Husqvarna 250PS Operator's Manual

Husqvarna 250PS Operator's Manual

Pruning saws
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Operator's manual
Read these instructions carefully and make sure
you understand them before using the saw.
114 00 07-26


Table of Contents

Summary of Contents for Husqvarna 250PS

  • Page 1 250PS Operator's manual Read these instructions carefully and make sure you understand them before using the saw. 114 00 07-26...
  • Page 2: Symbols

    Symbols WARNING! Pruning saws can be dangerous! Careless or incorrect use can result in serious or fatal injury to the operator or others. WARNING! Observe the applicable safety regulations for work in the vicinity of overhead cables. Read the instructions carefully and make sure you understand them before using the machine.
  • Page 3: Table Of Contents

    WARNING! Under no circumstances may the design of the machine be modified without the permission of the manufacturer. Always use genuine accessories. Non-authorised modifications and/or accessories can result in serious personal injury or the death of the operator or others. WARNING! The machine’s cutting equipment must under no circumstances be connected to...
  • Page 4: Safety Instructions

    Personal protective equipment IMPORTANT INFORMATION • A pruning saw used incorrectly or carelessly can become a dangerous tool that can cause serious or fatal injury to the operator or others. It is extremely important that you read and underst- and the content of this manual. •...
  • Page 5 4. Vibration damp- ing system Your machine is equipped with a vibration damping system, which is designed to give as vibration-free and comfortable use as possible. The machine’s vibration system reduces the transfer of vibrations between the engine unit and the harness. The harness is also well padded at the hip section and has wide shoulder belts...
  • Page 6: Control, Maintenance And Service Of The Machine's Safety Equipment

    Control, maintenance and service of the machine's safety equipment IMPORTANT INFORMATION • All service and repairs to the machine require special training. • This applies especially to the machine's safety equipment. If the machine does not meet any of the controls listed below you should contact your service workshop.
  • Page 7: Cutting Equipment Designed To Minimise Kickback

    5. Cutting equipment This section describes how through correct maintenance and through using the right type of cutting equipment you can: • Obtain maximum cutting capacity. • Increase the service life of the cutting equipment. A. Only use cutting equipment recommended by us! See the ”Technical data”...
  • Page 8: Specification Of Blade And Chain

    Specification of blade and chain When the cutting equipment supplied with your saw becomes worn or damaged you will need to replace it. Use only the type of bar and chain recommended by us. Guide bar • Length (inches/cm) • Number of teeth on bar tip sprocket (T).
  • Page 9 It is very difficult to sharpen a chain correctly without the right equipment. We recom- mend you to use a file gauge. This will help you obtain the maximum kickback reduction and cutting performance from your chain. The following faults will increase the risk of kickback considerably.
  • Page 10: Tensioning The Saw Chain

    D. Correction of raker clearance • When correction of the raker clearance is made the teeth must be newly sharpened. We recommend that you adjust the raker clearance every third time you sharpen the chain. NOTE! This recommendation assumes that the length of the cutting teeth is not reduced excessively.
  • Page 11: Checking Wear On Cutting Equipment

    B. Procedure if the lubrication does not function: 1. Check that the oil channel in the bar is not obstructed. Clean if necessary. 2. Check that the groove in the edge of the bar is clean. Clean if necessary. 3. Check that the bar tip sprocket turns freely.
  • Page 12: General Safety Instructions

    General safety instructions IMPORTANT INFORMATION • The machine is only designed for tree pruning. • The only accessories to be used with the engine unit as a drive source are the cutting units we recommend. • Never use the machine if you are tired, if you have consumed alcohol, or if you are taking medicines that can affect your sight, your judgement or the control of your body.
  • Page 13: General Working Instructions

    Transport and storage • Store and transport the machine and fuel so that any leakage or fumes do not risk coming into contact with sparks or naked flames. For example, electric machines, electric motors, electrical switches/power switches, heaters or the like.
  • Page 14: Basic Clearing Techniques

    Basic clearing techniques • Always work with the engine at full throttle. • Always drop to idling speed after each working operation. Longer periods running at full throttle without loading the engine can lead to serious engine damage. WARNING! Never stand immediately below a branch being cut.
  • Page 15: What Is What

