DIY Husqvarna 236 Chainsaw Carburetor Adjustment
Setting instructions
Before proceeding to setting up the Husqvarna 137 chainsaw, you need to install it. Before work, you need to study the device of the Husqvarna 137 chainsaw.
Hold the guide bar against the chainsaw body to install the clutch cover.
For the disassembly and assembly process, see:
About the manufacturer
The company under the name “Husqvarna” was founded in 1687. Husqvarna (Husqvarna) is a favorite in the production and garden equipment market. Chainsaw “Husqvarna 137” is built into the chainsaw to learn how to adjust. Enters a Swedish concern that unites several companies within itself. Manufacturing all kinds of equipment ranging from small sewing machines to impressive ATVs.
Husqvarna offers its customers a very wide range of special machinery and equipment. In recent years, the company has increased the number of patented innovations. Husqvarna stands firm on the watch for progress.
The manufactured products of this brand turn hard work into an ordinary occupation that does not harm either humans or the environment.
The Husqvarna 137 chainsaw belongs to the forestry professional category. Together with this model, the manufacturer also produces universal professional chainsaws, blowers and pole saws. All manufactured equipment is distinguished by its small dimensions and ease of operation. All Husqvarna chainsaws are distinguished by three features. the ability to absorb unnecessary vibrations, an improved air filtration system, the highest power.
Chainsaw carburetor Husqvarna 137: adjustment
Among dozens of models of chainsaws, one of the most interesting in its class should be noted. the Husqvarna 137 chainsaw. Its low power and simple characteristics make the model an amateur class, not intended for professional use or frequent work. With a weight of 4, 6 kg, the device produces a power of 1.6 kW, therefore it is used in a private area for simple purposes. cutting knots, branches, harvesting firewood, etc.
But in order to keep the chainsaw in good condition, even if it is branded and has low power, you need to service it on time. It is important to monitor indicators such as carburetor performance and chain condition. The carburetor of the Husqvarna 137 chainsaw assumes timely tuning and adjustment of the main indicators. In principle, the procedure is carried out according to standard rules, but the design of the device assumes certain nuances.
Chainsaw adjustment Husqvarna (Husqvarna) 137
To begin with, a Walbro carburetor model WT-660 is installed at the chainsaw. This is a popular model, well-tuned for various settings. Accordingly, three screws are installed in it:
- Screw T. is responsible for idling;
- Screw H. allows you to adjust high rpm;
- Screw L. adjusts low rates.
The process is carried out in the following stages:
- We preheat the chainsaw, letting it idle normally, showing the optimal number of revolutions.
- First of all, we adjust the L screw (high rpm), looking for the highest value. After that, unscrew the screw a quarter of a turn.
- Stage two. we achieve stable operation of the circuit. If, with the above action, the chain continues to rotate, we find the screw T and try to adjust it so that the chain does not spin, working stably at idle.
- As soon as the engine is well warmed up, unscrew the H screw by ¼. After a couple of seconds of operation, the motor should run stably.
- If there is a squeal in the engine. the mixture is too lean, you will have to unscrew the screw H, if a lot of smoke is formed. an enriched mixture is obtained, we tighten the screw a little.
- The final stage is the idle setting. When the engine is running, turn the screw T to the right. It is necessary to achieve such a state in which the Husqvarna 137 chainsaw will work, and the chain will not rotate without gas.
We also advise you to look at the article on how to adjust the carburetor on a Stihl chainsaw, using the example of the Stihl MS 250 model: adjusting the carburetor.
Now you know how to adjust your Husqvarna 137 chainsaw. Please note that each time you adjust the screw, you need to test the resulting operating mode. In some cases, it is possible to achieve correct operation and a good set of revolutions by slightly deviating from the above instructions.
In addition, the Husqvarna 137 has an improved ignition mechanism that produces a spark. The manufacturer made sure that the “amateur” chainsaw was equipped with a device that is equipped with professional saw models.
The design of the Husqvarna 137 chainsaw is very close to the design of professional equipment. However, the ergonomic design is appreciated by amateurs too. The model is armed with an air injection system, which bears the title “Air Injection”.
- Fuel tank volume. 0.41l.
- Weight without fuel and without tire. 4600 g.
- Bus length. 220-380 mm.
- Vibration on the front handle. 4.9 m / s.Kv.
- Vibration on the rear handle. 7.7 m / s.KV.
- Chainsaw power. 2.2 HP.
- Motor volume. 36.3 cubic meters. Cm.
Chainsaw Husqvarna 137.
The owner of a chainsaw needs to know the main rules for operating the chain. In our article, you will learn how to sharpen a chain with your own hands.
And which sharpener to use for all this.
