Replacing the Fuel Hose on a Husqvarna Chainsaw
Despite the presence of service centers for maintenance and repair of gasoline powered tools, many owners of chainsaws prefer to repair them on their own. Starting an independent repair, you need to know what the chainsaw consists of, how to diagnose malfunctions and have a set of tools that you may need to carry out repairs.
In this article, we will analyze how to conduct an independent repair of a Husqvarna chainsaw and what is needed for this.
What you need to repair Huskvarna with your own hands
- Piston stop. Necessary to limit the stroke of the piston through the spark plug hole. It is used to unscrew the flywheel nut and clutch (if necessary, it can be replaced with a cord from the starter with knots imposed on it);
- Adjusting screwdriver. On some Husqvarna chainsaw models, the carburetor adjusting screws are in the form of an asterisk or a semicircle;
- Clutch key. Depending on the model of the chainsaw, different types of keys can be used (can be made from an old head of a suitable size, turning it to the desired size);
Tip: When repairing any petrol tools, it is convenient to use a medical clamp and tweezers. You will also need a set of heads, a slotted screwdriver, and a set of Torx wrenches.
Husqvarna saw disassembly algorithm
The process of disassembling a Husqvarna chainsaw is quite simple. In order to do everything correctly and not to break the details of the case or the CPG, it is necessary to disassemble in the following order:
- Top cover.
- Chain brake cover and saw set.
- Flywheel and clutch.
- Front handle
- Oil pump.
Depending on the Husqvarna model, the disassembly order may vary slightly.
Important: before proceeding with disassembling the chainsaw, it is necessary to clean it. When working with a saw, a lot of chips and wood dust are formed, which, when disassembled, can get into the internal parts of the Husqvarna chainsaw.
Removing the side cover and saw set
The side cover or also called the chain brake cover is held by two thirteen nuts.
Unscrewing the nuts, the cover is removed from the guide pins, after which you can remove the tire and chain from the chainsaw. In some models of Husqvarna saws, a special mechanism is installed that allows you to dismantle the cover and the saw set without the help of special tools.
The starter is located on the right side of Husqvarna and is held on several screws. Having unwound which, it is possible to easily remove the starter and thereby gain access to the flywheel and the ignition coil.
Flywheel and clutch removal
In order to unscrew the flywheel nut, it is necessary to unscrew the spark plug and install the piston stopper instead.
If you do not have a special stopper, then you can use the old lace from the chainsaw starter instead. On the lace, it is necessary to impose nodules at a distance of 2-3 cm, after which, using a screwdriver, insert it through the candle hole into the cylinder. The lace will limit the piston stroke, thereby preventing crankshaft from turning and protect the piston from damage.
Once the piston stop is installed in the cylinder, the flywheel nut can be untwisted. The field as the nut is untwisted, it is necessary with a hammer and a drift of soft material, apply one sharp blow by installing a drift on the flywheel mounting shaft. This is necessary for dismantling the flywheel from the shaft, because the design provides for the installation and tightening of this element with great effort.
To learn more about how to properly remove the flywheel from the Husqvarna chainsaw, as well as how to completely disassemble the saw, you can watch the. The wizard explains the whole process step by step and demonstrates all the necessary tools:
In order to unwind the clutch, you need a special key. If there is no key, then it can be made from an old head for twenty-two, turning it in a certain way with emery.
The clutch has a left-hand thread and is untwisted clockwise.
Do not try to unscrew the clutch with a hammer and chisel, as some craftsmen advise. Using these tools, you risk breaking the clutch housing and increasing the cost of repairs. It can also damage the crankshaft bearings.
Removing the front handle of Huskvarna is quite simple, because it is attached to the shock absorbers with screws.
Air filter and carburetor
To remove the carburetor, it is necessary to disconnect the fuel hose and traction dampers from it, to do this conveniently after removing the air filter, which is installed immediately after the carburetor and held with two nuts at 10. After the air filter is removed, and the fuel hose and the rods are disconnected, just pull the carburetor towards you and remove it from the studs.
Use tweezers and medical clamps to remove the carburetor.
At Husqvarna, an oil pump is installed on the right side of the chainsaw. It can be removed only after the clutch has been untwisted. To remove, you do not need a special tool, because fastening screws are made for a conventional Phillips screwdriver. After the screws are unscrewed, it is necessary to raise the pump and disconnect the oiled hoses from it.
To remove the engine on a Husqvarna chainsaw, after the carburetor, clutch, flywheel and muffler are removed, you will need to unscrew the four screws that secure it to the body.
After the engine is removed, it is possible to unscrew the ignition coil from it, without forgetting to first disconnect the wires going from it to the ignition switch. The coil can also be removed immediately after the starter is removed.
Husqvarna chainsaw assembly must be carried out in the reverse order; tighten the flywheel nut and the clutch must be tightened with the force specified in the chainsaw instruction manual.
How and when to adjust the ignition on a Husqvarna saw
For users of Husqvarna chainsaws, the question often arises: how and when to adjust the ignition. The answer is simple. Husqvarna chainsaws have an electronic ignition coil and a flywheel, which do not provide for adjustment. The only thing that can be adjusted is the gap between the coil and the flywheel.
