Operator’s Manual DH235 Hedge Trimmer The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. Read and understand all provided literature before use. Failure to do so could result in serious injury. Note: This product complies with CAN ICES-2/NMB-2.
TABLE OF CONTENTS DH235 TABLE OF CONTENTS Introduction ............................................................................................................. 3 Servicing Information .................................................................................. 4 Parts/Serial Number............................................................................. 4 Service ................................................................................................. 4 Consumer Product Support ....
DH235 INTRODUCTION INTRODUCTION Specifications, descriptions and illustrative material in this literature are as accurate as known at the time of publication, but are subject to change without notice. Illustrations may include optional equipment and accessories, and may not include all standard equipment. Read and understand all provided literature. Literature contains specifications and information for safety, operation, maintenance, storage, and assembly specific to this product.
SERVICING INFORMATION DH235 Service Service of this product during the warranty period must be performed by an Authorized SHINDAIWA Service Dealer. For the name and address of the Authorized SHINDAIWA Service Dealer nearest you, ask your retailer or call: 1-877-986-7783. Dealer information is also available on WWW.SHINDAIWA-USA.COM. When presenting your unit for Warranty service/repairs, proof of purchase is required.
DH235 SAFETY SAFETY Manual Safety Symbols and Important Information Throughout this manual and on the product itself, you will find safety alerts and helpful, informational messages preceded by symbols or key words. The following is an explanation of those symbols and key words and what they mean to you. The safety alert symbol accompanied by the word “DANGER” calls attention to an act or condition which WILL lead to serious personal injury or death if not avoided.
SAFETY DH235 International Symbols Symbol Description Symbol Read and understand Owners Manual Fuel and oil mixture Wear eye, ear and head protection Finger severing Emergency Stop Hot Surface Wear hand and foot protection. Use two handed DO NOT smoke near fuel Choke Control “COLD START” Position (Choke Closed) Ignition ON / OFF Do not operate without guards in place. Choke Control “RUN” Position (Choke Open) L Carburetor Adjustment - Low speed mixture Safety/Alert Avoid all power lines.
DH235 SAFETY Symbol Description Symbol Description Plan retreat path from falling objects Primer Bulb DO NOT allow flames or sparks near fuel Wear slip resistant footwear Keep bystanders at least 4.5 meters (15 ft.) away. Note: Not all symbols will appear on your unit. Personal Condition and Safety Equipment Cancer and Reproductive Harm www.P65Warnings.ca.gov The muffler or catalytic muffler and surrounding cover may become extremely hot.
SAFETY DH235 Users of this product risk injury to themselves and others if the unit is used improperly and/or safety precautions are not followed. Proper clothing and safety gear must be worn when operating unit. Physical Condition Your judgment and physical dexterity may not be good: • If you are tired or sick • If you are taking medication • If you have taken alcohol or drugs Operate unit only if you are physically and mentally well. Eye Protection ◆ ◆ Eye protection that meets ANSI Z87.
DH235 SAFETY Proper Clothing Wear snug-fitting, durable clothing: • Pants should have long legs, shirts should have long sleeves. • DO NOT WEAR SHORTS. • DO NOT WEAR TIES, SCARVES, JEWELRY, or clothing with loose or hanging items that could become entangled in moving parts or surrounding growth. • Keep clothing buttoned or zipped, and keep shirt tails tucked in. • Wear sturdy work shoes with nonskid rubber soles. • DO NOT WEAR OPEN TOED SHOES. • DO NOT OPERATE UNIT WITH BARE FEET.
SAFETY DH235 It is believed that a condition called Raynaud’s Phenomenon, which affects the fingers of certain individuals, may be brought about by exposure to vibration and cold. Exposure to vibration and cold may cause tingling and burning sensations, followed by loss of color and numbness in the fingers. The following precautions are strongly recommended, because the minimum exposure, which might trigger the ailment, is unknown.
DH235 SAFETY • Immediately stop using all power equipment and consult a doctor if you feel tingling, numbness, or pain in the fingers, hands, wrists, or arms. The sooner RSI/CTS is diagnosed, the more likely permanent nerve and muscle damage can be prevented. All over head electrical conductors and communications wires can have electricity flow with high voltages. This unit is not insulated against electrical current. Never touch wires directly or indirectly, otherwise serious injury or death can result.
SAFETY DH235 Never perform blade maintenance procedures while engine is running. Equipment Use only ECHO attachments. Serious injury may result from the use of a non-approved attachment combination. ECHO, INC. will not be responsible for the failure of cutting devices, attachments or accessories which have not been tested and approved by ECHO, INC. Read and comply with all safety instructions listed in this manual and safety manual. ◆ Check unit for loose or missing nuts, bolts, and screws.
