How To Remove The Head From The Stihl Trimmer
When clutch replacement is required
Chainsaw clutches are removed and replaced in the event of a mechanism failure. The following faults include:
- Spring damage. Depending on the model of the tool, the spring can be presented in two types. Coil (tape or single) or steel sheet. The spring is damaged by tension, separation, or mechanical defect. To determine the cause of the failure of the entire mechanism, you will need to remove the protective cover and drum
- Drum damage and fabrication. Failure of this part is often related to the parts, because K. In the event of such a malfunction, you will need to replace the drum. The inner part also wears out on the drum, so it needs to be replaced as well. If the drum is blue, it means that it is overheated and should not be used anymore.
- Development mechanism. This is primarily due to the extension of the spring, which can be replaced. The threaded connection also wears out. With such a breakdown, it is necessary to replace the entire clutch.
- Star clothes. Depending on the type of chainring (folding or folding), it is replaced by a drum and, if necessary, a clutch
The service life of the clutch mechanism depends not only on the quality of the parts, but also on the correct operation of the tool. To extend the service life of the chainsaw clutch, you should pay attention to signs that reduce the resource. The following features include:
- Frequent wedging or biting of the chain in the forest. In these situations, the clutch absorbs the entire load, protecting the engine from seizure.
- It is forbidden to increase the speed when the parking brake is on, which also leads to wear of the mechanism due to overheating.
- Using the wrong oil, choosing the wrong tires, chains, and more. All this also affects traction, increasing the load and therefore shortening the service life.
It is quite easy to determine if the device is faulty. To do this, you need to cut off the workpiece. If the chain speed decreases during sawing or stops when the load increases, then it’s time to check the grip. How to remove and replace the clutch on a chainsaw, we will discuss in detail in the next section.
Clutch repair. Replacing the spring
Do not rush to change the entire mechanism, as the clutch malfunction can be eliminated by replacing the defective part. The most common cause of a malfunction is a stretched spring that can be damaged. The extended spring is already defective. If the spring is damaged, it can be replaced to repair the tool. Replacement instructions depend on the design of the machine, as compressor devices are of different types, but they all need to be replaced. This procedure is not so difficult as it requires special care and consistency. How to replace the spring with a chainsaw clutch is shown in detail in.
If the friction pad is damaged, this part can also be replaced. Replacement of the part is also necessary in case of wear of the threaded connection, which occurs with frequent removal and installation of the coupling in place. In order to understand the cause of a component failure, a visual inspection must first be carried out. If the sprocket teeth are worn out, they should be replaced. Fixed stars must be replaced by a drum.
How to remove the clutch on a Stihl trimmer
What does it mean to adjust the clutch of a chainsaw and how to control it
If you’ve heard that the clutch on a chainsaw needs to be adjusted, then the question is probably how to do it? The chainsaw does not need to be adjusted on the chainsaw, because it works in an automatic mode, unlike the devices of old brands of tools. The compression force of the spring or spring cannot be adjusted, and if this part is damaged it must be replaced.
Replacing the clutch with a chainsaw on site, also does not need to be adjusted. The clutch is tightened with a special wrench and a locked piston in the cylinder. On some models, chainsaws have a washer or spacer. This can be between the shaft and the sprocket, or the drum and the sprocket. This washer adjusts the sprocket alignment with the tire. If there is such a washer on the chainsaw, then it should be replaced at the place of repair or replacement of the mechanism.
How to remove and adjust the clutch mechanism on the Ural and Druzhba chainsaws is shown in detail in.
It should be noted that the grip on a chainsaw plays an important role. This mechanism not only ensures the transfer of torque from the motor to the circuit, but also protects the motor from premature failure. Imagine when the sprocket is rigidly connected to the crankshaft. When the chain engages in the cut, engine parts, sprockets and chains wear out at the same time. Understanding the purpose and principle of operation of the mechanism, you must always monitor its serviceability and, at the first signs of failure, carry out its removal, repair or even replacement.
My string trimmer keeps turning while idle
The string trimmer uses the same clutch mechanism as the chainsaw to prevent the tool from rotating when the engine is idling. If the clutch does not work properly and the string does not stop rotating, the tool can be dangerous. It can damage something or even cause injury. The engine may idle too quickly. Which is easy to fix. Or the clutch may need service.
