Honda Power Products UMK425T Owner's Manual
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Honda Power Products UMK425T Owner's Manual

Grass/weed trimmer
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GRASS/WEED TRIMMER
UMK425T
OWNER'S MANUAL
Read and understand this Owner's Manual before operating the grass/weed trimmer.

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  • Page 1 GRASS/WEED TRIMMER UMK425T OWNER'S MANUAL Read and understand this Owner’s Manual before operating the grass/weed trimmer.
  • Page 2 Thank you for purchasing a Honda grass/weed trimmer. This manual covers the operation and maintenance of the Honda GRASS/WEED TRIMMER UMK425T. Honda Motor Co., Ltd. reserves the right to make changes at any time without notice and without incurring any obligation.

  • Page 3: Table Of Contents

    CONTENTS 1. SAFETY INSTRUCTIONS............3 2. SAFETY LABEL LOCATIONS ..........14 3. COMPONENT IDENTIFICATION..........15 4. CONTROLS ................. 17 5. PRE-OPERATION CHECK............20 6. STARTING THE ENGINE............36 7. TRIMMING OPERATION ............40 8. STOPPING THE ENGINE ............44 9. MAINTENANCE ..............45 10.TRANSPORTING..............

  • Page 4: Safety Instructions

    1. SAFETY INSTRUCTIONS To ensure safe operation For your safety and safety of others, pay special attention to these precautions: • Honda grass/weed trimmer is designed to give safe and dependable service if operated according to instructions. Read and understand the Owner’s Manual before operating the grass/weed trimmer.
  • Page 5 To ensure safe operation Operator Responsibility • Never operate the grass/weed trimmer when tired, ill or under influence of alcohol or other drugs. • Any part from the machine is a potential source of danger if the machine is used in abnormal conditions or if the maintenance is not done correctly.
  • Page 6 To ensure safe operation Operator Responsibility • While operating the grass/weed trimmer, always wear following protective clothing and protective devices. – Protective clothing Wear adequate clothes with long sleeves and long pants.The clothes must fit your body and button up or zip up the clothes securely.
  • Page 7 To ensure safe operation Operator Responsibility * Safety boots Wear the safety boots with the non-slip sole and toe protector to protect your feet from the flying debris. Do not operate the equipment when barefoot or wearing open sandals. Wear the leg protectors as well. * Dust mask We recommend that you wear the dust mask if you suffer from the allergic rhinitis, e.g.
  • Page 8 To ensure safe operation Operator Responsibility • Do not operate the grass/weed trimmer with the grass deflector, labels, and other parts removed. Note that the grass deflector is provided for protection of the operator from the debris that are thrown from the wheeling cutting attachment.
  • Page 9 To ensure safe operation Operator Responsibility • Stop the engine with the engine switch to the OFF position in the following cases: – Before any operation around the cutting attachment. – Before checking, cleaning or working on the grass/weed trimmer. –...
  • Page 10 To ensure safe operation Operator Responsibility • Do not use the grass/weed trimmer with worn or damaged parts. Parts must be replaced, or repaired. Replace worn or damaged parts with Honda genuine parts. Non equivalent quality parts may damage the machine and be prejudicial to your safety. •...
  • Page 11 To ensure safe operation Operator Responsibility • Injury caused by vibration and cold: You may feel the prickling or burning pain in your fingers, and the fingers may lose color and feeling depending on your constitution. It is believed that these symptoms are brought by vibration and/or exposure to cold.
  • Page 12 To ensure safe operation Child Safety • Keep children indoors and supervised at all times any outdoor power grass/weed trimmer is being used nearby. Young children move quickly and are attracted especially to the grass/weed trimmer and trimming activity. • Never assume children will remain where you last saw them. Be alert and turn the grass/weed trimmer off if children enter the area.
  • Page 13 To ensure safe operation Fire and Burn Hazard Gasoline is extremely flammable, and gasoline vapor can explode. Use extreme care when handling gasoline. Keep gasoline out of reach of children. • Store fuel in containers specifically designed for this purpose. •...
  • Page 14 To ensure safe operation Carbon Monoxide Poisoning Hazard Exhaust contains poisonous carbon monoxide, a colorless and odorless gas. Breathing exhaust can cause loss of consciousness and may lead to death. • If you run the engine in an area that is confined or even partially enclosed, the air you breathe could contain a dangerous amount of exhaust gas.

