Generac GT-990 — Major Disassembly - Stator/Rotor/Engine Removal
Repair & overhaul · Generator Assembly
For the Generac GT-990, from the Generac service manual.
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Procedure
- Remove door.
- Set AUTO-OFF-MANUAL switch to OFF; disconnect battery; remove Fuse F1; turn off utility and fuel.
- Remove control panel cover.
- Disconnect stator leads and C1, C2, C3 connectors.
- Disconnect fuel hoses.
- Remove front and back exhaust enclosure covers.
- Remove muffler.
- Remove exhaust side enclosure.
- Remove fan housing cover.
- Remove rotor bolt.
- Remove fan using steering wheel puller.
- Remove alternator divider panel.
- Remove stator.
- Remove rotor.
- Remove engine.
Tools required
- 10mm socket Amazon
- 7mm socket Amazon
- 13mm socket Amazon
- 9/16 inch socket Amazon
- steering wheel puller Amazon
- rubber mallet Amazon
- 1/4 inch socket Amazon
- 3 inch M12x1.75 bolt Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Flywheel nut 50 ft-lbs
- Stator bolts 6 ft-lbs
- Rotor bolt 30 ft-lbs
- Engine adapter 25 ft-lbs
Source: Generac 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.