Husqvarna HUV 4421-D / DXP Emission Control System Information Source of Emissions, Maintenance

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Emission Control System Information

Source of Emissions

The combustion process produces carbon monoxide, oxides of nitrogen, and hydrocarbons. Control of hydro- carbons and oxides of nitrogen is very important because, under certain conditions, they react to form photo- chemical smog when subjected to sunlight. Carbon monoxide does not react in the same way, but it is toxic.

Honda utilizes lean carburetor settings and other systems to reduce the emissions of carbon monoxide, oxides of nitrogen and hydrocarbons.

The U.S. and California Clean Air Acts

EPA and California regulations required all manufacturers to furnish written instructions describing the oper- ation and maintenance of emission control systems.

The following instructions and procedures must be followed in order to keep the emissions from your Honda engine within the emissions standards.

Tampering and Altering

Tampering with or altering the emission control system may increase emissions beyond the legal limit. Among those acts that constitute tampering are:

•Removal or alteration of any part of the intake, fuel or exhaust systems.

•Altering or defeating the governor linkage or speed-adjusting mechanism to cause the engine to oper- ate outside its design parameters.

Problems That May Affect Emissions

If you are aware of any of the following symptoms, have your engine inspected and repaired by your servicing dealer.

•Hard starting or stalling after starting.

•Rough idle.

•Misfiring or backfiring under load.

•After burning (backfiring).

•Black exhaust smoke or high fuel consumption.

Replacement Parts

The emission control systems on your Honda engine were designed, built, and certified to conform with EPA and California emission regulations. We recommend replacement parts be purchased from Husqvarna, Inc.. These original-design replacement parts are manufactured to the same standards as the original parts, so you can be confident of their performance. The use of replacement parts that are not of the original design and quality may impair the effectiveness or your emission control system.

A manufacturer of an aftermarket part assumes the responsibility that the part will not adversely affect emis- sion performance. The manufacturer or rebuilder of the part must certify that use of the part will not result in a failure of the engine to comply with emission regulations.

Maintenance

Follow the Periodic Service Schedule in the owner’s manual. Remember that this schedule is based on the assumption that your vehicle will be used for its designed purpose. Sustained high-load or high-temperature operation, or use in unusually wet or dusty conditions, will require more frequent service.

2007 HUV 4421 Gasoline and Diesel Vehicle Owner’s Manual

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Contents 2007 Utility Vehicles Page USA Foreword Table of Contents ALL HUV 4421 Models DRIVER/PASSENGER Warning Decal Rotating Parts Decal Diesel Vehicle Feature Identification Caut ION Safety DetailsDAN G E R Caut ION DAN G E R General WarningsAll-wheel Drive Warning See General Warnings on Controls and IndicatorsGeneral Information Model IdentificationControls and Indicators Accelerator Pedal KEY Switch Gasoline VehiclesKEY Switch Diesel Vehicles FORWARD/REVERSE ControlPark Brake Steering Adjustment LockVolt Accessory Outlet Brake PedalHeadlight Control HIGH-TEMPERATURE Warning Light Diesel Vehicles onlyLOW OIL Warning Light Fuel GAUGE/HOUR MeterRelease Safety Belt ROLL-OVER Protective Structure and Safety BeltsING Seat Latch and AdjustmentExhaust system Check for leaks PRE-OPERATION and Daily Safety ChecklistDriving Instructions Performance InspectionStarting the Vehicle ALL-WHEEL Drive AWD Operation Parking and Leaving the Vehicle BED Latch and Prop RODStopping the Vehicle Bed Latch Loading and Unloading CargoVehicle Load Capacities Transporting on a Trailer Towing with the VehicleSee General Warnings on DAN G E R StorageOFF Preparing the Vehicle for Extended StorageGasoline vehicles Returning the Stored Vehicle to ServiceMaintenance MaintenancePeriodic Service Schedule Periodic Service ScheduleMonthly service by owner Annual service by Periodic Lubrication Schedule Periodic Lubrication ScheduleLubrication Points Gasoline Vehicles OIL Pressure Gasoline Engine Brake Fluid ReservoirEngine OIL Brake FluidDo not remove dipstick while engine is running Engine OIL Level CheckEngine Oil Draining Engine OIL and Filter ChangeDrain the engine oil. See Engine Oil Draining on Engine Oil Filter ChangeRemove Engine Oil Filter OIL Viscosity Engine Oil FillingFront differential Gearcase LubricationRear differential TransmissionEngine Coolant Level Check AIR Filter ReplacementEngine Coolant Diesel Vehicles AIR Intake SystemAir Filter Removal Air Filter InstallationFueling Instructions Fuel Tank Gasoline Vehicles Biodiesel Fuel Diesel Vehicles OnlyDiesel Vehicles Only Draining Water from Fuel FilterFuel Filter BatteryBattery Jump Starting Using a Booster Battery Jump StartingSee following Note Cleaning the VehicleAccessories Electric Winch AccessoryMUD Tire Option Subsequent Owner RegistrationSpecifications Vehicle SpecificationsDIMENSIONS/WEIGHT Tire Pressure Warranty Information Oxygenated Fuels Technical & Consumer Information Gasoline EnginesCarburetor Modification for High Altitude Operation Maintenance U.S. and California Clean Air ActsProblems That May Affect Emissions Replacement PartsYour Warranty Rights and Obligations California Emission Control Warranty StatementPage Page Page Husqvarna Part Number 531 30 Edition Code 0706C0307B
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