Cummins/Onan NTA855 — Crankcase Breather Service
Maintenance
For the Cummins/Onan NTA855, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan DFBF, Cummins/Onan DFCB, Cummins/Onan DFCC, Cummins/Onan DFCE, Cummins/Onan DQBA, Cummins/Onan DQBB, Cummins/Onan NTA855, Cummins/Onan NT855 engine, Cummins/Onan NTA855 engine, Cummins/Onan N14 engine
Procedure
- Remove wing nut, flat washer and rubber washer holding cover.
- Lift cover and swing away from filter assembly.
- Lift out breather element, vapor element and gasket.
- Clean all parts with approved solvent; dry with compressed air (30 psi maximum).
- Inspect all parts, replace if necessary.
- Reassemble filter assembly, replace cover and secure.
Tools required
- Compressed air Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Compressed air 30 psi maximum (OSHA)
Full service-parts list: Cummins/Onan DFBF →, Cummins/Onan DFCC →, Cummins/Onan DFCE →, Cummins/Onan DQBA →, Cummins/Onan DQBB →
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.