Generac Power Systems 6.8L Table of Contents

Standby Generator Sets

SECTION PAGE

SAFETY RULES ................................................ 1-1

INTRODUCTION .....................................................1-3

Read this Manual Thoroughly ...................................1-3

Operation and Maintenance ......................................1-3

How to Obtain Service ..............................................1-3

IDENTIFICATION RECORD .....................................2-1

Data Label ................................................................2-1

EQUIPMENT DESCRIPTION ...................................3-1

Equipment Description ................................................3-1

Engine Oil Recommendations ......................................3-1

Coolant Recommendations...........................................3-1

ENGINE PROTECTIVE DEVICES ............................4-1

Coolant Temperature Sensing ...................................4-1

Low Coolant Level .....................................................4-1

Oil Pressure Sensing .................................................4-1

Overcrank Shutdown ................................................4-1

Overspeed Shutdown ................................................4-1

RPM Sensor Loss Shutdown .....................................4-1

DC Fuse ....................................................................4-1

FUEL SYSTEMS .....................................................5-1

Fuel Requirements ....................................................5-1

Natural Gas Fuel System ..........................................5-1

Propane Vapor Withdrawal Fuel System....................5-1

LP Fuel System .........................................................5-1

SPECIFICATIONS ...................................................6-1

Generator .................................................................6-1

Engine.......................................................................6-1

Cooling System .........................................................6-1

Fuel System ..............................................................6-1

Electrical System ......................................................6-1

Cold Weather Kit .......................................................6-2

5.4L & 6.8L Ignition Description .................................6-3

Ignition Power-up Input (“56 Line Input”) .................6-3

Ignition Enable (“14 Line Input”) ..............................6-3

Ignition Shutdown on Loss of Crank

or CAM Signals .........................................................6-3

Diagnostic Blink Patterns (Red LED Located

on the Ignition Control Board ...................................6-3

GENERAL INFORMATION .......................................7-1

Generator AC Lead Connections ..................................7-1

Four-lead, Single-phase Stator ..................................7-1

Alternator Power Winding Connections ........................7-1

3-phase Alternators ..................................................7-1

INSTALLATION .......................................................8-1

Installation ...................................................................8-1

Preparation Before Start-up .........................................8-1

Transfer Switch ........................................................8-1

Fuel System ..............................................................8-1

Generator Set Lubrication ........................................8-1

Prior to Initial Start-up .............................................8-1

Initial Inspection for QT Genset Start-up .....................8-2

Start-up Inspection ...................................................8-2

OPERATION ...........................................................9-1

Generator Control and Operation ................................9-1

Operating Unit with Automatic Transfer Switch ...........9-1

Operating Unit with Manual Transfer Switch ...............9-1

Engine Start-up and Transfer ...................................9-1

Retransfer and Shutdown .........................................9-1

MAINTENANCE .....................................................10-1

Maintenance Performed by Authorized

Service Facilities .....................................................10-1

Cooling System ..........................................................10-1

Checking Fluid Levels ................................................10-1

Check Engine Oil ....................................................10-1

Battery Fluid ...........................................................10-1

Engine Coolant .......................................................10-2

Maintenance Owner/Operator Can Perform ................10-2

Check Engine Oil Level ...........................................10-2

Check Battery .........................................................10-2

Exercise System ......................................................10-2

Inspect Cooling System ...........................................10-2

Check Engine Coolant Level....................................10-2

Perform Visual Inspection .......................................10-2

Inspect Exhaust System ..........................................10-2

Check Fan Belt ........................................................10-2

Inspect Engine Governor ........................................10-2

Changing Engine Oil ...............................................10-2

Changing the Engine Air Cleaner ............................10-3

Spark Plugs ............................................................10-3

Coolant Change .......................................................10-3

Miscellaneous Maintenance ........................................10-3

Cleaning the Generator ...........................................10-3

Battery ....................................................................10-4

Battery Maintenance ...............................................10-4

Battery Replacement ...............................................10-4

SERVICE SCHEDULE ...........................................11-1

30 kW - 150 kW Standby Gas Engine

Driven Generator Sets ............................................11-1

TROUBLESHOOTING ...........................................12-1

Troubleshooting Guide ...............................................12-1

NOTES

EXPLODED VIEWS & PARTS LISTS

WIRING DIAGRAMS & SCHEMATICS

WARRANTY

Content003 Rev. 0 08/05