Marathon — Opposite Drive End Bearing Bracket Removal

Repair & overhaul

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

Procedure

1. Rotate the alternator shaft until two main rotor poles are in a vertical position.
2. Disconnect exciter field leads F+ and F- from the automatic voltage regulator.
3. Ensure the leads are free to move when the bearing bracket is removed.
4. Remove the bearing bracket retaining bolts.
5. Using a pair of screw drivers, wedge the bracket off the frame.
6. After approximately 1/8 inch, the bracket clears the locating register and drops until the rotor rests on the main stator core.
7. Continue to pull the bracket free from the bearing.
8. Visually inspect the bearing bore and o-ring (if equipped) for damage or wear.
9. If worn or damaged, repair or replace prior to reassembly.

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.

More Marathon repair guides →