MechMaxx B150 Wood Chipper

Specifications

Overall Dimensions

The overall dimensions of the wood chipper are approximately:

• Length: 57.2 inches (1453mm)
• Width: 47.9 inches (1217mm)
• Height: 108.8 inches (2764mm)

Safety Signs

The rating plate on your machine may show symbols. These represent important information about the product or instructions on its use.

? DANGER ?: General hazard warning.

⚠️ WARNING ⚠️: Indicates a potentially hazardous situation.

? EMERGENCY STOP ?: Push to stop the engine immediately.

Belt Tension Check: Check belt tension before operating. Belt deflection should be less than 3/8" when 10lb of pressure is applied. Re-check and adjust after the first 1-2 hours of use and every 20 hours thereafter for optimal performance.

⛽ FUEL ⛽: Indicates fuel location. Risk of fire. Allow engine to cool for 1 minute before refueling. Use unleaded petrol.

? MAX. 6 inches ?: Do not place wood or branches over 6 inches in diameter into the in-feeding bin to avoid jamming.

General Safety Icons:

• Read manual: ?
• Keep guards in place: ?️
• Keep hands/feet away from openings: ✋?
• Hearing protection: ?
• Safety glasses: ?
• Gloves: ?
• No loose clothing/jewelry: ❌??
• Keep bystanders away: ?‍♂️?‍♀️
• Hot engine/muffler: ?
• Avoid fire hazard: ❌?
• Do not operate on uneven ground: ❌⛰️
• Do not operate on hard surfaces: ❌?️
• If chipper jams, shut off engine and wait for parts to stop: ?⚙️
• Do not service while engine is running: ❌?
• Keep children away: ?❌

Safety

General Safety Rules

• Read this manual and labels affixed to the machine to understand its limitations and potential hazards.
• Be thoroughly familiar with the controls and their proper operation. Know how to stop the machine and disengage the controls quickly.
• Read and understand the Engine Manufacturer's manual packed separately with your unit.
• If the unit is loaned, rented, or sold, provide this manual and safety training to the new user.
• The user is responsible for accidents or injuries.
• Always use the correct machine for your job.

Personal Safety

• Do not permit children to operate this machine.
• Keep children, pets, and others away from the work area. Be alert and shut off the unit if anyone enters.
• Do not operate under the influence of drugs, alcohol, or impairing medication.
• Dress properly: wear heavy long pants, boots, and gloves. Avoid loose clothing, short pants, or jewelry. Secure long hair. Keep hair, clothing, and gloves away from moving parts.
• Protect eyes, face, and head with safety goggles or safety glasses with side shields.
• Wear appropriate hearing protection.
• Always keep hands and feet away from all moving parts and pinch points during operation.
• Do not touch hot parts. Allow parts to cool before maintenance.
• Stay alert, watch what you are doing, and use common sense.
• Do not overreach. Do not operate barefoot or in sandals. Wear protective footwear. Keep proper footing and balance.

Inspect Your Machine

• Check your machine before starting. Keep guards in place and working order. Ensure all nuts and bolts are tightened.
• Never operate a machine in need of repair or in poor mechanical condition. Replace damaged, missing, or failed parts. Check for fuel leaks.
• Ensure the engine switch operates correctly. A machine that cannot be controlled by the engine switch is dangerous.
• Regularly check that keys and adjusting wrenches are removed before starting.
• Avoid accidental starting: ensure the engine switch is off before transporting or performing maintenance.
• If the machine vibrates abnormally, stop the engine and check for the cause.

Engine Safety

• This machine has an internal combustion engine. Do not use on unimproved, forest-covered, or brush-covered land unless the exhaust system has a spark arrester.
• Never start or run the engine inside a closed area due to dangerous carbon monoxide fumes. Operate only in a well-ventilated outdoor area.
• Do not tamper with the engine to run it at excessive speeds.
• Keep a Class B fire extinguisher on hand in dry areas.

