Bolens 643B, 643C, 645A Engine Cleaning AIR Cleaner Service Engine OIL Service, Spark Plug Service

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Replacement Belt Information

If the drive belt needs to be replaced, see your local authorized dealer or refer to the Parts List for ordering information. Use only a factory-authorized belt as an “over-the-counter” belt may not perform satisfactorily. The procedure requires average mechanical ability and commonly available tools.

ENGINE CLEANING

Keeping the engine clean will help to ensure smooth operation and prevent damage from overheating. Refer to the Engine Owner’s Manual for engine cleaning service intervals and instructions. Be sure that the muffler is cool before servicing the engine.

AIR CLEANER SERVICE

The air cleaner filters dirt and dust out of the air before it enters the carburetor. Operating the engine with a dirty, clogged air filter can cause poor performance and damage to the engine. Never operate the engine without the air cleaner installed. Inspect and service the air cleaner more often if operating in very dusty or dirty conditions. Refer to the engine Owner’s Manual for air cleaner service intervals and instructions.

ENGINE OIL SERVICE

Check the engine oil level before each use and after every five hours of continuous operation. Running the engine when it is low on oil will quickly ruin the engine.

It is recommended that you change the motor oil after every 10 hours of operation and even sooner when operating in extremely dirty or dusty conditions. Refer to the Engine Owner’s Manual for detailed service instructions.

A. To Check the Engine Oil Level:

1.Park the tiller on a level area and shut off the engine.

2.Level the engine (use the Depth Regulator Lever to adjust the engine angle).

3.Clean around the oil dipstick or oil fill tube (which- ever applies) to prevent dirt from falling into the crankcase.

4.On engines with an oil fill tube, remove the fill cap and add oil (if required) until it reaches the top of the fill tube. Reinstall the fill cap.

5.On engines with a dipstick, remove it and wipe it clean. Reinsert the dipstick, tighten it securely, and remove it. Add oil as needed to bring the level up to the FULL mark. Wipe dipstick clean each time oil level is checked. Do not overfill. Tighten dipstick securely.

B. To Change the Engine Oil:

Change the engine oil as instructed in the Engine Owner’s Manual.

SPARK PLUG SERVICE

Inspect and clean or replace the spark plug after every 100 operating hours or annually. Refer to the Engine Owner’s Manual for spark plug service instructions.

In some areas, local law requires using resistor spark plugs to suppress ignition signals. If the engine was originally equipped with a resistor spark plug, use the same type for replacement.

SPARK ARRESTER SCREEN SERVICE

If the engine muffler is equipped with a spark arrester screen, remove and clean it according to the service intervals and instructions in the Engine Owner’s Manual.

THROTTLE LEVER ADJUSTMENT

If the engine does not respond to various throttle lever settings, refer to the Engine Owner’s Manual for service information or contact your local authorized engine dealer.

CARBURETOR/GOVERNOR CONTROL ADJUSTMENTS

The carburetor was adjusted at the factory for best operating speed. Refer to the Engine Owner’s Manual for any adjustment information or see your authorized engine dealer.

The governor controls the maximum safe operating speed and protects the engine and all moving parts from damage caused by overspeeding. Do not tamper with the engine governor settings.

OFF-SEASON STORAGE

When the tiller won’t be used for an extended period, prepare it for storage as follows:

1.Clean the tiller and engine.

2.Do routine tiller lubrication and check for loose parts and hardware.

3.Protect the engine and perform recommended engine maintenance by following the storage instructions found in the

Engine Owner’s Manual. Be sure to protect the fuel lines, carburetor and fuel tank from gum deposits by removing fuel or by treating fuel with a fuel stabilizer (follow engine manufacturer’s recommendations).

4.Store unit in a clean, dry area.

5.Never store the tiller with fuel in the fuel tank in an enclosed area where gas fumes could reach an open flame or spark, or where ignition sources are present (space heaters, hot water heaters, furnaces, etc.).

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Maintenance

WARNING

Loading and unload- ing the tiller into a vehicle is potentially hazardous and we don’t recommend doing so unless absolutely necessary, as this could result in personal injury or property damage. However, if you must load or unload the tiller, follow the guidelines given next.

Operators shall not tamper with the engine governor set- tings on the machine; the governor controls the maximum safe operating speed to protect the engine and all moving parts from damage caused by overspeed. Autho- rized service shall be sought if a problem exists.