DH235 EMISSION CONTROL EMISSION CONTROL (EXHAUST & EVAPORATIVE) CARB And EPA Emissions Control Information The emission control system for the engine is EM (engine modification) and, if the second to last character of the Engine Family on the Emission Control Information label (sample below) is “B”, “C”, “K”, or “T”, the emission control system is EM and TWC (3way catalyst). The fuel tank/fuel line emission control system is EVAP (evaporative emissions).
DESCRIPTION DH235 DESCRIPTION Locatethe safety decal(s) on your unit. Make sure the decal(s) is legible and that you understand and follow the instructions on it. If a decal cannot be read, a new one can be ordered from your Shindaiwa dealer. Safety label is for example only. Your label my appear slightly different. 2 6 1 8 3 7 5 4 13 12 9 10 11 14 15 16 4.
DH235 1. Purge Bulb 2. Spark Plug 3. Choke 4. Stop Switch 5. Support Handle for Left Hand 6. Blade Cover 7. Guide Bar 8. Cutter 9. Fuel Tank Cap 10. Fuel Tank CONTENTS 11. Gear Case 12. Air Filter 13. Blade Guard 14. Recoil Starter Handle 15. Throttle Trigger Lock Out 16.
ASSEMBLY DH235 ASSEMBLY This model is factory assembled. OPERATION Moving parts can amputate fingers or cause severe injuries. Keep hands, clothing and loose objects away from all openings. Always stop engine, disconnect spark plug, and make sure all moving parts have come to a complete stop before removing obstructions, clearing debris, or servicing unit. Engine exhaust IS HOT, and contains Carbon Monoxide (CO), a poison gas. Breathing CO can cause unconsciousness, serious injury, or death.
DH235 OPERATION Fuel Diesel fuels and alternative fuels, such as E15 (15% ethanol), E85 (85% ethanol) or any fuels not meeting Shindaiwa requirements are NOT approved for use in Shindaiwa 2-stroke or Hybrid 4-stroke gasoline engines. Use of diesel or alternative fuels may cause performance problems, loss of power, overheating, fuel vapor lock, and unintended machine operation, including, but not limited to, improper clutch engagement.
OPERATION ◆ ◆ ◆ DH235 WEAR SAFETY GLASSES when mixing or handling. AVOID repeated or prolonged skin contact. AVOID inhaling oil mists or vapors. Shindaiwa branded 2-stroke oils may be mixed at 50:1 ratio for application in all Shindaiwa engines sold in the past, regardless of ratio specified in those manuals. Handling Fuel 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.
DH235 Mixing Instructions 1. Fill an approved fuel container with half of the required amount of gasoline. 2. Add the proper amount of engine oil to gasoline. 3. Close container and shake to mix oil with gasoline. 4. Add remaining gasoline, close fuel container, and remix. OPERATION Fuel to Oil Mix – 50:1 Ratio US Metric Gas Oil Gas Oil gal. fl. oz. L cc 1 2.6 5 100 2 5.2 10 200 5 13 25 500 Spilled fuel is a leading cause of hydrocarbon emissions.
OPERATION DH235 Starting Cold Engine Hedge Trimmer blades are very sharp. Touching them may lead to severe personal injury. Avoid touching blades whenever possible, and always wear gloves to protect hands. Note: The blade cover is used for transportation and storage. Remove blade cover before using the unit. 1. Stop Switch Move stop switch (A) away from the STOP position. 2. Choke Move choke (B) to COLD START ( ) (closed) position. 3.
DH235 5. OPERATION Choke After engine fires (or 2-3 pulls), move choke (B) to the RUN ( ) (open) position. Restart engine if necessary and allow unit to warm up at idle for several minutes. C C B Note: If engine does not start with choke in “RUN” position after 5 pulls, repeat instructions 2 - 5. The blades must not move at idle, otherwise serious personal injury may result. Periodic carburetor adjustment may be necessary to assure blades do not move at idle.
OPERATION 1. Stop Switch Move stop switch (A) away from the STOP position. 2. DH235 A Purge Bulb Pump purge bulb (C) until fuel is visible and flows freely in the clear fuel tank return line. Pump bulb an additional 4 or 5 times. 3. C C B Recoil Starter Place the unit on a flat, clear area. Grip the support handle securely with one hand, and pull the recoil starter handle (D) until engine starts. D Note: If engine does not start after 2-3 pulls, use Cold Start Procedure. Stopping Engine 1.