Fuel Safety

• Fuel is highly flammable and its vapors can explode. Take precautions to reduce the chance of injury.
• When refilling or draining the fuel tank, use an approved fuel storage container in a clean, well-ventilated outdoor area.
• Do not smoke, or allow sparks, open flames, or other ignition sources near the area. Never fill the fuel tank indoors.
• Keep grounded conductive objects away from exposed electrical parts to avoid sparking.
• Always stop the engine and allow it to cool before filling the fuel tank. Never remove the cap or add fuel while the engine is running or hot.
• Do not operate with known leaks in the fuel system.
• Loosen the fuel tank cap slowly to relieve pressure.
• Never overfill the fuel tank. Leave space for expansion (approx. ½ inch below filler neck).
• Replace fuel tank and container caps securely and wipe up spilled fuel.
• Avoid creating ignition sources for spilled fuel. Move the machine away from spillage and wait for vapors to dissipate before starting.
• If fuel spills on you or your clothes, wash skin and change clothes immediately.
• Store fuel in approved containers in a cool, well-ventilated area, away from ignition sources.
• Never store fuel or a machine with fuel inside a building where fumes can reach ignition sources (e.g., water heater, furnace). Allow the engine to cool before storing in an enclosure.

Specific Safety Rules

• Identify hazards and take preventive steps. Possible hazards include moving parts, thrown objects, weight, and operating environment.

Prior to Starting

• Thoroughly inspect the work area, keeping it clean and free of debris.
• Operate on flat, level ground.
• Ensure the feed hopper and cutting housing are empty and free of debris.
• Check oil level, ensure all nuts and bolts are tight, and check tire pressure.

Operation Safety

• Never place any part of your body where it would be in danger if movement should occur.
• Keep all bystanders and pets at least 75 feet away. Stop the unit immediately if approached.
• Never place hands, feet, or body parts in the chipper hopper, discharge opening, or near moving parts while the machine is running.
• Keep the discharge area clear of people, animals, buildings, glass, or anything that obstructs discharge.
• Wind can change discharge direction; be aware.
• If pushing materials into the hopper, use a small-diameter stick, not your hands.

Operation

Feeding Materials

• Keep your face and body back from the chipper hopper and discharge chute to avoid injury from accidental bounce back.
• Never reach with your hands inside the feed hopper past the rubber flap while operating.
• Keep combustible substances away from the engine when it is hot.
• Do not tilt the machine while the engine is running.
• Never operate without the feed hopper or discharge chute properly attached.

Operating Zone: The diagram shows the general layout of the machine.

• Feed only clean materials into the machine. Foreign matter (soil, sand, grit, stones, metal) will damage knives. Root balls and dead wood will dull blades.
• Avoid feeding pine needles, flax, and cabbage tree leaves, as these stringy materials can wrap around the rotor shaft and bearings.
• Avoid feeding short, stubby pieces of wood; they tend to bounce. Feed them with longer pieces.
• This machine is self-feeding; do not force branches. Allow the machine to feed automatically. Allow the machine to reach full spinning revolutions before feeding the next load.

Unclogging

• Never allow processed material to build up in the discharge area, as this can cause kickback.
• Never attempt to unclog the feed hopper or discharge chute while the engine is running. Immediately shut off the engine, wait for the cutting disk to stop completely, then remove clogged material. Inspect for damage and loose parts.
• Whenever leaving the operating position or removing material, shut down the engine, ensure it's switched off, and wait for all moving parts to stop.
• Before opening the cutting disk housing, ensure the engine is off, the cutting disk is stopped, and the belt drive is disengaged.

Moving

• Move the machine at least 10 feet away from the refueling point before starting the engine.
• This wood chipper is for movement by hand only. Never tow on public highways or roads.
• Always stop the engine before moving the machine. Watch out for sharp objects that could pierce tires.

