CIPI UNDERCARRIAGE Arrangements: 1667049, 2372904, 3Q6481, 6Z7988, 6Z7989, 9Q5032, 9Q5040, 9Q5043, 9Q5046, 9Q5047, 9Q5066, 9Q5074, 9Q5097, 9Q5098, 9Q5116, 9Q5134, 9Q5136, 9Q5142, 9Q5147, 9Q5148, 9Q5149, 9Q5172 and 9Q5204 Caterpillar

Assembly Procedure for the Front Idler on CIPI Undercarriage Arrangements which are Based on 330 and 330B Track Type Excavators

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). Install the shaft in the front idler. Install the other bearing (2) on the shaft. Check the end play of the shaft. The shaft end play must be 0.26 mm (.010 inch) to 1.26 mm (.050 inch). 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 Conventional Duo-Cone Seals, refer to Disassembly and Assembly, "Duo-Cone Conventional Seals - Install" in this manual.

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

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

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Illustration 6	g00494546

7. Check the condition of O-ring seals (4) that are used on shaft (5). If the O-ring seals are damaged, use new parts for replacement. Install two O-ring seals (4) on shaft (5). Apply clean SAE 30 oil on the seals.

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Illustration 7	g00494526

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Illustration 8	g00494586

8. 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.

9. 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.

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

11. Repeat Steps 8 and 9 in order to install the other bearing (2) on shaft (5) .

12. 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.

13. Place the front idler in a vertical position. Use clean SAE 30 oil and fill the front idler to 555 ± 30 mL (18.8 ± 1.01 oz) .

14. 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 and the recoil spring as a unit. Refer to Disassembly and Assembly, "Front Idler and Recoil Spring - Install" in this manual.