Makita DCS 7900, DCS6401, DCS 7901, DCS 7300 Saw chain cutter sharpness, To avoid kickback, Object

Page 10

Many factors influence the occurence and force of the kickback reaction. The type of bar and saw chain you use is a factor in the force of the kickback reaction.

The speed of contact at which the cutter contacts

the object.

Kickback force increase with the rate of impact.

The contact angle between the nose of the bar and the foreign object (fig. 11).

Kickback is most pronounced in the upper quadrant of the bar nose.

MAKITA chain types are designed to reduce kickback forces.

The depth gauges:

Improper lowering of the depth gauges also increases the risk of a kickback.

Saw chain cutter sharpness:-

WARNING!

A dull improperly sharpened chain may increase the risk of kickback. Always cut with a properly sharpened chain.

Devices for reducing the risk of kickback injury

MAKITA have developed a special chain brake to reduce the risk of kickbacks.

This chain brake increases the safety factor on the job, e.g. when the saw suddenly bucks upwards the chain stops rotating within a fraction of a second. A deflection guard on the disengaging lever of the chain brake and a scoop rear handle ensure that the opera- tor’s hands are fully protected at all times.

Kickback tendency increases as the radius or size of the guide bar nose increases. MAKITA have devel- oped guide bars with small nose radius, to reduce the kickback tendency.

WARNING!

No chain brake prevents kickback.

These brakes are designed only to stop the chain, if activated.

To ensure a proper operation of the chain brake, it must be properly maintained. Furthermore, there must be a sufficientdistance betweenthe operator

and the bar to ensure that the chain brake has sufficienttime to activate and stop the chain before potential contact with the operator.

I

113

I

13

To avoid kickback

The best protection from personal-injury that may result from kickback is to avoid kickback situations:

1.Hold the chain saw firmly with both hands and maintain a secure grip.

2.Be aware of the location of the guide bar nose at all times.

3.Never bring the nose of the guide bar in contact with any object. Do not cut limbs with the nose of the guide bar. Be especially careful with small, tough limbs, small size brush and saplings which may easily catch the chain.

4.Don’t overreach.

5.Don’t cut above shoulder height.

6.Begin cutting and continue at full throttle.

7. Cut only one log at a time.

,

8.Use extreme caution when re-entering a previous cut.

9.Do not attempt plunge cuts (see page 13) if you are notexperiencedwith these cuttingtechniques.

I O . Be alert for shifting of the log or other forces that may cause the cut to close and pinch the chain.

11.Maintain saw chain properly. Cut with a correctly sharpened, properly tensioned chain at all times.

12.Stand to the side of the cutting path of the chain saw.