The trimmer clutch is usually easily accessible. You remove the shaft-to-engine bolts, remove the shaft, and unscrew the clutch cover. If the springs are worn, you may be able to get the trimmer working by replacing them, but metal cracks and surface wear are not easy to fix and usually require replacing the entire clutch assembly. On most models, removing the clutch from the crankshaft is a simple task, including removing one or two screws or a lock nut. Replaceable clutches are available and inexpensive.
A clutch can fail in two different ways. In one case, the friction coating on the shoes wears out, they slide over the drum, and the string head rotates intermittently or does not rotate at all. This can also happen if oil gets into the clutch and gets dirty. In the second scenario, the shoes are never retracted and are always in contact with the drum. A broken spring is usually the cause of this type of malfunction, but can also be the result of corrosion. If the spring is broken, it can sometimes be replaced, but it is usually easier to replace the entire clutch.
The design and principle of operation of the chainsaw clutch mechanism
Most saws do not understand how the chainsaw clutch works. At work, you do not need to know the principle of operation, but in case of malfunctions, to eliminate them, you will need to find out the design and features of the chainsaw clutch.
Modern chainsaws are equipped with centrifugal clutch mechanisms. Centrifugal clutch. This means that its performance depends on the engine torque. The main purpose of the clutch on a chainsaw is to ensure the transmission of torque from the engine crankshaft to the saw chain. The device works in automatic mode, and how this happens, we will find out in detail.
The clutch mechanism consists of the following structural elements:
- Removable or fixed star drum. This is a gear
- Friction linings. Under the action of centrifugal force, they move, mating with the drum
- Spring. Provides crankshaft pressure
Now about the principle of the chainsaw clutch. When the tool’s two-stroke engine starts, the crankshaft starts to rotate. The shaft is attached to the shaft to which the chain is connected by a sprocket. When the chainsaw is idling (shaft speed up to 2700 rpm), that is, the accelerator trigger does not stretch, the spring presses on the friction pad, as a result of which torque is not transmitted to the drum.
As soon as the dust collector picks up the tool and starts to increase the speed (up to a maximum of 14000 rpm), the chain starts moving on the tire. This is due to the increase in crankshaft rotation speed. The force of inertia causes the friction pads (also called counterweights) to move and contact the inner walls of the drum. The result is a sprocket-linked drum. The spinning star leads the chain.
The principle of operation of the mechanism is simple, due to its simple design. If this part breaks down, the chainsaw will not work properly. A detailed description of the operation of the chainsaw clutch mechanism is described in this material.
How to remove the trimmer sleeve from most line / string trimmers
If you need to repair or replace the clutch on your trimmer, you can follow the instructions step by step in the best way. Disassemble the trimmer so that the clutch can be reached. A tip is provided to remove these tricky clutch drum screws as sometimes you may not be able to remove some parts as easily as they look.
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 stud.
- Remove the locking hex key.
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 a 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 changed in the lawn (garden) trimmer.
How to change nylon line on 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 that actually indicate the lugs. In these places of the lid body, it is necessary to 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.
Winding nylon line onto the spool of the head
At the next stage of the operation, grasp the coil of the lawn trimmer head with the palm of your left hand, holding it in the position as shown in the picture below. With your other hand, put a loop of nylon line over the protrusion of the center edge that divides 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 (mount)
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 pass the remaining 150 mm ends of the nylon line into the spindle grooves specially provided for this purpose. 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 the remaining 150 mm ends of the nylon line into special grooves of the spindle; 2. installation of previously removed elements on the coil
This completes the replacement of the line in the trimmer, 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.
Assembling the head for a lawn hedge trimmer
Machines for treating lawns and other territories, along with impact heads, are supplied complete with brush cutters, which are actually circular metal saws. Usually brush cutters 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 washer; 3. ring cutter clamping cup; 4. lock nut; 5. clamping hex key
The installation does not require any special work. It is enough to put the selected saw, the alignment washer and the annular cup on the axle, 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).
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 2.5mm),
- Stock nylon line (usually 2.5. 3 meters),
- Steel cutter brushcutter 3 teeth and 8 teeth.
Additionally, a set for a lawn (garden) trimmer, 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,
- Protective face shield,
- Anti-noise headphones,
- Set of working tools,
- Spare spark plugs,
- Oil mixing container.
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 changing the line on the trimmer in the impact head.
Lawn trimmer (garden): how to remove the head replace the line install a brush cutter
A household tool, which is a lawn (garden) trimmer, is marked in practice by its active use. Technically, this type of machine is considered a very familiar device. Traditionally, brush cutters and string grass mowers have been 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.
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 container 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).