Hitachi CH 50EA3 (ST)/CH 55EB3 (ST) Trimmer User Manual
Contents
1. HITACHI Hedge Trimmer Model CH 50EA3 ST CH 55EB3 ST CH 62EA3 ST CH 66EB3 ST CH 78EC3 ST Handling instructions ote efore using this machine carefully read through these HANDLING INSTRUCTIONS to ensure ici eration It is recommended that these INSTRUCTIONS be kept readily available as using this machine i O ES Hitachi Koki 970 83301 200 2009 12 OOOBook_CH50EA3_ENG indb 1 lt 2009 12 21 1 I MEANINGS OF SYMBOLS NOTE Some units do not carry them Symbols N WARNING The following show symbols used for the machine Be sure that you understand their meaning before use It is important that you read fully understand and observe the following safety precautions and warnings Careless or improper use of the unit may cause serious or fatal injury Read understand and follow all warnings and instructions in this manual and on the unit Always wear eye head and ear protectors when using this unit 000Book CH5OFA3 ENG indb 2 Before using your machine Read the manual carefully Check that the cutting equipment is correctly assembled and adjusted Start the unit and check the carburetor adjustment See MAINTENANCE Contents WHAT IS WHAT WARNINGS AND SAFETY INSTRUCTIONS SPECIFICATIONS OPERATING PROCEDURES MAINTENANCE NOOR O 2009 12. O Engine power reduction Unnecessary wear on the engine parts O Abnormal fuel consumption Clean the air filter daily or more often if working in exceptionally dusty areas Fig 10 Cleaning the air filter Remove the air filter cover and the filter Rinse it in warm soap suds Check that the filter is dry before reassembly An air filter that has been used for some time cannot be cleaned completely Therefore it must regularly be replaced by a new one A damaged filter must always be replaced NOTE Saturate the element in 2 cycle oil or the equivalent Squeeze the element to distribute the oil completely and to remove any excess oil Spark plug Fig 11 The spark plug condition is influenced by O An incorrect carburetor setting O Wrong fuel mixture too much oil in the gasoline A dirty air filter Hard running conditions such as cold weather These factors cause deposits on the spark plug electrodes which may result in malfunction and starting difficulties If the engine is low on power difficult to start or runs poorly at idling speed always check the spark plug first If the spark plug is dirty clean it and check the electrode gap Readjust if necessary The correct gap is 0 6 mm The spark plug should be replaced after about 100 operation hours or earlier if the electrodes are badly eroded NOTE In some areas local law requires using a resistor spark plug to suppress ignition signals If th
3. Fig 8 MAINTENANCE MAINTENANCE REPLACEMENT OR REPAIR OF THE EMISSION CONTROL DEVICES AND SYSTEM MAY BE PERFORMED BY ANY NONROAD ENGINE REPAIR ESTABLISHMENT OR INDIVIDUAL Carburetor adjustment Fig 9 WARNING O The cutting attachment may be spinning during carburetor adjustments Never start the engine without the complete clutch cover Otherwise the clutch can come loose and cause personal injuries In the carburetor fuel is mixed with air When the engine is test run at the factory the carburetor is adjusted A further adjustment may be required according to climate and altitude The carburetor has one adjustment possibility T Idle speed adjustment screw Idle speed adjustment T Check that the air filter is clean When the idle speed is correct the cutting attachment will not rotate If adjustment is required close clockwise the T screw with the engine running until the cutting attachment starts to rotate Open counter clockwise the screw until the cutting attachment stops You have reached the correct idle speed when the engine runs smoothly in all positions well below the rpm when the cutting attachment starts to rotate If the cutting attachment still rotates after idle speed adjustment contact Hitachi dealer 2009 12 21 17 35 3 Air filter Fig 10 The air filter must be cleaned from dust and dirt in order to avoid O Carburetor malfunctions O Starting problems
