336D 2L and 340D 2L Excavators Machine Systems Caterpillar

Removal Procedure

Start By:

1. Remove the undercarriage frame.

1. Remove all the grease from the swing gear and bearing. Put the grease in a suitable container for storage or disposal.
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   Illustration 1	g00520664

2. Put an alignment mark on swing gear and bearing (1) and on the undercarriage frame assembly for assembly purposes. Attach Tooling (A) and a suitable lifting device to swing gear and bearing (1), as shown. Apply slight lifting tension to the swing gear and bearing.
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   Illustration 2	g00520670

3. Use Tooling (B) to remove bolts (2) and the spacers that hold swing gear and bearing (1) to the undercarriage frame.

4. Remove swing gear and bearing (1). The weight of the swing gear and bearing (1) is approximately 693 kg (1258 lb).
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   Illustration 3	g00721855

   Note: Inner dust seal (3) and outer dust seal (4) may have been installed dry in the swing gear and bearing or inner dust seal (3) and outer dust seal (4) may have been bonded to the swing gear and bearing.

5. Remove inner dust seal (3) and outer dust seal (4) from the swing gear and bearing.

6. Clean the seal grooves of the inner dust seal and the outer dust seal with a fine grit sandpaper. Use a cleaning solvent to clean the sealing grooves. Make sure that the seal grooves are thoroughly clean and dry prior to installing the new dust seals.

Installation Procedure

Note: If the inner dust seal (3) and the outer dust seal (4) are installed dry, the new dust seals should be installed dry in the swing gear and bearing.

Note: If the inner dust seal and the outer dust seal were bonded to the swing gear and bearing, the new dust seals should be bonded to the swing gear and bearing.

Note: Perform Steps 1.a through 1.j to install the new dry dust seals.

Note: Perform Steps 2.a through 2.p to install the new dust seals that are bonded to the swing gear and bearing.

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Illustration 4	g00636223

1. If inner dust seal (3) and outer dust seal (4) were installed dry, use the following procedure to install the new dust seals:

   1. Use a wire brush to thoroughly clean the grooves for the dust seal of the swing gear and bearing. Make sure that all 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. Make sure that the grooves for the dust seal in the swing gear and bearing are thoroughly clean and dry prior to installation of the dust seals.

   4. Cut one end of inner dust seal (3) at a 90 degree angle. Use a blunt tool 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. Refer to Illustration 4.

   6. After the inner dust seal is installed in 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 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 to install outer dust seal (4) in the swing gear and bearing. Refer to Illustration 4 for proper seal orientation in the swing gear and bearing.

2. If inner dust seal (3) and outer dust seal (4) were bonded in the swing gear and bearing, use the following procedure to install the new dust seals:

   1. Thoroughly clean all the dirt and foreign material from the grooves for the dust seal in the swing gear and bearing with a wire brush.

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

   3. Make sure that the grooves for the dust seals in the swing gear and bearing are thoroughly clean and dry prior to installation of the dust seals.

      Note: Install inner dust seal (3) and outer dust seal (4) in the swing gear and bearing in small increments, because Tooling (C) cures quickly.

   4. Cut one end of inner dust seal (3) at a 90 degree angle.

   5. Start applying Tooling (C) 50.8 mm (2.00 inch) from the cut end of the seal. Apply Tooling (C) to the seal in 152.4 mm (6.00 inch) increments.

   6. Immediately use a blunt tool to install only the bonded portion of the inner dust seal in the seal groove of the swing gear and bearing. Make sure that the dust seal is seated properly in the seal groove.

   7. Install the seal so that the lip of the seal is facing in the direction that is shown. Refer to Illustration 4.

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

   9. Apply Tooling (C) to the next 152.4 mm (6.00 inch) of the seal. Immediately use a blunt tool to install only the bonded portion of the inner dust seal in the seal groove of the swing gear and bearing.

   10. Make sure that the inner dust seal is seated properly in the seal groove. Ensure that the inner dust seal has not adhered to the bearing.

       Note: Do not install the last 152.4 mm (6.00 inch) of the inner dust seal.

   11. Repeat Steps 2.i through 2.j until the dust seal is installed.

   12. Measure the inner dust seal and cut the remaining end of inner dust seal (3) at a 90 degree angle. Install the last 152.4 mm (6.00 inch) of seal in the seal groove dry.

   13. Make sure that the inner dust seal is properly seated in the seal groove and that there is no gap between the seal ends. Carefully remove both loose ends of the inner dust seal out of the seal groove.

   14. Apply Tooling (C) to the loose ends of the seal.

   15. Immediately use a blunt tool to reinstall the seal ends in the seal groove. Again, make sure that the inner dust seal is properly seated in the seal groove, and that no gap existed between the ends of the seal.

   16. To ensure that the inner dust seal has not adhered to the top of the bearing, run a dull putty knife around the seal.

   17. Follow the procedure in Steps 2.a through 2.p to install outer dust seal (4) in the swing gear and bearing. Refer to Illustration 4 for proper seal orientation in the swing gear and bearing.

3. Lubricate the swing gear and bearing with grease.
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   Illustration 5	g00520664

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   Illustration 6	g00520674

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

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

5. Fasten Tooling (A) and a suitable lifting device to swing gear and bearing (1), as shown. Refer to Illustration 5. The weight of swing gear and bearing (1) is approximately 693 kg (1258 lb).

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

7. 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. Refer to Illustration 6.
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   Illustration 7	g00520670

8. Apply a thin coat of Tooling (F) on the threads of bolts (2). Install the spacers and bolts (2) that secure the swing gear and bearing to the undercarriage frame assembly.

   Note: Some machines use bolts that are plated with Dacromet. Dacromet bolts appear silver, gray. Do not apply Tooling (F) to the threads of Dacromet bolts. Make sure that the bolt holes are clean and dry when Dacromet bolts are used.

   Note: Torque for bolts (2) is 1000 ± 125 N·m (738 ± 92 lb ft) on 345 excavators.

   Note: Torque for bolts (2) is 250 ± 25 N·m (184 ± 18 lb ft) and turn an additional angle of 55 ± 5 degrees on 336 excavators.

9. Use Tooling (B) to tighten bolts (2) to a torque of 900 ± 100 N·m (665 ± 75 lb ft).

10. Refer to Service Magazine , M0083843 , "An Improved Bolt Tightening Procedure for the Critical Joints Is Now Used on all Excavators" for more detailed information.
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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.

11. Add Tooling (D) to the swing gear and bearing after the installation.

    Reference: Refer to Operation and Maintenance Manual, "Refill Capacities" for the capacity of the swing gear and bearing.

    Reference: Refer to Operation and Maintenance Manual, "Swing Gear - Lubricate" for lubricating the swing gear and bearing.

    Reference: Refer to Operation and Maintenance Manual, "Maintenance Interval Schedule" for the schedule for lubricating the swing gear and bearing.

End By:

1. Install the undercarriage frame assembly.