How to choose a lawn mower?
Answer: The choice of lawn mower depends on the lawn size, terrain, obstacles and how to deal with the cut grass. Lawn area exceeds 2000m2 or 3mu, please choose self-propelled mode to improve efficiency. If the terrain fluctuates greatly or has a slight slope, you can choose self-propelled. When there are flower beds, shrubs or hedges on the lawn, please choose the model with universal guide wheels on the front wheels. Grass collecting or broken grass covering in three-in-one cutter head is especially suitable for grass treatment;
-Side row is suitable for mowing grass evenly in a large area, and the labor intensity is lower than that of mowing grass.
-Grass-collecting function is used for fine pruning and places with high requirements for lawn quality.
How to choose the model of lawn mower correctly?
Pruning is one of the basic tasks of lawn maintenance. Choosing a suitable lawn mower is the premise to ensure the quality of lawn mowing. The type of lawn mower should be determined according to the function of lawn. The greens and tees of golf courses should be green trimmers and tee lawn trimmers. For fairway and playground lawn, such as football field and football field, it is best to choose hob mower or rotary mower. Ordinary green space, landscape lawn, etc. , choose rotary lawn trimmer; The slope of golf course adopts hanging lawn trimmer; Lawns in the forest or lawns with more obstacles can be mowed for irrigation.
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Problems needing attention in the use of lawn mower
First, a unit newly purchased a lawn mower, which started to run normally for the first time, stopped suddenly after 5 minutes, and then stopped every time it started. During maintenance, it was found that there was no fault in the machine, because the sealing cover of the oil tank was not removed, resulting in negative pressure in the oil tank, which caused poor oil supply and stopped the machine. After removing the sealing cover, the machine runs normally. This requires the seller to do a good job in sales service, which can avoid the above problems.
Two, a new unit to buy a lawn mower, start about 30 minutes after the sudden stop, the engine can not start. After maintenance and testing, all the mechanical indicators were normal. Finally, it was found that the fuel label was wrong, and everything was normal after changing the oil. When using the fuel purchased by the company, pay attention to the fuel label and use the correct fuel.
3. A unit newly bought a lawn mower, and after one day of use, it called to say that there was something wrong with the lawn mower and it could not be started. It turned out that the user changed it the next day without adding gasoline. Everything is normal after refueling. Users should train machine operators to ensure the correct use of the machine.
I got a call from a user, saying that the lawn mower I just bought is not powerful enough to mow the grass. It turned out that it was not a lawn mower, but the lawn grass they cut was more than half a meter high. Therefore, we must abide by the principle of one-third lawn mowing, otherwise it will have a great impact on the service life of lawn machine and lawn life, and will also affect the beauty of lawn.
Five, a new unit to buy a lawn mower, three days after the use of black smoke, lack of power. The reason is that there is too much oil, the oil level is too high, and the oil is sprayed from the breathing hole to soak the filter element, resulting in insufficient air intake. Only by replacing the filter element and controlling the fuel quantity can the mower work normally. Sales units are required to do a good job in sales explanation, and users should read the machine instructions carefully, use and maintain them correctly, so as to make the machine run normally.
6. A company bought a new lawn mower. It has just been used for less than a month, and the machine can't start. All the internal parts of the machine are seriously worn, such as crankshaft, piston and cylinder block. They all exceed the scrapping standard and have no maintenance value. It is found that the engine oil used is a fake and inferior product, and it contains a lot of metal chips and sand. It is required to use the engine oil with the label specified in the machine manual, and pay more attention to the purchase channels to avoid unnecessary economic losses.
Seven, a unit bought several lawn mowers, one of which was used, and it stuck after only one turn and could not be turned. Because the machine was bought and tested with engine oil, the mower fell down when it was packed and pulled back to the unit for storage, and the engine oil flowed into the cylinder. After the oil is discharged from the cylinder, the lawn mower can be used normally.
Eight, a unit bought three lawn mowers from the dealer, in the running-in process, three lawn mowers stopped one after another. After inspection, all three machines were caused by engine oil shortage and cylinder pulling. Distribution units have the obligation to train users in operation and maintenance so as to use and maintain lawn mowers correctly.