DH235 2. Stop Switch Move stop switch (A) to STOP position. OPERATION A If engine does not stop when stop switch is moved to STOP position, close choke - COLD START position - to stall engine. Have your dealer repair stop switch before using unit again. Rotating operation This model is equipped with a roating throttle handle that can be turned 90° to either side of vertical operating position to help reduce operator fatigue and improve precision trimming.
MAINTENANCE DH235 Hedge Trimming Hedge Trimmer blades are very sharp. Touching them may lead to severe personal injury. Avoid touching blades whenever possible, and always wear gloves to protect hands. 1. Always grip support handle with right hand, and throttle handle with left hand. 2. Hold trimmer firmly and squeeze throttle trigger to accelerate engine. 3. Tilt trimmer so cutting teeth are angled slightly toward the hedge or shrub and proceed to cut.
DH235 MAINTENANCE Operating a poorly maintained unit can result in serious injuries to operator or bystanders. Always follow all maintenance instructions as written, otherwise serious personal injury may result. Your unit is designed to provide many hours of trouble free service. Regular scheduled maintenance will help your unit achieve that goal. If you are unsure or are not equipped with the necessary tools, we recommend that you take your unit to a Servicing Dealer for maintenance.
MAINTENANCE DH235 Maintenance Intervals COMPONENT/SYSTEM MAINTENANCE PROCEDURE REQUIRED SKILL LEVEL Daily or Before Use Air Filter Choke Shutter Inspect/Clean * 1 3 Fuel System Inspect Cooling System Inspect/Clean Recoil Starter Rope Inspect/Clean * Screws/Nuts/Bolts Inspect/Tighten/Replace * Blades Inspect/Clean 2 1 2 Every Refuel Fuel System Inspect 3 1 Three Months Air Filter Fuel Filter Fuel Cap Gasket Spark Plug Muffler Spark Arrestor Cylinder Exhaust Port Gear Housing Replace
DH235 MAINTENANCE Air Filter Level 1. Parts Required: AIR FILTER 1. Close choke (A)(COLD START [ ] position). This prevents dirt from entering the carburetor throat when the air filter is removed. Brush accumulated dirt from air cleaner area. 2. Remove air filter cover. Brush dirt from inside cover. 3. Replace filter if it is damaged, fuel soaked, very dirty, or the rubber sealing edges are deformed. • Lightly brush debris from filter.
MAINTENANCE DH235 Note: Federal EPA regulations require all model year 2012 and later gasoline powered engines produced for sale in the United States to be equipped with a special low permeation fuel supply hose between the carburetor and fuel tank. When servicing model year 2012 and later equipment, only fuel supply hoses certified by EPA can be used to replace the original equipment supply hose. Fines up to $37,500 may be enforced for using an un-certified replacement part. Spark Plug Level 2.
DH235 MAINTENANCE Removal of cooling passage blockages or cleaning of cooling fins is considered “Normal Maintenance.” Any failure attributed to lack of maintenance is not warranted. 1. Remove spark plug lead. 2. Remove muffler cover. 3. Remove engine cover (A). 4. Use brush to remove dirt from the cylinder fins. C A DO NOT use a metal scraper to remove dirt from the cylinder fins. 5. Assemble components in reverse order. Exhaust System Spark Arrestor Screen Level 2.
MAINTENANCE Parts Required: DH235 Spark Arrestor Screen, Gasket 1. Remove spark plug lead. 2. Remove muffler cover (B). 3. Place piston at Top Dead Center (TDC) to prevent carbon/dirt from entering cylinder. 4. Remove exhaust guide (C), gasket (D), and screen (E) from muffler body. 5. Clean carbon deposits from muffler components. Note: When cleaning carbon deposits, be careful not to damage the catalytic element inside muffler. B E D C 6.
DH235 3. MAINTENANCE Use a wood or plastic scraping tool to clean deposits from cylinder exhaust port. Never use a metal tool to scrape carbon from the exhaust port. Do not scratch the cylinder or piston when cleaning the exhaust port. Do not allow carbon particles to enter the cylinder. 4. Inspect heat shield, and replace if damaged. 5. Install heat shield and muffler. 6. Tighten muffler mounting bolts (or nuts) to 90-110 kgf•cm (80-95 in•lbf). 7. Install engine cover and attach spark plug lead.
MAINTENANCE DH235 High Altitude Operation This engine has been factory adjusted to maintain satisfactory starting, emission, and durability performance up to 1,100 feet above sea level (ASL) (96.0 kPa). To maintain proper engine operation above 1,100 feet ASL the carburetor may need to be adjusted by an authorized service dealer.
