Cummins/Onan — Cleaning the Spark Arrestor (Series HGJAD)
Maintenance · Muffler spark arrestor
From a Cummins/Onan operator's manual covering: 5.5 HGJAD, 5.5 HGJAE, 5.5 HGJAF, 6.5 HGJAE, 6.5 HGJAF, 7.0 HGJAD, 7.0 HGJAE. Check it applies to your exact model before use.
Applies to: Cummins/Onan 5.5 HGJAD, Cummins/Onan 5.5 HGJAE, Cummins/Onan 6.5 HGJAE, Cummins/Onan 7.0 HGJAD, Cummins/Onan 7.0 HGJAE, Cummins/Onan HGJAD, Cummins/Onan HGJAE, Cummins/Onan HGJAF
Before you start
- A hot muffler can cause severe burns; let it cool before removing plugs.
Procedure
- Locate the square-headed cleanout plug by hand.
- Seat 7/16 inch eight point socket with extensions and remove plug.
- Start and load genset to near full power; run about five minutes.
- Stop genset, allow muffler to cool, reinstall the plug.
Tools required
- 7/16 inch eight point socket Amazon
- 3 inch extension Amazon
- swivel section Amazon
- 6 inch extension Amazon
- ratchet Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan 5.5 HGJAD →, Cummins/Onan 5.5 HGJAE →, Cummins/Onan 6.5 HGJAE →, Cummins/Onan 7.0 HGJAD →, Cummins/Onan 7.0 HGJAE →, Cummins/Onan HGJAD →
Source: Cummins/Onan operator's 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.