It will be easier to choose the right oil for chain saw chain lubrication by reading our other article.
Chainsaw “Husqvarna 137”: how to disassemble and assemble, how to adjust the carburetor. Similar posts
Chainsaw Husqvarna 137: adjustments and settings
Before you go shopping for a chainsaw, you need to decide what kind of work it will be intended for. This can be everyday work at a sawmill (see How to cut a tree with a chainsaw) or the introduction of a saw for work in the country.
In either case, the chainsaw from the manufacturer “Husqvarna” will be able to cope with the task.
Adjusting the carburetor on a Husqvarna chainsaw
Determining the need to adjust the carburetor on a chainsaw
Before you start adjusting the carburetor on a chainsaw, you need to make sure that it is generally required. It would seem an absurd phrase. However, in 90% of cases, when an inexperienced craftsman considers such an action necessary, the unstable operation of the instrument is associated with other reasons, including:
- Problems in fuel lines and filter. blockages, depressurization;
- Exhaust system malfunction;
- Clogged or damaged air filter;
- Unstable operation of the ignition system;
- Violation of the tightness of the engine crankcase.
Only if these problems are excluded, and the engine is unstable, it is safe to say that carburetor adjustment is required.
How to sharpen a chainsaw chain: tooth configuration and sharpening angle, templates and tools for sharpening, the frequency of the procedure; how to sharpen a chainsaw chain at home with a file, using an angle grinder, on a machine, additional recommendations.
How does the carburetor of a chainsaw work, on what principle does it work
Modern car engines are no longer equipped with a carburetor. Meanwhile, before, almost every driver knew how to adjust it. Today, chainsaws with injection engines have already begun to appear on sale, however, carburetor models will hold the palm for a long time, because their cost is 5-15 times lower than that of the modernized version.
The carburetor consists of several main parts:
- Aluminum body;
- Diffuser and air damper at the inlet;
- Nozzles (valves for adjusting the fuel supply);
- Sprayer (it is he who provides injection);
- Fuel (float) chamber.
The principle of operation of a chainsaw carburetor is quite simple. Fuel is supplied continuously, and its quantity is regulated by jets. Air enters through the air damper due to the air vacuum generated by the piston. The diffuser mixes fuel and air. It is this fuel-air mixture that enters the cylinder, forcing the engine to work.
Mechanic at home: adjusting the carburetor of a chainsaw with your own hands
Any internal combustion engine requires periodic maintenance, It doesn’t matter if it is the engine of a simple moped or a powerful multi-ton tractor. Such a tool as a chainsaw was no exception. After all, it is equipped with a single-cylinder two-stroke internal combustion engine, which also requires serious maintenance, although it is much easier to perform the necessary actions here. In today’s article we will talk about how to adjust the carburetor of a chainsaw with our own hands, find out how difficult it is, and figure out whether you need to be a professional mechanic to do this kind of work.
How to adjust the carburetor on chainsaws
To understand how to properly adjust the carburetor on a chainsaw, you need to see it, and therefore we invite the reader to pay attention to the example below.
To make the adjustment, you only need a slotted screwdriver, however, it will not be possible to perfectly fine-tune the carburetor without a tachometer (of course, if the person is not a minder or a professional driver with experience). Now let’s try to understand how to adjust the carburetor in a given situation.
How to set up a chainsaw carburetor if it won’t start at all
Quite a common problem in cases when a “master” from the “I know everything” series tries to get into the settings with hands that do not grow from the shoulders. In such a case, there are standard screw positions from which you can “dance” further. First, you need to completely tighten both screws (do not overdo it). Then unscrew:
- Screw L. one turn;
- Screw H. one and a half turn.
With regard to the idle screw, the throttle must first be completely closed (screw T removed). After that, it must be cranked one and a half turns clockwise and try to start the engine. If it did not work out, it is gradually added by a quarter of a turn before starting. When the engine starts to work, the position of the idle screw is adjusted so that the internal combustion engine does not stall, but the chain is still in place.
Machine for sharpening chainsaw chains: selection criteria, design features, technical and operational characteristics of equipment, the principle of operation of manual and automatic devices, an overview of popular models of sharpening installations.
How to correctly and accurately adjust the carburetor: step by step instructions
To make the information easier to perceive, we propose to consider it on the basis of photo examples with a description of actions in tabular form. The basis is a chainsaw with initial settings.
Chainsaw Husqvarna (Husqvarna) 137. Carburetor adjustment.
The best advice that I can give you is to contact the specialists! Believe me, for very little money, specialists will adjust the carburetor, check the general condition of the saw. But if you still need to adjust the carburetor on the Husqvarna 137 saw yourself, then I will try to describe this process in detail. I also added at the end of the post about how to adjust the carburetor of a chainsaw at idle.
