CIPI UNDERCARRIAGE Arrangements: 3Q6662, 6Z7861, 6Z7885, 6Z7947, 6Z7957, 6Z7999, 9Q5044, 9Q5065, 9Q5082, 9Q5090, 9Q5093, 9Q5115, 9Q5118, 9Q5126, 9Q5135, 9Q5141, 9Q5168, 9Q5175, 9Q5206, 9Q5255, 9Q5259, 9Q5268, 9Q5412, 9Q5436, 9Q5464, 9Q5514, 9Q5617, 9 Caterpillar

Assembly Procedure

Note: For information on welding front idlers, refer to Undercarriage Reconditioning Bulletin, SEBF8552-02, "Procedure for Idler Weld Rebuild".

1. Thoroughly clean all of the parts of the front idler prior to assembly.

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Illustration 1	g00494553

2. Check the condition of bushings (7). If the bushings are worn or damaged, use new parts for replacement.

3. Lower the temperature of bushings (7), and install one in each side of the front idler with a press.

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Illustration 2	g00494532

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Illustration 3	g00494539

4. Temporarily install a bearing (2) on shaft (5) .

5. Install the shaft in the front idler.

6. Install the other bearing (2) on the shaft.

7. Use Tooling (B) to check the end play of the shaft. The shaft end play must be 0.26 mm (.010 inch) to 1.26 mm (.050 inch).

8. Remove two bearings (2) and shaft (5) from the front idler.

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Illustration 4	g00494560

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Illustration 5	g00494583

Note: The rubber seals and all of the surfaces that make contact with the seals must be clean and dry. After the installation of the seals, put clean SAE 30 oil on the contact surfaces of the metal seals. For more information concerning the assembly and installation of Duo-Cone Seal kits, refer to Disassembly and Assembly, "Duo-Cone Conventional Seals - Install" in this manual.

9. Install a Duo-Cone seal (6) in each side of the idler with Tooling (A) .

10. Install a Duo-Cone seal (3) in each bearing (2) with Tooling (A) .

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Illustration 6	g00494546

11. Install new O-ring seals (4) on shaft (5) .

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Illustration 7	g00494526

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Illustration 8	g00494586

12. Install shaft (5) in either bearing (2). Make sure that the spring pin hole in the shaft is aligned with the spring pin hole in the bearing. Also, make sure that the marking "R" and the milled surface of the shaft are facing toward the rear of the bearing when the bearing is positioned on the machine.

Note: Do not reuse spring pin (1). Use a new part for replacement.

13. Install a new spring pin (1) in order to hold the unit together. Position the slit in the spring pin, as shown. Refer to Illustration 8.

14. Install the shaft and the bearing in the front idler.

15. Repeat Steps 12 and 13 in order to install the other bearing (2) on shaft (5) .

16. Check the front idler for air leaks. Apply 245 kPa (35.5 psi) to 265 kPa (38.5 psi) of air pressure to the idler. Apply the air pressure for a minimum of 30 seconds. If the pressure gauge reading remains constant for 30 seconds, assume that there are no leaks in the front idler.

17. Place the front idler in a vertical position. Use clean SAE 30 oil and fill the front idler. The capacity of the front idler is 180 ± 20 mL (6.12 ± .68 oz).

18. Apply a thin coat of 9S-3263 Thread Lock Compound on the threads of the fill/drain plug. Install the fill/drain plug.

End By: Install the front idler, the recoil spring assembly, and the hydraulic track adjuster as a unit. Refer to Disassembly and Assembly, "Front Idler, Recoil Spring and Hydraulic Track Adjuster - Install" in this manual.