NAKAYAMA PM4810 Gasoline Lawn Mower Instruction Manual

NAKAYAMA PM4810 Gasoline Lawn Mower

Safety instructions

Your safety and the safety of others are very important. We have provided important safety messages in this manual and on the mower. This information
alerts you to potential hazards that could hurt you or others. Please read these messages carefully. Of course, it is not practical or possible to warn you about all the hazards associated with operating or maintaining a lawn mower. You must use your own
good judgment.

• Read the instruction manual before using the machine.
• Keep other people at a safe distance while working
• Remove the spark plug cable from the spark plug and read instructions before carrying out any repair or maintenance.
• Blades in movement. Do not put hands or feet near or under the opening of the cutting plate.
• Do not use on hills above 22°
• Do not touch rotating parts.
• Stop the engine before cleaning of work area.
• Warning: Always use correct tools and original spare parts.
• Warning: The blade is sharp, do not touch the blade.
• Keep bystanders, especially children away!

General Conditions Of Use
This machine is to be used exclusively for cutting natural grass. Never use the mower for other purposes. Any other utilization can involve danger for your safety and can involve damage to the mower.
Persons under 16 years of age and persons who are not familiar with the user instructions must not use the mower.
The user is responsible of the safety of other people in the working area. Keep children and domestic animals at a safe distance while the mower is in use.
Before mowing, remove all foreign object from the lawn which may be thrown by the machine, stay alert for any foreign objects which may have been missed.

• Check that all nuts, bolts and screws are well tightened.

• Before mowing place the grass catcher in its position.

• Before mowing make sure that the blade and the blade fixing screw are securely fastened. When cutting edges require rehappening, this must be done  evenly on both sides so as to prevent any imbalance. If the blade is damaged, it must be replaced.

• When mowing always wear a long trousers and strong footwear.

• Do not run the engine in an enclosed and/or poorly ventilated area, where gas of the engine contains carbon monoxide, which are dangerous for your health.

• Do not use the lawnmower when it is raining or when the grass is wet.

• Particular precautions must be taken while mowing on slopes or downing stretches. Mow across the face of slopes, never down or up.

• Turn off the engine if you must leave the lawnmower unattended, displace the lawnmower or incline it.

• Never lift the rear of the mower while starting the engine and never place your hands and feet underneath the deck or into the rear discharge chute while the engine is running.

• Never change in any way the rated speed of the engine.

• On the self-propelled mowers, disconnect the self-propelled system before starting the engine.

• Never lift or carry the mower while the engine is running.

• Stop the engine and remove the spark plug cover in these cases:

  • Before any operation under the deck or the grass rear discharge chute.

  • Before any maintenance, repairing or checking operations.

  • Before carrying, lifting or removing the mower.

  • If you leave the mower unattended or changing the cutting height.

  • To remove and emptying the grass catcher.

  • After hitting a foreign object, stop the engine and check thoroughly the mower in order to see if it is damage. Bring the mower in a agreed service station to do the repairing if necessary.
    Warning! After you stopped the engine the blade is still in motion during a few seconds.

  • If the mower vibrates in an abnormal way, find the reasons why, and take your mower to an agreed service station.

  • Check regularly that bolts, nuts and screw are secularly tightening for a safe use of the mower.

Warning! GASOLINE IS HIGHLY INFLAMMABLE!

• Keep gasoline in a jerry can specially made for this purpose.
• Fill up the tank with a funnel, do the operation outside. Do not smoke. Do not use mobile phone.
• Fill up with gasoline and oil before staring the engine. Never open the cap of the fuel tank to add gasoline while the engine is running or still hot.
• Do not start the engine if there is some gasoline spread around, take the mower away from the one where gasoline have been split and avoid any contact from a hot source as long as the split gasoline is completely evaporated.
• Tighten the fuel tank cap and close tightly the jerry can cap.

Safety Symbols

Assembly

Unpacking
Remove lawn mower from carton and check thoroughly for additional loose parts.