Factory settings
The factory default setting for the Husqvarna carburettor is the position of the screws (H) and (L), in which a working chain saw is guaranteed to start. For Husqvarna tools, this is one and a half turns from fully tightened screws (H) and (L). In the process of adjustment, you must first set the screws to the standard position, then start the chainsaw and make precise adjustments to the power, the number of maximum revolutions and idle speed.
Carburetor accessories
First of all, it is worth figuring out which adjustment screws are provided in the Husqvarna 236 chainsaw.
The manufacturer equipped the model in question with 3 screws:
- L-screw adjusts the jet at low revs;
- The H-screw is used to adjust the jet at high speeds;
- T-screw is used to adjust the idle speed.
If it is necessary to adjust the supply of fuel, lubricant mixture and air access, the first 2 elements are used. Turning them clockwise, the mixture can be leaner and slower. Performing actions in the reverse order, that is, unscrewing the elements in the opposite direction, the mixture is enriched and the revolutions increase.
The idle speed is adjusted by the third element. Turning it clockwise, the revolutions increase, and to decrease them, the screw is simply turned in the opposite direction.
Adjusting and adjusting the carburetor Husqvarna 137
Husqvarna 137. Carburetor adjustment
In the picture above, you see three adjustment screws. Each of them has its own purpose:
Screw T is required to adjust the idle speed.
Screw L serves to adjust low rpm.
Screw H regulates high rpm.
Adjustment procedure:
First, with the L screw (rotating it), we look for the highest idle speed. After we have found them, it is necessary to turn this screw a quarter of a turn against the clock hand. If in this position the chain continues to rotate, then by rotating the screw T we achieve its stop.
Then we warm up the engine at full speed in the region of 10-15 seconds and turn the screw H a quarter counterclockwise. We wait 10 seconds and listen. the engine should work as a 4-stroke in sound. If a screeching sound is heard, the mixture is poor (unscrew the screw), if the enriched mixture smokes (tighten the screw).
After adjusting the low and high speeds, we set the idle speed with screw T. This is done as follows:
1.The engine must be running
2.Turn the screw T clockwise until the chain starts to rotate.
3.Rotate the screw in the other direction until the chain stops.
With a properly adjusted carburetor, your chainsaw quickly picks up speed and sounds like a 4-stroke engine.
Remember that a tachometer and experience are required to properly adjust the carburetor of your chainsaw. Therefore, it is better to contact a specialized service.!
Nuances of adjustment
After adjustment, the chainsaw should easily pick up and drop speed, work stably at low and high speeds. If the saw chain rotates at idle after adjusting the carburetor control screws, this is a sign that the adjustment has been made incorrectly and the position of the screw (T) must be corrected.
Also, when adjusting the Husqvarna carburetor, it is worth considering the response time of the chainsaw to the rotation of the screws. The settings do not change immediately, but within five, ten seconds.
One of the indicators of an incorrect adjustment is a strong smoke during the operation of the saw, which indicates a large amount of fuel entering the combustion chamber. If such a situation occurs, you need to correct the position of the screw (L).
Step-by-step adjustment
Experts recommend making an independent adjustment of the carburetor in the model in question, adhering to the following plan:
- First of all, you need to adjust 1 screw, then proceed to the second and only lastly, do the adjustment of the screw responsible for idling.
- Next, you need to determine what are the largest idle speed. To do this, you need to carefully turn 1 screw clockwise. Having found the largest value, the element should be turned ¼ turn counterclockwise. If, during this operation, the chain continues to rotate while idling, the T screw must be slowly turned counterclockwise until the chain stops rotating.
- Using the screw H for adjustment, it is really possible to change both the power of the unit and the frequency of its revolutions. However, it should be borne in mind that if the carburetor will work for a long time due to the ordinary mixture and at increased speeds, this can cause the chainsaw to fail.
- To adjust the screw H, you need to do the following steps:
- Warm up the engine of the unit for 15-20 seconds by selecting the full speed mode;
- Turn the H-element counterclockwise by ¼ turn;
- Leave the engine running for 10-15 seconds;
- Using a tachometer, analyze what the maximum speed is;
- If the received data does not match the passport, the process should be repeated again.
The four-stroke sound of the engine will help to understand that the adjustment is made correctly. If the mixture after adjustment is too lean, the unit will make a squealing sound. If the mixture is too saturated, smoke will start to appear from the muffler. If in the arsenal of home craftsmen there is a device called a tachometer, then you can proceed to self-adjusting the H-screw. Under other circumstances, it is better to seek help from specialists.