  • Page 15: Safety Label Locations

    2. SAFETY LABEL LOCATIONS Your grass/weed trimmer must be used with care. Therefore, decals have been placed on the machine, to remind you pictorially of main precautions to take during use. Their meanings are explained on page 3. These decals are considered as a part of the grass/weed trimmer. Should one become detached or unreadable, contact your Honda dealer for its replacement.

  • Page 16: Component Identification

    3. COMPONENT IDENTIFICATION THROTTLE TRIGGER CUTTING BLADE GEAR CASE FRAME SERIAL NUMBER ENGINE SWITCH GRASS DEFLECTOR U SHAPED HANDLE...
  • Page 17 SPARK PLUG CAP (inside the top cover) SPARK PLUG TOP COVER CHOKE LEVER AIR CLEANER PRIMING MUFFLER PUMP FUEL RETURN TUBE ENGINE OIL FILLER CAP STARTER GRIP FUEL TANK CAP ENGINE SERIAL NUMBER FUEL TUBE Record the frame serial number (see page 15), engine serial number, date purchased in the spaces below.

  • Page 18: Controls

    4. CONTROLS 1.Engine switch The engine switch enables and disables the ignition system. The engine switch must be in the ON position for the engine to run. Turning the engine switch to the OFF position stops the engine. ENGINE SWITCH 2.Priming pump Pressing the priming pump feeds the gasoline from the fuel tank to the carburetor.
  • Page 19 3.Choke lever The choke lever opens and closes the choke valve in the carburetor. The CLOSED position enriches the fuel mixture for starting a cold engine. The OPEN position provides the correct fuel mixture for operation after starting, and for restarting a warm engine. CHOKE LEVER CLOSED CLOSED...
  • Page 20 5.Throttle trigger The throttle trigger controls engine speed. Pulling and releasing the throttle trigger shown below makes the engine run faster or slower. By pulling the throttle trigger THROTTLE TRIGGER gradually, the engine speed increases and the cutting attachment starts to run. Pull the throttle trigger more to accelerate the engine speed and the cutting rotating speed.

