Jonsered 50C, 70C manual Needle bearing lubrication, Adjustment of the oil pump, Cooling system

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MAINTENANCE

Needle bearing lubrication

The clutch drum is fitted with one of the following drive sprockets:

•A Spur sprocket (the chain sprocket is welded on the drum)

•B Rim sprocket (replaceable)

Both versions have a needle bearing on the drive shaft, which has to be greased regularly (once a week).

CAUTION! Use only high quality bearing grease or engine oil.

Adjustment of the oil pump

The oil pump is adjustable. Adjustments are made by turning the screw using a screwdriver or combination spanner. The machine is supplied from the factory set to 1 turn open. Turning the screw clockwise will reduce the oil flow and turning the screw anti-clockwise will increase the oil flow.

WARNING! The engine must not be running

!when making adjustments.

Recommended settings:

Bar -15": 1 turn from the closed position.

Bar 15" -18": 2 turns from the closed position.

Bar 18" -24": 3 turns from the closed position.

Bar 24" -: 4 turns from the closed position.

These recommendations apply to JONSERED chain oil, for other chain oils increase the oil flow by one step.

Cooling system

To keep the working temperature as low as possible the machine is equipped with a cooling system.

The cooling system consists of:

1Air intake on the starter.

2Air guide plate.

3Fins on the flywheel.

4Cooling fins on the cylinder.

5Cylinder cover (directs cold air over the cylinder).

5

4

3

2

1

Clean the cooling system with a brush once a week, more often in demanding conditions. A dirty or blocked cooling system results in the machine overheating which causes damage to the piston and cylinder.

Centrifugal cleaning “Turbo”

Centrifugal cleaning means the following: All air to the carburettor passes through the starter. Dirt and dust is centrifuged out by the cooling fan.

IMPORTANT! In order to maintain operation of the centrifugal cleaning system it must be regularly maintained.

•Clean the air intake to the starter, the fins on the flywheel, the space around the flywheel, inlet pipe and carburettor compartment.

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Contents Operator’s manual EPA Key to symbols KEY to SymbolsContents EPA Safety Instructions Machine′s safety equipmentPersonal protective equipment Chain brake and front hand guard Throttle lock Stop switchChain catcher Right hand guardChecking brake band wear MufflerChecking the front hand guard Checking the inertia brake releaseThrottle lock Stop switchChain catcher Right hand guardGeneral rules Cutting equipmentCutting equipment designed to minimise kickback MufflerChain Sharpening your chain and adjusting raker clearanceSome terms that describe the bar and chain General information on sharpening cutting teethSharpening cutting teeth General advice on setting raker clearanceTensioning the chain Setting the raker clearanceIf the raker clearance is too large Cause serious or even fatal injuryLubricating cutting equipment What is kickback? How to avoid kickbackChecking wear on cutting equipment Chain drive sprocketDo not let go of the handles Starting General safety precautionsBasic safety rules Fuel safetyGeneral working instructions Transport and storageBasic cutting technique GeneralTerms Limbing CuttingSafe distance Tree felling techniqueFelling direction Clearing the trunk and preparing your retreatFelling cut Freeing a tree that has fallen badly General adviceCutting the trunk into logs Freeing a trapped treeWhat is what on the chain saw? What is WHAT?Fitting the bar and chain AssemblyFuel Handling FuelChain oil Fuelling Starting and stopping Starting and StoppingCold engine Warm engineStopping Carburettor MaintenanceStarter Correctly adjusted carburettorChanging a broken or worn starter cord Tensioning the recoil springSpark plug Air filterMuffler Fitting the starterCentrifugal cleaning Turbo Adjustment of the oil pumpWhen making adjustments Needle bearing lubricationElectrical carburettor heating Heated handlesWinter use CanadaDaily maintenance Weekly maintenance Monthly maintenanceBelow you will find some general maintenance instructions Technical Data Technical dataCS 2171/WH Length, inches Pitch, inch Max nose radius Bar Chain050/1,3 mm 058/1,5mmYour Warranty Rights and Obligations Federal Emission Control Warranty StatementPage 1088917-95

50C, 70C specifications

The Jonsered 70C and 50C chainsaws represent a pinnacle of craftsmanship and engineering excellence in the world of power tools. Designed for both professional and avid DIY enthusiasts, these models offer a blend of power, performance, and user-friendly features that elevate the cutting experience.

At the heart of both the Jonsered 70C and 50C is their powerful engine output. The 70C boasts a robust 70cc engine, delivering high torque and efficiency for demanding tasks, while the 50C is equipped with a nimble 50cc engine, perfect for lighter, more agile cutting projects. This versatility makes the chainsaws suitable for a wide range of activities, from felling trees to limbing and pruning, ensuring that they cater to varying user requirements.

One notable feature of the Jonsered 70C and 50C is their advanced air filtration systems. These systems are designed to enhance the longevity of the chainsaw's engine by preventing dust and debris from entering the combustion area. This means less maintenance and more time spent operating the chainsaw, making it an ideal choice for both professional lumberjacks and casual users.

Ergonomically designed, the handle of both models offers excellent grip and comfort, reducing user fatigue during extended use. The lightweight construction of the saws enables effortless maneuverability and control, allowing users to execute precise cuts without strain. Additionally, the quick and easy chain tensioning system facilitates fast adjustments, ensuring that the chain remains in optimal condition for continuous cutting.

Safety features are paramount in the design of the Jonsered 70C and 50C. Each model incorporates a chain brake and throttle lock to enhance user safety while operating, minimizing risks associated with kickback and accidental starts. The designs also emphasize low vibration, which further protects the user's hands and arms from fatigue, promoting a safer and more enjoyable cutting experience.

With their blend of power, efficiency, and advanced technology, the Jonsered 70C and 50C chainsaws are exceptional tools for anyone seeking reliability and performance in the field. Whether for professional logging or home landscaping, these chainsaws embody the quality and innovation expected from the Jonsered brand.
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