Handle Setup
Open out the handle and screw the handles parts with the four screws and knobs. Put the recoil starter on the right of the handle and fix the cable with the plastic collar. Introduce the rope of the recoil starter handle on its support guide rope.

Handle Bar Height Adjustment (Pictures 2 and 2b)
If you want to adjust height of the handle bar, you can choose” L” or “H” two holes in left-right Bracket to fix the handle bar with screws and knobs.
The “H” hole is high position of the handle bar, and the “L” hole is low position of the handle bar.

Brake & Clutch Cable Setup (Picture C)
Insert the brake cable and clutch cable in to the hole of appropriate lever, see the illustration. The arrow indicates where the cable should loop through.

Panel Setup (Pictures D and D1)
Take out panel and two screws or bolts in a bag from carton, and fix the panel with screws. * Note: Different model have different panel. Not all models do have middle Panel.

Grass Bag Assembly (Pictures E and F)

•  Clip the plastic edges of the bag onto the frame and attach the clips as shown.
  The grass collector comes with a handy indicator showing whether the box is full of grass and needs emptying.

• Lift the rear discharge guard, remove the mulching plug, and install the grass bag.

Mulching plug (Picture G)
The mulching plug helps to curve the inside of the mower deck for more efficient mulching. Install and remove the mulching plug by raising the rear discharge guard as shown. The mulching plug only fits one way. Remove the mulching plug when using a grass bag.

Rear Discharge Guard Props (Picture H)
Take out two supports in a bag from carton, and lift the rear discharge guard, install the two supports which can hold the rear discharge guard, and this can make the grass out more efficiently from the deck.

Side Discharge Cover Assembly (Picture I)
Lift the side discharge guard, install the side discharge cover.
Only Mulching: please remove the side discharge cover.

• Note: Not all models do have side discharge guard

Before Operation

Engine Oil (Picture J)
The mower is shipped without oil in the engine.
All engines are run at the factory prior to packaging. Most of the oil is removed prior to shipment; however, some oil remains in the engine. The amount of oil left in the engine varies.
Add enough oil to bring the oil level between the upper and lower limit marks on the dipstick as shown. Do not overfill engine with oil

Fuel (Picture K)
Notice: Engine delivered without gasoline, refuel 1.0 litter of before starting the engine.

• Remove the filler cap
• Add fuel to the bottom of the fuel level limit in the neck of the fuel tank. Do not overfill. Wipe up spilled fuel before starting the engine.
• Tighten the fuel tank cap

Gasoline is extremely flammable, and gasoline vapour can explode, causing serious injury or death. Use extreme care when handling gasoline. Keep out of reach of children.
Refuel in a well-ventilated area with the engine stopped. Do not smoke or allow flames or sparks in the area where the engine is refueled or where gasoline
is stored. Avoid repeated or prolonged contact with skin or breathing of vapour.
After refueling, tighten the fuel tank cap securely. If any fuel was spilled, make sure the area is dry before starting the engine.

Charging the battery (Picture L)
Charge the battery before use Before the electric start function is used, the battery must be charged for 5 hours. Put the charger plug into the hole in the battery and connect the charger to a power supply.

• Note: Not all models have Electric Start Function.

Cutting Height Adjustment (Picture M and M1)
Check the cutting height settings, and make any necessary adjustments.
Warning! The blade can cause serious injury. Stop the engine before adjusting cutting height.

Operating Instructions
Starting The Engine (Picture N1-N7)

Primer
In cold condition, it’s necessary to push the primer button on the air filter before pulling the starter handle.

We also should put more fuel to mix air for easy start. When you push the primer button, it will pump the fuel direct from carburettor to burning house.

• Note: Not all models have this PRIMER.

  • Move the choke lever to the “CHOKE” position (Not equipped on all models).

• Note: Not all models have this choke lever.

  • Pull back on the brake lever and hold it against the handle.
  • Release the clutch lever. This will prevent the mower from moving forward when you operate the starter.

