The DAEWOO DMT520 is a multifunctional brush cutter designed for various landscaping and gardening tasks. It is a versatile tool that can be adapted for different cutting needs, including trimming, pruning, and brush cutting.
Function Description
The DMT520 operates as a brush cutter with interchangeable attachments, allowing it to perform multiple functions. It is equipped with a centrifugal clutch mechanism, which means the cutting attachment begins to rotate as soon as the engine starts and the throttle is engaged. The device can be used with a trimmer blade for cutting grass and light weeds, a 3T blade for heavier weeds and brush, and a chain saw attachment for pruning branches. A nylon line head is also available for lighter trimming tasks.
Important Technical Specifications
The brush cutter is powered by a single-cylinder, 2-stroke, air-cooled engine.
- Engine: Single cylinder, 2 stroke, air cooled
- Power: 2.2 kW / 3 hp
- Displacement: 52 cc
- Fuel tank capacity: 1200 ml
- Noise level: 113 dB
- Rated speed: 7500 rpm
- Max engine speed: 9000 rpm
- Start: Recoil
- Clutch type: Centrifugal
- Gasoline/oil mixture: 25:1
- Cutting head: 400-450 mm
- Cutting blade: 3T
- Cutting width: 255 mm for cutting blade / 400-450 mm for cutting head
Usage Features
The DMT520 is designed for user comfort and safety. It features a loop handle and a throttle set button for easy control. The device includes a quick joint for attaching different tools, such as the trimmer blade, bar and chain for the pruning saw, and the 3T blade or nylon head for brush cutting.
Safety Precautions:
- Users must read the owner's manual before operation and wear head, eye, ear, foot protection, and gloves.
- Bystanders and helpers should be kept at least 15 meters (50 feet) away from the machine during operation to avoid injury from thrown objects.
- The machine should not be operated in slippery conditions, at night, in heavy fog, or when visibility is limited.
- Avoid using the product during rain storms, lightning storms, or strong winds.
- Never operate the product under the influence of alcohol, when exhausted, or when judgment might be impaired.
- The working area should be clear of hidden obstacles like stumps, stones, cans, or broken glass.
- Always use the harness and adjust it so the left hand can comfortably hold the handlebar grip at waist height.
- Never place the throttle in the high-speed position when starting the engine.
- Maintain a steady posture with feet slightly apart to distribute weight evenly.
- Keep the cutting attachment below waist level and maintain appropriate engine speed for the task.
- If the unit shakes or vibrates, turn off the engine and inspect for issues.
- Keep all body parts away from rotating cutting attachments and hot surfaces.
- Never touch the muffler, spark plug, or other hot metallic parts during operation or immediately after shutting down.
- When using the pruner, do not operate at an angle greater than 60 degrees to reduce the risk of falling objects.
- Maintain a clearance of at least 15 meters from electrical lines when using the pole saw.
- When using the saw chain, wear protective gloves due to sharp edges.
- Pay attention to the correct direction of the saw chain installation.
- Ensure proper chain tension to prevent rapid wear of the guide bar or the chain coming off.
- Gasoline is highly flammable; avoid smoking or open flames near fuel. Refuel outdoors on bare ground, at least 3 meters (10 feet) away from the starting point.
- Stop the engine and allow it to cool before refueling.
- Use a gasoline-to-oil mixture of 25:1 (when using genuine oil). Using lower octane gasoline can cause engine temperature to rise and lead to piston seizing.
- Never use raw gasoline (without oil) as it will severely damage internal engine parts.
- Gasohol can deteriorate rubber and plastic parts and disrupt engine lubrication.
- Do not use 4-cycle engine oil as it can cause spark plug fouling and piston ring sticking.
- Mixed fuels left unused for a month or more can clog the carburetor.
- When storing the product for a long time, clean the fuel tank and carburetor.
- Do not use wasted or regenerated oil.
- When starting, set the stop switch to the "-" position and the throttle trigger to the start position.
- Pull the starter rope quickly until the engine fires.
- Move the choke lever downward to open the choke for restarting.
- Allow the engine to warm up for several minutes before operation.
- To stop the engine, release the throttle lever, run the engine for half a minute, then shift the stop switch to the "STOP" position.
- If the engine doesn't stop, move the choke lever to the closed position.
- Adjust the throttle cable to ensure normal play of 1 or 2 mm.
- Adjust idling speed by turning the adjusting screw counter-clockwise when the engine tends to stop at idling mode.
- The cutting head will start rotating upon engine start; ensure it is clear of obstacles.
- For blade usage, choose the appropriate cutting attachment (9" 8-tooth, 9" 4-tooth, or nylon line head) based on the type of weeds or grass.
