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                        SHInDAIwA O wnER’S/OPERATOR'S MAnUAL
AHS254
ARTICULATED HEDGE TRIMMER
wARnInG!
Always wear eye and ear protection when operat-
ing this machine! To minimize the risk of injury to 
yourself and others, read this manual and familiarize 
yourself with its contents.
X7502872100
04/10                                                                                                                                                                                                                            
                    
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                        Introduction IMPORTAnT! wARnInG! The Shindaiwa H4 series of hand-held  The information contained in these  power equipment  is designed and built The engine exhaust from  to deliver superior performance and reli- instructions describes units available at  this product contains chemicals  ability without compromise to quality,  the time of publication.  known to the State of California  comfort, safety or durability.  Shindaiwa  to cause cancer, birth defects or  engines represent the leading edg
                    
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                        Keep bystanders at least Be aware of the danger of  The blades / cutting attach- falling debris. 50 feet (15 meters) away  ments are SHARP! Handle  from the operating trimmer  with care. to reduce the risk of being  cut by the cutting blades or  struck by falling objects or  thrown debris. Safety An articulated hedge trimmer has the  DAnGER! AR w nInG! potential to cause serious personal  THE ARTICULATED  Do not make unauthor- injury to the operator or bystanders  HEDGE TRIMMER IS NOT INSULATED 
                    
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                        Safety (continued) WARNING! Hedge Clipper blades are very sharp.  Touching them may lead to severe personal injury.  Avoid touching  blades whenever possible, and always wear gloves to protect hands CAUTIOn! ■ Do not make unauthorized modi- ■ Always stop the engine and allow  fications to the articulated hedge it to cool before refueling. Avoid  ■ Always maintain the articu- trimmer or its components. overfilling and wipe off any fuel  lated hedge trimmer according  that may have spilled. ■ Keep
                    
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                        Operator Safety Always wear a hard hat  This machine is designed  ALWAYS clear your work area  to reduce the risk of head  for trimming hedges. Do  of trash or hidden debris that  injuries during operation of  not use this machine for  could be thrown back at you or  this machine. other purposes. toward a bystander. Always wear eye and hearing protection.  ALWAYS protect  Shindaiwa recommends wearing a  yourself from hazards  face shield as additional face and eye  such as thorny brush  protecti
                    
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                        Specifications Model AHS254 Engine Type 4-cycle, vertical cylinder, air cooled Engine Bore x Stroke 34 x 27 mm/1.3  x 1.1 in. Engine Displacement 24.5cc/1.5 cu. in. Unit Weight, Less Fuel 6.2 kg/13.6 lbs. Unit Dimensions (LxWxH) 1670 x 197 x 250 mm / 65.8 x 7.8 x 9.9 in. Fuel Tank Capacity 590 ml/20 .3 oz. Fuel/oil ratio 50:1 with *ISO-L-EGD or JASO FD class engine oil Carburetor Diaphragm type Ignition Fully electronic, program controlled Spark Plug NGK CMR5H Electrode Gap 0.6  mm/ .024  in. To
                    
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                        Assembly Prior To Assembly IMPORTAnT! ■ This manual and tool kit for routine  Before assembling, make sure you  maintenance. The terms “left”, “left-hand”, and  have all the components required for a  “LH”; “right”, “right-hand”, and “RH”;  ■ Cutter blade cover complete unit: “front” and “rear” refer to directions as  Carefully inspect all components for  ■ Unit assembly viewed by the operator during normal  damage. operation.  Handle This unit comes with the handle  Socket-head   Capscrews inst
                    
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                        Assembly (continued) 1. Position the hedge trimmer on a flat,   level surface. 2. With your right hand, grasp the outer  IMPORTAnT! Latch release tube near the handle. With your left  The latch lock provides an interlock to  hand, grip the adjustment lever on  help prevent inadvertent depression of  the cutter assembly.  the latch release. 3. With the index finger of your left  5. Release the latch lock and the latch  hand, press the latch lock. With your  release. Make sure the latch lock  left
                    
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                        Assembly (continued) Throttle lever free play The throttle lever free play should  be approximately 4 - 6 mm.  Make  sure that the throttle lever oper- ates smoothly without binding.  If it  becomes necessary to adjust the lever  free play, follow the procedures and  illustrations that follow.  1. Loosen the air cleaner cover  knob(s) and remove the air cleaner  4 - 6 mm Cable  cover.  Adjuster Throttle lever free play 2. Turn the cable adjuster in or out as  required to obtain proper free play 
                    
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                        Handling Fuel       DANGER Fuel is VERY flammable. Use extreme care when mixing, storing or handling or serious personal injury may result. • Use an approved fuel container.  • DO NOT smoke near fuel. • DO NOT allow flames or sparks near fuel. • Fuel tanks/cans may be under pressure. Always loosen fuel caps slowly allowing pressure to equalize. • NEVER refuel a unit when the engine is HOT or RUNNING! • DO NOT fill fuel tanks indoors. ALWAYS fill fuel tanks outdoors over bare ground. • DO NOT ove
                    
