Husqvarna 142 stops when you press the gas

Repair of chain saw Husqvarna 142 with his hands carburetor

Problems, the solution of which can be the adjustment of the carburetor, quite a lot. Adjustment of the carburetor of a Husqvarna chainsaw is necessary when malfunctions such as:

  • High idle speed;
  • Strong smokiness when the tool is running;
  • Difficulty in cold or hot engine start
  • lack of traction and low maximum rpm.

This is by no means a complete list of problems, the solution to which can be the adjustment of the carburetor Husqvarna. In a number of cases, adjustment of the quality and quantity of the fuel mixture is carried out after the engine overhaul or in the course of the scheduled maintenance of the chainsaw.

The Husqvarna AB manufacturer recommends adjusting the carburetor before and after running-in.

Possible malfunctions of the Husqvarna 142 chain saw

Like any other devices, the operation of which is associated with intensive loads and difficult conditions, chainsaws Husqvarna 142 can malfunction, and the causes of failure can be divided into two groups:

  • Engine or piston group failure. Problems with fuel, exhaust, or ignition system.
  • Problems that occur in mechanical components. tire, clutch, brake or lubrication system, or chainsaw failure. can lead to serious injury.


Engine failure is one of the most common and time-consuming. This trouble is manifested by the following factors:

  • Unstable idle speed.
  • Won’t start.
  • Not enough power, or the chainsaw Husqvarna 142 starts and shuts down as soon as it begins to pick up speed.

Before we begin to repair your Husqvarna 142 chain saw we recommend that you perform a complete machine diagnostic to pinpoint the cause of the problem.

How the carburetor on a Husqvarna 137 chain saw works?

These chainsaws are often equipped with a Walbro carburetor ex works. Before you can adjust the Walbro carburetor on your Husqvarna chain saw you need to know how it works and have a basic understanding of how it works.

What controls the fuel-oil mixture

For precise fuel and oil delivery, operation of a fuel pump is used, which is driven mechanically from the crankshaft. The carburetor itself is equipped with a diaphragm and a special needle valve, which are responsible for regulating the pressure in the system. Thanks to them, the proper operation of the metering chambers and the pump is organized, which improves the performance of the chainsaw.

Preparation of fuel mixture

A fuel mixture of gasoline and oil in the ratio of 15:1 by volume must be used when operating the chainsaw, t. е. add 1 liter of oil to 15 liters of petrol and mix the mixture thoroughly. The amount of gasoline and oil in the fuel mixture is given in this table:

ATTENTION! Using oils: Lukonoi-2T; TNK-2T OIL: AZMOL Sport 2T GD” and Dr., and used oil in the fuel mixture will lead to failure of the connecting rod needle bearing

What’s in charge of the air supply

Two throttle valves on the diffuser chamber are responsible for the air flow. The first can regulate the amount of air at the moment of pressing the gas pedal and is called throttle, and the second provides air restriction at the moment when the chainsaw is started cold. To facilitate starting, the damper is closed, which means that the mixture becomes rich, as it is saturated with more fuel. It is easier to operate in this mode, but since it increases fuel consumption, this mode is not used throughout. The saw is working too hard.

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To atomize the fuel into the cylinders, a nozzle with a check valve is used.

The principle is simple: it restricts the return of the mixture into the chamber. All of the chainsaw‘s major malfunctions are usually caused by improper operation of this mechanism.

  • The most common mistake is storing the tool for too long. The point is that with prolonged inactivity the valve gets stuck and either fills the cylinder with fuel or simply does not open.
  • The second problem is the increase of air quantity in the mixture, caused by air sucked from the outside due to improper work of the valve. It is impossible to adjust here, because in this case only the valve repair or its replacement will help, because the adjustment screws will not respond to the saw.

Unlike a car carburetor, the adjustment of a chainsaw carburetor has three adjusting screws that are responsible for the quality of the mixture, quantity and nominal revolutions of the Husqvarna engine crankshaft:

  • L screw. designed to adjust the amount of rpm when working in mid-mode and adjusts the low rpm;
  • Screw H. adjusts the number of high revolutions and the thrust of the unit;
  • T. designed to adjust the total amount of fuel and adjusts throttle operation.