  • Page 21: Pre-Operation Check

    5. PRE-OPERATION CHECK For safe and efficient trimming, always make a pre-operation inspection before operating: Perform a pre-operation inspection on a firm, level surface with the engine stopped and make sure that the engine switch is in the OFF position. Before each use, look around and underneath the engine for signs of oil or gasoline leaks.
  • Page 22 Use 4-stroke motor oil that meets or exceeds the requirements for API service classification SE or later (or equivalent). Always check the API service label on the oil container to be sure it includes the letters SE or later (or equivalent). SAE 10W-30 is recommended for general AMBIENT TEMPERATURE use.
  • Page 23 2.Check the fuel level Use unleaded gasoline with a Research Octane Number of 91 or higher (a Pump Octane Number of 86 or higher). Never use gasoline that is stale, contaminated, or mixed with oil. Avoid getting dirt or water in the fuel tank. •...
  • Page 24 1.Check the fuel level visually from the outside of the fuel tank while keeping the fuel filler neck upright. 2.If the fuel level is low, refuel the fuel tank until the level as specified. Remove the fuel tank cap gradually to release a pressurized air in the fuel tank.
  • Page 25 NOTE: Gasoline spoils very quickly depending on factors such as light exposure, temperature and time. In worst cases, gasoline can be contaminated within 30 days. Using contaminated gasoline can seriously damage the engine (carburetor clogged, valve stuck). Such damage due to spoiled fuel is disallowed from coverage by the warranty.
  • Page 26 3.Check the air cleaner CAUTION: Never run the engine without the air cleaner; rapid engine wear will result. 1.Move the choke lever to the CLOSED (upwards) position. 2.Remove the air cleaner cover by unhooking the upper tab on the top of the air cleaner cover and its two lower tabs.
  • Page 27 4.Check the throttle cable free play CHOKE LEVER 1.Move the choke lever to the CLOSED (upwards) position. 2.Remove the air cleaner cover by unhooking the upper tab on the top of the air cleaner cover and its CLEANER COVER two lower tabs. UPPER TAB LOWER TABS 3.Check the throttle cable free play at the tip of the cable by pulling...
  • Page 28 5.Adjustment of the shoulder harness Be sure to wear the shoulder harness before using the grass/weed trimmer. Otherwise, injuries might occur due to its instability. 1.Wear the shoulder harness so that the hip pad is on the right side of your body •...
  • Page 29 3.Insert the end of the harness in to the hoop. HOOP Insert the end of the harness in to the hoop.
  • Page 30 6.Check the shoulder harness 1.Put on the shoulder harness. 2.Set the hook to the hanger. 3.Check that the hook is fastened to the hanger securely. SHOULDER HARNESS HOOK HANGER HIP PAD...
  • Page 31 7.Inspect the cutting attachment Cutting blade inspection: For safety, check the cutting blade for wear and damage and check the tightness of the cutting blade nut before starting the engine. Operating the grass/weed trimmer with a worn, cracked, or damaged cutting blade can cause a personal injury or equipment damage.
  • Page 32 8.Inspect the grass deflector • Never use the grass/weed trimmer without its grass deflector. Stones or other foreign objects thrown outward by the wheeling cutting attachment or contact with the wheeling cutting attachment could cause personal injury or property damage. 1.Stop the engine with the engine switch to the OFF position.
  • Page 33 9.Check the gear case For safety, check the gear case for wear and damage before starting the engine. CAUTION: Wear heavy gloves to protect your hands, when working around the gear case. Inspect the gear case: 1.Stop the engine with the engine switch to the OFF position. 2.Check if there is grass or thread tangled between the grass guard and cutting blade.
  • Page 34 Cleaning the gear case: If there is contaminated material such as grass, thread, mud, or dirt in between the gear case, grass guard, and blade holder A, clean them using the following procedure. 1.Stop the engine with the engine switch to the OFF position. 2.Remove the cutting blade.
  • Page 35 Inspect the drive bolt : Hold the drive bolt, move it left and right, and check if it is loose. If it is loose, the gear case must be replaced. Contact your Honda dealer for replacement. DRIVE BOLT GEAR CASE GRASS GUARD After "Cleaning the gear case", "Inspect the grass guard wear", and "Inspect the drive bolt", make sure to assemble blade holder A to the...
  • Page 36 10.Check all bolts and nuts Check the bolt and nut whether it is loosen before every work. If it was loosen the bolt and nut, please fasten it. 1.Check each bolt and nut for looseness. Tighten them securely if necessary. 2.Check the handle for loose mounting bolts or screws, and tighten them securely if necessary.

  • Page 37: Starting The Engine

    6. STARTING THE ENGINE • Exhaust gas contains poisonous carbon monoxide. Never run the engine in an enclosed area. Be sure to provide adequate ventilation. • Start the engine in a place away from the people, pets, and surrounding buildings. Be sure there are no obstacles in the working area.
  • Page 38 2.To start a cold engine, move the choke lever to the CLOSED position. To restart warm engine, leave the choke lever in the OPEN position. CLOSED CHOKE LEVER CLOSED OPEN OPEN 3.Press the priming pump several times until the priming pump is filled with fuel.
  • Page 39 4.Pull the starter grip lightly until you feel resistance while stepping on the carrying frame with your foot and holding the carrying frame with your hand, then pull briskly in the direction of the arrow as shown below. Return the starter grip gently. CAUTION: •...
  • Page 40 Carburetor Modification for High Altitude Operation. At high altitude, the standard carburetor air-fuel mixture will be too rich. Performance will decrease, and fuel consumption will increase. A very rich mixture will also foul the spark plugs and cause hard starting. Operation at an altitude that differs from that at which this engine was certified, for extended periods of time, may increase emissions.