- After the first elements are adjusted, you can start adjusting the idle screw, performing the operation in the following sequence:
- After activating the engine, you should carefully begin to turn the screw T clockwise;
- It is necessary to turn the element until the chain of the unit begins to rotate;
- In the next step, the screw must be turned in the opposite direction to stop the rotating movements of the chain.
To understand that it was possible to correctly set the number of idle revolutions will help the uniform operation of the engine, in all directions, with the necessary reserve of revolutions, during the rotation of the chain.
To independently understand that the work was done correctly, it will be possible to operate the engine, which should instantly accelerate and emit a four-stroke sound at full throttle. If the unit starts with difficulty, the engine will not be able to accelerate immediately, the first screw should be readjusted again to enrich the lean mixture.
Modern chainsaws have a complex system and consist of several main units that periodically require maintenance and adjustment. In this article, we’ll talk about how to adjust the carburetor on a Husqvarna chainsaw.
Chainsaw carburetor adjustment
Most chainsaw carburetors have three adjustment screws:
- L. jet screw for adjusting low speed
- H. jet screw for high speed adjustment
- Screw. T at Partner and Husqvarna (at Calm LA). adjusting the idle speed of the chainsaw
Screws H and L adjust the ratio of the mixture of gasoline and air, determined by opening the throttle valve of the carburetor. When the screws are unscrewed, the mixture is enriched, and the revolutions increase accordingly, when the screws are tightened, the mixture becomes leaner. the revolutions fall.
The screw T (LA) is designed to adjust the idle speed. The basic setting of the chainsaw is made at the factory during the final test. The carburetor is usually adjusted for a richer (than optimal) fuel mixture. The factory setting must be maintained during the first hours of saw operation. Then (optional) a more precise carburetor adjustment is made.
We begin the adjustment by setting the idle speed, for this we turn the screw T (LA) counterclockwise, achieving a complete stop of the chain at stable engine speeds.
For further fine adjustment, you need a tachometer and it is better to entrust it to specialists. over, in most cases it may not be needed.
We start setting up the tool with the L screw, then use the H screw and finally the T screw (LA).
We find the highest idle speed, for this we slowly turn the screw L in different directions. After finding the position of the highest engine speed, turn the screw L 1/4 turn counterclockwise. If the chain rotates at idle speed, the screw T should be turned clockwise until it stops.
The screw H adjusts the power and speed. Adjusting the carburetor to a lean mixture leads to excessive speed, overheating of the engine and failure of the piston chainsaw.
We warm up the engine of the chainsaw at idle speed for at least 10 seconds and turn the screw H 1/4 turn counterclockwise. Let the engine run for about 10 seconds. Then we check the maximum engine speed with a tachometer. If the maximum speed does not match the passport, the operation should be repeated. When the mixture is too rich, the muffler starts to smoke, when the saw is too lean, it squeals and overheats.
We finish the adjustment by adjusting the idle speed, as already described above. The idle speed is set correctly if the engine runs smoothly at minimum speed and the chain does not rotate.
The carburetor can be considered adjusted if the engine accelerates quickly and sounds like a four-stroke at full throttle.
The chainsaw is considered by many as the ideal and irreplaceable assistant. After all, with its help, you can perform all the work that the ax previously helped to do, while not spending a lot of time and effort. That is why almost every home craftsman has such a tool in his arsenal.
The design of the units under consideration is not so complicated. And this means that every craftsman can repair the tool, taking into account the advice of specialists. We will look at the sequence in which the Husqvarna 236 carburetor is adjusted with our own hands.
DIY carburetor repair
If in the course of carrying out a complete diagnosis of a Husqvarna chainsaw, carburetor defects were found, then some of them can be repaired without contacting a Husqvarna AB service center. For example, you can independently:
- Change the gaskets under the covers of the main chamber and the fuel pump;
- Clean or replace the mesh filter;
- Replace main chamber diaphragm or needle valve;
- Repair the fuel pump diaphragm malfunction.
Gaskets, diaphragms and a rocker needle valve can be found in the repair kit provided for each Husqvarna chainsaw carburetor.
Also, if you have some experience, you can try to restore a faulty injector valve, but you cannot guarantee a positive result when trying to restore an injector, if it is faulty, manufacturers recommend changing the carburetor completely.
The first thing to do before removing the carburetor from Husqvarna is to clean the saw with a compressor, since Dirt can interfere with a quality repair. Next, you need to open the top cover of the chainsaw, remove the air filter, disconnect the rods from the control levers of the air and throttle valves. Then unscrew the carburetor fixing screws.
It is quite easy to disassemble the carburetor body for repair. The main chamber cover is held in place by four screws that can be removed with a regular screw, the fuel pump cover is secured with one wide screw.
Below is presented. After watching it, it will become clear how exactly you can repair the carburetor without contacting a Husqvarna service center.