• Note: Not all models have this clutch lever.

  • If the models have electric start function, please press the E-starting button lightly, the engine will be started.

• Note: Not all models have Electric Start Function.

  • With the starter handle in its support, take the starter handle with your right hand and pull slowly as far as to have a resistance, then pull energetically on the starter handle with starter rope through the support (If the cold start is not sufficient enough, repeat this operation 2 or 3 times).
  • Immediately after the start, push back the choke lever from “CHOKE” position to “RUN” position (If the temperature is low, allow the engine to run for a few minutes before starting to work).

• Note: Not all models have this choke lever.

Operation The Controls for Mowing (Picture P1-P6)
Blade is in action as soon as engine started. While the machine is working maintain the security handle in working position. The engine will stop as soon as
you release the engine control bar.
Release the lever to stop the engine whenever you need to leave the mower.

Clutch Lever
Push the clutch lever forward and hold it against the handlebar to propel the mower forward.
Release the clutch lever to stop the mower’s forward movement.
Always release the clutch lever before starting the engine. If the clutch is engaged, the mower will move forward.
Operate the clutch lever with a quick and complete motion, so the clutch is either fully engaged or fully released. Hold the clutch lever against the handlebar
during self-propelled mowing. This will help to extend the service life of the clutch mechanism.

Throttle Lever
For best cut quality, always mow with the throttle lever in the “FAST” position. When the blade rotate at the preset fast speed, it creates a strong fan action that lifts and cuts grass more efficiently.

• Note: Not all models have this Throttle lever.

Variable speed Lever
Speed can be adjusted from 2.7 – 5.0 km/h while driving. Activate the right handle on the dashboard and set in one of the 4 different speeds. When driving in one the two lowest speeds the pace difference will not vary significantly.

• Note: Not all models have this Throttle lever.

Stop Engine
Move the throttle lever to the “SLOW” position.

• Note: Not all models have this Throttle lever.

  • Release the clutch lever.
  • Release the brake lever.

Warning! The blade will continue to rotate for a few seconds after the engine has stopped. Disconnect the spark plug cap if the lawnmower is to be left unattended.

Maintenance

IMPORTANT Regular, careful maintenance is essential for keeping the safety level and original performance of the machine unchanged in time.

• Keep all nuts, bolts and screws tight to be sure the equipment is in safe working condition. Regular maintenance is essential for safety and performance.
• Never store the equipment with fuel in the tank inside a building where vapour may reach a flame or a spark or a source of extreme heat.
• Allow the engine to cool before storing in an enclosed space.
• To reduce the fire hazard, keep the engine, exhaust silencer, battery compartment and fuel storage area free of grass, leaves, or excessive grease. Do not leave containers with grass cuttings in rooms.
• For reasons of safety, do not use the equipment with worn or damaged parts. Parts are to be replaced and not repaired. Use genuine spare parts (blades should always bear the symbol). Parts that are not of the same quality can damage the equipment and be dangerous for your safety.
• If the fuel tank has to be drained, this should be done outdoors and when the engine is cool.
• Wear strong work gloves when removing and reassembling the blade.
• Check the blade’s balance after sharpening.
• Check the self-closing guard and grass-catcher frequently for wear and deterioration.
• Whenever the machine is to be handled, transported or tilted you must:
  • Wear strong working gloves;
  • Grasp the machine at the points that offer a safe grip, taking account of the weight and its distribution.

Blade Inspection

• Tilt the mower to the right, so the air cleaner side is up. This will help to prevent fuel leakage and hard starting.

• Inspect the blade for damage, cracks and excessive rust or corrosion.
  A dull blade can be sharpened, but a blade that is excessively worn, bent, cracked, or otherwise damaged must be replaced.

• A torque wrench must always be used when installing the blade.
  Check that the blade bolts are tight.

Removal and installation (Picture Q)
If you remove the blade for sharpening or replacement, you will need a torque wrench for installation. Wear heavy gloves to protect your hands.