    What is what? Cylinder cover Start unit Fuel tank Start handle Choke control/start throttle lock Air filter cover Suspension fitting Hydraulic oil tank Quick-couplings 10. High-pressure hose and return hose 11. Cabling, ignition/throttle control 12. Stop switch. 13. Throttle control lock. WHAT IS WHAT? 14.
  • Page 16: Assembly

    WARNING! The cutting equipment of the pruning saw may under no circumstances be connected to another type of hydraulic pump than what it is constructed for. Connecting the hydraulic hoses NOTE! The hydraulic hoses and hydraulic oil tank’s quick- couplings must be clean and free from impurities.
  • Page 17: Fuel Handling

    Twostroke oil • For the best results use Husqvarna twostroke oil. Mixing ratio 1:50 (2%). • If Husqvarna twostroke oil is not available, you may use another two- stroke oil of good quality that is intended for air cooled engines. Contact your dealer when selecting an oil.
  • Page 18: Hydraulic Oil

    FUEL HANDLING – START AND STOP • Clean around the fuel cap. Contamination in the tank can disrupt opera- tions. • Ensure that the fuel is well mixed by shaking the container before filling the tank. Hydraulic oil ISO VG 32 hydraulic oil is recommended where the air temperature is below 20ºC.
  • Page 19: Start

    WARNING! Starting with the start throttle function connected can give an uncontrolled activation of the cutting equipment. Start Press the machine body to the ground with the left hand. (NOTE: Not with the foot!) Grip the start handle, pull the start line slowly out with the right hand until a resistance is felt (the start hooks engage) and then make...
  • Page 20: Maintenance

    Carburettor Your Husqvarna product has been designed and manufactured to specifications that reduce harmful emissions. After your unit has been run 8-10 tanks of fuel the engine has broken in. To ensure that your unit is at peak performance and producing the least amount of harmful...
  • Page 21: Air Filter

    Correctly adjusted carburettor A correctly adjusted carburettor implies that the engine accelerates without a pause and that the engine splutters slightly at full throttle. Also, the chain does not rotate at idling speed. An excessively lean setting for the L-nozzle can result in starting difficulties and poor acceleration.
  • Page 22: Cooling System

    Cooling system To maintain as low an operating temperature as possible the engine is equipped with a cooling system. The cooling system consits 1. An air intake on the starter unit. 2. Fins on the flywheel. 3. Cooling fins on the cylinder. 4.
  • Page 23 Weekly maintenance 1.Check the starter, the starter cord and the return spring. 2.Make sure that the vibration damping elements are not damaged. 3.Clean the outside of the spark plug. Remove and check the electrode gap. Adjust the gap to 0.5 mm (.020") or change the spark plug.
  • Page 24: Technical Data

    Technical data Engine Cylinder capacity, cm Cylinder bore, mm Stroke, mm Idling speed, rpm Recommended race speed, rpm Max. engine output, acc. to. ISO 8893 Hydraulic transmission Hydraulic motor, capacity, cm /rev Hydraulic pump, capacity, cm /rev Working pressure, high pressure hose, bar 130 Flow, l/min Ignition system Manuafacturer/type of ignition system...
  • Page 25 Bar and chain combinations The following combinations are CE approved. Length, Pitch, Max. no of teeth inches inches on tip sprocket Type Inch Inch/mm 90 SG 3/8" 0,028"/1,1 TECHNICAL DATA Chain Oregon 90 SG Oregon 90 SG Inch/mm Angle Angle 5/32"...
  • Page 26 We, Husqvarna AB, S-561 82 Huskvarna, Sweden, tel. +46 36-146500, declare under sole responsibility that the pruner Husqvarna 250PS from the serial numbers of 1997 and onwards (the year is clearly stated in plain text on the type plate with subsequent serial number), is in conformity with the following standards or other normative documents following the provisions in the COUNCIL’S DIRECTIVES:...
  • Page 27 English –...
  • Page 28 ´+HÆh¶6v¨ 2001W14 – English...

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