Cummins/Onan A052J727 — Draining and Cleaning the Cooling System
Maintenance
For the Cummins/Onan A052J727, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan MDKD
Before you start
- Hot coolant is under pressure and can spray, causing severe burns.
Procedure
- Disconnect the negative battery cable; let the engine cool.
- Remove the pressure cap.
- Remove the heat exchanger drain plug and open the block drain valve.
- Drain coolant into suitable containers for disposal.
- Clean and flush the system with radiator cleaning chemicals before refilling.
Tools required
- Insulated wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan MDKD →
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.