Ryobi RY52907, RY52604 Chain Tension, Replacing the BAR and Chain, Idle Speed Adjustment

Page 15

MAINTENANCE

CHAIN TENSION

See Figures 13 - 14.

WARNING:

To avoid possible serious injury, never touch or adjust the chain while the engine is running. The saw chain is very sharp; always wear protective gloves when performing maintenance to the chain.

nStop the engine before setting the chain tension. Make sure the guide bar nut is loose to finger tight, turn the chain tensioning screw clockwise to tension the chain. Refer to Replacing the Bar and Chain for additional information.

NOTE:  A cold chain is correctly tensioned when there is no slack on the underside of the guide bar, the chain is snug, but it can be turned by hand without binding.

nChain must be re-tensioned whenever the flats on the drive links hang out of the bar groove as shown in figure 13.

nDuring normal operation, the temperature of the chain will increase. The drive links of a correctly tensioned warm chain will hang approximately .050 in. out of the bar groove, as shown in figure 14.

NOTE: New chain tends to stretch; check chain tension frequently and tension as required.

CAUTION:

Chain tensioned while warm, may be too tight upon cool- ing. Check the “cold tension” before next use.

REPLACING THE BAR AND CHAIN

See Figures 15 - 20.

WARNING:

To avoid possible serious injury, stop engine before re- placing the bar, chain, or performing any maintenance operation.

nRemove the bar nut and drivecase cover.

nThe bar contains a bar stud slot that fits over the bar stud. The bar also contains a chain tensioning pin hole which fits over the chain tensioning pin.

nPlace the bar onto the bar stud so that the chain tensioning pin fits into the chain tensioning pin hole.

nFit the chain over the sprocket and into the bar groove. The cutters on the top of the bar should face toward the bar tip, in the direction of the chain rotation.

nReplace the drivecase cover and install the bar nut. Tighten the bar nut finger tight only. The bar must be free to move for tension adjustment.

nRemove all slack from chain by turning the chain tensioning screw clockwise, assuring that the chain seats into the bar groove during tensioning.

nLift the tip of the bar up to check for sag. Release the tip of the bar, and turn the chain tensioning screw 1/2 turn clockwise. Repeat this process until sag does not exist.

nHold the tip of the bar up and tighten the bar nut securely.

nChain is correctly tensioned when there is no slack on the underside of the bar, the chain is snug, but it can be turned by hand without binding.

NOTE: If chain is too tight, it will not rotate. Loosen the bar nut slightly and turn adjusting screw 1/4 turn counter- clockwise. Lift the tip of the bar up and retighten bar nut.

IDLE SPEED ADJUSTMENT

See Figure 21.

If the chain turns at idle, the idle speed screw needs adjusting on the engine. Turn the idle speed screw counterclockwise to reduce the idle RPM and stop the chain movement. If the saw chain still moves at idle speed, contact a service dealer for adjustment and discontinue use until the repair is made.

WARNING:

The saw chain should never turn at idle. Turn the idle speed screw counterclockwise to reduce the idle RPM and stop the chain, or contact a service dealer for ad- justment and discontinue use until the repair is made. Serious personal injury may result from the saw chain turning at idle.

AUTOMATIC BAR AND CHAIN LUBRICATION

See Figure 22.

nUse Premium Bar and Chain Lubricant. It is designed for chains and chain oilers and is formulated to perform over a wide temperature range with no dilution required.

nRemove the cap and carefully pour approximately 8 oz. of bar and chain lubricant into the bar lube reservoir.

nReplace the cap and tighten securely.

nCheck and refill the bar lube reservoir every time the engine is fueled.

NOTE:  Do not use dirty, used or otherwise contaminated lubricant. Damage may occur to the oil pump, bar, or chain.

CHAIN MAINTENANCE

See Figure 23.

