Jonsered GR50 Operator's Manual
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Jonsered GR50 Operator's Manual

Epa
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Operator's manual (EPA)
Please read the operator's manual
carefully and make sure you
understand the instructions before
using the machine.
GR41 GR50 RS44 RS52

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Summary of Contents for Jonsered GR50

  • Page 1 Operator’s manual (EPA) Please read the operator’s manual carefully and make sure you understand the instructions before using the machine. GR41 GR50 RS44 RS52...

  • Page 2: Key To Symbols

    Symbols WARNING! Clearing saws, brushcutters and trimmers can be dangerous! Careless or incorrect use can result in serious or fatal injury to the operator or others. Please read the operator’s manual carefully and make sure you understand the instructions before using the machine. Always wear: •...

  • Page 3: Table Of Contents

    It is extremely important that you read and understand the contents of this operator’s manual. JONSERED HUSKVARNA SWEDEN IMPORTANT ENGINE INFORMATION THIS ENGINE CONFORMS TO U.S. FOR SMALL NON - ROAD ENGINES.

  • Page 4: Introduction

    Good luck on using your Jonsered machine! Jonsered has a policy of continuous product development and therefore reserves the right to modify the design and appearance of products without prior notice.

  • Page 5: What Is What

    What is what on the clearing saw? (RS44) 1 Blade 2 Grease filler cap, bevel gear 3 Bevel gear 4 Cutting attachment guard 5 Shaft 6 Handlebar 7 Throttle control 8 Stop switch 9 Throttle lock 10 Support eyes for harness 11 Cylinder cover 12 Starter handle 13 Fuel tank...

  • Page 6: What Is What On The Clearing Saw? (Rs52)

    What is what on the clearing saw? (RS52) 1 Blade 2 Grease filler cap, bevel gear 3 Bevel gear 4 Cutting attachment guard 5 Shaft 6 Handlebar 7 Throttle control 8 Stop switch 9 Throttle lock 10 Support eyes for harness 11 Cylinder cover 12 Starter handle 13 Choke control...

  • Page 7: General Safety Precautions

    GENERAL SAFETY PRECAUTIONS Important IMPORTANT! The machine is only designed for trimming grass, grass clearing and/or forestry clearing. The only accessories you can operate with this engine unit are the cutting attachments we recommend in the chapter on Technical data. Never use the machine if you are tired, if you have drunk alcohol, or if you are taking medication that could affect your vision, your judgement or your co-ordination.

  • Page 8: Machine ' S Safety Equipment

    GENERAL SAFETY PRECAUTIONS Machine ′ ′ ′ ′ s safety equipment This section describes the machine ′ s safety equipment, its purpose, and how checks and maintenance should be carried out to ensure that it operates correctly. See the ”What is what?”...
  • Page 9 GENERAL SAFETY PRECAUTIONS Cutting attachment guard This guard is intended to prevent loose objects from being thrown towards the operator. The guard also protects the operator from accidental contact with the cutting attachment. Check that the guard is undamaged and not cracked. Replace the guard if it has been exposed to impact or is cracked.
  • Page 10 GENERAL SAFETY PRECAUTIONS For mufflers it is very important that you follow the instructions on checking, maintaining and servicing your machine. See instructions under the heading Checking, maintaining and servicing the machine’s safety equipment. Never use a machine that has a faulty muffler. Regularly check that the muffler is securely attached to the machine.

  • Page 11: Cutting Equipment

    GENERAL SAFETY PRECAUTIONS Cutting equipment This section describes how to choose and maintain your cutting equipment in order to: • Reduce the risk of blade thrust. • Obtain maximum cutting performance. • Extend the life of cutting equipment. IMPORTANT! Only use cutting attachments with the guards we recommend! See the chapter on Technical data.

  • Page 12: Trimmer Head

    GENERAL SAFETY PRECAUTIONS • Sharpen all edges equally to maintain the balance of the blade. WARNING! Always discard a blade that is bent, twisted, cracked, broken or damaged in any other way. Never attempt to straighten a twisted blade so that it can be reused. Only use original blades of the specified type.

  • Page 13: Assembly

    Assembling the handlebar and throttle • Unscrew the knob from the handlebar mounting. • Position the handlebar as shown. Fit the mounting components and tighten the knob lightly. • Fit the right handle to the handlebar using the screw, washer, sleeve and nut as shown. Tighten. •...

  • Page 14: Fitting The Blade Guard And Saw Blade

    • Fit the support flange (F) on the output shaft. Make sure that the blade is centered by fitting it to the guide on the support flange. • Screw the support cup (E) onto the output shaft threads (CAUTION! Left-hand thread). Tighten to a torque of 35- 50 Nm (3.5-5.0 kpm).

  • Page 15: Fitting Other Guards And Cutting Attachments

    • Tighten the trimmer head to a torque of 35-50 Nm (3.5-5 kpm). • To dismantle, follow the instructions in the reverse order. Fitting other guards and cutting attachments Fit the trimmer guard/combination guard (A) intended for use with the trimmer head/plastic blades. Secure the trimmer guard using the 4 screws (L) and the support plate (M) as shown.

