Where is the breather plug on a Chinese chainsaw?

Chain brake

Activation of the chain brake can be contact and inertia. Where is the breather plug in a chain saw? Have a negative effect on. The first occurs when the brake stop (1) is pressed against the operator’s hand, which occurs spontaneously when the saw is swung out of the way. The resulting misalignment of the stopper causes the brake band (2) to tighten on the clutch drum and stop the clutch, which also stops the saw chain.

Inertial brake activation is based on the inertial forces generated by a sudden impact on the tire, acting on the brake components, which have the same effect as in the first case. tightening the brake strap and stopping the chain. Inertial brake application is faster than contact brake application.

Chain brake activation can be either contact or inertia operated. The first occurs when the brake stop (1) is pressed on the hand of the worker, which occurs spontaneously when the saw is ejected. The resulting displacement of the stop causes the brake band (2) to tighten on the clutch drum and stop, which also stops the saw chain.

Inertial brake activation is based on the inertial forces acting on the tire when the tire suddenly hits, which affects the brake components, resulting in the same result as in the first case. by tightening the brake belt and stopping the chain. Brakes are activated quicker by inertia than by contact.

oil pumps are of different designs (piston or diaphragm) and made of different materials (metal or plastic). They are activated by a gear that receives its motion from the drive sprocket. No oil leaks when the engine is idle (drive sprocket and chain are not turning).

How to get to the breather plug?

You do not need special skills. The easiest way to do this is to refer to your model’s instruction manual. Nevertheless the instructions for removing the handle can be helpful.

First of all, pay attention to the preparatory phase.

• To make cleaning easier after removing the saw handle, remove the bar and chain, the side cover. It is not necessary but it is advisable, because you can remove traces of oil, dirt, filings with a brush and compressor.
• Put the dismounted parts aside.

After cleaning we proceed to removal of the handle.

• The handle is attached to the body with three shock absorbers (all rubberized), but it is not possible to remove them at once, so we start with the plastic plugs. They are usually located in the inner cavity of each shock absorber.
• Take a strong screwdriver and start squeezing the shock absorbers. Start with the one close to the handle at the back.
• Remove the two screws that will allow us to remove the wire rod (it is connected to the carburetor and throttle trigger, located close to the handle where you removed the first shock absorber).
• At the end you are left with the handle, which is connected to the shock absorber. Now it remains to unscrew the body (bend aside the inner part of the handle).
• Remove the housing from the rubber band. All done!

If you have disassembled the chainsaw before, you will cope with the disassembly of the handle quickly.

This step is usually followed by disassembly of the starter. But, considering the standard features of the chainsaw structure, we don’t need this step to get to the breather valve. The starter can also be removed if desired, as a lot of sawdust accumulates under it.

Diagnostics and troubleshooting

Repair efficiency also depends on properly performed diagnostics, because quickly identifying the problem will save time on repair work. If your Partner chainsaw isn’t working, there are three steps to diagnosis:

often than not, the chainsaw malfunctions because there is either nothing to burn or there is nothing to ignite. Therefore, first you need to check the spark plug, for which it is necessary to unscrew it, and the wire put to the cylinder, and then pull the starter. spark can be missing due to defective plugs, broken wires in the circuit power, a faulty ignition switch or no gap between the flywheel and coil (possible and breakage of a key from the flywheel crankshaft). Lack of spark might cause chain saw to start but stops immediately on throttle.

If there is a spark, then the fuel system needs checking, especially if it is found that the spark plug is dry. The diagnosis is as follows. Pour 5 ml of fuel through the spark plug hole and then start the saw. If start is unsuccessful, it is possible that the cylinder block is worn out or a foreign body gets into the cylinder block. If the saw starts, the problem may be the carburetor or the fuel line malfunction.

Diagnosis of the chainsaw Partner also includes checking the clearance of the crankshaft bearings. To do this, jiggle the flywheel in different directions. If there is a gap, the bearings need to be replaced.

Other malfunctions are also possible, which you can solve with your own hands. For example, the saw does not pick up speed or the chain is not lubricated. The first problem is associated with improper adjustment of the carburetor, and the second. with clogged hoses or insufficient oil in the fuel mixture.

Fuel system

In order for the fuel tank to be filled with air during the consumption of the fuel mixture, no negative pressure is created here, which will not allow the fuel to flow with its use into the carburettor, not in this case, so that the fuel does not leak from the air hole, a breather valve is made in the filler cap, which closes the hole. Not when, if the breather is clogged with dirt, the chainsaw will stall.

Fuel is pumped from the tank through a hose loosely hanging in the tank. Using this fact, regardless of the chainsaw’s position, the hose is always immersed in fuel. A fuel filter is attached to the inlet end of the hose. The fuel is pumped by a pump inside the carburetor.

To make starting easier, some chainsaws are equipped with a manual booster pump. the primer. When starting the chainsaw with primer, the carburetor is filled with fuel in advance (the excess fuel flows back into the tank). Using this fact, the engine starts quicker, t.к. the stage of filling the carburetor with fuel is already passed, which without primer is done by the carburetor pump by using the starter motor.

How to Clean a Check Valve and Restore the Tool to Its Proper Functionality

First, let’s understand how to know if the breather is faulty and needs to be cleaned or replaced. There are three ways to do this.