• Remove the bolt with a socket wrench. Use a wooden block to prevent the blade from turning when removing the bolt. Then remove the blade.
• Install the blade using the blade bolt and special washers. Be sure to install the special washers with the concave side toward the blade and the convex side toward the bolt.
• Tighten the blade bolt with a torque wrench. Use a wooden block to prevent the blade from turning when tightening the bolt.

Grass Bag Cleaning and Replacement (Picture R)

Cleaning
Wash the bag with a garden hose, and allow it to dry completely before use; a wet bag will clog quickly. Replacement

• Unclip the plastic edges of the bag from the frame, remove the bag from the upper cover.
• Insert the fabric bag into the upper cover, clip the plastic edges of the bag onto the frame.

Water Nozzle (Picture R2)

• The left side of the mower deck is fitted with a water nozzle for washing the deck.
• When using the water nozzle, the machine must be in the lowest height position and placed on the lawn. This ensures that the water remains under the  deck during cleaning.
• Attach a hose to the nozzle.
• Turn on the water and start the engine.
• The rotations of the blades will ensure that the water will clean the underside of the deck.
  Note: Not all models have water nozzle.

Engine Maintenance

Check Engine Oil Level (Picture J)
Check the engine oil level with the engine stopped and the mower.

• Remove the oil filler cap, and wipe the dipstick clean.
• Insert the dipstick into the oil filler neck, but do not screw it in.
• Check the oil level shown on the dipstick. If near the lower, fill to the upper level with the oil. Do not overfill.
• Screw in the filler cap securely.
  Notice: Running the engine with a low oil level will cause engine damage.

Change Engine Oil

• Drain the used oil while the engine is warm. Warm oil drains quickly and completely.
• Wipe the oil filler area clean, then remove the oil filler cap/dipstick.
•  Place a suitable container next to the mower to catch the used oil, then tilt the mower on its right side. The used oil will drain through the filler neck. Allow  the oil to drain completely.
• Please dispose of used motor oil and the containers in a manner that is compatible with the environment. We suggest you take it in a sealed container to your local recycling center or service station for reclamation. Do not throw it in the trash, pour it on the ground, or pour it down a drain.
• Fill with the recommended oil. Do not overfill. Allow a couple of minutes for the oil to settle down in the engine, then measure the oil level.
• Some models are equipped with an oil drain bolt; Untighten and remove the oil drain bolt and let the oil drain in the container. Make sure to tighten securely the drain bolt and add the sealing washer (if included before adding oil).

Air Cleaner Service (Picture T)
Notice: Operating the engine without an air cleaner, or with a damaged air cleaner, will allow dirt to enter the engine, causing rapid engine wear.

• Press down on the cover tabs and remove the cover.
• Remove the filter from the air cleaner base.
• Inspect the filter and foam element, and replace it if damaged.
• Clean the filter by tapping it several times on a hard surface to remove dirt, or blow compressed air through the air filter from the inside. Never try to brush off dirt; brushing will force dirt into the fibbers.
• Wipe dirt from the inside of the air cleaner base and cover, using a moist rag. Be careful to prevent dirt from entering the air duct that leads to the carbu- rettor.
• Reinstall the filter and cover.

Spark Plug Service (Picture U – U1 – U2)
For good performance, the spark plug must be properly gapped and free of deposits.

• Disconnect the spark plug cap and remove any dirt from around the spark plug area.
• Remove the spark plug with a spark plug wrench.
• Inspect the spark plug. Replace it if the electrodes are worn, or if the insulator is cracked or chipped.
• Measure the spark plug electrode gap with a suitable gauge. The gap should be 0.028 ~ 0.031 in (0.7 ~ 0.8mm). Correct the gap, if necessary, by carefully bending the side electrode with a suitable tool.
• Install the spark plug carefully, by hand, to avoid cross-threading.
• Install the spark plug cap on the spark plug.

NOTICE: A loose spark plug can overheat and damage the engine. Over tightening the spark plug can damage the threads in the cylinder head.

