- Off-Highway Truck/Tractor:
- 789D (S/N: SPD1-UP; SHH1-UP)
Description of Change: The bracket that holds the mud flap under the cab has been updated to withstand excessive weight from a buildup of mud.
Adaptable To: For trucks with 345-8388 Handrail Gp, a new bracket can be fabricated to provide additional support to the existing metallic mud flap. Trucks without this handrail group are not affected by this issue. The updated mud flap bracket is adaptable and effective in production with the machines that are listed in Table 1.
| Sales Model | Adaptable to Machines | Effective in Production Machines |
| 789D | S/N:SPD1-640 | S/N:SPD641-UP |
| 789D XQ | S/N:SHH1-319 | S/N:SHH320-UP |
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.
 |
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. |
 |
Required Parts
| Required Parts | |||
| Item | Qty | Part Number | Description |
| 1 (1) | 1 | N/A | Bracket |
| 2 | 3 | 8T-4121 | Hard Washer |
| 3 | 3 | 8T-4195 | Bolt |
| 4 | 3 | 8T-4133 | Nut |
| 5 | 4 | 8T-4956 | Bolt |
| ( 1 ) | This bracket is fabricated. |
Mud Flap Update Procedure
- Modify the existing plate (A) by drilling three holes (B) in the locations shown in Illustration 6.
 | |
| Illustration 2 | g03691640 |
View of 349-3394 Plate (A) with added holes. (A) 349-3394 Plate (B) 13.5 mm (0.532 inch) hole, QTY of 3 (C) 569.7 mm (22.429 inch) (D) 444.8 mm (17.512 inch) (E) 319.9 mm (12.594 inch) (F) 196.3 mm (7.728 inch) (G) 352.5 mm (13.878 inch) (H) 508.7 mm (20.028 inch) | |
- Fabricate bracket (1) as shown in Illustration 3, Illustration, and4 Illustration 5.
 | |
| Illustration 3 | g03692432 |
 | |
| Illustration 4 | g03692473 |
 | |
| Illustration 5 | g03692543 |
- Secure bracket (1) to the updated plate (A) using the following hardware:
 | |
| Illustration 6 | g03691728 |
View of bracket (1) secured to plate (A) (1) 451-5960 Bracket (2) 8T-4121 Hard Washer (3) 8T-4195 Bolt (4) 8T-4133 Nut (A) 349-3394 Plate | |
- Replace the four existing bolts that are highlighted in red in Illustration 6 with bolts (5) .
 | |
| Illustration 7 | g03691748 |
(5) 8T-4956 Bolt | |