Do-it-yourself troubleshooting
In order to repair the magneto with your own hands without involving specialists, you need to know how to disassemble it, and how to change the breaker contacts to new ones.
Disassembling magneto
Disassembling the magneto is very simple. First, remove this device from the engine and clean it, removing oil particles and dirt. Further, since the ignition timing machine is securely fastened, you need to Unscrew the nut, and then remove the part and pull the key out of the groove. The cover is fixed with four screws, to remove it, you need to Unscrew and remove the fasteners. Then you need to pull the magneto rotor out of the case, unscrew the pins holding the transformer and get it out. And to collect the magneto, you need to follow the steps described above in reverse order.
No sparking
If the Spark does NOT give out magneto at all, the main reason is an open circuit in one of the transformer circuits (primary or secondary). The defective part must be replaced to repair the mower. If the primary circuit is shorted to ground, it can also cause no spark. You need to fix it to fix the problem.
Replacing the magneto
To remove the magneto, remove the plastic cover from the trimmer. This process is different on different mower models. It is usually necessary to unscrew the bolts, but on some trimmers it may be necessary to release the latches. After that, access to the coil opens. To remove the part, you need to Unscrew the retaining fasteners and disconnect the wires.
When installing a new part, you need to correctly set the distance between the flywheel and the magneto. To do this, return the flywheel with magnets up, install the coil and secure it, but DO NOT fully tighten the screws so that there is a small distance between the parts. Next, between the coil and the flywheel, you need to put a calendar, business card or A4 paper folded in four, you can also use a plastic strip cut from a bottle. These tweaks will ensure adequate clearance between the flywheel and the magneto. A more competent solution would be to use a special template, but purchasing it for the sake of just one time is impractical. Next, you need to tighten the fasteners, remove the object between the parts, and, holding the magneto with your hands so that it does NOT spin, tighten the fixing screws tightly. After that, turn the flywheel and make sure that it does NOT hit the coil anywhere. Now you need to connect the wires and insert the candle into the cap, and then check the operation of the device.
Replacing breaker contacts
After disassembling the magneto, it is necessary to remove the old breaker contacts and install the new ones correctly. To do this, you must:
- Move the latch, remove the cover from the breaker;
- Unscrew the screw holding the connecting wire;
- Remove the screw securing the breaker plate to the magneto cover and remove it;
- Get the screw securing the breaker spring;
- Remove the lock washer from the axle, and then the lever with the cushion assembly, which it holds;
- Unscrew the screw securing the contact post, remove the part from the wasp.
Assemble the assembly with new contacts in the reverse order.
Functional check
Before starting to diagnose magneto, you need to make sure that the problem is actually in this node. To do this, you need to check the entire chain and make sure that there are no other reasons for the breakage of the trimmer.
- First, you should carefully inspect the coil for cracks and other external defects on the case. Next, you need to study all the elements and nodes that conduct current, and make sure that they are clean.
- The next step is to inspect the high voltage wires. They must be in good working order and securely attached to the contacts, free from rust and with intact insulation.
- The next step is to check the spark plug cap. As a result of careless actions of users, he often tears it off the high-voltage wire, and then improvises and creates a homemade mount. You need to understand that any poor-quality connection in this place significantly reduces the power of the electric arc of the candle.
- Then you should make sure that the candle itself is working properly. Filling the mower with poor quality gasoline will significantly reduce the life of this part. In addition, it can be flooded or have a large carbon deposit that interferes with operation. Sometimes the candle even sticks and does NOT unscrew.
- Next, you need to inspect the circuit breaker. On trimmers and chainsaws made in China, it often breaks.
After completing all these steps and excluding the listed nodes from the list of possible causes of failure, you should proceed to check the coil. This can be done in several ways.
Unstable sparking
If the spark is intermittent with the magneto, you must first check the contacts. They could be burnt or oily. The carbon deposits found are cleaned with a file, and the oil is wiped off with suede, previously soaked in gasoline. The second possible cause of the problem is the adjustment of the gap between the contacts. To eliminate it, you need to set the correct distance.
If the spark appears intermittently, it could also mean that the breaker arm pad is wearing. To eliminate the malfunction, you must change the lever to a new one. In addition, the clearance should be adjusted, as with another possible cause of breakdown. misalignment of the outline.
Capacitor breakdowns can also be the culprit for interruptions in spark formation. In such a situation, replacement of the damaged part is required, since it is impossible to repair and recharge it.
Insufficient sparking
A weak spark on the magneto is caused by a damaged capacitor. To eliminate the damage, it is necessary to replace the failed part.
Method 1
The first method, by which the ignition coil is checked, involves the use of special equipment (stand). At home, it is not available. you can find it only in service centers.
How to change nylon line for a trimmer?
To fill the impact head of the lawn trimmer with nylon line for cutting grass, the impact head must first be removed from the drive shaft and disassembled.
The disassembly process is simple. There are visible grooves on the head body, actually indicating the lugs. In THESE places of the lid body, create a slight pressure while pulling the lid.
The operation of disassembling the module case, where the nylon line is inserted, which acts as a cutting tool of the trimmer in the mode of cutting grass lawns
To insert new nylon line into the trimmer, you will need approximately 3 meters of material in each groove (6 meters in total) of the dedicated plastic spool. First, the coil is removed from the spindle together with the spring and washer. Remains of previously loaded nylon line from the spool must be removed.
Next, take a previously purchased nylon line (diameter 2.5 mm), unwind 6 meters of product, cut off a measured piece. Fold the resulting trimmer line in half. The end of the nylon line forms a kind of loop at the half fold.
