621H, 623H and 627H Wheel Tractor-Scrapers Engine Supplement Caterpillar

Removal Procedure

1. If reusing the exhaust elbow, and or the bellows, refer to Special Instruction, REHS5014, "Reuse Guideline for the Lines Group - Flexpipe on Tier 4 Engines".

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Illustration 1	g02640736

2. Remove panel assembly (1) .

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Illustration 2	g02640737

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Illustration 3	g02640738

3. Loosen clamp assemblies (4) , (6) , and (8) .

   Note: Mark the orientation of clamp assembly (4) prior to removal.

4. Slide elbow (7) into bellows assembly (5) to gain clearance. Remove bellows assembly (5) .

5. Loosen clamp assembly (2) and remove tube assembly (3) .

Installation Procedure

1. If reusing the exhaust elbow, and or the bellows, refer to Special Instruction, REHS5014, "Reuse Guideline for the Lines Group - Flexpipe on Tier 4 Engines".

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Illustration 4	g02640837

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Illustration 5	g02640839
Alignment Wrap (A) is not shown for photographic purposes. Typical Example

Note: Alignment Wrap (A) will be included with the new bellows assembly. The Tooling will be pre-installed on the bellows.

Note: The Alignment Wrap (A) should not be removed until Step 12. Bellows assembly (5) should never be flexed during installation.

2. Place Mark (B) onto elbow (7) . Mark (B) should be a distance of Dimension (X) from the end of elbow (7) . Dimension (X) is 40 mm (1.6 inch).

3. Insert elbow (7) into bellows assembly (5) . Elbow (7) should be inserted as far as possible without using force. This action will minimize the overall length of the bellows assembly and will help with installation.

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Illustration 6	g02640737
Alignment wrap (A) is not shown for photographic purposes.

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Illustration 7	g02640738

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Illustration 8	g02640858
Cutaway view of the ball clamp assembly which is located near the combustion head group.

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Illustration 9	g02640860
Cutaway view of the ball clamp assembly.

4. Position tube assembly (3) and tighten clamp assembly (2) . Tighten clamp assembly (2) to a torque of 12 ± 4 N·m (106 ± 35 lb in).

5. Prior to installation, position both ball clamp assemblies (4) and (8) onto the bellows assembly.

6. Position the bellows assembly between the Clean Emissions Module and the tube assembly (2) . Adjust the length of elbow (7) in the slip joint at clamp assembly (6) in order to position the bellows assembly.

7. Verify that the cup of the Ball Joint (E) does not touch the radius of the Ball (D) . Position ball clamp (8) and hand tighten ball clamp (8) . Measure Dimension (Y) and Dimension (Z) . Dimension (Y) and Dimension (Z) should be equal to each other. Repeat the measurements every 90° around ball clamp (8) . If necessary, adjust ball clamp (8) .

8. Repeat Step 7 for ball clamp (4) which is located near the turbocharger.

9. Verify that Mark (B) is not visible at the slip joint that is positioned near clamp assembly (6) .

Note: Do not use power tools in order to torque clamp assemblies (4) , (6) , and (8) .

10. Torque ball clamp (8) to a torque of 35 ± 2 N·m (26 ± 1 lb ft).

11. Torque ball clamp (4) to a torque of 35 ± 2 N·m (26 ± 1 lb ft).

12. Remove alignment wrap (A) from bellows (5) .

13. Torque clamp assembly (6) to a torque of 55 ± 8 N·m (41 ± 6 lb ft).

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Illustration 10	g02640736

14. Install panel assembly (1) .