Marathon — Drying Out
Maintenance · generator windings
From a Marathon service manual — check it applies to your exact model before use.
Procedure
- If possible place machine in oven and bake at temperature not to exceed 90 degrees C (194 degrees F).
- Or enclose generator with a covering, insert heating units and leave a hole at top to let moisture escape.
- Or pass low-voltage current through field or stator windings, not exceeding 85 degrees C (185 degrees F), with machine at rest.
- Take insulation resistance tests every three or four hours until a fairly constant value is obtained.
- Drying out may take as long as 72 hours.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- oven max 90 degrees C / 194 degrees F
- current heating max 85 degrees C / 185 degrees F
- forced-air heat at bearing hub max 150 degrees F
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.