Cummins/Onan 5.6TGHAA11381C — Servicing Brushes and Slip Rings
Maintenance · Generator brush block
For the Cummins/Onan 5.6TGHAA11381C, from the Cummins/Onan service manual.
Applies to: Cummins/Onan TGHAA
Before you start
- High voltage; do not touch the spark plug or wire during ignition tests.
Procedure
- Remove the air cleaner and the brush block cover and inspect brushes and slip rings (turn the rotor with a 3/8 inch allen wrench).
- Check brush wear with a marked wire; replace brushes and springs if the wire inserts more than 1 inch (25 mm).
- If slip rings are grooved or pitted, clean with a commutator stone.
- To replace brushes, disconnect leads F1 and F2 from the brush block terminals.
- Remove the brush block mounting screws and lift out the assembly.
- Replace the brushes and brush springs with new parts; connect each brush pigtail to its terminal.
- Remount the brush block, center the brushes on the slip rings and tighten the screws.
- Reconnect F1 to the outboard brush terminal and F2 to the inboard brush terminal.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Replace brushes if wire inserts more than 1 inch (25 mm)
Full service-parts list: Cummins/Onan TGHAA →
Source: Cummins/Onan 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.