assembly at the dimensions and make a 3.0 mm (.12 in) fillet weld ALL AROUND.

View From Inside Cab.

2. Drill a 15 mm (.6 in) diameter hole (A) at the dimensions shown

3. Cut opening (B) at the dimensions shown with a 3.0 mm (.12 in) radius at each corner.

4. Install 8F9836 Lug (2) at the dimensions shown, on the left side of the steering tunnel on the dash assembly. This lug will be used to mount the 9G9813 Alarm Group.

5. Drill three holes (C), (D), and (E) at the dimensions shown in the plastic dash.

* Hole (C)- 3.5 mm (.14 in) diameter.

* Hole (C) is 9.5 mm (.37 in) up from center-line of hole (D).

* Hole (D)- 12.5 mm (.50 in) diameter.

* Hole (E)- 26 mm (1.02 in) diameter.

6. Install the plastic dash.

Modification of Instrument Panel

1. Install 8W7960 Harness Assembly (1), connect 451-BR wire (2) and 450-YL wire (3) with 2L8065 terminals (4) to the existing brown and yellow wires. Install heat shrink tubing over each connection.

2. If the vehicle is equipped with a electronic tachometer, connect the wires. If not, tape the wires down against the existing harness.

NOTE: To eliminate a short in the circuit, terminals (4) must not touch each other.

3. Connect 123-WH wire (5) from harness assembly (1) to existing white wire (6) with a 2L8064 Terminal (7). Install heat shrink tubing over the connection.

4. Connect the white wires to the speedometer at location (A).

5. Install the instrument panel into the dash.

6. Install two 7T1874 Terminals on 3T0304 Indicator Light Base (8) and two 7N8419 Terminals on 9D3721 Toggle Switch (9).

7. Install 8C7535 Film (10), toggle switch (9) and indicator light (8) with 7N1996 Lamp and 6T7058 Lens in the dash as shown.

8. Install 9G9813 Alarm Group (11) with 0S0509 Bolt and 5M2894 Washer (12) as shown.

9. Put the wires from the alarm group through the hole drilled earlier in the dash and install a 4V5091 Grommet (13).

10. Install 7T3821 Control Assembly (14) with three 4M5282 Bolts and 5P4115 Washers.

11. Put 8W7508 Harness Assembly (15) in position in the front of the cab as shown. Connect it to 8W7960 Harness Assembly and secure the connection with 9G9152 Clip.

12. Join connectors (16) to control group (14) connector and secure with two 3T0050 Clips (17), existing bolt and washer.

13. Join connector (18) to alarm group (11) connector and secure with a 9G9150 Clip (19), existing bolt and washer.

14. Using clip (20), connect ground wire (21) as shown.

15. Carefully cut into existing main cab wiring harness (22) and pull out the gray wire (405B), splice gray wire (23) 405B from the 8W7508 Harness Assembly to the gray wire removed from wiring harness (22).

16. Connect the 8W7508 Harness Assembly to 8W7960 Harness Assembly installed earlier on the instrument panel with a 3T3045 Clip.

17. Secure the wires.

18. Connect orange wire (918C) and black wire (200G) to indicator light (8). Connect black wire (200H) and green wire (919B) to toggle switch (9).

19. Install plastic ties as necessary. Install the front cover.

20. At rear of the engine on the bell housing, remove plug (24).

21. Install 9X5393 Magnetic Sensor (25). Pull the end of the sensor out as far as possible before installing it into the housing. Install the sensor into the housing until it touches the top of a gear tooth and tighten locknut (26).

22. Connect wire (27) to the existing wire on the vehicle with a 3T3048 Clip (28) as shown.

Operation and Test

Normal Operation

When the vehicle key is turned to "RUN" or "START", the engine overspeed indicator should power up. The "RED" lamp will flash rapidly, not longer than two seconds. During this time the control module is testing itself internally. After this test, all four lamps will light for four seconds. This is known as the "LAMP TEST". When the lamp test is completed, the indicator goes into "Normal Mode".

Normal Mode Operation

During normal mode operation the system will continuously monitor the engine speed sensor, the oil pressure switch, test switch and the vehicle harness code. No alarm is sounded in this mode. The system changes from this mode during one of the following conditions:

1. If engine speed exceeds the defined limit (see Harness Code Identification) the system enters "ALARM MODE".

2. If the test button is depressed the system enters "TEST MODE".

3. If an invalid harness code exists the system enters "FAULT MODE".

4. If the oil pressure switch has been closed for five seconds and no engine speed signal is present, the control enters "FAULT MODE".

