The Ural chainsaw, the carburetor adjustment of which will be described in the article, is the brainchild of the Perm Plant. This equipment has the same quality as the legendary Friendship. For several decades, this device has been a success with the consumer. If you also decide to become the owner of such an aggregate, then you should familiarize yourself with the structure and learn how to adjust the carburetor so that the work is as efficient as possible.
Chainsaw device
The Ural chainsaw, the carburetor of which you can adjust during the operation of the equipment, has a two-stroke gasoline engine with a capacity of 5.5 liters. from. The unit has an impressive capacity. If you compare with the "Friendship", then it is a little easier and allows you to rotate the saw mechanism by 90 °.
The equipment belongs to the professional class, because the design has a vibration-damping frame and forced constant lubrication of the saw chain. The model became universal only after the manufacturer decided to equip it with a hydraulic wedge. The design is equipped with an anti-vibration system, which has a shock-absorbing suspension that separates the frame from the engine.
For reference
The mesh of the air filter is made with a large cell, the dimensions of which are tenths of a millimeter. If we make a comparison with foreign analogues, then the mentioned parameter there is a fraction of a millimeter, this reduces efficiency and increases the proportion of oil and gasoline to 1 to 50.
More about the device
Engine parts are not adjusted as carefully as in imported models. This suggests that there will not be any special problems when garbage gets inside. The Ural chainsaw, the carburetor adjustment of which can be performed by the home master yourself, comes complete with instructions, it is quite voluminous. However, the available information does not exclude engine wedging, periodic gearbox failure, connecting rod breakage, as well as increased fuel consumption.
There is no chain brake in the design. This feature can be called a trifle, but only as long as the problem does not affect you personally. The Ural technique, however, has one important advantage, which is expressed in sawing along the fibers.
Features carburetor adjustment
In order to avoid problems with operation, it is necessary to adjust the carburetor. Different modes provide for the use of certain proportions of the fuel mixture. The consumer’s task is to find the factory settings. The tool must work without changing the set parameters for several hours.
At the next stage, the saw can be started and worked with it at minimum speed. Use the adjusting screw and screwdriver to set the desired position. The engine should gain speed gradually. In this case, the chain on the bus must be stationary. You can go to higher speeds in the next stage. If smoke has appeared from the engine, then tighten the screw. The smoke will go away, because the mixture will become poorer.
The carburetor of the Ural chainsaw should be adjusted in such a way that the increase in speed when the throttle is pressed sharply occurs quickly, but quite smoothly. It is important to exclude jerks. Unscrewing the screw will enrich the mixture, while depletion will occur when it is tightened. This will adjust the carburetor.
Device of the BP-45-3.0 brand chainsaw
The Ural BP-45-3.0 chainsaw, the carburetor adjustment of which was described above, has two piston rings, an adjustable oil pump and an automatic chain lubrication function. The design provides for the presence of an engine, the volume of which is 45 cm 3 .
The tire is 45 cm long. Chain pitch is 0.325 inches. 550 and 260 ml, respectively, can be accommodated in the fuel and oil tanks. The device assumes a primer. The manufacturer supplied the equipment with chrome cylinder walls. The leading asterisk is collapsible.
Adjustment of the Ural 2T chainsaw
Adjustment of the carburetor of the Ural-2T-Electron chainsaw is as follows. The amount of mixture supplied to the carburetor can be changed using screw No. 3. This will limit the rotation of the throttle control lever. The quality of the mixture can be changed with screw number 1, which is located on the carburetor.
Adjusting the carburetor of the Ural-2T chainsaw may also involve adjusting idle speed. In this case, the engine should work evenly and steadily at idle, while the saw chain must remain in place. It is important to ensure that the engine does not emit large amounts of smoke. It should have a good throttle response. This suggests that the engine should develop speed easily and quickly with a sharp pressure on the control lever.
Idle speed adjustment can be performed by starting and warming up the engine at low and medium speeds. Minimum steady turns are established by the screw No. 3. In this case, the chain should not move along the bus. If the engine smokes excessively, then this indicates a rich mixture. In this case, it is necessary to turn screw No. 1 until the revolutions increase and the smoke decreases.
Turnovers in the next step should be set to a minimum. To do this, loosen screw number 3. The carburetor of the Ural 2 Electron chainsaw is adjusted according to the same principle. The next step is to check the engine throttle response. To do this, the throttle control lever must be pressed fully. The engine should gain momentum. If at the same time a power failure occurs, then screw No. 1 is turned out by the required amount. The speed will decrease. In order to increase the speed, the screw must be partially screwed up and the engine checked for throttle response. The carburetor adjustment of the Ural Electron chainsaw in the next step involves fixing the No. # screw with locknuts.
Recommendations for the operation of chainsaws in the winter
When preparing the tool for use in winter, when the ambient temperature drops below -10 ° C, it is necessary to turn on the carburetor heating system. To do this, the aluminum shutter is removed. It is previously necessary to remove the cover, carburetor and casing.
The condition of the rubber crankcase seals should be checked if it is planned to operate the chainsaw at temperatures ranging from -25 to -40 ° C. If the seals have lost elasticity or are worn out, they must be replaced. A mixture of gasoline and oil should be used to lubricate the saw unit.
Conclusion
In order to work with a chainsaw as efficient as possible, it is necessary to run the tool before starting. This also applies to changes in operating conditions. To ensure stable idle speed of the crankshaft, it is necessary to adjust the engine. It should have good throttle response, and the work of the unit itself should be productive.
The operator should also know how to adjust the idle speed. This can be done by changing the quantity and quality of the combustible mixture that enters the engine cylinder. The quantity can be changed using screw number 3, it limits the rotation of the control lever. The consumer must know this in order to ensure the normal operation of the device.