Marathon — Pre-Start Inspection
Operation · Generator
From a Marathon service manual — check it applies to your exact model before use.
Before you start
- Do not apply any force to generator fan when rotating rotor.
- Residual voltage is present at generator leads and regulator panel connections even with regulator fuse removed.
Procedure
- Visual inspection for loose parts, connections, or foreign materials.
- Check clearance in generator and exciter air gap; bar rotor 2 revolutions.
- Check all wiring against connection diagrams; insulate all connections.
- Be sure equipment is properly grounded.
- Inspect for remaining packing materials; remove loose debris.
- Check fasteners for tightness.
- Check no tools or hardware left inside or near machine.
- Install and check all covers and guards are in place and secure.
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.