315B Excavator Machine Systems Caterpillar

Assembly Procedure

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

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Illustration 1	g00483031

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	g00483283

4. Temporarily install a bearing (2) on shaft (5). Install the shaft in the front idler. Install the other bearing (2) on the shaft. Use Tooling (B) to check the end play of the shaft. The shaft end play must be 0.25 mm (.010 inch) to 1.15 mm (.045 inch). Remove two bearings (2) and shaft (5) from the front idler.

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Illustration 3	g00483123

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Illustration 4	g00369712

Note: Refer to Disassembly and Assembly, "Duo-Cone Conventional Seals - Install" in this manual.

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.

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

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

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Illustration 5	g00483029

7. Check the condition of O-ring seals (4) that are used on shaft (5). If the O-ring seals are worn or damaged, use new parts for replacement.

8. Install two O-ring seals (4) on shaft (5). Put clean SAE 30 oil on the O-ring seals.

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Illustration 6	g00483026

9. Check the condition of spring pins (1) that are used to hold bearings (2) to shaft (5). If the spring pins are worn or damaged, use new parts for replacement.

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Illustration 7	g00369733

10. Install shaft (5) in either bearing (2). Be sure that the spring pin hole in the shaft is aligned with the spring pin hole in the bearing. Make sure that the marking "R" and the milled surface of the shaft is toward the rear of the bearing.

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

11. Install spring pin (1). Illustration 7 shows the positioning of the slit in spring pin (1) .

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

13. Repeat Step 10 in order to install the bearing on the opposite side of shaft (5) .

14. Be sure that the spring pin hole in the shaft is aligned with the spring pin hole in the bearing.

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

15. Install spring pin (1) .

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 for 30 seconds. If the pressure remains constant for 30 seconds, assume that there are no leaks in the front idler.

17. Put the front idler in a vertical position. Fill the front idler with 180 mL (6.12 oz) of clean SAE 30 oil.

18. Put 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 and the hydraulic track adjuster as a unit. Refer to Disassembly and Assembly, "Front Idler, Recoil Spring and Hydraulic Track Adjuster - Remove and Install" in this manual.