Cummins/Onan — Cooling System Removal
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKA, Cummins/Onan HDKAH, Cummins/Onan HDKAJ, Cummins/Onan HDKAK
Before you start
- Hot coolant spray can cause severe burns.
Procedure
- Remove top and back housing panels.
- Drain cooling system.
- Remove muffler.
- Disconnect upper and lower hoses from engine; loosen hose bracket.
- Remove screw securing system drain T.
- Remove 2 screws in horizontal bulkhead under radiator.
- Pull radiator, recovery tank, and bulkhead away as assembly.
Full service-parts list: Cummins/Onan HDKA →, Cummins/Onan HDKAH →, Cummins/Onan HDKAJ →, Cummins/Onan HDKAK →
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.