For smooth and fast cutting, the chain needs to be main- tained properly. The following conditions indicate that the chain requires sharpening: 

11 — English

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Contents Toutes LES Versions Todas LAS Versiones Save this Manual for Future ReferenceRY52604 RY52907 Iii Bar nut écrou du guide, tuerca de la barra C DDE Profundidad Raker Depth Gauge ClearanceIntroduction Table of ContentsRead ALL Instructions General Safety RulesRefueling Specific Safety RulesName DESIGNATION/EXPLANATION SymbolsSymbol Symbol Signal MeaningFeatures Packing List AssemblyInstalling the Shoulder STRAP, Hanger and Attachment UnpackingOxygenated Fuels Automatic BAR and Chain LubricationFueling and Refueling the Pruner Premium Exact MIXPreparation for Cutting Basic Cutting ProcedureOperation ApplicationsStarting and Stopping MaintenanceGeneral Maintenance Position for StartingReplacing the BAR and Chain Idle Speed AdjustmentChain Maintenance Chain TensionCleaning the Exhaust Port and Muffler HOW to Sharpen the CuttersCleaning AIR Filter Screen Spark Plug ReplacementTroubleshooting When storing 1 month or longerProblem Possible Cause Remedy Limited Warranty Statement WarrantyMANUFACTURER’S Warranty Coverage Fuel Tank Assy Emissions Maintenance Schedule and Warranted Parts ListThis Product WAS Manufactured with a Catalyst Muffler AIR Filter AssyEnglish Règles DE Sécurité Générales AVERTISSEMENT Lire Toutes LES Instructions Règles DE Sécurité Particulières Ravitaillement EN Carburant LE Carburant EST Extrêmement Inflammable Symboles Symbole Signal SignificationNOM Désignation / Explication Fiche Technique CaractéristiquesDépannage AvertissementVoir les figures 3 Installation du support de la bandoulière Installation de l’accessoire  AssemblageApprovisionnement EN Carburant DE L’ÉLAGUEUSE Mélange Premium ExactCarburants Oxygénés LA Barre Automatique ET Chaîne LA LubrificationAVERTISSEMENT  Préparation Pour LA CoupeMéthode DE Coupe Élémentaire Ébranchage ET ÉmondageEntretien UtilisationEntretien DE LA Chaîne Remplacement DE LA Guide ET ChaîneRéglage DU Ralenti LA Barre Automatique ET Chaîne LA LubrificationRemisage LE Produit Remplacement DE LA BougieNettoyage DU Filtre À AIR Écran Bouchon DU Réservoir AVERTISSEMENT Dépannage Problème Cause SolutionÉnoncé DE LA Garantie Limitée GarantieResponsabilités DU Propriétaire Dans LE Cadre DE LA Garantie Nous Appeler D’ABORD Français Reglas DE Seguridad Generales ¡ADVERTENCIALEA Todas LAS Instrucciones Reabastecimiento DE Combustible Reglas DE Seguridad EspecíficasPrecaución SímbolosPeligro AdvertenciaServicio CaracterísticasMontaje DEL Mango EN J ArmadoDesempaquetado Lista DE EmpaquetadoGasolinalubricante Combustibles OxigenadosLA Barra Automática Y Cadena LA Lubricación Mezcla DE CombustibleDesramado Y Poda UsosPreparación Para EL Corte Procedimiento Básico DE CorteArranque Y Apagado FuncionamientoMantenimiento Posición Para EmpezarPrecaución Reemplazo LA Barra Y CadenaAjuste DE LA Marcha Lenta LA Barra Automática Y Cadena LA LubricaciónTapa DEL Tanque DE Combustible Advertencia Limpieza DEL Orificio DE Escape Y DEL SilenciadorParachispas Limpieza DEL Filtro DE Aire PantallaSolución DE Problemas Problema Causa SoluciónAl almacenar 1 mes o más Declaración DE LA Garantía Limitada GarantíaCobertura DE LA Garantía DEL Fabricante Este Producto SE Fabricó CON UN Silenciador Catalítico Conjunto DE Silenciador Catalítico4050 Notas Élagueuse À GAZ DE 26 CC / Podadora DE Gasolina 26 CC Manuel D’UTILISATION / Manual DEL Operador

RY52907, RY52604 specifications

Ryobi has carved out a prominent niche in the world of outdoor power equipment with its lineup of string trimmers, including the RY52604 and RY52907 models. Both of these tools are designed to cater to the needs of homeowners and gardening enthusiasts, offering a potent blend of performance, convenience, and innovative technology.

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