2008/09/01 Caterpillar

Off-Highway Truck:

797B (S/N: JSM1-UP)

Description of Change: The hydraulic hose for the steering cylinder has been rerouted. An improved location for clipping is used in order to reroute the hydraulic hose for the steering cylinder. The new routing of the hose for the steering cylinder will reduce the amount of wear that is on the hose that is caused by rubbing against the rails for the engine mounting group.

Adaptable To: The 156-4026 Hose As is rerouted in order to avoid excessive rubbing from the rails for the engine mounting group. The new routing of the hose includes the use of the following new parts:

• Two 9R-2613 Weld Bosses

• Two 8T-4121 Hard Washers

• Four 8T-4196 Bolts

The improved location for clipping and rerouting of the steering hose is effective with (S/N: JSM365-UP).

Installation Procedure

Show/hide table

Personal injury can result from flame cutting or welding on painted areas. The effect of gasses from burned paint is a hazard to the person doing the cutting or welding. Do not flame cut or weld on painted areas.

Show/hide table

Personal injury or death can result from fumes, gases and ultraviolet rays from the weld arc. Welding can cause fumes, burn skin and produce ultraviolet rays. Keep your head out of the fumes. Use ventilation, exhaust at the arc, or both, to keep fumes and gases from your breathing area. Wear eye, ear and body protection before working. Protect yourself and others; read and understand this warning. Fumes and gases can be dangerous to your health. Ultraviolet rays from the weld arc can injure eyes and burn skin. Electric shock can cause death. Read and understand the manufacturer's instructions and your employer's safety practices. Do not touch live electrical parts. See "American National Standard Z49.1, Safety in Welding and Cutting" published by the American Welding Society. American Welding Society 2501 N.W. 7th Street Miami, Florida 33125 See "OSHA Safety and Health Standards, 29 CFR 1910", available from U.S. Department of Labor. U.S. Department of Labor Washington, D.C. 20210

Note: Refer to Special Instruction, REHS1841, "General Welding Procedures" for all necessary information on all welding procedures.

Show/hide table



Illustration 1	g01627991
Exploded view of the clip and block

Show/hide table



Illustration 2	g01627905
Bottom View

1. Remove block (A), clip (B), grommet (C), clip (D), washer (E), and bolt (F). Keep clip (B), grommet (C), and clip (D). Clip (B), grommet (C), and clip (D) will be reused. Discard block (A), washer (E), and bolt (F). Block (A), washer (E), and bolt (F) will not be reused.

2. Prepare all the welding areas for welding. All weld joints and welding areas must be exceptionally clean. Clean the welding area with hand grinder (BB). Completely remove all paint, rust, scale, slag, dirt, moisture, grease, etc before welding.

Show/hide table



Illustration 3	g01627429
Right Side View (AA) 800 mm (31.5 inch)

Show/hide table



Illustration 4	g01627405
Bottom View (AA) 800 mm (31.5 inch) (AB) 101.6 mm (4 inch)

3. Position bosses (1) according to the dimensions that are given in Illustration 3 and Illustration 4.

Show/hide table



Illustration 5	g01628996
(1) 9R-2613 Weld Boss (W1) 4 mm (0.158 inch) all around fillet weld

4. Weld bosses (1) to the rails for the engine mounting group.

Show/hide table



Illustration 6	g01627997
Exploded view of the clip and boss

Show/hide table



Illustration 7	g01627956
Bottom View

5. Secure the hose to boss (1) with bolt (3), hard washer (2), clip (D), grommet (C), and clip (B) .

   Note: Clip (D), grommet (C), and clip (B) were removed in Step 1.

6. Use a grinder in order to grind all the welds flush. Completely remove all rust, scale, slag, dirt, moisture, etc before painting.

7. As needed, repaint the affected area.