Lawn trimmer (garden): how to remove the head replace the line install the brush cutter
The tool for household purposes, which the Lawn (garden) trimmer is, is marked in practice by its active use. Technically, this type of machine is considered a very familiar device. Traditionally, trimmers Brush cutters and string mowers are based on a standard combustion engine system. True, electric models are increasingly appearing on the market. However, consider the first option in terms of maintenance.
Lawn Trimmer (Garden). Maintenance
Regardless of the type of drive of the automated scythe, the cutting part of such a device is usually represented by the common design of the trimmer head. In general, the equipment can contain the following units and blocks as part of the structure:
- Main unit (petrol or electric drive),
- Operator handle,
- Trimmer head,
- Head with nylon cutting line (diameter 2.5 mm),
- Stock of nylon line (usually 2.5. 3 meters),
- Steel cutter brush cutter 3 teeth and 8 teeth.
Additionally, a set for a lawn trimmer (garden), as a rule, includes working accessories. It also includes the necessary tools, as well as other components, the use of which requires operation and maintenance operations:
- Safety belt,
- Gloves,
- Face shield,
- Anti-noise headphones,
- Set of working tools,
- Spare spark plugs,
- Container for mixing oil.
When using a string trimmer for lawn or other, the engine will need to be refueled periodically. In addition, in the process of doing household work. trimming grass and bushes, it may be necessary to change the working head of the hedge trimmer. Or replacing the line with a trimmer in the striking head.
How to install and remove the string trimmer head?
A few simple steps are required to install the nylon line trimmer impact head (for cutting grass).
- Unscrew the shaft stud locking nut (clockwise),
- Remove the cup and clamping plate held by the nut.
- Lock the shaft with the hex key (included).
- Thread (counterclockwise) the nylon line trimmer head onto the shaft pin.
- Remove blocking hex wrench.
The removed nut and clamping washer must be kept in a safe place, as these parts are not used if the impact head with line is installed on the Lawn (garden) trimmer. However, these parts are needed to fasten cutters intended for cutting bushes.
The sequence of installation. removal of the impact head with nylon line for cutting grass in household areas on a string trimmer
Accordingly, the removal of the working impact head of the trimmer with nylon line for lawn grass removal is performed in the reverse order.
The described operation of installing and removing the impact head of the trimmer with nylon line, in fact, requires consideration of another maintenance operation, due to which the line is replaced in the Lawn (garden) Mirrors.
Assembling the head for a trimmer for a brush cutter Lawn
Machines for treating lawns and other areas, along with impact heads, are supplied with hedgecutters, which are actually circular metal saws. Usually Brushcutters with 3, 8 or more cutting teeth are used.
To install a brush cutter for work, you will again need to remove the head of the scythe. Then the required tool with 3, 8 or more teeth is selected from the set. Brush cutter discs are usually protected by a plastic guard in the blade area. The cover must be removed, after which the brush cutter disk is installed in place.
The sequence of installation of the brush cutter: 1. installation of the saw on the axle; 2. leveling club; 3. circular cutter clamping cup; 4. lock nut; 5. clamping hex key
The installation does not require any special work. It is enough to put on the selected dust, an equalizing washer and an annular cup, and then screw and tighten the lock nut.
Tightening the nut requires securing the drive shaft (discussed above) and using a hex wrench (included), which is also used to replace the motor plug. Generally, the nut is tightened counterclockwise (on most models).
Winding nylon line onto the spool of the head
In the next step of the operation, the coil of the lawn trimmer head should be wrapped around the palm of the left hand, holding it in the position shown in the picture below. With the other hand, a loop of nylon line is thrown over the protrusion of the central edge, dividing the winding area of the reel into two sectors.
Laying nylon line in the trimmer, more precisely in the sectors of the reel. Loop version of material stop before winding. Some lawn (garden) trimmers have other options for the stop (attachment)
Wind both halves of nylon line evenly and firmly counterclockwise (or in the direction of the arrow marked on the spool body). Stretching. it is necessary to wind the slings without twisting one slings on the other. Winding ends when the remaining ends of the nylon line are approximately 150 mm long.
Then insert the spool back into the spindle and thread the remaining 150mm ends of the nylon line into the spindle grooves specifically provided for THESE purposes. Next, the spindle part of the assembly is pressed into the palm of the left hand and on the opposite side of the coil, the washer and the spring previously removed are installed in place.
Assembly process. installation of the wound coil: 1. release of the remaining 150 mm ends of the nylon line into the special grooves of the spindle; 2. installation of previously removed elements on the coil
This completes the replacement of the fishing line in the trimmers, The assembled module is installed on the drive part, as discussed above in the text. Meanwhile, many models of lawn (garden) trimmers are also supplied with brush cutters, the use of which also requires installation procedures.
How to properly fuel the trimmer motor?
The automated garden scythe promises good durability when used correctly, including refueling. A gasoline engine of such a device is not allowed to operate on pure gasoline. Before refueling, you need to prepare a working mixture of fuel. namely, mix unleaded gasoline with engine oil.
The working fuel tank included in the kit, as a rule, has marks on the body for the correct mixture: 1. level of unleaded gasoline; 2. engine oil levels depending on the ratio
Mixing unleaded gasoline with engine oil is required in the correct ratio. Therefore, many manufacturers of string and other gasoline trimmers mark the working containers.
The user will only have to fill the mixing tank with fresh unleaded gasoline in accordance with the fuel marker line. Then machine oil is added until the fuel mixture reaches the 40: 1 ratio mark (optimal for two-stroke engines).