Alarm Mode

In alarm mode, the warning alarm should produce a steady tone and the warning lamp will light.

* Lamp # 1, Lamp # 2 and Lamp # 3 should be "ON".

* Lamp # 4 should be "OFF".

The system will remain in alarm mode until the engine speed is reduced below the defined value to terminate alarm mode (see Harness Code Identification).

Test Mode

In test mode, the warning alarm should produce a steady tone and the warning lamp will light. Lamp # 2 will be "ON". Lamp # 4 should be "OFF". Lamps # 1 and # 3 may be "ON" or "OFF", depending on engine speed and oil pressure. The system will remain in test mode until the test button is released or the system is forced into alarm mode by high engine speed.

Fault Mode

In fault mode, the warning alarm will sound "two beeps" every two seconds and the warning lamp will flash two times every two seconds.

* If Lamps # 2, 3 and 4 are flashing once per second, the vehicle harness code is invalid. The system will remain in this mode until a valid vehicle harness code is present.

* If no lamps are flashing, the engine speed sensor or harness is defective. This can be verified by checking Lamp # 1. Lamp # 1 will be "OFF" if no speed signal is present or if the engine is not operating.

Setting The Defined Alarm Speed

In Case of Difficulty

The Engine Overspeed Control is equipped with diagnostic lamps to provide assistance with system troubleshooting. The lamps are arranged as given below. The functions are as follows:

Lamp # 1 - Green

When "ON" or flashing: indicates the presence of an engine speed signal (except during a lamp test or harness code fault).

Lamp # 2 - Green

When "ON": indicates that the alarm and lamp have been activated (except during a lamp test or harness code fault).

Lamp # 3 - Green

When "ON": indicates that the engine oil pressure switch is closed (except during a lamp test or harness code fault).

Lamp # 4 - Red

When flashing rapidly for an extended period: indicates that the control has diagnosed an internal problem. The control should be replaced. It is normal for this lamp to flash briefly (less than two seconds) when the control is first powered up. It may also flash once per second if a harness fault is detected.

End of SEHS8863 Supplement

EUI Converted Engine Trucks

Section 1 - Cab Preparation

Front of Cab

View A-A, See Control Box Location. Detail B, See ARC Valve Group Mounting Location. View C-C, See Weld Lug For Valve Group-Check Mounting (Reference 2A6518 Retarder Control Group).

ARC Valve Group Mounting Location

Install 6K7954 Bar to the left INSIDE wall of the front of the cab. Weld the bar with a 3.0 mm (.12 in) fillet weld at location (A), BOTH SIDES, to the dimension shown in the illustration.

Install 8F9836 Lug to the left side of the steering column on the dash assembly. Weld the boss with a 3.0 mm (.12 in) fillet weld at location (B), ALL AROUND, to the dimension shown above.

Rear of Cab

The ARC control box is mounted in the rear of the cab. Its location varies depending upon the trucks configuration and existing control boxes. Determine which of the following mounting locations is applicable.

032

For those trucks which have payload monitoring, it is recommended that the payload control box be moved to allow the location of the ARC control box to the left of the payload box.

This room is available because one of the air tanks was removed (used with the MUI governor control group) during the EUI retrofit conversion.

Install eight 8J4917 Bosses to support the mounting plates of the ARC box and one boss for clipping of the ARC harness as shown in the illustration. Weld the bosses with a 3.0 mm (.12 in) fillet weld at location (D), ALL AROUND, 9 PLACES.

Section 2 - Cab Front Modifications

Air System

The existing control group-service brake will be modified.

5T0851 Control Group-Brake (Remove only item 6 and 7)

Remove 7D6096 Hose Assembly (Item 6) and 3D7587 Elbow (Item 7) from 5T0851 Brake Control Group.

Install the following parts using 2A6518 Retarder Control Group as a reference.

2A6518 Retarder Control Group (For Reference Only)

3E8978 Valve Group

NOTE: Use hardened washers to stand-off valve from the mounting plate to relieve the stress on the valve body.

Mount the valve group as shown, securing two 9G9150 Clips for the sure seal connections of the solenoids.