  • Page 41: Trimming Operation

    7. TRIMMING OPERATION Read and understand the safety instructions on pages 3 to 13 before operating the grass/weed trimmer. If you notice any abnormal sound, smell, vibration, or other unusual signs, stop the engine immediately and consult your authorized Honda dealer.
  • Page 42 Cutting attachment applications: Your grass/weed trimmer is not designed to cut down the brush. Stop the engine and check the balance of the grass/weed trimmer between its front and rear sides. 1.Hold the grass/weed trimmer at the correct position. 2.Slacken your grip on the handle gradually. Do not release but put your both hands lightly on the handle, and be sure that the height of the cutting attachment from the ground does not change large this time.
  • Page 43 Basic operation: With the engine idling, hook the trimmer to your shoulder harness and hold the trimmer at the correct position. Be careful to avoid contact with the cutting attachment while handling the trimmer with the engine running. The cutting attachment should not rotate with the engine idling. If there is rotation at idle, adjust the idle speed correctly before using the trimmer.
  • Page 44 • Operate the grass/weed trimmer not by using your arm force but by using your waist so that the cutting attachment swings in a level arc from right to left. Hold the grass/weed trimmer so that you can shift your weight to the right leg then to the left leg safely and easily, and walk slowly with narrow strides.

  • Page 45: Stopping The Engine

    8. STOPPING THE ENGINE 1.Release the throttle trigger. 2.Turn the engine switch to the OFF position. CAUTION: Note that the cutting attachment keeps turning for a while by inertia after the engine is stopped. THROTTLE TRIGGER ENGINE SWITCH NOTE: Be sure that the engine is stopped and the cutting attachment stops turning before placing the grass/weed trimmer on the ground.

  • Page 46: Maintenance

    Replacement parts which are not of equivalent quality may damage the trimmer. Periodic inspection and adjustment of the Honda UMK425T is essential if high level performance is to be maintained. Regular maintenance will also help to extend service life. The required service intervals and the kind of maintenance to be performed are described in chart on the following page 46.
  • Page 47 Maintenance schedule REGULAR SERVICE PERIOD (3) First Every 3 Every 6 Every Every Each month months months year 2 years Refer Perform at every indicated month or operating hour interval, whichever comes first. 10 hrs. 25 hrs. 50 hrs. 100 hrs. 300 hrs.
  • Page 48 Tool kit The tools supplied are necessary for performing some periodic maintenance, simple adjustments and repairs. SPARK PLUG WRENCH 8×10mm WRENCH 5 mm HEXAGON WRENCH 4 mm HEXAGON WRENCH TOOL BAG...
  • Page 49 1.Engine oil change CAUTION: If the engine has been running, the engine, muffler and the engine oil are very hot and they remain hot for a while after stopping the engine. To protect you from burn, wait until they cool down before starting the oil change.
  • Page 50 NOTE: Please dispose of used motor oil in a manner that is compatible with the environment. We suggest you take it in a sealed container to your local service station for reclamation. Do not throw it in the trash or pour it on the ground.
  • Page 51 2.Air cleaner service A dirty air cleaner will restrict air flow to the carburetor. To prevent carburetor malfunction, service the air cleaner regularly. Service more frequently when operating the grass/weed trimmer in extremely dusty areas. Never use gasoline or low flash point solvents for cleaning the air cleaner element.
  • Page 52 3.Clean in warm soapy water, rinse and allow to dry to thoroughly. Or clean in high flash point solvent and allow to dry. Dip the element in clean engine oil and squeeze out all the excess. The engine will smoke during initial startup if too much oil is left in the foam.
  • Page 53 3.Cutting attachment replacement Cutting blade: • To avoid severe personal injury, make sure that the engine switch is in the OFF position to prevent accidental starting. • Use a genuine Honda replacement cutting blade or its equivalent. CAUTION: Wear heavy gloves to protect your hands, when working around the cutting blade.
  • Page 54 4.Grass deflector replacement Install the grass deflector in the proper position securely to protect you from the debris that are thrown from a wheeling cutting attachment. CAUTION: Wear heavy gloves to protect your hands, when working around the cutting attachment. Installation position of grass deflector 1.Place the grass deflector in a position that allows it to touch the gearbox.
  • Page 55 5.Spark plug service Recommended spark plug: CMR5H (NGK) To ensure proper engine operation, the spark plug must be properly gapped and free of deposits. If the engine has been running, the muffler will be very hot, be careful not to touch the muffler. CAUTION: Never use a spark plug of incorrect heat range.
  • Page 56 4.Measure the plug gap with a feeler gauge. Correct as necessary by carefully bending the side electrode. The gap should be: 0.6 – 0.7 mm SIDE ELECTRODE 0.6–0.7 mm WASHER INSULATOR 5.Check that the spark plug washer is in good condition and thread the spark plug in by hand to prevent cross-threading.
  • Page 57 6.Throttle cable check and adjustment Adjust the throttle cable free play properly. Adjustment: 1.Move the choke lever to the CLOSED (upwards) position. CHOKE LEVER 2.Remove the air cleaner cover by unhooking the upper tab on the top of the air cleaner cover and its two lower tabs.
  • Page 58 6.Operate the throttle system several times and check it has the free play (i.e. throttle lever does not move while operating the throttle trigger). After adjustment, check the throttle trigger for smooth operation. Consult your authorized Honda dealer if necessary. THROTTLE TRIGGER 7.Reinstall the air cleaner cover by inserting the lower tabs, then insert the upper tab.
  • Page 59 7.Engine cooling fin inspection Inspect the cooling fin visually through the cover. If there are dry grass, leaves and mud clogged, consult your authorized Honda dealer for cleaning it. COOLING FINS (Inside the top cover)
  • Page 60 8.Fuel filter and fuel tank cleaning Note that the clogged fuel filter can cause poor engine performance. Water and dust, dirt or contaminated material in the fuel tank cause a poor engine performance. Gasoline is extremely flammable and is explosive under certain conditions.
  • Page 61 3.Pull out the fuel filter with the mechanic’s wire from the fuel filler neck gently. MECHANIC’S WIRE FUEL FILTER 4.Check the fuel filter of its dirt. If the fuel filter is dirty, wash it gently with nonflammable or high flash point solvent. If the fuel filter is excessively dirty, replace it.
  • Page 62 9.Fuel tube check Check fuel tubes for cracks and any other deterioration and confirm that there is no leakage of fuel on the fuel tubes. If you notice any abnormal symptoms on the fuel tubes, contact an authorized Honda dealer. FUEL TUBES 10.Grease of gear case 1.Remove the hex bolt of gear case.

