Marathon — Bearing Replacement

Repair & overhaul

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

Procedure

1. Using a bearing puller, remove the existing bearing.
2. Replace the bearing any time it is removed from the shaft.
3. Always install the same type and size bearing that was supplied as original equipment.
4. Order by part number from the parts list, and include the unit serial number and part number.
5. Heat the bearing to a maximum of 100°C (212°F) in an oven.
6. Apply a thin coat of clean lubricating oil to the press fit area of the rotor shaft.
7. Using suitable heat resistant gloves, install the bearing over the end of the shaft until it seats against the shaft shoulder.
8. The bearing should slide on the shaft and be seated without excessive force.
9. If the bearing binds before seating, use tubing slightly larger than the press fit area to drive it to final position.
10. Using light taps with a soft mallet, apply pressure to the inner race only.

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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