Marathon — Drive End Bearing Bracket Removal, Two Bearing Units

Repair & overhaul

From a Marathon service manual — check it applies to your exact model before use.

Procedure

1. Remove any drive arrangement from the generator shaft extension.
2. Remove the bearing lock ring retaining screws.
3. Support the shaft extension with a hoist and sling, jack, or other support with a capacity of 2 tons.
4. Remove the bearing bracket retaining cap screws.
5. Using a flat bladed screw driver or chisel, pry the bracket back from the frame.
6. After approximately 1/8 inch, the bracket clears the locating register on the frame.
7. Lower the shaft extension until the rotor is resting on the main stator core.
8. Continue to pull the bracket free from the bearing.
9. Visually inspect the bearing bore for damage or wear.
10. If worn or damaged, sleeve or replace prior to reassembly.
11. Before seating the bearing bracket against the frame, a threaded rod may align the inner bearing cap with the bracket.

Source: Marathon service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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