Husqvarna 142 Non Lubricated Chain

Principle of operation

The main unit of the system is the pump. The principle of his work is subsequent. As the engine rpm increases, the gear mounted on the main shaft drives the pump shaft through the worm gear. In turn, the rotation of the shaft makes a certain pressure in the oil line, which forces the oil to move along it towards the tire.

The end of the oil channel is located at the place where the tire contacts the tool case, where there is a longitudinal groove onto which the oil channel enters when the tire is installed.

A groove is needed to ensure the supply of oil to the tire, regardless of the degree of chain tension of the chainsaw. Simply put, no matter what position the tire is at the time of operation, oil will flow through the groove through it.

Further, a chain is included in the lubrication process, on the links of which, depending on the model of the chain, there is either a groove or a hole through which the oil is dispersed throughout the tire. With an increase in engine speed, the oil feed rate also increases.

Some chainsaw models are equipped with pumps that additionally have a capacity control, and if necessary, the amount of oil supplied by the lubrication system can be increased or decreased.

Signs of a malfunction of the lubrication system, checking its performance

  • The chain of the chainsaw is dry and has a pale shade without shine.
  • The chain stretches relatively quickly.
  • The tire is very hot and may even partially melt the paint.
  • Oil from the tank is practically not reduced.
  • Sharp chain cut efficiency

All these signs indicate that the lubrication process is abnormal. In order to check the oil supply by the lubrication system, it is necessary to remove the side tire of the chainsaw and start it. Next, you need to slightly increase the speed while observing the end of the oil line. If oil comes in, most likely its quantity is not enough for normal lubrication and you need to clean or replace the filter and, if possible, adjust the flow. In the case when it does not arrive, the problem is more serious and requires further diagnosis.

There is a way to check the oil supply without removing the tire. To do this, it is necessary to direct the end of the tire to the side, for example, of freshly sawn chocks from the cut side and maximize the speed, while you should try to keep the end of the tire at a distance of no more than 10 cm from the chocks. If oily stains begin to appear on its surface. then the oil is supplied.

Most common malfunctions

  1. Breakage of an oil hose. Communities ›drive2 in the country› blog ›benzopila flowing from oil to lubricate the chain. It can sometimes be found during visual inspection. The problem is solved by replacing the defective part.
  2. Lack of thread on the shaft of the oil pump will help replace it.
  3. A defective thread on the pump drive gear is likewise solved by installing a new part.
  4. No corkscrew of the main shaft (relevant for some models of tools, for example, Homelite). You can fix it by installing a corkscrew that is suitable for the diameter of cloves instead of the native corkscrew, cutting it to the required length.
  5. Blockage in the highway. It can be removed by blowing with compressed air or mechanically, using a wire of suitable diameter.
  6. Clogged filter element.
  7. The Stihl MS 180, whose pump is not separable, often clogs. You can try to rinse in clean gasoline if it does not help replace it.
  8. In Chinese chainsaws (Gypsy), very often cuts the grooves on the main gear, through which the force from the sprocket is transmitted to it.
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Stihl MS 180 individual lubrication system malfunction

Due to the fact that the Stihl MS 180 is one of the most common chainsaw models, I would like to dwell on one malfunction inherent only to it and describe a method for eliminating it without replacing parts.

Quite often on a Stihl MS 180 chainsaw, there is a depressurization of the oil line in the place where the oil pipe coming from the tank is installed in the saw body. The malfunction can be determined by the characteristic smudges on the bottom of the tool.

To eliminate the malfunction, it is necessary to remove the chainsaw handle, remove the hose from the bore hole, clean and degrease it. After all these manipulations, apply sealant to the hose seat and install in the chainsaw body.

You can learn more about troubleshooting and a complete diagnosis of the Stihl chainsaw lubrication system by watching the video, which shows step by step the process of disassembling and repairing the lubrication system.

In modern chainsaws, a reliable supply of lubricant for the chain is organized, in case of malfunctions of which, it is not worth operating the chainsaw in order to avoid further breakdowns. It is better to troubleshoot the lubrication system by contacting a service center or a specialist with repair experience, this ensures the quality of the final result.

Classic chainsaw layout

Almost all professional and amateur chainsaws are equipped with air-cooled two-stroke gasoline engines.

Husqvarna 142 Non Lubricated Chain

Husqvarna chainsaw: main components

This implies the presence of at least one cylinder with heat sink fins. The fuel supply system (carburetor) serves as a mixer of gasoline with air. Dirt, dust, chips should not enter the working combustion chamber together with the fuel mixture, and filters are installed on the saws to clean the supplied air. Manufacturers recommend changing the filter once a season. In the interval between replacements with a frequency of once every 10-15 refueling, it must be cleaned.

For convenience and ease of starting the internal combustion engine, a starter is provided in any chainsaw, which is a coil with a wound cable and a handle. Even the most powerful husqvarna chainsaw comes with a thoughtful trigger mechanism.

In order to reduce the vibration transmitted to the hands of the feller, a special device is installed on the instrument. In addition, this mechanism prevents the "pull" of the tire during the sawing of wood.

Видео: Husqvarna 142 Non Lubricated Chain


Frequent Chainsaw Problems

Regardless of the power, performance and size of the models, their problems are divided into 2 types:

  1. Malfunctions of the engine, fuel supply system, cylinder-piston group, muffler;
  2. Transmission failures (malfunctions of the brake system, tires, chains, clutch, etc.).

Based on many years of experience, most experts say with confidence that the main causes of breakdowns lie in the internal combustion engine. The vivid manifestations of the incorrect operation of the chainsaw motor include:

  • difficult start;
  • unstable idling;
  • does not develop full power;
  • extraneous sounds are heard during operation.
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In order to reduce the complexity of diagnosis and subsequent repair of the Husqvarna chainsaw, do-it-yourself experts advise starting with units and parts that are simpler in maintainability.

