Marathon — Lubrication Procedure
Maintenance · Bearings
From a Marathon service manual — check it applies to your exact model before use.
Before you start
- Overgreasing bearings can cause premature bearing and/or generator failure; quantity must be carefully controlled.
Procedure
- Read caution statements; stop generator and lock out of service.
- Remove contaminants from fill and drain plugs and surrounding area.
- Remove fill and drain plugs; check fill and drain holes for blockage.
- Insert 1/8 in. N.P.T. grease fitting in fill pipe.
- Add proper type and amount of grease per nameplate or Table 5-3.
- Start unit with drain plug removed; run 15 minutes to drain excess grease.
- Wipe off excess grease and replace fill and drain plugs; generator ready for operation.
Tools required
- 1/8 in. N.P.T. grease fitting Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Mobil® Polyrex® EM grease
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.