• The first method involves inspecting the condition of the hole on the gas tank lid. If the hole is clogged with mud, the valve definitely needs cleaning.
• The second way is if the lawnmower won’t start or if the engine stalls after a short run. This is an indirect indication that the carburetor cannot pump fuel into the system due to pressure created inside the tank.
• The third way is to disconnect the fuel hose from the carburetor and look. If fuel is squirting out in a steady stream, the equalizer is intact and does not need repair. If fuel does not come out or flows in a weak stream, it indicates a defect in the equalizing valve. No fuel is leaking due to the pressure inside.

Verify that the problem lurks in the breather is simple enough. to do this, try to unscrew the cap. If it is difficult to do, and when you turn the hatch you hear an air bleeding sound, it is definitely worth cleaning the breather plug.

The check valve can be cleaned in the following ways:

• Use a needle and compressor. Needle is needed to remove dirt from the hole in the tank lid. Compressed air from a compressor should be blown through the hole on the back side to get any remaining dirt out of the hole. This method is simple, but not always suitable
• Disassemble the breather plug and inspect it, then clean or replace it. Repair kit breather is not sold, so if the filter element or the valve itself is damaged (usually in the form of a rubber seal), you will need to buy a new gas tank cap for your tool model

Below you will find instructions on how to disassemble and clean the breather plug yourself:

• The first thing to do is to make sure that the breather is in the tank lid. Next, consider the case where the check valve is located in the cover structure
• Remove the safety catch from the cover, which is used to prevent the hatch from being lost during refueling
• Proceed to remove the pressure equalizer from inside the cover. To do this, you need to pick up the device, and remove together with the rubber seal
• Removed parts from the cover are the rubber gasket and the breather filter
• Next you need to remove the filter from the rubber valve, and perform the cleaning and purging
• If the rubber valve shows no signs of damage, then it is enough to purge and clean it together with the filter, and then reassemble the device

At this point the repair procedure is complete, and it remains to check the serviceability of the lawnmower breather in action.

To summarize, it should be noted that this small detail is often the reason that it is impossible to start the chainsaw. Even a complete cleaning of the carburetor will not solve this problem. Often inexperienced mowers turn to service centers to repair the tool, not realizing that the cause is hidden in this small-sized part, which plays a very important role in the operation of the gasoline tool engine.

Gasoline saw repair with your own hands (repair of Chinese gasoline saw)

The 1st repair chainsaw your own hands: fell out the piston pin retaining ring (during the repair of the Chinese chain saw it is necessary to disassemble the engine completely, to change all gaskets, change the piston pin retaining rings, piston compression rings, eliminate bumps on the piston and the cylinder mirror or on the shiny or nikosyl coating of the cylinder inner surface).

Chainsaw repair with your own hands: a hot chainsaw glows when idling and when nozzles (the reason. problems with fuel supply, to fix the problem of a chainsaw, see “Troubleshooting”). carburetor and fuel line).

Echo Chainsaw Repair. Replacing the Tank Vent (Echo Part # A356000031)

Handwheel unscrewed and broke the shaft (new chain saw repair with our own hands).

The muffler key broke.

Oil pump actuator (plastic) failed.

Flew the needle drum bearing.

chain saw malfunction: brake band burns out (and covers melt).

Cracks in plastic cylinder and starter covers appeared (Chinese chainsaw needs repair).

the part of the drum in the starter, where the spring is catching, broke off.

A gasket under the muffler burned out.

chain saw repair with their own hands: rusty needle bearing inside the clutch drum (it should be cleaned, washed and lubricated, that the chain at idle speed didn’t rotate, the clutch unscrewed in a clockwise direction).

Broke the plastic starter shaft (can be replaced by a metal bolt).

Chainsaw repair with your own hands: starter spring cracked (replace with new one).

The drum of the starter broke (to avoid such things in the future, you need to replace the factory round rope on a flat capron).

Chinese chain saw repair: in the cylinder exhaust window (under muffler) you should check, and if there is, saw down the tooth-shaped metal tab with a file, t.к. Over time, this protrusion will damage the piston and rings.

To change the gasket between the crankcase halves (to put 0,2 mm thickness instead of the present thickness of 0,5 mm) in order to prevent air drain into the crankcase through loose seals.

It is necessary to remodel the valve on the fuel tank (from the factory it is for the vacuum in the tank; when the tank is heated during long sawing and, correspondingly, the pressure in it increases, gasoline saw starts working unsteadily). It is necessary to take off a handle of the gasoline saw and we will see a white cap on the tank, we should take it off, under it a black rubber band, remove it, we pierce the cap with an awl several times, assemble and all. gasoline will not flow out when bending, and the tank will squeeze the extra pressure.

Gasoline saw repair with their own hands: fills plug, eats gasoline, sucks air into the tank (leaky crankcase. you should check the seals on the crankshaft).

Tearing the starter cable when you stop the chainsaw (early ignition. remove the starter and check if the nut on the shaft is tightened, check the ignition coil fastening).

Torn cord at idle rpm (you need to add rpm with screw T and screw L all the way in and then turn it out 1.5 turns, eliminate air leaks between carburetor and cylinder).

Do-it-yourself chainsaw repair: spark gone (ignition coil malfunctioned).

Gasoline was leaking (changed the tank cap).

You need to change the chain to Stihl chain at once.

The chain catcher broke (Chinese chainsaw repair again).

If you had any other chain saw repair with their own hands (repairs Chinese chain saw), write about them in the Комментарии и мнения владельцев.