Machine Use and Care

• Position the machine so it cannot move during maintenance, cleaning, adjustment, or storage.
• Always use the correct machine for your job.
• Do not adjust the engine governor settings or operate the engine above the recommended speed.

Maintenance

Maintaining your Wood chipper will ensure long life to the machine and its components.

Preventive Maintenance

1. Turn off the engine. The engine must be cool.
2. Keep the engine's throttle lever in the SLOW position and remove the spark plug wire from the spark plug.
3. Inspect the general condition of the wood chipper. Check for loose screws, misalignment, binding, cracked or broken parts.
4. Remove all debris with a soft brush, vacuum, or compressed air. Lubricate all moving parts with a premium quality lightweight machine oil.
5. Replace the spark plug wire.

⚠️ Never use a pressure washer to clean your Wood chipper. Water can penetrate tight areas and cause damage to spindles, pulleys, bearings, or the engine.

? Shut down the engine, wait for all moving parts to stop, remove the spark plug wire, and wait five minutes before performing maintenance.

Regular Maintenance Checklist

The service intervals shown are maximums under normal operating conditions. Increase frequencies under extremely dirty or dusty conditions.

Grease the Outside Bearing

There are two bearings, one outside and one inside the housing. They are greased when new but should be greased after a couple hours of use (one or two pumps). Be careful not to over-grease.

1. Open the plastic oil plug.
2. Grease the outside bearing through the filling hole.
3. Close the plastic oil plug.

Grease the Inside Bearing

1. Loosen the lock nut which holds the discharge chute on the machine.
2. Slide down the fixing plate under the lock nut.
3. Open, then grease the inside bearing.

Knife and Wear Plate Inspection

Routinely inspect knives (for sharpness) and wear plate (for edge condition) for full efficiency. Dull knives or a rounded wear plate decrease performance and cause excessive vibration.

If the machine's cutting disk strikes a foreign object, or if the machine begins to make an unusual noise or vibrates excessively, immediately shut off the engine. Allow the cutting disk to stop. Switch the engine to "off". Then:

• Inspect for damage.
• Repair or replace damaged parts.
• Check for any loose parts and tighten to ensure safe operation.

Assembly

Axle

Attach the wheel axle to the cutter base with M14x140 hex bolts, flat washer 14, and M14 lock nuts. (See Figure 1)

Wheels

Attach the wheels to the wheel axles with M10x25 hex bolts, M10 lock nuts, and flat washer 10. (See Figure 2)

Tower Bar Mount

Attach the tower bar mount to the base frame with M12x35 hex bolts, Spring Washer 12, and flat washer 12. (See Figure 3)

Tow Bar and Guiding Wheel

Attach the tow bar to the tow bar mounts with M10x70 hex bolts, M10 lock nuts, and flat washer 10. (See Figure 4)

Attach the module to the tow bar mounts with M10x80 hex bolts and pin R 12x25. (See Figure 4)

Attach the wheels to the module with split pin 5x32. (See Figure 4)

Lower Expulsion Chute

Attach the lower expulsion chute to the cutter base using two lock catches. (See Figure 5)

360-Degree Upper Expulsion Chute

Attach the upper expulsion chute to the lower expulsion chute with an adjustable locking handle. (See Figure 6)

Battery

Attach the battery box to the wheel axle with M10x80 hex bolts, M10 lock nuts, and flat washer 10. (See Figure 7)

Infeed Chute

Attach the feeding chute to the cutter base with two lock catches. (See Figure 8)

Know Your Machine

Identify the main components of your wood chipper:

• Deflector
• Deflector Lever
• Emergency Stop
• Engine
• Feed chute
• Battery
• Wheels
• Recoil Starter Handle
• Throttle Control
• Choke Control
• Fuel Shut-Off Valve

Operation

Add Oil to Engine

Note: The engine is shipped without oil. Do not start the engine before adding oil. Do not overfill; check the engine oil level daily and add as needed.