It is not recommended to touch the first two screws without special skills. The problem is that if you set them wrong, the carburetor will not be able to start the engine, or even start it in the wrong mode. Such adjustments can lead to premature wear and tear of the propeller. This principle is laid in many devices.

Setting options are not listed in any of the tables. So don’t look for this data in special literature, just follow the instructions clearly. The datasheet is for information only and has no information about the engine’s performance.

Deutz-Fahr tractors

German brand Deutz-Fahr specializes in the production of agricultural machinery, tractors. The golden rule of the manufacturer is to invest in development and innovation. As a result, modern and reliable agricultural machinery is produced, making your work easier and increasing your productivity many times over. Approximately 1 million machines are now in operation around the world. of the brand’s tractors.

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The product

The brand produces a large number of agricultural equipment, the most popular are tractors, precision farming systems and combines.

The following series are available today:

  • 6G.
  • 9 Series TTV.
  • 6 Series.
  • 7 series.
  • Agrotrac 130/150/170
  • Agrofarm G410/430.
  • Agroclimber F.
  • Agroplus F-V-S.

Precision farming systems are used in many modern farming operations. Automated control and synchronized operations greatly increase work efficiency. Deutz-Fahr offers reliable and precise automation. The Deutz-Fahr Precision Farming System is:

  • Receiving signals using all satellite systems, including corrective.
  • One interface for all processes and applications. It can be 8 or 12 inches.
  • Steering systems are represented by visual, power steering.
  • High-precision section control which avoids overlaps and omissions.
  • Fully automatic data control capability.
  • Implemented a safety system for large tractors, the camera has a large viewing angle.

  • HTS 6060/6090/6095

History and relevance

The history of the brand began much earlier than in 1977, which appears in many sources. The main protagonist was Nikolaus August Otto, who founded the world’s first engine manufacturer in 1864. Already in 1890 the threshing machine was invented. Four years later the first Deutz tractor with a 26 hp.с. In 1927 the first diesel tractor Deutz MTN222 was produced. It was the beginning of serial production of standard and nowadays habitual tractors.

Since 1936, small agricultural enterprises have already started to use mechanization and its face. Deutz F1V 414, with 11 liters of power.с.

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In 1937 Klöckner is acquired and becomes Klöckner-Humboldt-Deutz or simply KHD. This company became the largest conglomerate of the Reich. At that time, KHD was working in all areas related to engine manufacturing.

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Since 1949, the production of tractors with air-cooled Deutz F1514 and F2514 diesel engines has been started. Already in 1955 the 100-thousandth engine was produced.

1961 Beginning of co-operation with Fahr AG. This was made possible by a share swap with KHD. In 1968, KHD bought a part of shares of Fahr AG and a brand appeared, which is recognized today in many countries. Deutz-Fahr.

In 1977, the DX series engines were put into batch production, which a year later were officially introduced. The brand name was the Deutz-Fahr diesel engines with 5 and 6 cylinders. Their output varied from 80 to 160 liters.с. Slightly later, in 1980, the series was expanded with 4-cylinder models as well.

Production of AgroXtra tractors begins in 1990. 1991 Topliner series harvester.

The year of 1995 was a milestone, because Italian group SAME joined the corporation. The full name of the company has become: SAME Deutz-Fahr or SDF. The Agrotron series was also released.

In 1996 it was decided to move the manufacturing facilities from Cologne to Lauingen. The same year, the Gigant 400 forage harvester is presented. Further history is more related to the release of new equipment, namely:

  • 2001. Agrotron TTV with stepless drive.
  • 2004. production of Teleskoplader loaders and a rotary combine harvester
  • 2009. launch of Agrotrac series. Intended for countries with more stringent emission standards.
  • 2013. the C9000 series of combines.

The latest milestone in the brand’s history occurred in 2017, when the most modern tractor factory in Europe began operating. The main specialization. machines with 130 hp.с.

Deutz-Fahr machines are in great demand by farmers around the world, especially in Russia and the CIS states. They are loved for their performance, modernity, powerful and economical engines. After domestic tractors and combines, many have also appreciated the comfort of the operator.