Ignition System: Possible Problems

The first step in ignition diagnostics is to check the spark plug. It must be turned out of the cylinder shaft with a special key or socket head. The gap between the side and center electrodes should vary from 0.7 to 1.5 mm.

Husqvarna chainsaw malfunctions

If there are traces of gasoline on the surface of the candle, then most likely it does not burn out completely. It is not necessary to look for the causes of malfunctions in the Husqvarna ignition system in the absence of moisture on the plug, since in this case the fuel system settings are necessary, the steps of which are described below.

The most common types of ignition failures include the incorrect clearance (more or less 0.2 mm) between the flywheel and the ignition coil. It can also be set independently by means of probes.

Fuel system repair

The fuel supply system is one of the most complex in the unit, and therefore it should be taken as seriously as possible and follow certain rules. Gasoline may not enter the carburetor for the following reasons:

To clean the breather, you must prepare a regular sewing needle. In the second case, it will be necessary to dismantle the tank and replace the fuel purification filter.

DIY carb tuning husqvarna

Carburetor with adjusting screws

The entire model range of the Swedish manufacturer is equipped with traditional carburetors with three adjustment screws:

  1. Screw "T". setting the flow of the mixture at idle;
  2. Screw "L". adjustment at low speeds;
  3. Screw "H". at maximum speed.

Carburettor Setting Procedure

First of all, you need to screw L to "find" the highest speed in the absence of load (at idle). Next, turn it counterclockwise by a quarter turn.

If in this position the circuit on the bus continues to move, stop by screw T.

Chainsaw carburetor husqvarna

To adjust the Husqvarna carburetor at maximum speed after pressing the accelerator key to full wait 10-15 seconds. Turn the screw “H” clockwise ¼ turn and listen to the operation of the internal combustion engine. If during operation of the motor there is an extraneous sonorous "screech", little by little we unscrew the bolt until it disappears. On the contrary, with excessive smoke, it is necessary to impoverish the mixture, gradually tightening the screw.

After setting the minimum and maximum revolutions, we set the idle speed of the saw. To do this, turn the T screw clockwise until the chain begins to move along the bus.

Proper adjustment of the fuel supply system requires a tachometer (a device for measuring revolutions per minute), as well as the experience of the owner.

Chainsaw starter

The engine start system is used to rotate the shaft and, as a result, the appearance of a spark and ignition of the fuel mixture. Like most models, the Husqvarna kick starter consists of:

Husqvarna chainsaw starter

When the starter jerks, the ratchet of the drum engages with the engine shaft, as a result of which the crankshaft will scroll. Despite the condition of the tool, starting the engine the first time is quite problematic. To facilitate start-up, you need to make a few clicks of the primer (button for pumping the mixture). In the design of the starter, a backup spring can be provided, which after compression of the main one gives a sharp impetus to the shaft. As such, repair of the starter is not provided and if one of the elements breaks, it will need to be replaced.

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Features of husqvarna chain: design, tension

The cutting chain of saws from this manufacturer consists of working teeth, depth-of-cut limiters, and fixing pins. The most loaded in the process of sawing are cutting links made of high alloy structural steel. By design, they are divided into left and right. The width of the cut is determined by the distance from the lateral edges of the left and right links.

DIY chain tension husqvarna

The main characteristic of the chain for husqvarna chainsaw is the step, which can be measured from the first to third rivets, dividing the result into two. Due to the fact that in the Western system of calculation, the inch is adopted, manufacturers in the passports indicate the step in inches in the instrument (25.4 mm). 3/8 inch chains are used for medium power chainsaws, and 4 for heavier chainsaws.

One of the most important indicators of the chain is the shank thickness, which for most models is 1.3 mm. They are often used on specialized and conventional amateur tools. The thickness of the links must certainly be consistent with the groove of the tire, since excessive thickness can lead to an open or fall of the chain.

When the chain relaxes, it is necessary to tighten it by means of the mechanism unit located on the side. Having previously removed the left side cover (2 bolts), weaken the tire for husqvarna chainsaw. Next, we unscrew the longitudinally twisted bolt, thereby moving the guide away from the power unit. With proper adjustment, the chain should spin easily, but not hang on the tire.

Husqvarna chain brake

An important protective unit in a chainsaw is certainly the chain brake, which, in the event of a reverse impact, blocks the rotation of the cutting edges. As a result of the rebound of the tire in the direction of the feller and, as a result, of his possible injury, the friction mechanism disengages the drive sprocket and drive shaft.

Garbage chain chainsaw husqvarna

The start of the brake may have a contact or inertial design. In the first case, the protection will work as a result of the reverse rejection of the unit. The inertial brake system consists in the occurrence of large inertial forces acting on the drive shaft. Regardless of the features of a particular design, experts recommend purchasing chainsaws equipped with similar mechanisms.

After the repair and adjustment of the Husqvarna chainsaw is carried out, it is first necessary to check the operation of the brake unit.

Husqvarna Chain Lubrication: How It Works

In all presented chainsaw models, oil is automatically supplied to the tire.

Main components of the husqvarna chain lubrication system

Before starting work, make sure that there is lubricant in the reservoir. The oil pump interacts with the drive sprocket, and when the shaft rotates, the gear delivers lubricant to the working surface of the chain. Due to the constant presence of oil on the cutting edges, the chain is less susceptible to friction and, as a result, loses its properties noticeably slower. If the lubrication mechanism of the husqvarna saw fails, a small chain with a brown tint will be observed. Periodically, the left protective cover of the unit must be removed and the oil hole cleaned with compressed air or a needle. The delivery rate of the pump unit directly depends on the number of revolutions of the tool.