Generac QT 6.8L 70kW — Preparation for Start-up (Start-up Checklist)
Installation · Generator set
For the Generac QT 6.8L 70kW, from the Generac owner's manual.
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Before you start
- Before working on the generator, ensure the AUTO/OFF/MANUAL switch is in the OFF position and the 120VAC supply to the battery charger is switched OFF.
Procedure
- Ensure the AUTO/OFF/MANUAL switch is in the OFF position and the 120VAC supply to the battery charger is switched OFF.
- Remove the fuse from the control panel (15 Amp ATO fuse).
- Connect the battery cables to the battery. Attach negative battery cable last.
- Close the 120VAC circuit breaker to the battery charger.
- Measure the voltage at the battery before and after the charger is turned on.
- Verify all AC electrical connections are tight at the circuit breaker and transfer switch.
- Check all hoses, clamps and fittings for leaks or damage.
- Open the valve to the engine fuel line. Bleed the fuel system of air.
- Open the generator main line circuit breaker.
- Connect a manometer to the gas line and record the static pressure.
- Insert the fuse into the control panel.
- Move the AUTO/OFF/MANUAL switch to the MANUAL position; the engine should crank and start.
- Check voltage at the generator terminals and phase rotation for 3-phase units.
- Check for coolant, fuel, oil, and exhaust leaks, then close the generator main line circuit breaker.
- Turn the generator set off. Connect the UTILITY supply to the transfer switch and set the switch to AUTO.
Tools required
- Manometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Static gas pressure must be as listed in the Specifications (11 in. - 14 in. Water Column)
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.