  • Page 63: Transporting

    10. TRANSPORTING CAUTION: To avoid severe burns or fire hazards, let the engine cool before transporting the grass/weed trimmer. Always turn the engine switch to the OFF position. Make sure the fuel cap is securely tightened. Carrying the grass/weed trimmer by hand: Attach it to the shoulder harness or hold the main pipe ...

  • Page 64: Storage

    11. STORAGE Proper storage preparation is essential for keeping your grass/weed trimmer trouble free and looking good. The following steps will help to keep rust and corrosion from impairing your grass/weed trimmer. CAUTION: • If the grass/weed trimmer has been running, the engine will be very hot;...
  • Page 65 c. Press the priming pump several times until all fuel has returned to the fuel tank. FUEL RETURN TUBE PRIMING PUMP FUEL TANK CAP d. Tip the engine toward the fuel filler neck again to drain the fuel left in the fuel tank into the container.

  • Page 66: Troubleshooting

    12. TROUBLESHOOTING When the engine will not start: 1.Is the engine switch in the ON position? 2.Is there fuel in the fuel tank (see page 22)? Gasoline is extremely flammable and explosive under certain conditions. Do not smoke or allow flames or sparks in the area. 3.Is gasoline reaching the carburetor? To check, press the priming pump several times (see page 37).

  • Page 67: Specifications

    13. SPECIFICATIONS MODEL UMK425T Power product description code HAJT Frame TYPE U2ST Handle type U handle Clutch type Centrifugal clutch Type 2-teeth blade O.D. 300 mm Cutter Number of rotation 5,158 rpm (When engine rotation speed 7,000 rpm) Overall length (With blade)
  • Page 68 Engine MODEL UMK425T Engine model GX25T Engine description code GCALT Engine type 4-stroke, overhead cam, 1 cylinder Displacement 25.0 cm Bore and Stroke 35.0 × 26.0 mm Engine Net power 0.72 kW/7,000 rpm (in accordance with SAE J1349*) Engine max. Net torque 1.0 N∙m/5,000 rpm...
  • Page 69 MEMO...
  • Page 70 Honda Motor Co., Ltd. 2017 42VR26001 Printed in Thailand 00X42-VR2-6001...

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