Bolens 643C, 643B, 645A warranty Install Forward Clutch Cable, Thread the #10-24 hex nut Z, Fig

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STEP 4: INSTALL FORWARD CLUTCH CABLE

1.Carefully unwrap the forward clutch cable (cable without an attached knob) from its shipping position and slide the thin cable wire (M, Fig. 2-4) into the slot in the cable bracket. Push the cable connector (N, Fig. 2-4) up through the hole in the bracket until the groove in the connector snaps into place.

2.Thread the #10-24 hex nut (Z, Fig.

2-5) halfway onto the screw (V) which runs through the spring (W, Fig. 2-5).

3.Thread the screw (V) into the cable adjuster (X).

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Fig. 2-4: Installing forward clutch cable bracket and cable.

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Assembly

NOTE: Incorrect

4.Check for correct tension on the forward drive belt by taking two measurements of the cable spring, as follows:

a.With the Forward Clutch Bail (Y, Fig. 2-6) in an open (released) position, measure the length of the cable spring (W) from the outermost coil to the outermost coil.

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Fig. 2-5: Cable

Fig. 2-6: Attach forward

spring and

 

clutch cable spring to

adjuster.

 

forward clutch bail.

b.Squeeze the Forward Clutch Bail against the handlebar (see Fig. 2-7) and re-measure the spring length. The belt tension is correct if this second measurement is between 1/16” to 3/16” longer than the first measurement. If so, turn the hex nut (Z, Fig. 2-7) tightly against the cable adjuster (X) while preventing the cable adjuster from turning.

c.If the spring length is incorrect, you must adjust the cable tension as described in Checking and Adjusting Forward Drive Belt Tension in Section 5. Incorrect cable tension can result in belt slippage (cable tension too loose), or unintentional tine movement when the clutch bail is in Neutral (cable tension too tight).

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Fig. 2-7 :To check forward belt tension, take two measure- ments of the length of the coils in the spring — first with the bail open, then with the bail held against the handle- bar.

STEP 5: INSTALL REVERSE CLUTCH CABLE (MODELS 643B AND 645A ONLY)

1.Unwrap the reverse clutch cable (CC, Fig. 2-8 and Fig. 2-9) from its shipping position and route it up to the handlebar. Be sure that the cable is routed beneath the Forward Clutch Bail.

2.Insert the cable (CC, Fig. 2-8) through the slot in the cable bracket and position the flat side of the threaded assembly next to the flat side of the hole. Slide the hex nut (DD) up the cable and tighten it securely.

3.Fasten the reverse clutch cable to the left side handlebar with a cable tie (EE, Fig. 2-9).

4.Test the function of the reverse clutch by pulling out and releasing the cable knob. The knob should return to its neutral position (resting against bracket). If it doesn’t, contact your local dealer.

cable tension can result in belt slippage (cable tension too loose), or unintentional tine movement when the clutch bail is in Neutral (cable tension too tight).

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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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