4. 00900 g004 Fueling Fig 4 Fig 1 Always start by filling half the amount of fuel which is to be used Then add the whole amount of oil Mix shake the fuel mixture Add the remaining amount of fuel Mix shake the fuel mix thoroughly before filling the fuel tank 2 With the throttle trigger lockout 3 pressed pull throttle trigger S WARNING Fig 2 then slowly release throttle the trigger first then the throttle O Always shut off the engine before refueling eod N Slowly open the fuel m 1 when filing up with fuel so that This will lock the throttle in starting position ossible over pressure disappears 19 m Tighten after fasi Set choke lever 5 to CLOSED position B Fig 5 O Always move the unit at least 3 m from the fueling area before starting gt me Fig 5 000000000 I 4 Pullrecoil starter briskly taking care to keep the handle in your Fig 2 grasp and not allowing it to snap back Fig 6 Before fueling clean the tank cap area carefully to ensure that no dirt falls into the tank Make sure that the fuel is well mixed by shaking the container before fueling 000Book 5 ENG indb 6 2009 12 21 1 sal Fig 6 5 When you hear the engine attempts to start return choke lever to RUN position open C Then pull recoil starter briskly again NOTE If engine does not start repeat
5. Fuel filter Fig 15 engine oil into the cylinder through the spark plug hole and spin the Remove the fuel filter from the fuel tank and thoroughly wash it in engine over several times to distribute oil Cover the unit and store solvent After that push the filter into the tank completely itin a dry area Maintenance schedule Below you will find some general maintenance instructions For further information please contact your Hitachi dealer Daily maintenance Clean the exterior of the hedge trimmer Check the blade guard for damage or cracks Change the guard in case of impacts or cracks Check that the blade is sharp and without cracks Check that the blade nut is sufficiently tightened Make sure that the blade transport guard is undamaged and that it can be securely fitted Check that nuts and screws are sufficiently tightened 10000400 Fig 15 O OOO OO eekly maintenance Check the starter especially cord and return spring Clean the exterior of the spark plug Remove it and check the electrode gap Adjust it to 0 6 mm or change the spark plug Clean the cooling fins on the cylinder and check that the air intake at the starter is not clogged Check gear case is filled with grease Clean the air filter NOTE If the filter is hard due to dust and dirt replace it Cleaning the cylinder fins Fig 16 When leaves get caught between cylinder fins 8 the engine may overheat resulting in lower output
6. not covered in this manual take care and use common sense Contact your Hitachi dealer if you need assistance Pay special attention to statements preceded by the following words N WARNING Indicates a strong possibility of severe personal injury or loss of life if instructions are not followed CAUTION Indicates a possibility of personal injury or equipment damage if instructions are not followed NOTE Helpful information for correct function and use CAUTION Do not disassemble the recoil starter you may get a possibility of personal injury with recoil spring 2009 12 21 17 35 3 SPECIFICATIONS CH66EB3 ST CH55EB3 ST CH50EA3 ST CH62EA3 ST CH78EC3 ST Engine Size ml Spark Plug NGK BPMR 6A NGK BPMR 6A Fuel Tank Capacity I CH55EB3 ST CH66EB3 ST ST CH62EA3 ST Dry Weight kg 5 ST Overall cutter length CH66EBS ST mm CH55EB3 ST CH62EA3 ST 0 Blade type G Sound pressure level CH66EBS ST i LpA dB A CH55EB3 ST ISO 10517 CH50EA3 ST CH62EA3 ST Sound power level ISO 10517 2000 14 EC ISO 10517 2000 14 EC Lw measured dB A CH66EB3 ST 100 CH55EB3 ST 103 101 102 ST 107 CH62EA3 ST 108 LwA dB Vibration level m s ISO 10517 Front handle CH66EBS ST CH55EB3 ST CH50EA3 ST CH62EA3 ST Rear handle CH66EB
7. procedures from 2 to 4 6 After starting engine allow the engine about 2 3 minutes to warm up before subjecting it to any load Cutting When cutting operate engine at full throttle as this maintains proper cutter speed When trimming top of hedge hold trimmer so blades are between 15 and 30 degrees from a horizontal position and swing trimmer in an arc toward edge of hedge to sweep cuttings off When trimming sides of hedge hold blade vertically and swing unit inanarc NOTE O Multi position twist handle Fig 7 The rear control handle turns 90 degrees to provide comfortable use while accommodating a variety of cutting angles The handle allows for five different locking positions Before attempting to adjust rear handle make sure the machine is at idle or engine is shut off O The machine will automatically shut off if the throttle lever is pressed while the handle is NOT secured in one of the five preset positions Never attempt to operate the machine unless the rear handle is properly locked in place To rotate the handle push the lock lever 6 allowing the handle to turn Press the lock lever 6 to release the lock and allow the handle to turn Rotate the handle to the desired 0 45 or 90 locking position and press the release lever 7 to lock the handle in place D LOCK E UNLOCK OOOBook_CH50EA3_ENG indb 7 Stopping Fig 8 Decrease engine speed and push ignition switch to stop position F