Nine, lawn mowing one-third principle
A unit bought a new lawn mower and called soon, reflecting the lack of power of the lawn mower and the difficulty in mowing. I didn't know until I arrived at the scene that the lawn grass had grown too high, which had exceeded the cutter head of the lawn machine. Therefore, lawn mowing should control the height of lawn grass within a certain range according to the specific use of lawn, and each mowing should follow the principle of one third: that is, the height of mowed lawn grass accounts for one third of the whole lawn grass height. This is not only beneficial to the regrowth of lawn grass, but also beneficial to the normal work of lawn trimmer.
Second, how to change the oil for the lawn machine?
Change the oil after the first operation of the new mower for 5 hours, and then change it every 30-50 hours.
When changing oil, you can drain oil from the oil pan drain hole at the lower part of the cutter head, or you can open the oil filler to the left (the air filter must be at the upper part). In any case, after the engine stops and the ignition lead of the spark plug is removed, clean the oil immediately, restore it, and add the appropriate engine oil to the specified scale again.
Note: The discharged waste engine oil should be properly kept and handed over to the waste oil recycler to avoid environmental pollution.
Third, how to clean the air filter of the lawn machine?
The foam screen should be cleaned every 25 hours, and the dust should be removed more frequently.
The foam filter element is cleaned with kerosene or washing liquid and clear water, squeezed dry, and then soaked in engine oil, and the excess engine oil can be squeezed out for installation. If it is printed "No oil", there is no need to refuel.
The paper filter is cleaned every 25 hours, more frequently when the dust is heavy.
Use the front air filter to clean the front filter element every 25 hours and the paper core every 100 hours. It should be more frequent when the dust is heavy.
The cleaning of the front air filter is the same as that of the foam filter.
Paper filters should be tapped on a flat surface. If it is very dirty, A should be replaced or cleaned in low or foam-free detergent and warm water solution; B. Rinse thoroughly with flowing water from inside to outside until the water becomes clean; Stand upright and air dry.
Note: petroleum solvents, such as kerosene, cannot be used to clean paper cores. Because it may lead to deterioration of the paper core, do not grease the paper core, and do not clean or blow dry the paper core with compressed air.
4. Why does the lawn mower use a big throttle when cutting grass?
When mowing grass, the rotary blade mower relies on the high-speed rotation of the blade to mow grass. If the linear speed of the knife tip is not enough, the mowing effect is not good. Therefore, when mowing the grass, you should use a large throttle and high speed. In addition, the carburetor and automatic speed regulating device of the lawn mower make it consume less fuel when the big throttle is empty, and only when it is loaded, its rotation speed will reach 2800 rpm from the empty 3400 rpm, so it is unnecessary to use the small throttle to save fuel, and the mowing effect is not good.
5. Why change the oil regularly?
The proper brand of lawn machine oil is used to lubricate, cool, clean and strengthen the piston seal. After the machine has been used for a period of time, with the dust and worn metal chips in the air entering the engine oil, the engine oil is heated and moves, and its performance will decline. If the oil is not changed in time, it will accelerate the wear and tear of the machine, shorten the service life of the machine, and even cause accidents such as bearing, cylinder pulling and connecting rod breaking. Therefore, the oil should be changed within a certain period according to the instructions to ensure the normal use of the machine.
6. Why should the air filter element of lawn mower be cleaned and replaced regularly?
The purpose of the empty filter element is to prevent dust from entering the cylinder body, so as to avoid premature wear of machine parts caused by dust entering the cylinder body. It should be cleaned frequently and replaced within a fixed period. When the machine is in use, dust will be deposited on the empty filter element, which will reduce the air intake and increase the combustion mixing ratio, resulting in incomplete combustion and reduced power. If the machine works like this for a long time, it will produce carbon deposit, which will aggravate the wear between pistons in the cylinder. If the carbon deposit falls in the cylinder block, it will cause cylinder pulling and machine power loss. Clean and replace the empty filter element in time to ensure the normal operation of the machine. At the same time, the outer wall of the cylinder should be cleaned frequently to ensure its heat dissipation effect. Otherwise, it will aggravate the machine wear.