  • Page 16: Vector Harness

    2 Grass clearing The machine should be supported in a harness when grass clearing so that the cutting equipment is parallel to the ground. Vector harness Safety release Push down the red release lever to release the machine from the harness. Adjusting the harness 1 Tighten the hip strap so that it sits securely.

  • Page 17: Fuel Handling

    When working at continuous high revs a higher octane rating is recommended. Two-stroke oil • For best results and performance use JONSERED two- stroke engine oil, which is specially formulated for our air- cooled two stroke-engines. • Never use two-stroke oil intended for water-cooled engines, sometimes referred to as outboard oil (rated TCW).

  • Page 18: Fueling

    Mixing • Always mix the gasoline and oil in a clean container intended for fuel. • Always start by filling half the amount of the gasoline to be used. Then add the entire amount of oil. Mix (shake) the fuel mixture. Add the remaining amount of gasoline. •...

  • Page 19: Starting And Stopping

    STARTING AND STOPPING Check before starting • Check the blade to ensure that no cracks have formed at the bottom of the teeth or by the centre hole. The most common reason why cracks are formed is that sharp corners have been formed at the bottom of the teeth while sharpening or that the blade has been used with dull teeth.
  • Page 20 STARTING AND STOPPING Starting WARNING! When the engine is started with the choke in either the choke or start throttle positions the cutting attachment will start to rotate immediately. Hold the body of the machine on the ground using your left hand (CAUTION! Not with your foot!).

  • Page 21: Working Techniques

    General working instructions IMPORTANT! This section describes the basic safety precautions for working with clearing saws and trimmers. If you encounter a situation where you are uncertain how to proceed you should ask an expert. Contact your dealer or your service workshop. Avoid all usage which you consider to be beyond your capability.
  • Page 22 • Work systematically to and fro across the area, clearing a width of around 4-5 m on each pass. This exploits the full reach of the machine in both directions and gives the operator a convenient and varied working area to work in. •...
  • Page 23 • With groups of hardwood stems, first clear around the group. Start by cutting the stems high up around the outside of the group to avoid jamming. Then cut the stems to the required height. Now try to reach in with the blade and cut from the centre of the group.
  • Page 24 Sweeping • The fan effect of the rotating cord can be used for quick and easy clearing up. Hold the cord parallel to and above the area to be swept and move the tool to and fro. • When cutting and sweeping you should use full throttle to obtain the best results.

  • Page 25: Maintenance

    Carburetor Your Jonsered product has been designed and manufactured to specifications that reduce harmful exhaust fumes. The engine will be run in after it has used 8-10 tanks of fuel. To ensure that the engine runs at peak performance and...
  • Page 26 Do not use the machine until it has been correctly adjusted or repaired. High speed jet H (GR41, GR50, RS44) The high speed jet H affects the engine power, speed, temperature and fuel consumption. If the high speed jet H is set too lean (screwed in too far) the engine speed will be too high and cause engine damage.

  • Page 27: Muffler

    Correctly adjusted carburetor When the carburetor is correctly adjusted the machine will accelerate without hesitation and burble a little at maximum speed. It is also important that the cutting attachment does not rotate at idle. If the low speed jet L is set too lean it may cause starting difficulties and poor acceleration.

  • Page 28: Bevel Gear

    Use of the wrong spark plug can damage the piston/cylinder. Check that the spark plug is fitted with a suppressor. IMPORTANT! Use only JONSERED replacement parts. Use of other brands of replacement parts can cause damage to your unit or injury to the operator or others. Your warranty does not cover damage or liability caused by the use of accessories and/or attachments not specifically...

  • Page 29: Maintenance Schedule

    Maintenance schedule The following is a list of the maintenance that must be performed on the machine. Most of the items are described in the Maintenance section. The user must only carry out the maintenance and service work described in this manual. More extensive work must be carried out by an authorised service workshop.

  • Page 30: Technical Data Technical Data

    Technical data Technical data Engine Cylinder displacement, cu.in/cm Cylinder bore, inch/mm Stroke, inch/mm Idle speed, rpm Recommended max. speed, rpm Speed of output shaft, rpm Max. engine output, acc. to ISO 8893 Catalytic converter muffler Ignition system Manufacturer/type of ignition system Spark plug Electrode gap, inch/mm Fuel and lubrication system...

  • Page 31: Federal Emission Control Warranty Statement

    Operator′s Manual. Jonsered recommends that you retain all receipts covering maintenance on your small nonroad engine, but Jonsered cannot deny warranty solely for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance. As the small nonroad engine owner,...
  • Page 32 Trimmy SII ~ 15 cm 35-50 NM 7,0 m 12 cm 5" ~ 3,5 m "Clic"...
  • Page 34 Auto 55 2,7 mm - 9,0 m 3,0 mm - 7,5 m 3,3 mm - 6,0 m 15 cm 6" ´®z+R!o¶5*¨ ´®z+R!o¶5*¨ 15 cm 6" 15 cm 15 cm 6" >1,1 Kw <1,1 Kw 6"...
  • Page 36 1150017-95 ´®z+R!o¶5*¨ ´®z+R!o¶5*¨ 2005-09-28...

This manual is also suitable for:

Gr41Rs52Rs44

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