- When replacing or sharpening blades, wear thick, sturdy gloves and use proper tools.
- Ensure the cutting attachment guard is suitable for the metal blade.
- Tighten the blade nut to a torque of 1.5 - 2.0 N.m. (0.15-0.2 kg.m.).
- When using the blade, use the front left side for cutting and guide it from right to left, tilted slightly to the left.
- Adjust engine speed and cutting depth to prevent the blade from seizing in weeds.
- If grass or objects get caught in the blade, or if the unit shakes, turn off the engine and inspect the blade for damage.
- Ensure the blade is not bent, warped, cracked, or broken. Replace damaged blades with certified ones.
- Hang the unit on your right side using the shoulder strap, adjusting its length so the cutting head is parallel to the ground.
- Be aware of blade thrust, which can occur if the blade contacts an object it cannot cut. Maintain a firm grip and balanced stance.
- Do not overreach and ensure firm footing.
Maintenance Features
Regular maintenance is crucial for the DMT520's longevity and performance.
Daily/Before Use:
- Fuel leaks, fuel spillages: Wipe out.
- Fuel tank, air filter, fuel filter: Inspect/clean.
- Idle adjusting screw: See adjusting.
- Idling speed: Clean and readjust.
- Spark plug: Plug gap.
- Cylinder fins, intake air cooling vent, muffler, spark arrester, cylinder exhaust port: Clean.
- Throttle trigger, stop switch: Check operation.
- Cutting parts: Replace if fittings wrong.
- Transmission: Grease.
- Screws/nuts/bolts: Tighten/replace.
- Cutting attachment guard: Make sure to attach.
- Oiling port: Clean.
- Guide bar: Clean.
- Sprocket: Inspect/replace.
- Saw chain: Inspect/sharp.
Every 25 Hours (or more often depending on job condition):
- Angle transmission: Lubricate with multipurpose, lithium-based grease. Remove cutter holders before adding new grease.
- Transmission: Lubricate reduction gears with multipurpose, lithium-based grease. Use a grease gun to insert lubricant into the three grease nipples.
- Spark plug: Clean and check the plug gap (0.6-0.9mm). Replace if necessary with the correct type. Tighten to 0.8-1.1 N.m. (1-1.2 kg.m.).
- Muffler: Inspect for loose fasteners, damage, or corrosion. Repair immediately if exhaust leakage is found.
- Intake air cooling vent: Clean to prevent overheating.
- Air filter: Check and clean the filter element. Replace if broken or shrunk.
- Fuel filter: Check for blockage and clean.
Every 100 Hours:
- Muffler: Remove carbon buildup from the muffler exhaust vent and cylinder exhaust port.
- Screws, bolts, and fittings: Tighten all.
- Clutch lining and drum: Check for oil or grease and wipe away with oil-free, lead-free gasoline if present.
Trimming Line Refilling:
- Use replacement line with a diameter of 2.4mm (.095in). The spool holds up to 6m (20ft) of line.
- Do not use metal-reinforced line.
- Pinch the slotted area on the spool housing to unhook the bottom cap.
- Remove the old line and insert one end of the new line through the spool holes, pulling until the length is equal on both sides.
- Wind the line in the correct direction indicated on the spool.
- Hook each end of the line in the slot on the spool edge and feed them through the eyelets on the housing.
- Ensure the spring and washers are in place.
- Hold the spool against the housing, pull the line ends to release them from the slot, and align the slot on the bottom cap with the hook on the housing, then press the cap until it clicks.
Blade Maintenance:
- Sharpening: Check the blade and fasteners for looseness, cracking, or bending. Reform cutting edges with a flat file.
- Saw blade: Filing should be done by professionals.
- Guide bar: Dismount and check the oiling port for clogging. Remove sawdust from the bar groove and oiling port. Grease the nose sprocket from the feeding port.
- Sprocket: Check for extensive wear (over 0.3mm) and replace if necessary.
- Saw chain: Keep cutters sharp. Sharpen when sawdust becomes powder-like, extra force is needed to saw, the cut is not straight, vibration increases, or fuel consumption increases.
- Filing: Wear safety gloves. Ensure the saw chain is held securely and the engine is stopped. Use a round file of proper size. Place the file on the cutter and push straightforward, maintaining the illustrated position. After setting each cutter, check the depth gauge and file it to the proper level. Round off the front edge to reduce kickback. Ensure all cutters have the same length and edge angles.
Transporting the Unit:
- Turn off the engine, lift the unit, and carry it, paying attention to the blade.
- Always place the protective cover over the blades.
- For long distances, detach the blade and fasten the unit with ropes.
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