Cable Adjustment (Picture V)
Before the machine is being used, the cable adjustment should always be checked.
The cables can be checked by activating the handles fully and check if the cable is tight. If not, it must be tightened. If the handle cannot easily be fully activated, the cable should be loosened.
After first season, it must be expected that the cables need to be adjusted for optimal activation, as cables can stretch when used.

The following cables may be necessary to readjust:

1. Cable for drive
2. Cable for engine brake
3. Cable for throttle cable

Maintenance Schedule

REGULAR SERVICE PERIOD(4)| Before Each Use| First Month or

5 Hrs

| Every 3 Months or

25 Hrs

| Every 6 Months or 50 Hrs| Every Year or 100 Hrs| Every Two Years or 250 Hrs
---|---|---|---|---|---|---
ITEM
Perform at every indicated month or operating hour interval, whichever comes first.
Engine oil| Check| O| | | | |
Replace| | O| O(2)| | |
Air cleaner| Check| | O| | | |
Replace| | | O| | |
Spark plug| Check-adjust| | | | | O|
Replace| | | | | | O
Flywheel brake pad (A types)| Check| | | | | O|
Fuel tank and filter| Clean| | | O| | |
Fuel tube| Check| Every 2 years (Replace if necessary)
Valve clearance| Check-adjust| | | | | O|
Combustion chamber| Clean| After every 200 hours

Troubleshooting

ENGINE WILL NOT START| Possible Cause| Correction
---|---|---
1. Check fuel.| Out of fuel.| Refuel
Bad fuel; engine stored without treating or draining gasoline, of refueled with bad gasoline| Drain the fuel tank and carburetor. Refuel with fresh gasoline.
2. Remove and inspect spark plug.| Spark plug faulty, fouled, or improperly gapped.| Replace the spark plug.
Spark plug wet with fuel (flooded engine).| Dry and reinstall spark plug.
3. Take engine to an authorized our servicing dealer, or refer to shop manual.| Fuel filter clogged, carburetor malfunction, ignition malfunction,

valves stuck, etc.

| Replace or repair faulty components as necessary.
4. Push the prime button| In cold condition| Push the prime button.

cleaner elements
2. Check fuel| Bad fuel; engine stored without treating or draining gasoline, of refueled with bad gasoline.| Drain the fuel tank and carburetor. Refuel with fresh gasoline.
3. Take engine to an authorized our ser- vicing dealer, or refer to shop manual.| Fuel filter clogged, carburetor malfunction, ignition malfunction, valves stuck, etc.| Replace or repair faulty components as necessary.

Technical Data

propelled
Engine oil type:| SAE 10w-30 or SAE20w50| SAE 10w-30 or SAE 20w50| SAE 10w-30 or SAE 20w50| SAE 10w-30 or SAE 20w50| SAE 10w-30 or SAE 20w50*
Recommended fuel:| Unleaded gasoline 94

Octane or higher

| Unleaded gasoline 94

Octane or higher

| Unleaded gasoline 94

Octane or higher

| Unleaded gasoline 94

Octane or higher

| Unleaded gasoline 94

Octane or higher

Functions:| 3 in 1| 3 in 1| 3 in 1| 4 in 1| 4 in 1

• Choose the appropriate type depending on the local environmental temperature.

• The manufacturer reserves the right to make minor changes to product design and technical specifications without prior notice unless these changes significantly affect the performance and safety of the products. The parts described / illustrated in the pages of the manual that you hold in your hands may also concern other models of the manufacturer’s product line with similar features and may not be included in the product you just acquired.

• Please note that our equipment has not been designed for use in commercial, trade or industrial applications. Our warranty will be voided if the machine is used in commercial, trade or industrial businesses or for equivalent purposes.

• To ensure the safety and reliability of the product and the warranty validity, all repair, inspection, repair or replacement work, including maintenance and special adjustments, must only be carried out by technicians of the authorized service department of the manufacturer.

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