8. 2 21 m WHAT IS WHAT Since this manual covers several models there may be some 5 difference between these illustrations and your unit Use the instructions that apply to your unit Recoil starter Fueltank Throttle trigger lookout Throttle trigger Front handle Rear handle Spark plug Hand guard 6 Cutting blade 10 Air cleaner 11 Ignition switch 12 Blunt guard 13 Gear case 14 Choke lever 15 Lock lever 16 Release lever 17 Priming pump 18 Blade cover 19 Combi box spanner 20 Handling instructions DONOThON 55 ST CH66EB3 ST 5 ST 62 ST CH78EC3 ST 000Book CH50EA3 ENG indb 3 2009 12 21 1 sal WARNINGS AND SAFETY INSTRUCTIONS Operator safety O Always wear a safety face shield or goggles O Always wear heavy long pants boots and gloves Do not wear loose clothing jewelry short pants sandals or go barefoot Secure hair so it is above shoulder length Do not operate this tool when you are tired ill or under the influence of alcohol drugs or medication Never let a child or inexperienced person operate the machine Wear hearing protection Never start or run the engine inside a closed room or building Breathing exhaust fumes can kill Keep handles free of oil and fuel Keep hands away from cutting equipment Do not grab or hold the unit by the cutting equipment When the unit is turned off make sure the cutt
9. 3 ST CH55EB3 ST CH50EA3 ST CH62EA3 ST NOTE Eguivalent noise level vibration level are calculated as the time weighted energy total for noise vibration levels under various working conditions with the following time distribution ISO 10517 1 5 idle 4 5 racing 2000 14 EC only racing All data subject to change without notice 000Book 5 ENG indb 5 2009 12 21 1 OPERATING PROCEDURES Starting CAUTION Fuel Fig 1 Before starting make sure the cutting attachment does not touch anything 1 Setignition switch 2 to ON position A Fig 3 Push priming bulb 4 several times so that fuel flows through the bulb or return pipe If so equipped Fig 4 WARNING The hedge trimmer is equipped with a two stroke engine Always run the engine on fuel mixed with oil Provide good ventilation when fueling or handling fuel Fuel O Always use branded 89 octane unleaded gasoline O Use genuine two cycle oil or use a mix between 25 1 to 50 1 please consult the oil bottle for the ratio or Hitachi dealer O If genuine oil is not available use an anti oxidant added quality oil expressly labeled for air cooled 2 cycle engine use JASO FC GRADE OIL or ISO EGC GRADE Do not use BIA or TCW 2 stroke water cooling type mixed oil Never use multi grade oil 10W 30 or waste oil Always mix fuel and oil in a separate clean container ERS
10. Book_CH50EA3_ENG ndb 14 2009 12 21 1 000Book CH5OFA3 ENG indb 15 2009 12 21 al Hitachi Koki Co Ltd Shinagawa Intercity Tower A 15 1 Konan 2 chome Minato ku Tokyo Japan 912 Code No E99004911 G Printed in China 000Book_CH50EA3_ENG indb 16 lt 2009 12 21 1
11. To avoid this always keep cylinder fins and fan case clean Every 100 operating hours or once a year more often if conditions require clean fins and external surfaces of engine of dust dirt and hly maintenance oil deposits which can contribute to improper cooling ont Rinse the fuel tank with gasoline ean the exterior of the carburetor and the space around it ean the fan and the space around it 00 OO O Fig 16 Cleaning the muffler Fig 17 Remove the muffler and spark arrestor if so equipped and clean out any excess carbon from the exhaust port or muffler inlet every 100 hours of operation hs b Fig 17 OOOBook_CH50EA3_ENG indb 9 2009 12 21 17 35 3 9 e e Lu I O gt n all A JS i x 2 4 e a V 10 000Book_CH50EA3_ENG indb 10 2009 12 21 1 51 CH55EB3 ST 000Book CH5OFA3 ENG indb 11 2009 12 21 al ST 000Book_CH50EA3_ENG indb 12 2009 12 21 1 m CH62EA3 ST 000Book 5 ENG indb 13 2009 12 21 1 SI i Ne 000
12. in a tree or from any unstable support When relocating to a new work area be sure to shut off the machine and ensure that all cutting attachments are stopped Never place the machine on the ground when running Always carry a first aid kit when operating any power equipment Never start or run the engine inside a closed room or building and or near the inflammable liquid Breathing exhaust fumes can kill 00 0 0 OO Maintenance safety O Maintain the unit machine according to procedures Disconnect the spark plug before performing maintenance except for carburetor adjustments Keep others away when making carburetor adjustments Use only genuine Hitachi replacement parts as recommended by the manufacturer recommended 00 0 Transport and storage O Carry the unit machine by hand with the engine stopped and the muffler away from your body O Allow the engine to cool empty the fuel tank and secure the unit machine before storing or transporting in a vehicle O Empty the fuel tank before storing the unit machine It is recommended that the fuel be emptied after each use If fuel is left in the tank store so fuel will not leak Store unit machine out of the reach of children Clean and maintenance the unit carefully and store it in a dry place Make sure engine switch is off when transporting or storing When transporting in a vehicle or storage cover blade with blade cover OO OO If situations occur which are
