Generac QT 3.9L 40kW — Battery Maintenance
Maintenance
For the Generac QT 3.9L 40kW, from the Generac owner's manual.
Applies to: Generac QT 3.9L 40kW, Generac QT Series, Generac V-type engine
Before you start
- Do not use tap water in batteries.
- Storage batteries give off explosive hydrogen gas.
- Do not use jumper cables or a booster battery to crank the engine.
Parts for this job
Part numbers from the service-parts lists for Generac QT 3.9L 40kW, Generac QT Series. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Inspect battery posts and cables for tightness and corrosion; tighten and clean as necessary.
- Check battery fluid level of unsealed batteries; fill with DISTILLED WATER only if necessary.
- Have state of charge and condition checked with an automotive-type battery hydrometer.
Tools required
- Automotive-type battery hydrometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- BCI Group No. 24F-6, CCA 535 @ 0 deg. F
Full service-parts list: Generac QT 3.9L 40kW →, Generac QT Series →
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.