DH235 MAINTENANCE Lubrication Blades Level 1. Parts Required: Echo RedArmor™ Blade Cleaner & Lubricant, or 20W Engine Oil (blade lubrication), 50-50 mixture of kerosene and 20W oil (blade cleaning) Hedge Trimmer blades are very sharp. Touching them may lead to severe personal injury. Avoid touching blades whenever possible, and always wear gloves to protect hands. 1. Move stop switch to stop position. 2. Disconnect spark plug wire from spark plug. 3.
MAINTENANCE DH235 Gear Box Level 1. Parts Required: Lithium Based Grease. 1. Clean dirt from the grease fitting (A) and grommet (B). 2. Do not force grease. Too much pressure will force grease past seals and cause damage. Apply 1-2 pumps of grease every 20 hours of operation. 3. Remove the grommet next to the grease icon then add grease as illustrated. 4. Reinstall the grommet securely in the hole otherwise, it may become lost.
DH235 MAINTENANCE Blades Hedge trimmer blades are very sharp, touching them may lead to severe personal injury. Use long hex wrenches and sockets with extensions when tightening blade screws and blade lock nuts to keep hands at a safe distance from sharp blades. Blades should only be removed and reinstalled by an authorized servicing dealer, otherwise premature wear or internal damage may occur. Sharpening Level 2. If a power grinder is used DO NOT allow blade to over heat. 1.
MAINTENANCE DH235 Adjustment Level 2. Locking ability of hedge trimmer blade lock nuts will diminish each time they are removed. Replace if turning resistance is not felt when installing lock nuts. 1. Tighten blade screws securely. 2. Hold blade screws (A) to prevent turning, and tighten lock nuts (B).
DH235 TROUBLESHOOTING TROUBLESHOOTING ENGINE PROBLEM TROUBLESHOOTING CHART Problem Engine starts hard Check Status Cause Remedy Fuel at carburetor No fuel at carburetor Fuel strainer or fuel line obstructed Clean or replace No fuel at cylinder Carburetor See your dealer See your dealer or Engine does not start OPEN choke Fuel at cylinder Muffler wet with fuel Engine starts hard or Engine does not start or Engine does not accelerate properly Adjust carburetor See your dealer Turn switch
TROUBLESHOOTING DH235 ENGINE PROBLEM TROUBLESHOOTING CHART Problem Engine runs, but dies or Engine does not accelerate properly Engine does not crank Check Status Plug dirty Spark plug or worn Cause Remedy Normal wear Clean and adjust or replace Adjust Carburetor Improper adjustment Vibration Cooling system Cooling system dirty or plugged Extended operation in dirty or Clean dusty locations Spark arrestor screen Spark arrestor screen plugged Normal wear Replace Internal engine problem S
DH235 STORAGE STORAGE The muffler and surrounding cover become hot during operation. Always keep exhaust area clear of flammable debris during transportation or when storing, otherwise serious property damage or personal injury may result. Hedge Trimmer blades are very sharp. Touching them may lead to severe personal injury. Avoid touching blades whenever possible, and always wear gloves to protect hands.
SPECIFICATIONS DH235 8. Drain fuel tank completely. Press purge bulb 6-7 times to remove remaining fuel from carburetor then drain the tank again. Close choke, start and run the engine until it stops due to lack of fuel. 9. Allow engine to cool. Remove the spark plug lead from the spark plug. Remove the spark plug. Pour 7 cc (0.25 oz.) of fresh, clean, two-stroke engine oil into the cylinder through the spark plug hole. a. Place a clean cloth over the spark plug hole. b.
DH235 SPECIFICATIONS MODEL DH235 Fuel Tank Capacity 0.37 lit. (12.5 US fl. oz.) Starter System Automatic Recoil Starter Clutch Centrifugal Type Gear Case Ratio 4.6:1 Cutter Double Reciprocating Blade, Double Edge Length 624 mm (24.6 in.) Pitch 35mm (1.38 in.) Height 24mm (0.94 in.) Maximum Diameter Cut: Soft Material 25.4mm (1 in.) Woody Material 13mm (1/2 in.) Idle Speed 3,300 RPM Clutch Engagement Speed 4,700 RPM Wide Open Throttle Speed (W.O.T.
PRODUCT REGISTRATION DH235 PRODUCT REGISTRATION Thank you for choosing Shindaiwa Power Equipment Please go to http://www.shindaiwa-usa.com to register your new product on-line. It's FAST and EASY! NOTE: your information will never be sold or misused by ECHO, Inc. Registering your purchase enables us to contact you in the unlikely event of a service update or product recall, and verifies your ownership for warranty consideration.
DH235 X7712240300 © 07/2020 ECHO Incorporated PRODUCT REGISTRATION 43
S/N U45315001001 - U45315999999 ECHO INCORPORATED 400 Oakwood Road Lake Zurich, IL 60047 www.shindaiwa-usa.
