Table Of Contents - Generac Power Systems GN190H Service And Repair Manual

DIMENSIONS AND FEATURES ............................ 3-7
4-CYCLE ENGINE THEORY ...................................... 8
SECTION 1: GENERAL ...................................... 9-12
PURPOSE AND SCOPE OF MANUAL ................................ 8
SMALL FRAME ENGINES .................................................. 8
LONG BLOCK .................................................................. 8
ENGINE I.D. NUMBER/SERIAL NUMBER ............................ 8
ENGINE CARE ................................................................ 10
Recommended Fuels .................................................. 10
Recommended Engine Oil .......................................... 10
Change Oil Filter ........................................................ 10
STORAGE INSTRUCTIONS .............................................. 10
TUNE-UP PROCEDURE .............................................. 10-11
OVERSIZE PARTS ............................................................ 12
SECTION 2: AIR CLEANERS AND CARBURETION 14-17
AIR CLEANER ................................................................ 14
Servicing .................................................................... 14
Foam Pre-Cleaner ...................................................... 14
Paper Filter ................................................................ 14
Air Cleaner Box Removal ............................................ 14
Air Cleaner Box Installation ........................................ 15
CARBURETION .............................................................. 15
General...................................................................... 15
Common Carburetor Problems .................................. 15
Adjustable and Fixed Main Jet .................................... 15
Carburetor Removal .................................................. 16
Carburetor Disassembly.............................................. 16
Cleaning and Inspection ............................................ 16
Carburetor Installation .............................................. 16
SECTION 3: MECHANICAL GOVERNOR.......... 18-20
GOVERNOR OPERATION ................................................ 18
GOVERNOR INTERNAL PARTS ........................................ 18
GOVERNOR EXTERNAL PARTS .................................. 18-19
Removal of Governor External Parts ...................... 18-19
Installation of Governor External Parts........................ 19
GOVERNOR GEAR SHAFT REPLACEMENT ...................... 19
Inspection .................................................................. 19
Removal .................................................................... 19
Installation ................................................................ 19
LINKAGE INSTALLATION ................................................ 19
GOVERNOR ADJUSTMENT ........................................ 19-20
Initial Adjustment.................................................. 19-20
Running Adjustment .................................................. 20
SECTION 4: OPTIONAL IDLE CONTROL .......... 22-23
GENERAL ...................................................................... 22
OPERATING INSTRUCTIONS............................................ 22
Before Start-up .......................................................... 22
Engine Running.......................................................... 22
CIRCUIT OPERATION ...................................................... 22
IDLE CONTROL ADJUSTMENT ........................................ 23
General...................................................................... 23
Initial Adjustment ...................................................... 23
Final Adjustment ........................................................ 23
SECTION 5: REWIND STARTERS...................... 24-25
GENERAL ...................................................................... 24
REWIND ASSEMBLY REMOVAL ...................................... 24
DISASSEMBLY (OLD STYLE) ............................................ 25
REASSEMBLY.................................................................. 25
DISASSEMBLY (NEW STYLE)............................................ 25
SECTION 6: ELECTRIC STARTERS AND BATTERIES ..26-28
INTRODUCTION ............................................................ 26
STARTER CONTACTOR SYSTEM...................................... 26
HEAVY DUTY SWITCH SYSTEM ...................................... 26
STARTER MOTOR OPERATING PRINCIPLES ...................... 26
THE BENDIX DRIVE ........................................................ 26
STARTER MOTOR REPAIRS ........................................ 26-27
Starter Motor Removal .............................................. 26
Starter Motor Installation ...................................... 26-27
TESTING THE STARTER MOTOR ...................................... 27
Checking the Pinion .................................................. 27
Tools for Starter Performance Test .............................. 27
Starter Performance Test ............................................ 27
BATTERY MAINTENANCE .............................................. 27
General...................................................................... 27
Inspecting the Battery ................................................ 27
Electrolyte Level ........................................................ 27
TESTING A BATTERY ................................................ 27-28
SECTION 7: COVERS AND SHROUDS .................. 29
GENERAL ...................................................................... 29
Installation of Covers and Shrouds ............................ 29
1

TABLE OF CONTENTS