To adjust the clearance at home, it is necessary to cut the probe from a plastic bottle, and then loosen the screws that secure the coil. Further, the probe is installed between the contacts of the coil and the flywheel. The screws are tightened.
It is necessary to adjust the clearance when performing maintenance or when scoring is detected on the surface of the flywheel. Such seizures indicate that the gap is completely absent.
If after the gap between the coil and the flywheel is set, and the parts continue to be in contact, it is necessary to check the bearings of the crankshaft for wear. Perhaps they are very worn out and require replacement.
Basic faults and solutions
When starting to repair a chainsaw, you need to have an idea of what kind of malfunctions it may have, as well as how these malfunctions are eliminated. So, let’s look at the signs of malfunctions and how to solve them.
Husqvarna chainsaw won’t start
If Husqvarna does not start, the first thing you need to make sure is your adherence to the saw launch algorithm, as well as the presence of fuel in the tank. Detailed instructions on how to start up a cold chainsaw and refuel it can be found in the saw manual, which comes with all Husqvarna chainsaws.
In the event that you are doing everything right, but the saw does not respond, the reason may be hiding in a malfunction of the ignition system or a lack of fuel supply.
To more accurately determine the causes of this behavior of the chainsaw, it is necessary to inspect the spark plug, and then check it for a spark.
If the candle is wet, and when checking the spark it was not found, it is worth trying to replace the candle itself. Replacement did not give results, which means that the problem may be hidden in the ignition coil, which is difficult to verify on its own.
You can check the serviceability of the coil by installing it on a previously serviceable saw of a similar model or by replacing the part with a serviceable one.
In the event that there is a spark, and the candle is dry. Problems in the fuel system. To eliminate it, you need to conduct its full diagnosis. The fuel system consists of a carburetor and a fuel line. Having no specific experience, you can check the fuel line for gusts, as well as the cleanliness of the fuel filter installed in the tank. Complete diagnostics and carburetor repair is best left to professionals.
If the saw starts, but it’s bad
The cause of the difficulty in starting the saw may be a malfunction or improper adjustment of the carburetor. In the case when the carburetor overfills, the chainsaw will be easy to start on hot, but quite difficult to cold, especially after a long period of inactivity.
An indirect sign of an excessive amount of fuel mixture entering the cylinder during operation of the chainsaw is the exhaust. If a lot of white smoke is emitted during the operation of the chainsaw, it is worth checking the proportions of the fuel mixture preparation and carburetor adjustment.
Chainsaw chain idling
If the Husqvarna chain rotates at idle, then we can conclude that there are malfunctions in the clutch mechanism or the idle is not adjusted. To eliminate the malfunction, it is necessary to remove the brake cover of the saw chain and inspect the integrity of the clutch spring. Defective coupling replace.
If the clutch is working properly, to eliminate the scrolling of the chain, it is necessary to adjust the idle speed using the adjusting screw indicated by the letter (T) or carry out a full carburetor adjustment.
Important: a possible reason for an independent increase in idling is the appearance of air leakage in the engine crankcase or carburetor, which can lead to serious damage to the CPG.
Why the Husqvarna chainsaw stalls when you press the gas
If the saw dies immediately after pressing the gas, it is necessary to inspect the spark plug, which will help to more accurately diagnose the malfunction. A wet candle indicates a malfunction or improper adjustment of the carburetor, in this case, you can correct the situation by conducting a complete diagnosis, repair and adjustment of this unit. If repairs and adjustments do not help, replace the carburetor with a new one.
Another reason that Husqvarna can stall when you press the gas is a malfunction in the fuel system, or rather, difficulties in supplying fuel to the carburetor. Check the cleanliness of the fuel filter as well as the integrity of the fuel hoses.
During the assembly of the chainsaw during its complete repair, you can squeeze the fuel hose coming from the tank to the carburetor, which will limit or completely stop the flow of fuel and make the saw impossible.
Why the chain on the Husqvarna chainsaw is not lubricated
If the chain lubrication is completely stopped on your chainsaw, then the entire oil system must be checked.
There may be several reasons:
- Malfunction of the oil pump;
- Clogged filter element installed in the tank;
- Malfunction of the oil tank breather;
- Rupture of the oil hose;
- Mismatch of the oil hole on the tire and on the saw body (if the flow stopped after installing a new saw tire);
- Blockage of the oil channel in the saw body;
- Blockage of the oil supply channel in the tire;
- Malfunction of a gear wheel of a drive of the oil pump.
Self-repair of Husqvarna chainsaws is possible only if there is at least some knowledge about the operation of a two-stroke engine, as well as the principles by which a chainsaw is arranged. Practice shows that it is not difficult to disassemble a Husqvarna chainsaw, it is much more difficult to assemble it and at the same time not aggravate its malfunction. Calculate your strengths in advance and do not hope that you can repair the saw without any specific experience. In some cases, even experienced craftsmen make a lot of efforts to correctly diagnose a malfunction.