Bolens 643C, 643B Removing/Installing a Tine Assembly, You have good footing. Never permit tiller

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Figure 5-3: Install tines so that cutting edge of tines enter soil first when tiller moves forward.

5

Maintenance

WARNING

Do not operate tiller on a slope too steep for safe operation. Till slowly and be sure

2.When installing a single tine, be sure to position it so that its cutting edge (sharp) will enter the soil first as the tiller moves forward.

C. Removing/Installing a Tine Assembly:

1.A tine assembly consists of eight tines mounted on a tine holder.

2.If removing both tine assemblies, mark them “left” and “right” before removal. Remove the screw (C, Figure 5-3) and locknut (D) that secure the tine assembly to the tine shaft. If necessary, use a rubber mallet to tap the tine assembly outward off the shaft.

3.Before reinstalling the tine assembly, inspect the tine shaft for rust, rough spots or burrs. Lightly file or sand, as needed. Apply a thin coat of grease to the shaft.

4.Install each tine assembly so that the cutting (sharp) edge of the tines will enter the soil first when the tiller moves forward. Secure the tine assembly to the tine shaft using the screw and locknut

CHECKING AND ADJUSTING FORWARD DRIVE BELT TENSION

It is important to maintain correct tension on the forward drive belt. A loose belt will cause the tines and wheels to slow down — or stop completely — even though the engine is running at full speed. A too tight belt can result in unintentional tine movement when the clutch bail is in the Neutral (released) position.

•Check belt tension after the first two hours of break- in operation and after every 10 operating hours.

•At the end of each tilling season, check the belt for cracks, cuts or frayed edges and replace it as soon as possible.

To Check Forward Belt Tension:

1.Stop engine, wait for all parts to stop moving and disconnect spark plug wire.

2.With the Forward Clutch Bail in an open (released) position, measure and note the overall length of the cable spring (A, Figure 5-4) by measuring from the outermost coil to the outermost coil.

3.Squeeze the Forward Clutch Bail against the handle-

bar (see Figure 5-4) and re-measure the length of the coils. The belt tension is correct if this second measurement is between 1/6” -to- 3/16” longer than the first measurement.

4.If the spring is too short (less than 1/16”), the tension is too loose. If the spring is too long (more than 3/16”), the tension is too tight.

5.To adjust the length of the spring:

a.Release the Forward Clutch Bail.

b.Unthread the hex nut (C, Figure 5-4) halfway up the adjustment screw (D).

c.Unhook the top of the spring from the Forward Clutch Bail.

d.Use pliers to prevent the adjuster (B) from turning and turn the slotted screw located inside the spring clockwise (viewed from operator’s position) to increase tension on the spring. Turn the screw counterclockwise to decrease tension. Once adjusted, reattach the spring to the Forward Clutch Bail.

you have good footing. Never permit tiller

to freewheel down slopes. Failure to fol- low this warning could result in personal injury.

Before clearing the tines by hand, stop the engine, allow all mov- ing parts to stop and disconnect the spark plug wire. Remove the ignition key on electric start models.

Failure to follow this warning could result in personal injury.

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Contents 02/24/2006 772C0845Table of Contents Heed ITS Warning TrainingPreparation OperationNever pick up or carry machine while the engine is running Maintenance & StorageIntroduction AssemblyAssembly Steps Loose Parts ListWheel shaft L Outside of the handle- bar assemblyImportant The support brackets must be assembled to Move Tiller OFF CrateThread the screw V into the cable adjuster Install Forward Clutch CableThread the #10-24 hex nut Z, Fig Check all nuts and screws for tightness Check Transmission OIL LevelADD Motor OIL Check HardwareEngine Controls Features ControlsWheel Drive Pins IntroductionReverse Clutch Control Models 643B & 645A only Forward Clutch BailTo operate the Forward Clutch Bail Depth Regulator LeverTo adjust the handlebars Handlebar Height AdjustmentStarting and Stopping Pre-Start ChecklistFeatures and Controls Introduction BREAK-IN OperationReduces traction Release all controls on the tillerStopping the Engine and Tiller Operating the TillerStopping the Tiller and Engine FreewheelTilling Up and Down Slopes Vertical Tilling Read the following recommendations before tilling on slopesAvoid Tilling Soggy, Wet Soil Loading and Unloading the Tiller Terrace GardeningCheck Hardware Maintenance Schedule ProcedureTiller Lubrication Check for OIL LeaksBolo Tines Transmission Gear OIL ServiceYou have good footing. Never permit tiller Removing/Installing a Tine AssemblyTo Check Reverse Belt Tension Replacement Belt InformationOnly Drive Belt Tension Models 643B & 645ATo Check the Engine Oil Level Engine Cleaning AIR Cleaner Service Engine OIL ServiceSpark Plug Service OFF-SEASON StorageTrouble Shooting Warranty Page Adressez-vous au «Service après-vente» Parts List Pièces DétachéesLa 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 Moteur à l’huile changer Pour .B Bougie LA DE EntretienTeur -CARBURATEUR/RÉGULA DU Réglages Lles -ÉTINCE-PARE L’ÉCRAN DE EntretienIntérieur blocage de l’écrou serrez et tourner de Moteur À L’HUILE DE VidangeAIR À Filtre DU Entretien Moteur DU NettoyageAvant Marche LA Seulement 645A et 643B Modèles ArrièreMarche LA DE Courroie LA DE Sion TEN LA DE Réglage ET VérificationArbre AvantBolo Dents DentsTrans LA DE Engrenages Pour Huile Pas ne pour niveau le fréquemment VérifiezFond MissionEntretien Motoculteur DU Déchargement ET Chargement UtilisationRisques des présenter Dents des NettoyageCorporelles blessures Sauf déconseillonsTerre la pulvériser DétrempéeTerre une travailler de Évitez Profondeur en plus dents les travailler Corporelles Blessures des et matériels dégâts desLes laissez et travaillant en détendu Soyez .b Motoculteur, du contrôle de perte laSéparément fournie moteur du Terre laTravail Faites Ne ChineRéglage Travailler à prêt soyez vous que ce jusqu’à Matériels dégâtsDes ou corporelles blessures des entraîner Peut avertissement cet de respect non LeCette Avant Marche LA DE D’EMBRAYAGE BarreRoues DES D’ENTRAÎNEMENT Goupilles Moteur DU CommandesMoteur Assemblage’HUILE Plein Étape Septième ’EMBRAYAGE Câble DU Tion Installa Étape QuatrièmeIncorrecte tension Remarque Avant Marche LA DEMoto LE Sortir Étape Troisième Caisse LA DE CulteurRemarque Détachées pièces des ListeRespectez SYMBOLE! CE Accompagne QUI L’AVERTISSEMENTResponsabilité Votre Remisage et EntretienGénéral en Utilisation SYMBOLE! CE Accompagne QUI L’AVERTISSEMENT RespectezFonctionnement PréparationDépannage Commandes et CaractéristiquesSaison 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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