Husqvarna 142 chain saw device

One of the main advantages of the 142-s model of the Swedish Husqvarna brand is the competent selection of its components and high quality of the original assembly. The basis of the garden tool consists of a 2-stroke gasoline motor, whose chrome-plated cylinder has a volume of 30 cm3. Starting the regular internal combustion engine is performed by pulling the cable of the manual starter. For the preparation and air enrichment of the fuel mixture in the configuration of the internal combustion engine is responsible proprietary Japanese carburetor brand Walbro with forged jets and improved fuel injection system. The manufacturer has equipped the engine with a fuel and oil tank, the volume of 370 and 190 ml, respectively.

The Husqvarna 142 chain saw has a durable clutch that ensures continuous communication between the engine and the saw headset. All parts of the mechanism are made of durable steel, resistant to high temperature and corrosion.

Methods of troubleshooting and repair with your own hands

Husqvarna chainsaw repair is complicated by the fact that it requires specific tools that are not usually part of a home handyman’s arsenal. But all of these can either be bought in an auto parts store, or make their own hands.

Husqvarna 142 chainsaw. Specifications

In addition to the usual sets of screwdrivers and a hammer will be required:

  • Piston stopper. Can be replaced by a synthetic cord from the starter with knots tied through 2-3 cm.
  • Screwdriver for chainsaw bolt heads. They are specific. in the form of semicircles or stars.
  • Key for clutch adjustment.
  • Candle-type combination wrench.
  • A compressor for cleaning sawdust, dust, and dirt from the interior.
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If you plan to clean and troubleshoot the cylinder piston group, you will need a compression gauge and glue sealant.

The procedure for disassembling a Husqvarna chainsaw is as follows:

Diagram of chainsaw ignition checker

  • the top cover is removed;
  • the emergency brake and the saw bar with the chain are disconnected;
  • remove the starter motor;
  • the spark plug is unscrewed;
  • a piston stopper is installed through the spark plug hole and the flywheel is removed (considerable effort is required).

After that disconnect the front handle, followed by the carburetor, the oil pump and, lastly, the engine.

Troubleshooting the ignition system is limited to replacing failed spark plugs with new ones. Only Champion RCJ7Y spark plugs are used. The ignition coil in Husqvarna chain saws is electronic, maintenance-free, and if it fails, it is replaced completely, just like the starter.

It is not necessary to adjust the ignition system. The only malfunction solved by the adjustment is to set the clearance between the flywheel and coil. The clearance is set with a feeler gauge. The standard value is 0.2 mm.

Tuning the Fuel System

The fuel system of Husqvarna chain saws is complicated. Don’t fix it at home and don’t service the cylinder and piston groups. The maximum malfunction that can be eliminated at home is to clean the breather, eliminate hose compression and replace the filter. The same goes for the oil system. troubleshooting comes down to cleaning the hole in the breather with a needle or compressed air. It is recommended to do it preventively every 2-6 months. depending on how often the saw is used.

Adjusting the carburetor

The Husqvarna 142 carburetor has three adjustment screws, labeled H, L and T. The first one is designed to set the injection at maximum rpm, the second one. at low rpm, the third one determines the parameters of fuel injection at idle.

Adjusting the carburetor on a Husqvarna 142 chain saw

First adjust the idle mixture injection by turning the screw L by ¼ turn counter-clockwise. If the saw chain moves. stop the movement by clamping the T screw. Check visually and aurally that the engine does not squeal and that there is no white smoke. The correct screw position is determined empirically.

After that the gas pedal of the chainsaw is clamped and the injection at high rpm is regulated in the same way with the screw H.

Excessive air intake into the carburetor can be eliminated by replacing the torn hose. the black tube that goes to the carburetor, or by adjusting it more closely.

Saw tensioning

The chain tensioner is on the right side of the saw chain. It is accessible by removing the side cover. Tension adjustment is made by turning the screw by required degree.

If the splines are worn, the drive sprocket must be replaced or the chain will not mesh with the chain.

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To change a part, you have to do the following

  • unscrew the nuts of the busbar cover and remove the headset using working tools;
  • remove the air filter;
  • unscrew the saw spark plug;
  • remove the clutch on the chainsaw;
  • Inspect the drum and check the crown;
  • to remove the chain saw sprocket;
  • if necessary, to replace the broken part with a new one;
  • Reassemble all the parts in reverse order.

If replacing a chain saw sprocket on your Husqvarna chain saw is difficult, use a professional.

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