7. Why do you find oil on the paper air filter after using the lawn mower?
Excessive oil addition is the main cause of the above failure. Because when the machine is running, the excess oil will be discharged from the crankcase through the breathing valve and breathing tube and sprayed on the air filter. This will cause the air filter to be scrapped.
8. What is the reason why the muffler of the engine emits black smoke?
The reason for the above failure is that the mixing ratio of intake air combustion is too deep. If this happens, try cleaning or updating the air filter first. If the fault is not eliminated, the carburetor of the engine needs to be adjusted or cleaned.
9. How to maintain lawn mower and lawn cart in winter?
When stored for more than 30 days:
First, drain the fuel in the fuel tank, and start the gasoline engine until it stops due to fuel exhaustion;
Secondly, in the state of just stopping the engine, drain the engine oil in the crankcase first, and then add new engine oil to the appropriate scale according to the recommended grade;
Third, take off the spark plug, drop 5- 10 ml of engine oil into the cylinder block, turn the crankshaft several times, and install the spark plug;
Fourthly, clean the dust and sundries around the cutter head, the machine body, the cylinder body, the radiator of the cylinder head, the air guide cover, the net cover and the muffler;
Fifth, save.
X why does the muffler emit blue smoke when the engine is running?
The above faults are caused by the participation of engine oil in combustion. After finding the fault, check the dipstick to see if there is any extra oil. If it is excessive, drain the excess oil and run for 10 minutes. If the fault is still not eliminated, the engine needs overhaul.
XI。 Why is it difficult to start the lawn mower?
The above failure is caused by stuffy oil in the combustion chamber. If you encounter this kind of fault, unscrew the spark plug and dry it (pay attention to prevent burns), then pull the starting rope a few times, and then put the spark plug back to start the engine.
12. What if the lawn mower can't cut the grass?
Remove the air filter and clean it. If it cannot be cleaned, please replace it. Check whether the blade is sharp. If it is dull, it needs polishing. In addition, whether there are thick leaves on the lawn, if there are, the size of mowing should be increased to reduce the load of the engine.
Thirteen. Why can't the lawn mower add too much oil during use?
The engine oil lubricates all parts of the machine in the cylinder, that is, the engine oil is continuously splashed by the engine oil splash wheel to clean, lubricate and cool all parts of the machine. Too much oil will cause a lot of emulsification and bubbles, and at the same time, it will not splash on the oil, which will not play a lubricating role and increase the temperature of the cylinder. So don't add too much oil to the lawn mower during use.
Fourteen. There are several reasons why it is difficult to start the lawn mower engine. What are the corresponding measures?
The difficulty in starting the engine is a complex problem, which should be considered from three aspects: oil, gas and electricity, because these conditions are very important for the engine to work.
First of all, the poor spark discharge effect of spark plug is one reason, so it is necessary to adjust the spark plug gap or replace it with a new spark plug; Secondly, the ignition vector caused by spur gear and magneto is inaccurate, so the engine needs to be disassembled and readjusted; Third, use gasoline that does not meet the specifications, or the gasoline is not pure. At this time, the gasoline must be replaced; Another possibility is that the air filter is blocked, which makes air intake difficult, so it is necessary to clean and replace the air filter in time.
Fifteen, how to judge the fault and maintenance of spark plugs?
The faults of spark cooling mainly occur in the skirt and electrode.
(1) Normal:
Normal means that the air-fuel ratio is appropriate, the ignition advance angle is appropriate, the spark temperature value is appropriate, and the combustion chamber is normal. That is, there is no hot spot fire, no leakage and fire failure. In general, spark plugs have almost no carbon deposit and are dry. The electrode is basically non-ablative, and the surface is light brown (rust color) or grayish powder. As long as some trace deposition residues are wiped off during maintenance, they can be used continuously.
(2) Carbon deposition and scaling
The carbon spark plug is dry and has a dark black carbon layer deposited. In severe cases, the carbon layer is tubular. Carbon deposition can lead to leakage and fire extinguishing. Too high concentration of combustible gas, too high calorific value of spark plug, weak ignition or too large electrode gap will all cause carbon deposition. The spark plug can still be used after the carbon layer is removed.