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Contents 02/24/2006 772C0845Table of Contents Preparation TrainingOperation Heed ITS WarningNever pick up or carry machine while the engine is running Maintenance & StorageAssembly Steps AssemblyLoose Parts List IntroductionImportant The support brackets must be assembled to Outside of the handle- bar assemblyMove Tiller OFF Crate Wheel shaft LInstall Forward Clutch Cable Thread the screw V into the cable adjusterThread the #10-24 hex nut Z, Fig ADD Motor OIL Check Transmission OIL LevelCheck Hardware Check all nuts and screws for tightnessWheel Drive Pins Features ControlsIntroduction Engine ControlsTo operate the Forward Clutch Bail Forward Clutch BailDepth Regulator Lever Reverse Clutch Control Models 643B & 645A onlyTo adjust the handlebars Handlebar Height AdjustmentFeatures and Controls Pre-Start ChecklistIntroduction BREAK-IN Operation Starting and StoppingStopping the Engine and Tiller Release all controls on the tillerOperating the Tiller Reduces tractionStopping the Tiller and Engine FreewheelRead the following recommendations before tilling on slopes Tilling Up and Down Slopes Vertical TillingAvoid Tilling Soggy, Wet Soil Loading and Unloading the Tiller Terrace GardeningTiller Lubrication Maintenance Schedule ProcedureCheck for OIL Leaks Check HardwareBolo Tines Transmission Gear OIL ServiceYou have good footing. Never permit tiller Removing/Installing a Tine AssemblyOnly Replacement Belt InformationDrive Belt Tension Models 643B & 645A To Check Reverse Belt TensionSpark Plug Service Engine Cleaning AIR Cleaner Service Engine OIL ServiceOFF-SEASON Storage To Check the Engine Oil LevelTrouble Shooting Warranty Page Parts List Pièces Détachées Adressez-vous au «Service après-vente»La page 2 pour ce qui concerne les pièces et/ou accessoires Use as required to obtain between Part Description RÉF Pièce Page Part Description RÉF Pièce For parts and/or accessories refer to customer support on Page Juridictions les selon GarantieDépannage Teur -CARBURATEUR/RÉGULA DU Réglages Bougie LA DE EntretienLles -ÉTINCE-PARE L’ÉCRAN DE Entretien Moteur à l’huile changer Pour .BAIR À Filtre DU Entretien Moteur À L’HUILE DE VidangeMoteur DU Nettoyage Intérieur blocage de l’écrou serrez et tourner deMarche LA DE Courroie LA DE Sion Seulement 645A et 643B Modèles ArrièreTEN LA DE Réglage ET Vérification Avant Marche LABolo Dents AvantDents ArbreFond Pas ne pour niveau le fréquemment VérifiezMission Trans LA DE Engrenages Pour HuileEntretien Motoculteur DU Déchargement ET Chargement UtilisationCorporelles blessures Dents des NettoyageSauf déconseillons Risques des présenterDétrempée Terre la pulvériserTerre une travailler de Évitez Les laissez et travaillant en détendu Soyez .b Corporelles Blessures des et matériels dégâts desMotoculteur, du contrôle de perte la Profondeur en plus dents les travaillerTerre la Séparément fournie moteur duTravail Chine Faites NeRéglage Des ou corporelles blessures des entraîner Matériels dégâtsPeut avertissement cet de respect non Le Travailler à prêt soyez vous que ce jusqu’àCette Avant Marche LA DE D’EMBRAYAGE BarreRoues DES D’ENTRAÎNEMENT Goupilles Moteur DU CommandesAssemblage Moteur’HUILE Plein Étape Septième Incorrecte tension Remarque Installa Étape QuatrièmeAvant Marche LA DE ’EMBRAYAGE Câble DU TionMoto LE Sortir Étape Troisième Caisse LA DE CulteurRemarque Détachées pièces des ListeResponsabilité Votre SYMBOLE! CE Accompagne QUI L’AVERTISSEMENTRemisage et Entretien RespectezFonctionnement SYMBOLE! CE Accompagne QUI L’AVERTISSEMENT RespectezPréparation Général en UtilisationCommandes et Caractéristiques DépannageSaison hors Remisage et Entretien 02/24/2006 772C0845 ’UTILISATION Notice

643B, 643C, 645A specifications

The Bolens 645A, 643C, and 643B are celebrated models in the lineup of Bolens garden tractors, known for their durability and versatility. These machines, produced during the 1970s and 1980s, are vintage favorites for homeowners and garden enthusiasts seeking rugged equipment for their gardening needs.

The Bolens 645A is especially noted for its robust build and powerful performance. Equipped with a 7-horsepower engine, the 645A can tackle a variety of tasks, from mowing to snow removal, making it a multipurpose tool in any garden or landscape. One of the main features of the 645A is its hydrostatic transmission, which allows for seamless speed adjustments, providing exceptional maneuverability in tight spaces and varied terrain.

Similarly, the Bolens 643C and 643B models boast impressive features and capabilities. The 643C is renowned for its compact yet powerful 6-horsepower engine. It includes a gear-driven transmission, which offers reliable power transfer and increased efficiency while operating under demanding conditions. The steady performance of the 643C makes it ideal for smaller properties, where precision and control are paramount.

The 643B, while slightly less powerful than its sibling, still holds its own with a solid 5-horsepower engine. It is particularly favored for its ease of use and relatively low maintenance requirements, making it a perfect choice for casual gardeners or those new to the world of garden tractors. Its straightforward controls and simple mechanisms ensure that users can quickly learn to operate it proficiently.

All three models are engineered with a focus on user comfort. The seating is designed ergonomically, allowing users to operate for extended periods without discomfort. Additionally, the accessibility for maintenance tasks is a notable characteristic, ensuring that both professional and amateur gardeners can perform regular upkeep with ease.

In terms of technology, these models utilize straightforward mechanical designs with minimal electronic components, which reduces the likelihood of breakdowns and simplifies repairs. The rugged construction of the chassis and attachments demonstrates Bolens' commitment to longevity and resilience, making these tractors a solid investment for any gardening enthusiast.

In summary, the Bolens 645A, 643C, and 643B models stand out in the garden tractor market due to their powerful engines, user-friendly designs, and robust construction. They represent a blend of efficiency and reliability, catering to a wide range of gardening tasks and maintaining a loyal following among vintage equipment enthusiasts.
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