Cab Wiring

035

1047117 Harness Assembly

The ARC retro harness is used whether updating a truck which has been converted to an EUI engine or retaining an existing MUI engine. Certain connections will be made depending upon the type of engine.

The following paragraphs will explain the procedure for cab wiring based upon the truck configuration.

Instrument Panel Connection

Existing

Retrofit

8W0584 Wiring Group (For Reference Only)

Connect the ARC retro harness D991-OR and 202-BK leads to the 9W0263 Auto Retard Switch Assembly which is part of the 3E8978 Valve Group.

035

EUI trucks do not need the engine overspeed control group since this function is handled by the engine electronic control module. An over speed warning lamp is still necessary. During the EUI conversion process, this warning lamp was installed and necessary modifications were made concerning the overspeed system (See SEHS955 4 Cab and Chassis EUI Retrofit).

When a truck has been converted to an EUI engine, the 405-GY (engine oil pressure) wire circuit is powered by the engine control box through the EUI retro harness assembly. Therefore, only the 450-YL (engine speed) wire of the ARC retro harness needs to be connected to the system.

This connection is now made through the EUI retro harness by connecting the two pin (450-YL and 405-GY) sure seal of the ARC retro harness to a two pin (450-YL only) sure seal connector of the EUI retro harness. Refer to SEHS9554 Cab And Chassis Electronic Unit Injector Retrofit.

NOTE: If the EUI conversion process is being made after an ARC retrofit, follow all instructions concerning the EUI conversion. Make sure the final connection of the ARC retro system follows those instructions discussed for EUI trucks in this publication.

Section 3 - Cab Rear Modifications

Cab Wiring

037

The remainder of the ARC retro harness should be channeled under the cab through the tunnel to the rear of the cab where connections will be made to the ARC fuse, arc control box, service set and service clear switches, data link, code plug along with a breakout to the console area to be connected to the ARC on/off switch. The secondary brake and throttle switch connections are not used. The cover over the tunnel may be removed for easier access.

Those necessary connections which will be based upon truck engine configuration and/or truck PIN, will be clearly noted.

Install a fuse holder on the rear circuit panel. An existing empty position may be used or a new location may be made. See illustration for fuse holder cut out dimensions.

Install 4K5122 Fuse Holder and 3K8782 Fuse and label it as Automatic Retarder fuse.

Connect 176-OR and 112-PU wire of 1047117 ARC Retro Harness to the fuse as shown above.

Connect 112-PU wire to the main relay.

Connect 202-BK wire to the ground boss at the rear of the cab. It is important to connect this wire to the ground boss provided for this purpose.

037

Wrap and tie back the 720-PU wire of the ARC retro harness. This wire is not used because the information is supplied through the data link from the EPTC-II transmission control box.

037

Wrap and tie back D987-GY and 202-BK wires of the ARC retro harness. These wires are not used as the information is carried over the data link connection made to the EUI retrofit cab harness which serves as a link between the ARC and the EUI electronic throttle sensor located on the throttle pedal.

037

These trucks have been supplied with a service tool connector which is part of a panel group located on the console. To make the connection with the EUI and EPTC-II data link, connect the ARC retro data link breakout with an unused (plugged) breakout on the EUI retro harness assembly. (Reference SEHS9562)

Remove plug housing and secure this data link connection using existing 3T3048 in line sure seal clip.

037

The location for the ARC control box was determined earlier in this publication.

Connect D993-YL, D994-BU and the two 202-BK leads to the 9D3721 Service Set and Service Clear Switches near the box.

Fasten the main connector to the control box. Fasten the 10 pin sure seal to the control box and secure with a 3T3046 Clip Assembly. Secure the sure seal to the main connector with a 3S2093 Strap.

037

* 7I4732 Harness Assembly is used for 785 with EUI retrofit engine and EPTC-II (with data link capabilities).

Install the proper code plug and secure with a 3T3047 Clip Assembly.

Section 4 - Cab Console Modifications

Cab Wiring

039

The 5T8566 Console Panel located above the transmission control box was replaced when the EUI retro main cab harness was installed. This panel has other switches, lamps and service tool connector located on it. It is equipped with a dummy bezel and ready to accept the ARC on/off switch. The included film is also equipped with the ARC on/off pictograph symbol.