Cummins/Onan — Change the LF-777 Lubricating Oil Spin-On By-pass Filter

Maintenance · By-pass oil filter

From a Cummins/Onan owner's manual covering: KT38, KTA19, Kt19, KtA38, KtA50, N-855, NH-672, NH-743, NH-855, NT-855, NTA-855, NTC-270…. Check it applies to your exact model before use.

Applies to: Cummins/Onan Kt19, Cummins/Onan KTA38, Cummins/Onan KTA50

Procedure

1. Unscrew the spin-on filter from the filter head and discard the filter.
2. Apply a light even coat of lubricating oil to the gasket sealing surface prior to installing the filter.
3. Position the filter to the filter head; tighten by hand until the seal touches the filter head, then tighten an additional one turn.
4. Run the engine, check for leaks, shut down the engine and add oil as necessary to the 'H' mark.

Full service-parts list: Cummins/Onan Kt19 →, Cummins/Onan KTA38 →, Cummins/Onan KTA50 →

Source: Cummins/Onan owner'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.

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