(3) Overheating damage
The skirt is white or light gray when it is dry. In severe cases, there are local loose protrusions on the surface of the porcelain tube. The electrode is obviously ablated, and there is a circle of ablation at the proximal end of the central electrode with tumor-like particle adhesion. Too thin combustible gas, low calorific value or air leakage of spark plug, premature ignition or overheating of gasoline engine will all cause overheating and burning loss. It is better to update.
(4) Oil pollution
Engine oil, bright, black and wet. Too much oil in mixed oil, oil leakage from crankshaft oil seal, low calorific value of spark plug, and long idle or low-speed running time will all cause oil scale. If there is no special cleaning solution, it is difficult to remove it. The spark plug electrode gap is an important technical data, which should be adjusted according to the instruction value. Contactless ignition is generally 0.6-0.7 mm The gap is too large, and the high-speed performance of gasoline engine is not good; Too small, low speed performance is not good.
Sixteen, how to correctly choose the oil label?
The choice of engine oil grade is determined according to the working temperature of the engine. Most engines used in lawn machines are air-cooled gasoline engines, and the working temperature of air-cooled gasoline engines is relatively high, so the selected label should conform to the temperature range of 40. Oil with viscosity grade above F, such as SAE30 oil. If you use 40. Oil with viscosity lower than F will increase oil consumption and may damage the engine. If you use this oil, you should check the oil level more frequently.
17. What are the unfavorable results of wetland mowing?
Don't mow the lawn grass when there is water, otherwise it will infect the leaves of the lawn grass and affect weeding or harvesting; It may also cause the staff to slip. If a lot of soil is attached to the grass leaves after pruning in spring, the soil will attach to the cutter head, and the soil will wear the end of the blade when it is bound to a certain extent. Therefore, mowing the lawn is not allowed when there is water, and it must be done dry.
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1. What should I pay attention to when using the hedge trimmer?
Hedgehog machine is a two-stroke power, so attention should be paid to power, transmission and cutter in use to ensure the normal use of the machine:
1, engine:
A, qualified gasoline and engine oil, ensure its mixing ratio (25:1);
B, regularly check and replace the air filter (25 hours) and check the spark plug;
C, rest after each tank of oil 10 minute, and clean the loose gasket of the machine after each work to ensure heat dissipation;
D, storage, must clean up the body, put off the mixed fuel, burn out the fuel in the carburetor; Remove the spark plug, add 1-2ml two-stroke engine oil into the cylinder, pull the starter for 2-3 times, and install the spark plug.
2. Transmission: lubricate regularly (25 hours)
3. Cutter: Check the gap between the upper and lower edges regularly (25 hours) and adjust it in time (the interval is half a turn of bolt thread) to keep the blade sharp. Oil the blades every working hour, and the trimming diameter is < = 10 mm.
Second, what should I pay attention to when using the brush cutter?
The brush cutter is a two-stroke power, so attention should be paid to the power, purpose and cutter in use to ensure the normal use of the machine:
1, engine:
A, qualified gasoline and engine oil, ensure its mixing ratio (25:1);
B, regularly check and replace the air filter (25 hours) and check the spark plug;
C, rest after each tank of oil 10 minute, and clean the loose gasket of the machine after each work to ensure heat dissipation;
D, storage, must clean up the body, put off the mixed fuel, burn out the fuel in the carburetor; Remove the spark plug, add 1-2ml two-stroke engine oil into the cylinder, pull the starter for 2-3 times, and install the spark plug.
2. Transmission: Grease the gearbox regularly (25 hours), and at the same time, grease the joint between the upper part of the transmission shaft and the clutch plate.
3. Cutter: the length of nylon cable head should be controlled < = 15 cm. When using the blade, the blade should be balanced, and never use the vibrating blade.
Two-stroke mechanical fuel mixing ratio?
Generally, two-stroke mechanical fuel is mixed steam engine oil (engine oil is special engine oil for two-stroke engines). The ratio of steam engine oil is about 25: 1, depending on the usage. If it is not running at high speed for a long time, the concentration can be appropriately increased. If it runs at a high speed all the time during use, the concentration should be appropriately reduced and more oil should be drained to ensure the normal lubrication of the running parts inside the cylinder, but attention should be paid to removing them in time.
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