Page 2 - Specifications
2 wARnInG! The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Introduction The Shindaiwa H4 series of hand-held power equipment is designed and built to deliver superior per formance and reli- ability wi...
Page 3 - Safety; Operating Precautions
3 This product conducts elec- tricity. Keep the product and/ or operator a minimum dis- tance of 33 feet (10 meters) away from electrical sources and power lines. Be aware of the danger of falling debris. 33 ft 10 M Always wear a hard hat to reduce the risk of head inju- ries during operation of thi...
Page 4 - Safety Equipment and Labels; blades whenever possible, and always wear gloves to protect hands
4 CAUTIOn! Always maintain the articu- ■ lated hedge trimmer according to this owner’s manual and fol- low the recommended scheduled maintenance. Never modify or disable any of the ■ hedge trimmer’s safety devices. Doing so may cause damage and lead to personal injuryAlways use genuine Shindaiwa ■ p...
Page 5 - Operator Safety; Do not alter this machine; Product Description
5 Operator Safety wARnInG! Do not alter this machine or any of its components! Product Description Using the illustration as a guide, familiarize your- self with the Shindaiwa AH254 articulated hedge trimmer and its various components. Under- standing your machine helps ensure top perfor- mance, lon...
Page 6 - An Emission Control Label; followed as listed in the Maintenance Section of this manual.
6 Specifications Specifications are subject to change without notice. Model AH254 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 6.3 kg/14 lbs. Unit Dimensions (LxWxH) 2360 x 225 x 235 mm ...
Page 7 - Assembly; Prior To Assembly; the index finger of your left hand,; Adjusting the Hedge Trimmer Cutter Assembly; Adjusting for Storage or Transportation
7 Assembly Before assembling, make sure you have all the components required for a complete unit: Unit assembly ■ Prior To Assembly Kit with this manual and tool kit for ■ routine maintenance.Cutter blade cover ■ Carefully inspect all components for damage. IMPORTAnT! The terms “left”, “left-hand”, ...
Page 8 - Throttle lever free play; Fuel Requirements; NOT; certified; Mixing Fuel; Examples of 50:1 mixing quantities
8 Cable Adjuster 4 - 6 mm Throttle lever free play Assembly (continued) The throttle lever free play should be approximately 4 - 6 mm. Make sure that the throttle lever operates smoothly with- out binding. If it becomes necessary to adjust the lever free play, follow the pro- cedures and illustratio...
Page 9 - Filling the fuel tank; Place the unit on a flat, level sur face.; Handling Fuel; DANGER; Fuel storage laws vary by locality. Contact; Mixing Instructions; Fill an approved fuel container with half of the required; containers to reduce fuel spillage.; After use; occur. Return unused fuel to an approved fuel storage
9 Filling the fuel tank Place the unit on a flat, level sur face. 1. Clear any dir t or other debris from 2. around the fuel filler cap. Remove the fuel cap, and fill the 3. tank with clean, fresh fuel.Reinstall the fuel filler cap and 4. tighten firmly.Wipe away any spilled fuel before 5. star ting...
Page 10 - Starting the Engine; WARNING; Never start the engine from the operating position.
10 Make sure the attachment is clear of obstructions! ...and pull recoil starter handle upward Hold the unit firmly... Press the primer bulb until fuel can 3. be seen flowing in the transparent retur n tube. IMPORTAnT! The primer system only pushes fuel through the carburetor. Repeatedly pressing th...
Page 11 - Do not pull the recoil starter to the; Starting A Flooded Engine; If the engine does not start
11 Open After engine starts, move choke to OPEN position CAUTIOn! Do not pull the recoil starter to the end of the rope travel. Pulling the recoil starter to the end of the rope travel can damage the starter. IMPORTAnT! If the engine fails to star t after several attempts with the choke in the close...
Page 12 - Checking Unit Condition; A cutting attachment shield; Operation; Preparations
12 NEVER operate the unit with protec- tive devices removed!Use only authorized Shindaiwa parts and accessories with your Shindaiwa hedge trimmer. Do not make modifications to this unit without written approval from Shindaiwa. ALWAYS make sure the cutting attach- ment is properly installed and firml...
