Procedure to Update the Cab Wiring Group on Certain 773E and 777D Off-Highway Trucks{1408, 7301} Caterpillar

Off-Highway Truck/Tractor:

773E (S/N: ASK1-UP)

777D (S/N: FKR1-UP)

Introduction

This special instruction contains the information required to update the cab wiring group. This procedure will improve the service life of the rocker switch located in the cab door.

Required Parts

Important Safety Information

Do not perform any procedure in this special instruction until you have read this special instruction and you understand this information. Use only proper tools and observe all precautions that pertain to the use of those tools. Failure to follow these procedures can result in personal injury. The following procedures should also be observed.

Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs.

A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools in order to perform these functions properly.

Safety precautions and warnings are provided in this instruction and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard.

Therefore, the warnings in this publication and the warnings that are on the product are not all inclusive. If the tools, the procedure, the work method, or your actions are not recommended by Caterpillar, ensure that the tools and your actions are safe for you and for others.

Ensure that the product will not be damaged or the product will be made unsafe by the operation, lubrication, maintenance, or the repair procedures.

Follow all safety warnings. Most accidents that involve product operation, maintenance, or repair are caused by failure to observe safety warnings. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. Personnel should be properly trained in order to perform maintenance, repair, or operate any machine. Safety precautions and warnings are provided this instruction and on Caterpillar products. These warnings should be observed before performing any procedures. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard. The warnings in this publication and on the product are not all inclusive.

The hazards are identified by the "Safety Alert Symbol" which is followed by a "Signal Word" such as "DANGER", "WARNING" or "CAUTION". The "WARNING" Safety Alert Symbol is shown in Illustration 1.

Illustration 1	g00008666

This safety alert symbol means:

Pay Attention!

Become Alert!

Your Safety is Involved.

The message that appears under the safety alert symbol explains the hazard.

Operations that may cause product damage are identified by "NOTICE" labels on the product and in this publication.

The information, the specifications, and the illustrations that exist in this guideline are based on information which was available at the time of publication. The specifications, torques, pressures, measurements, adjustments, illustrations, and other items can change at any time. These changes can affect the service that is given to the product. Obtain the complete, most current information before you start any job. Caterpillar dealers can supply the most current information.

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Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine. To prevent personal injury or death, perform the following: Park the machine on a smooth, level surface. Lower the work tool to the ground and engage the parking brake. Stop the engine and remove the key. Block the wheels and install the steering frame lock.

Update Procedure

1. Prepare the machine for service.

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Illustration 2	g03744839

2. Access the rear of the cab, and drill a 20.5 mm (0.80708 inch) above the existing hole. Refer to Illustration 2.

   Note: Ensure that there are no sharp edges on the new hole.

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Illustration 3	g03745153

3. Install plate assembly (1) to the rear of the cab using two screws (2) and two hard washers (3), as indicated in Illustration 3.

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Illustration 4	g03745182

4. Install two relays (4) to plate assembly (1) using two screws (5) .

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Illustration 5	g03745203

5. Connect cab harness assembly (6) to two relays (4) .

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Illustration 6	g03745219

6. Install clip (7) to the air tank supporting plate, and secure cab harness assembly (6) to clip (7) with one cable strap (8) .

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Illustration 7	g03745288

7. Remove the existing 139-0673 Cab Harness As .

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Illustration 8	g03745311

8. Connect the jumper harness from cab harness assembly (6) to the cab harness assembly that was disconnected in Step 7.

9. Connect the jumper harness from cab harness assembly (6) to the power window harness.

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Illustration 9	g03745382

10. Route and secure cab harness assembly (6) with nine cable straps (8) .

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Illustration 10	g03748871

11. Secure cab harness assembly (6) with four cable straps (8) .

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Illustration 11	g03745409

12. Route cab harness assembly (6) through the hole with one grommet (9) .

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Illustration 12	g03745584

13. Remove the left side interior door panel. Remove the existing harness assembly and grommet, and route cab harness assembly (6) through the opening, secure in place with grommet (10) .

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Illustration 13	g03745659

14. Connect cab harness assembly (6) JP-C6 to power window harness CM-C2. Connect cab harness assembly (6) JP-C2 to power window harness CM-C1.

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Illustration 14	g03748793

15. Secure cab harness assembly (6) with four cable straps (8) .

16. Key on the machine and verify proper window operation.

17. Install the left door cover and the cab rear back cover.