10

Page 9 Page 11
Image 10
Page 9 Page 11
Contents Manuel d’emploi et de securite DCS 6400,6401,7300,7301,7900,7901 Contents Page Additional safety precautions Safety precautions for chain saw operatorsWARNlNGf Ansi B175.1-2000Compliance with Ansi -Standards Physical ConditionUse of the saw Transporting the chain sawChain saw operating instructions Working conditions Cutting instructionsReactiveforces duringthe cut, includingkickback KickbackMost common reactive forces are Kickback Pushback Pull-in Speed of contact at which the cutter contacts Saw chain cutter sharpnessTo avoid kickback ObjectTo avoid pull-in PushbackTo avoid pushback FellingNoise of your engine may drown any warning call Then, determine the placement of the felling notchFelling instructions First CutSectioning Method Plunge-Cut MethodBegin the felling cut slighty higher than the felling Limbing BuckingCross cut By your Makita service shop only Maintenance and RepairAttempt any maintenance or repair work not de Maintaining and storing the sawDenomination of components Identification plate Muffler with spark arrester screenTechnical data Putting Into Operation Mounting the guide bar and saw chainTightening the saw chain Checking the chain tension Releasing the chain brakeFuel Gasoline 50l 40lGuide RefuellingEngine must be switched off Adjusting the chain lubricationChecking the chain lubrication Warm starting Starting the engineCold-starting Stopping the engineAdjusting the carburetor Working in winter025 65 mm Min Sharpening the saw chainFiles and how to work with them FileCleaning the brake band and sprocket interior Replacing the saw chain Cleaning the guide barReplacing the suction head Cleaning the air filter Checking the ignition spark CAREFUL1Injury hazard! The return spring can pop out Replacing the starter cable Replacing the return springReplacing the return spring Mounting the fan housing Replacinglcleaning the spark arrester screenInstructions for periodic maintenance Service, spare parts and guaranteeMalfunction System Observation GuaranteeSpare parts CauseDCS 7300,7301 Extract from the spare parts listDCS 7900,7901 Page DCS 6400,6401,7300,7301 , 7900,7901 Additionnels Mesures de securite supplementaires Condition physique Porter le casque, les lunettes et acoustiques de protection Utilisation de la tronGonneuseTransport de la tronqonneuse Demarrage Ravitaillementen carburantInstructionsde ravitaillement @ @ Instructions de coupe ’huile ou de graisseIA-A Choc de recul KickbackLaforce de choc derecul est proportionnelleaI’impact AffQtage des plaquettes de coupe de la ChalnePour eviter le choc de recul Les limiteurs de profondeursPour eviter la traction Le reculPour eviter le recul AbattageInstructions d’abattage Methode de sectionnement Methode de coupe en plongeeEbranchage DebitageEntretien et stockage de la tronqonneuse Entretien et reparationCouDe transversale Designation des pieces Silencieux avec pare-etincellesCaracteristiques techniques Mise EN Route Montage du guide et de la chaine de sciageTendre la chaine de sciage Enclencher le frein de chaine bloquer ContrBle de la tension de la chaineFrein de chaine Liberer le frein a mainMelange carburant CarburantsHuile de chaine de sciage Remplissage des reservoirs Remarque importante pour les huiles de chaine de sciage bioRemarque Verifier le graissage de la chaineReglage du graissage de la chaine0 Effectuer que si le moteur est arrete! StopDemarrer le moteur Verifier le frein de chaineReglage du carburateur Mincll. .ll~.,ral Affirtage de la chaine de sciageLime et guidage de la lime NettoyerIinterieurde labandedefrein dechaine Et de la roue a chaineNettoyer le guide de la chaine Remplacement de la crepine daspirationNouvelle chaine de sciage Nettoyage du filtre d’air Ne pas nettoyer le filtre a air a I’essenceRemplacement de bougie Verification de I’etincelle d’allumagePage Nettoyage de I’espace cylindre Montage du carter du ventilateurChangement I nettoyage du pare-etinceiles Indications de maintenance et d’entretien periodiques AockagePieces de rechange GarantieExtrait de la liste des pieces de rechange DCS 6400,6401 DCS 7300, 7301 DCS 7900Page Makita Canada Inc Dolmar Division Forbes Street Whitby, Ontario Canada, L I N

DCS 7301, DCS 7900, DCS 6400, DCS 7300, DCS 7901 specifications

Makita, a leading manufacturer of power tools, has a robust lineup of professional-grade chainsaws, including the DCS 7900, DCS 7901, DCS 7300, DCS 7301, and DCS 6401 models. Each chainsaw is designed with advanced technology to meet the demanding needs of forestry and construction professionals.

The Makita DCS 7900 is a powerful chainsaw equipped with a 79cc engine that delivers high cutting performance. It features a lightweight design combined with a powerful engine, allowing for maximum maneuverability. The saw's decompression valve ensures easy starting, while the adjustable chain oiler provides lubrication tailored to various cutting conditions. Its anti-vibration technology minimizes user fatigue during prolonged use, making it an excellent choice for professionals.

The DCS 7901 is an enhanced version of the DCS 7900, featuring an electronically controlled ignition system that optimizes fuel combustion for increased efficiency and lower emissions. This model maintains the same robust power but with improved fuel economy, making it an environmentally friendly option without sacrificing performance. The DCS 7901 also includes a heavy-duty air filter system, ensuring longer operation times by extending the life of the engine.

The DCS 7300 and DCS 7301 models are mid-range chainsaws that deliver exceptional power and versatility. The DCS 7300 features a 73cc engine, offering a perfect balance of weight and power, ideal for both felling and limbing. The DCS 7301 shares similar specifications with the DCS 7300 but includes additional features such as a tool-less chain adjustment system and a larger fuel tank for increased run time. Both models come with advanced anti-vibration technologies that ensure smooth operation.

Finally, the Makita DCS 6401 is a compact yet powerful chainsaw designed for users who require maneuverability without compromising on power. Equipped with a 64cc engine, this chainsaw is suitable for a variety of cutting tasks. It features a lightweight construction, making it ideal for prolonged use in tight spaces. The DCS 6401 also has a high-performance air filtration system, which increases engine life and efficiency.

In summary, all Makita chainsaws in this lineup are designed with user comfort and efficiency in mind. With powerful engines, advanced technology, and robust features, the DCS 7900, DCS 7901, DCS 7300, DCS 7301, and DCS 6401 ensure reliability and performance for professional users in demanding environments.
Top Page Image Contents