1. Ensure the wood chipper is on a flat, level surface.
2. Remove the oil fill cap/dipstick and add oil up to the FULL mark. (See engine manual for oil capacity, recommended oil type, and location of the fill cap.)
3. Using a funnel, add oil up to the FULL mark on the dipstick.

Add Gasoline to Engine

⚠️ Gasoline is highly flammable and explosive. Use extreme care.

• Fill the fuel tank outdoors, never indoors. Gasoline vapors can ignite if they collect inside an enclosure, potentially causing an explosion.
• With the engine off and cool (at least two minutes), remove the fuel filler cap and fill the tank. (See engine manual for fuel capacity, recommended fuel type, and location.)
• Fill the fuel tank outdoors.

❗ IMPORTANT: DO NOT OVERFILL! This equipment may include evaporative emissions control system components. Overfilling can cause permanent damage. Filling to the recommended level ensures a vapor gap for fuel expansion. Use a portable gasoline container with an appropriately sized dispensing spout. Do not use a funnel or other device that obstructs the view of the tank filling process.

Reinstall and tighten the fuel cap, and clean up any spilled fuel.

Starting Engine

1. Move the engine switch to the ON position.
2. Open the fuel shut-off valve.
3. Move the choke lever to the CLOSED position (unless the engine is hot).
4. Move the throttle lever slightly to the FAST speed.
5. Pull the recoil starter until engine compression is felt. Let it return, then pull quickly to start. Repeat as needed. Fully open the choke and set the throttle to FAST before operating.

⚠️ Rapid retraction of the starter cord (kick-back) may pull your hand and arm toward the engine, potentially resulting in broken bones, fractures, or bruises.

Operating

• After the engine warms up, pull the throttle lever to accelerate engine speed.
• The wood chipper can process dry and green organic materials up to 6-inch diameter branches. This capacity may vary by wood type and hardness. Rotating the branch as you feed it can improve performance.
• Feed limbs or branches cut-end first, leaving the bushy head on. This guides the limb down the feed hopper and reduces spinning/bouncing. Pre-cutting side branches may help self-feeding.
• Process freshly cut materials; dried wood becomes springy and dulls knives faster.
• Keep a wooden stick (approx. 1" diameter x 2 ft long) handy to push short, brushy, or leafy materials and keep the feed hopper clear.
• Do not force material. If it doesn't chip well, knives may need sharpening/replacement, or the gap between knives and wear plate needs adjusting.
• Do not overload the machine. If engine speed decreases, stop feeding material until the engine returns to full speed.
• The chipper can clog with soft, wet, or fibrous materials. Feeding these intermittently with branches should prevent issues.
• If stringy material wraps around the rotor shaft, remove it before it works into the bearing.

Idle Speed

Set the throttle control lever to the SLOW position to reduce stress on the engine when chipping is not being performed. This extends engine life, conserves fuel, and reduces noise.

Stop Engine

For Emergency Stop: Turn the engine switch to the OFF position.

Normal Stop Procedure:

1. Move the throttle lever to the SLOW position.
2. Let the engine idle for one or two minutes.
3. Turn the engine switch to the OFF position.
4. Turn the fuel valve lever to the OFF position.

⚠️ Sudden stopping at high speed under heavy load is not recommended; engine damage may result.

⚠️ Do not move the choke control to CLOSE to stop the engine; backfire or engine damage may occur.

Wait until the machine completely stops. Allow the engine to cool. Clean the interior of the machine and its discharge chute.

⚠️ Do not disengage the belt drive with the machine running; this will cause friction and vibration.

Transporting

Your wood chipper has two large pneumatic wheels for maneuverability. To move the unit, grip the handles and tilt the chipper slightly. Ensure the oil tank cover is securely tightened beforehand.

