Need help?Do you have a question about the Generac Power Systems GTV-990 and is the answer not in the manual?
General| Cylinder Block | Cast Iron |
|---|---|
| Cooling System | Air-cooled |
| Fuel Type | Gasoline |
| Compression Ratio | 8.5:1 |
| Starting System | Electric start |
| Engine Type | 4-Cycle, OHV |
Defines DANGER, WARNING, CAUTION, and NOTE terms used in the manual.
Explains the meaning of various hazard and safety symbols.
Outlines critical safety checks and procedures before starting the engine.
Details safety precautions and guidelines for operating the engine safely.
Provides guidance on contacting authorized service dealers for repairs.
Explains the process of drawing fuel-air mixture into the cylinder.
Describes the compression of the fuel-air mixture within the cylinder.
Details the combustion event and the downward force on the piston.
Explains the process of expelling burnt gases from the cylinder.
Outlines recommended maintenance intervals for various engine components.
Specifies recommended types and grades of fuel and oil for the engine.
Details requirements and advice for using gasoline as fuel.
Explains the importance and function of engine lubrication.
Lists the specific API service classifications and weights for engine oil.
Provides instructions for draining and refilling the engine oil.
Details the procedure for replacing the engine oil filter.
Describes how to clean the air intake screen to ensure proper cooling.
Outlines the procedure and specifications for replacing spark plugs.
Covers general care and maintenance of the air cleaner system.
Specific instructions for servicing dual-element air cleaners.
Specific instructions for servicing canister-style air cleaners.
Lists common engine operational complaints and initial diagnostic steps.
A step-by-step method for diagnosing engine starting or running problems.
Procedures for verifying the engine's ignition system is functioning correctly.
Method to check for ignition misses while the engine is operating.
Diagnosing ignition issues related to spark plugs or other faults.
A test to compare the performance output of each cylinder.
Instructions for checking the engine's fuel system and pressure.
Procedure for measuring cylinder compression to assess engine health.
Method to test the sealing capability of cylinder components.
Lists factors that can impact the performance of both engine cylinders.
Lists factors that can impact the performance of a single engine cylinder.
Discusses how powered equipment issues can mimic engine problems.
Common causes and checks for engines that are difficult to start or won't start.
Troubleshooting steps for engines that fail to shut off.
Identifies causes and solutions for engine vibration issues.
Diagnosing and addressing causes of reduced engine power.
Troubleshooting common sources of engine noise.
Overview of the engine's magneto ignition system.
Details on testing, removing, and installing ignition armatures.
Procedures for removing and inspecting the engine flywheel.
Information on the engine's wiring harness and its components.
Steps to set the correct air gap between the armature and flywheel magnet.
Instructions for safely removing the engine flywheel.
Procedures for correctly installing the engine flywheel.
Using a multimeter to test the continuity and function of ground wires.
Explains how to diagnose ignition system issues related to diodes.
Identifies the different types of carburetors used on the engine models.
Step-by-step guide for removing the carburetor assembly.
Instructions for cleaning the engine's carburetor.
Step-by-step guide for reinstalling the carburetor assembly.
Procedure for setting the governor's static position for proper operation.
Information about the engine's pulse fuel pump and its function.
Details the disassembly and reassembly of the mechanical governor system.
Explains the function and checks for wear on governor components.
Information on inspecting and replacing the governor arm and related parts.
Procedure for setting the governor's static position for correct engine speed.
Steps for adjusting the governor under dynamic operating conditions.
Instructions for reassembling the crankcase cover and related governor parts.
Reiteration of static governor adjustment procedure from page 25.
Reiteration of dynamic governor adjustment procedure from page 25.
General notes on cylinder head and valve procedures.
Steps for disconnecting and removing the cylinder heads.
Instructions for removing rocker arm assemblies from the cylinder head.
Procedure for taking apart the cylinder head components.
Guidelines for inspecting cylinder heads for damage and wear.
Methods for reconditioning valve seats and faces.
Steps for reassembling the cylinder head components.
Procedure for installing the cylinder head onto the engine block.
Instructions for setting the correct valve lash for engine performance.
Final steps for reassembling external engine components after head installation.
Procedure to adjust the governor after cylinder head work.
Overview of the engine's electric starter system and its operation.
Common starting problems and diagnostic approaches for the starter system.
Lists recommended tools for testing starter motor components.
Procedures for testing the starter motor and its related parts.
Details on battery requirements, care, and testing for the starter system.
Method for testing the electrical activation of the starter solenoid.
Guidelines for installing the starter battery and related connections.
Steps for inspecting battery condition, charge, and specific gravity.
Using a multimeter to test battery voltage under cranking load.
Specifies the recommended cold cranking amperage for the battery.
Guidance on selecting appropriate battery cable sizes.
Explains the function and connections of an optional wiring harness.
Overview of the 20 amp AC/DC charging system.
Procedure to test the AC output voltage of the alternator.
Method to test the integrity of the DC charging circuit wiring.
Procedure to verify the charging system's performance by checking battery voltage.
Refers to battery selection information in Section 6.
Explains the full-pressure lubrication system and oil distribution.
Details on low oil pressure and high-temperature shutdown switches.
Instructions for accurately checking and maintaining the engine oil level.
Comprehensive guide to performing routine oil and filter changes.
Specifies the correct oil viscosity and API classification for the engine.
Step-by-step instructions for changing engine oil and filter.
Information on the function and maintenance of the engine oil cooler.
General steps and parts removal for disassembling the engine.
Procedures for inspecting the crankcase for damage and bore wear.
Notes that oversizing cylinder bores is not an option.
Discusses the importance of cross-hatch for piston ring break-in.
Emphasizes thorough cleaning of the cylinder and crankcase after honing.
Instructions for checking, removing, and installing crankshaft bearings.
Method for inspecting the magneto end crankshaft bearing for wear.
Procedure for pressing out the magneto end crankshaft bearing.
Method for inspecting the PTO end crankshaft bearing for wear.
Procedure for pressing in the magneto end crankshaft bearing.
Refers to mag bearing procedure for PTO end bearing service.
Instructions for installing the PTO end crankshaft oil seal.
Method for inspecting camshaft bearings for wear.
General advice on installing and lubricating new oil seals.
Procedures for inspecting crankshaft threads, keyways, and journals for wear.
Procedures for inspecting camshaft gear teeth, lobes, and journals for wear.
General notes on installing new piston rings and checking cylinder bores.
Steps for separating the piston from the connecting rod.
Procedures for checking piston ring groove clearance and ring end gap.
Instructions for checking the piston pin and connecting rod bearings.
Steps for assembling pistons to connecting rods with correct orientation.
Method for installing piston rings onto the piston using a ring expander.
Procedure for installing the lubricated crankshaft into the engine block.
Steps for installing piston and connecting rod assemblies into cylinders.
Instructions for installing the engine oil pump assembly.
Procedure for installing the engine camshaft with timing marks aligned.
Steps for installing the crankcase cover with a new gasket.
Procedures for mounting the alternator and ignition coils to the engine.
Instructions for installing the engine breather assembly.
Steps for installing the engine flywheel onto the crankshaft.
Procedure to set the correct air gap for ignition coils.
Steps for installing the cylinder heads with new gaskets.
Instructions for installing rocker arms and related components onto cylinder heads.
Procedure for setting the correct valve lash for engine operation.
Final steps for assembling external engine components like shields and housings.
Refers to the detailed static governor adjustment procedure in Section 4.
Lists standard and reject dimensional specifications for engine components.
Provides common operational specifications like air gaps and valve clearances.
A compilation of torque values for various engine fasteners and components.
To Next Page