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                        Starting the Engine IMPORTAnT! Engine ignition is controlled by a two position switch mounted on the throttle housing labeled, “I” for ON or START and  “O” for OFF or  STOP.     WARNING The attachment will operate immediately when the engine starts and could result in loss of control and possible serious injury.  Keep movable parts of the attachment and away from objects that could become entangled or thrown. NOTE: The blade cover is used for transportation and storage. Remove blade cover before
                    
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                        Hold  IMPORTAnT! Close  the unit  choke firmly... The primer system only pushes fuel  through the carburetor. Repeatedly  pressing the primer bulb will not flood  the engine with fuel. 4. Set the choke lever to the CLOSED  position if engine is cold. 5. While holding the outer tube firmly  with left hand. Use your other hand  to slowly pull the recoil starter han- Make sure the  ...and pull recoil  attachment is clear  starter handle  dle until resistance is felt, then pull  of obstructions! Set
                    
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                        Starting the Engine (continued) Starting a flooded engine AR w nInG! Burn danger from hot engine! Allow engine to cool before removing  cylinder cover. 1. Slide the ignition switch to the “I” (ON) position. 2. Open the choke, put the throttle lever in the full throttle position, then clear excess fuel from the combustion chamber by  cranking the engine several times. 3. If the engine still fails to start or fire, refer to the troubleshooting flow chart at the end of this manual. Stopping the Eng
                    
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                        Operation Before trimming: ■ Put on the strap, if so equipped. This machine is designed especially for  trimming hedges. ■ Rest when you feel fatigued. ■ Wear suitable protective clothing and  Never use this machine for any other equipment. See the Safty section for  ■ Never stand directly underneath the  information. purposes. Never try to cut stones, met- branch you are cutting. Be aware of  als, plastics or any other hard objects. falling branches. Note that a branch  ■ Choose the best workin
                    
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                        Maintenance (continued) Fasteners Air Filter nOTE: Make sure nuts, bolts, and screws The H4 engine that powers your  Using non-standard replacement  (except carburetor adjusting screws) Shindaiwa model is a hybrid 4-stroke  parts could invalidate your Shindaiwa  are tight. engine. As a hybrid, the engine is lubri- warranty. cated by oil mixed with the gasoline  Muffler and air from the carburetor that moves  This unit must never be operated with  through and around the internal parts of  a fault
                    
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                        Maintenance (continued) 10-Hour maintenance (more frequently in dusty conditions) 1. Remove the air filter cover by loosen- Loosen  ing the cover screw(s) and lifting. fasteners 2. Remove and inspect the pre-filter.  If the pre-filter is torn or otherwise  damaged, replace it with a new one. Prefilter 3. Clean the pre-filter with soap and  water. Let dry before reinstalling.  4. Inspect the air filter element. If the  element is damaged or distorted,  Filter element replace it with a new one. 5.
                    
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                        Maintenance (continued) 50-hour maintenance Every 50 hours of operation; more  frequently in dusty conditions: Remove and clean the cylinder cover  and clean dirt and debris from the cyl- inder cooling fins. Hooked wire Remove and replace the fuel filter  element. ■ Use a hooked wire to extract the fuel  filter from inside the fuel tank. Inspect  the fuel filter element. If it shows signs Fuel filter element of contamination, replace with a genu- Fuel filter maintenance ine Shindaiwa replacement
                    
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                        Maintenance (continued) 135-Hour Maintenance ■ Replace the spark plug annually: Use  ■ Combustion chamber should be  only the type recommended in the  decarbonized, and the valve clear- ”Specifications” section or an equiva- ance should be adjusted. It is highly  lent  resistor type spark plug of the  recommended that this is done  correct heat range. Set spark plug  by a Shindaiwa-trained service  electrode gap to 0.6  mm. technician. Valve Adjustment 1. Remove cylinder cover, rocker arm  cover
                    
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                        Maintenance (continued) Muffler and spark arrester maintenance If the engine becomes sluggish and low  on power, check and clean the spark  arrester screen. AR w nInG! Engine Cover Never operate the unit with a  Engine  damaged or missing muffler or  Cover  Screws spark arrester! Operating with a miss- ing or damaged spark arrester is a fire  hazard and could also damage your  hearing. 1. With a 3 mm hex wrench remove the  Muffler 4 engine cover screws and the engine  Muffler Gasket  cover. 2. W
                    
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                        Maintenance (continued) Adjusting Engine Idle The engine must return to idle speed Idle Speed Adjustment Idle whenever the throttle lever is released.  1. Place the unit on the ground, then  Ajust- Idle speed is adjustable, and must be set  start the engine, and then allow it to  ment low enough to permit the engine clutch Screw idle 2-3 minutes until warm. to disengage the cutting attachment. 2. If the attachment moves when the  engine is at idle, reduce the idle  speed by turning the idle adju