Troubleshooting

Storage

If your Wood chipper will not be used for more than 30 days, follow these steps for storage:

1. Drain the fuel tank completely. Stale fuel has high gum content and can clog the carburetor.
2. Start the engine and let it run until it stops. This ensures no fuel is left in the carburetor.
3. Drain the oil from the engine while it is still warm. Refill with fresh oil of the grade recommended in the engine manual.
4. Allow the engine to cool. Remove the spark plug and put 60 ml of SAE-30 high-quality engine oil into the cylinder. Pull the starter rope slowly to distribute the oil. Replace the spark plug.

⚠️ Remove the spark plug and drain all oil from the cylinder before attempting to start the unit after storage.

5. Use clean cloths to clean the outside of the Wood chipper and keep air vents free from obstructions.

⚠️ Do not use strong detergents or petroleum-based cleaners on plastic parts, as they can cause damage.

6. Store your wood chipper in an upright position in a clean, dry building with good ventilation.

⚠️ Do not store your wood chipper with fuel in a non-ventilated area where fuel fumes could reach ignition sources. Use only approved fuel containers.

Knife Removal and Replacement

This Wood chipper has two chipper knives mounted on the cutting disk. Replace dull or nicked knives to maintain self-feeding action.

1. Remove the feed hopper.
2. Remove the discharge chute.
3. Rotate the cutting disc until the blade is visible from the feed hopper side.
4. Remove the bolts and nuts that fix the blade.

⚠️ Be careful and wear gloves when working near the knives.

Remove dull or damaged knives. Inspect the cutting disk slot and mounting area. Ensure they are clean and that new knives will mount flush. Remount new or sharpened knives with edges facing up.

⚠️ If the cutting disk surface is not cleaned properly and knives are not mounted flush, they could crack when hardware is tightened.

The clearance between the knives and wear plate should be approximately 0.04 inch at the closest point to the rotor shaft and 0.12 inch at the farthest point. They are tapered slightly.

Ensure all locknuts are tightened properly. Turn the cutting disk with a long wooden stick to ensure it rotates freely.

Belt Adjustment

The belt should deflect 3/8" under three pounds of pressure. If not, adjust as follows:

Figure 1: Shows belt deflection measurement.

1. Remove belt guard.
2. Loosen engine bolts.
3. Tighten or loosen the nut until correct tension is achieved.
4. Retighten engine bolts.
5. Check alignment of the clutch with the drive pulley using a straight edge. If adjustment is needed, move the rotor pulley in or out on the rotor shaft. Do not adjust by moving the clutch on the engine shaft.
6. Replace belt guard.

Belt Replacement

1. To replace the belt, follow the belt adjustment directions above.
2. After loosening engine bolts, remove old belts and replace with new ones. Always replace both belts as they come in a matched set.
3. Set belt tension and alignment according to instructions.

❗ NOTE: Check and re-tighten belts after the initial break-in period (one hour of use).

Centrifugal Clutch Tech Tips

Clutch shoes and springs are wear items. If performance decreases, check and replace if necessary.

The clutch is designed for rugged service, providing load-free starting and allowing slippage under excessive overloading to protect the engine. It obtains power from engine RPMs. Lower engagement speed and higher maintained engine speed transfer more torque. Do not operate at less than full RPMs.

At engine start-up, the chipper's engine operates under no load until approximately 1,000-1,200 RPMs, when the centrifugal clutch engages.

The proper rotor speed is 2,200 RPM ± 200 RPM at full engine RPM.

⚠️ Do not tamper with the engine's governor setting. Over-speeding is dangerous and will cause engine damage. Consult an authorized dealer for governor adjustments.

Become familiar with successful operating conditions and avoid those that can overload or damage the machine.

⚠️ Do not overload or attempt to chip material beyond recommendations. Personal injury or machine damage could result.

Learn to recognize the sound of an overloaded machine. If jammed, stop immediately.

If the machine jams and the engine is not stopped, it can burn the belt or ruin the clutch.

Operator experience determines how quickly limbs can be fed successfully. Clutch damage is costly and not covered under warranty; shut off the machine immediately if it becomes jammed.