13. ing attachment has stopped before the unit is set down When operation is prolonged take a break from time to time so that you may avoid possible Hand Arm Vibration Syndrome HAVS which is caused by vibration N WARNING O Antivibration systems do not guarantee that you will not sustain Hand Arm Vibration Syndrome or carpal tunnel syndrome Therefore continual and regular users should monitor closely the condition of their hands and fingers If any symptoms of the above appear seek medical advice immediately O If you are using any medical electric electronic devices such as a pacemaker consult your physician as well as the device manufacturer prior to operating any power equipment O OOOO OOO O Unit machine safety O Inspect the entire unit machine before each use Replace damaged parts Check for fuel leaks and make sure all fasteners are in place and securely tightened Replace parts that are cracked chipped or damaged in any way before using the unit machine Make sure the safety guard is properly attached Keep others away when making carburetor adjustments Use only accessories as recommended for this unit machine by the manufacturer N WARNING Never modify the unit machine in any way Do not use your unit machine for any job except that for which it is intended Fuel safety O Mix and pour fuel outdoors and where there are no sparks or flames Use a container approved for fuel O Do not smo
14. is machine was originally equipped with resistor spark plug use the same type of spark plug for replacement Cutter blade Fig 12 13 The blades are installed to the cutter guide with the four or five bolts Those bolts are tightened with a clearance so that the cutters can move smoothly 000Book CH50EA3 ENG indb 8 When clearance is too small The cutters do not move properly and the sliding surfaces may seize When clearance is too large The cutters are poor in sharpness To adjust the cutter clearance 1 Loosenthe cutter fixing nuts 2 Fully tighten the cutter fixing bolts and then loosen them approx 1 2 turn 3 With the bolts set at that position tighten the cutter fixing nuts Be sure to replace cutter guide fixing bolts when they are loosened worn or damaged Also be sure to replace damaged cutter blade NOTE Properly lubricate the cutter sliding surfaces with machine oil Gear case Fig 14 Apply a good quality lithium based grease through the grease fitting until a small amount comes out between the cutter blades and the gear case Fig 14 2009 12 21 17 35 3 NOTE For long term storage Lubrication should be applied at 20 hour intervals and more Drain all fuel from the fuel tank Start and let engine run until it stops frequently with heavy use Repair any damage which has resulted from use Clean the unit with a clean rag or high pressure air hose Put a few drops of two cycle
15. ke or allow smoking near fuel or the unit machine or while using the unit machine O Wipe up all fuel spills before starting engine O Move atleast 3 m away from fueling site before starting engine O Stop engine before removing fuel cap O Empty the fuel tank before storing the unit machine It is recommended that the fuel be emptied after each use If fuel is left in the tank store so fuel will not leak Store unit machine and fuel in area where fuel vapors cannot reach sparks or open flames from water heaters electric motors or switches furnaces etc N WARNING Fuel is easy to ignite or get explosion or inhale fumes so that pay special attention when handling or filling fuel Cutting safety O Donotcutany material other than plant hedge Inspect the area to be cut before each use Remove objects which can be thrown or become entangled O For respiratory protection wear an aerosol protection mask when cutting the grass after insecticide is scattered O Keep others including children animals bystanders and helpers outside the 15 m hazard zone Stop the engine immediately if you are approached Hold the unit machine firmly with both hands OOOBook_CH50EA3_ENG indb 4 Keep firm footing and balance Do over reach Keep all parts of your body away from the muffler and cutting attachment when the engine is running Keep cutting tool below shoulder level NEVER operate unit from a ladder while
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