336E Excavator and 336E MHPU Mobile Hydraulic Power Unit Machine Systems Swing Gear and Bearing - Install Caterpillar

Installation Procedure

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Illustration 1	g02128394

1. Use the following procedure in order to install the new inner dust seal (3) and the new outer dust seal (4):

   1. Use a wire brush in order to clean the grooves for the dust seal of the swing gear and bearing. Make sure that all of the dirt and foreign material has been removed.

   2. Wash the grooves for the dust seal in a suitable solvent that will not leave an oily residue.

   3. The grooves for the dust seal in the swing gear and bearing must be clean and dry prior to installation of the dust seal.

   4. Cut one end of inner dust seal (3) at a 90 degree angle. Use a blunt tool in order to install the inner dust seal in the seal groove of the swing gear and bearing.

   5. Install the seal so that the lip of the seal is facing in the direction that is shown.

   6. After the inner dust seal is installed into the seal groove, measure the seal and cut the remaining end of the inner dust seal at a 90 degree angle. Install the remaining end of the inner dust seal in the seal groove.

   7. Make sure that the inner dust seal is seated properly in the seal groove, all the way around the swing gear and bearing. Also, make sure that there is no gap between the ends of the inner dust seal.

   8. Pull each end of the inner dust seal out of the seal groove of the swing gear and bearing approximately 50.8 mm (2.00 inch). Apply Tooling (C) to each end of the inner dust seal in order to bond the seals together.

   9. Immediately reinstall the inner dust seal in the seal groove of the swing gear and bearing. Again, make sure that the entire inner dust seal is properly seated in the seal groove of the swing gear and bearing. No gap should exist between the ends of the inner dust seal.

   10. To ensure that the lip of inner dust seal has not adhered to the top of the bearing at the seal joint, run a dull putty knife between the lip of the seal and the bearing at the seal joint.

   11. Follow the procedure in Steps 1.a through 1.j in order to install outer dust seal (4) in the swing gear and bearing. Refer to Illustration 1 for proper seal orientation in the swing gear and bearing.

2. Lubricate the swing gear and bearing with grease.
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   Illustration 2	g00520664

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   Illustration 3	g00520674

   Note: Clean the mating surface for the swing gear and bearing on the undercarriage frame assembly.

3. Apply Tooling (E) on the mating surface for the swing gear and bearing of the undercarriage frame assembly.

4. Attach Tooling (A) and a suitable lifting device to swing gear and bearing (1), as shown. The weight of swing gear and bearing (1) is 640 kg (1410 lb).

5. Place the swing gear and bearing in its original position on the undercarriage frame assembly.

6. Make sure that the Stamp "S" on the inner race is in the position that is shown, relative to the undercarriage frame assembly and the stopper on the outer race.
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   Illustration 4	g00520670

7. Apply Tooling (F) to the threads of bolts (2). Install the spacers and bolts (2) that secure the swing gear and bearing to the undercarriage frame assembly.

8. Use Tooling (B) to tighten bolts (2) to a torque of 900 ± 100 N·m (665 ± 75 lb ft).
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   NOTICE
   Improper lubrication can cause damage to machine components. To avoid damage, make sure that the proper amount of grease is applied to the swing drive. When the amount of grease in the compartment becomes too large, the agitation loss becomes large, thereby accelerating grease deterioration. Grease deterioration can cause damage to the pinion gear of the swing drive and swing internal gear. Not enough grease will result in poor gear lubrication.

9. Add Tooling (D) to the swing gear and bearing after the installation . Refer to Operation and Maintenance Manual, "Swing Gear - Lubricate" and Operation and Maintenance Manual, "Swing Bearing - Lubricate"for lubricating the swing gear and bearing.

End By:

1. Install the undercarriage frame assembly.