Page 13 - Maintenance; Prior to each work day, per form the
13 Maintenance wARnInG! Before performing any mainte- nance, repair, or cleaning work on the unit, make sure the engine and cutting attachment are completely stopped. Disconnect the spark plug wire before performing service or maintenance. wARnInG! Non-standard accessories, cut- ting attachment, or ...
Page 14 - Gearcase lubrication
14 spark plug gap--all models Components of air filter Filter element Prefilter Loosen fasteners Remove the cover of the air filter Maintenance (continued) 10-Hour maintenance (more frequently in dusty condi- tions) Remove the air filter cover by loosen- 1. ing the cover screw(s) and lifting. Remove...
Page 15 - Ever y 50 hours of operation
15 Lubricate cutter assembly and gearcase Gearcase grease fitting B Fuel filter maintenance Fuel filter element Hooked wire Outer tube Gearcase Gearcase Clamp bolt Index bolt Remove the outer tube from the gearcase Gearcase lubrication Maintenance (continued) CAUTION!Do not remove the D-shaped shim ...
Page 16 - Valve Adjustment
16 Maintenance (continued) 135-Hour Maintenance Combustion chamber should be ■ decarbonized, and the valve clear- ance should be adjusted. It is highly recommended that this is done by a Shindaiwa-trained ser vice technician. Replace the spark plug annually: ■ Use only the type recommended in the ”S...
Page 17 - Muffler and spark arrester maintenance; damaged or missing muffler or spark; Cutter blade adjustment
17 Locknut Washer (should turn freely) Maintenance (continued) Muffler and spark arrester maintenance Engine Cover Screws Engine Cover Muffler Muffler Gasket Muffler Bolts Spark Arrester Screen Spark Arrester Cover Cover Screws With a 3 mm hex wrench remove the 1. 4 engine cover screws and the engin...
Page 18 - Carburetor Adjustment; High Altitude Operation; Adjusting Engine Idle; Idle Speed Adjustment; serviced in the field.; Long Term Storage; Gasoline stored in the carbure-; nOTE
18 Carburetor Adjustment Engine Break-In New engines must be operated a minimum duration of two tanks of fuel break-in before carburetor adjustments can be made. During the break-in period your engine performance will increase and exhaust emissions will stabilize. Idle speed can be adjusted as requi...
Page 19 - Troubleshooting Guide; ENGINE DOES NOT START OR HARD TO START
19 Troubleshooting Guide Vaporlock. Valve adjustment. Engine hot/heat soaked. Low fuel quality. Valve clearance too tight. Valve clearance too loose. Let cool completely and restart. Refill with fresh, clean unleaded gasoline with a pump octane of 89 or higher mixed with an air cooled engine oil tha...
Page 20 - What To Check; LOW POWER OUTPUT
20 Is the engine overheating? Engine is rough at all speeds. May also have black smoke and/or unburned fuel at the exhaust. Operator is over working the unit. Carburetor mixture is too lean. Improper fuel ratio. Fan, fan cover, cylinder fins dirty or damaged. Carbon deposits on the piston or in the ...
Page 21 - ADDITIONAL PROBLEMS; Symptom; Engine stops abruptly.; Top of engine is getting
21 ADDITIONAL PROBLEMS Poor acceleration. Clogged air filter. Clogged fuel filter. Lean fuel/air mixture. Idle speed set too low. Ignition switch turned off. Fuel tank empty. Water in the fuel. Clogged fuel filter. Shorted spark plug or loose terminal. Ignition failure. Piston seizure. Ground (stop)...
Page 25 - nOTES
Page 28 - Yamabiko Corporation; Servicing Information; Shindaiwa Dealer. When you do need to buy parts; always; have the Model Number, Type and Serial Number of the; Service; provides a direct link if we find it necessary to contact you.; Additional or Replacement Manuals; Replacement Operator and Parts Catalogs; are available from your Shindaiwa dealer or at WWW.SHINDAIWA.; Copyright© 2010 By Echo, Incorporated
ECHO Incorporated. 400 Oakwood Road Lake Zurich, IL 60047-1564 U.S.A. Telephone: 1-877-986-7783 Fax: 1-847-540-8416 www.shindaiwa.com Yamabiko Corporation 7-2 Suehirocho 1-Chome, Ohme, Tokyo, 198-8760, Japan Phone: 81-428-32-6118 Fax: 81-428-32-6145 T12711001001/T12711999999 T12612001001/T1261299999...