Generac MFH500 — Draining Fluids — Central Fluid Drain System
Maintenance
For the Generac MFH500, from the Generac owner's manual.
Applies to: Generac MFH500, Isuzu 4JJ1TT4 engine
Before you start
- Risk of burns. Allow engine to cool before draining oil or coolant.
- Drain one fluid at a time.
Procedure
- Verify unit is off and interior components are cool.
- Verify all ball valves are closed.
- Place a suitable container under the exterior drain port.
- Remove the plug from the exterior drain port.
- Open the ball valve for the fluid being changed.
- Allow fluid to drain.
- Close the ball valve and install the exterior drain plug.
- On the controller, reset the service interval.
Tools required
- Suitable container Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Generac MFH500 →, Isuzu 4JJ1TT4 engine →
Source: Generac 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.