How to Remove a Sprocket from a Husqvarna Gasoline Saw

How to Remove and Replace a Sprocket on a Gasoline-Powered Saw

Chainsaws made by renowned manufacturers of special tools are characterized by high reliability and long service life. This is due to the well-thought-out design and the use of special grades of tool steel, of which all moving and rubbing parts are made. These include, first of all:

  • The chain with cutting edges;
  • guide bar;
  • Chain sprocket, which is driven in rotary motion by the power of a single-cylinder two-stroke gasoline engine.

They all work hard and wear out over time. Even slight changes in the geometry of these parts would damage the performance and smoothness of the saw. If you need to remove the chain saw sprocket to replace it, you need to understand how the clutch system works, with which it has a direct connection.

Algorithm of carrying out clutch drum replacement

Regular technical inspections are necessary for the uninterrupted use of the chainsaw.

When carrying out clutch drum replacement, use only a certain type of a structural element of the device for installation. When replacing the drum, the bearings of the design element should be changed at the same time.

To carry out repair work, you should purchase a special repair kit, which includes a drive sprocket and a bearing. After acquiring a repair kit you should prepare the materials and tools required for repair. The main tools that will be required when carrying out the repair are the following:

  • A universal wrench that comes with the chainsaw;
  • piston stop, can be made of plastic or metal;
  • A special puller for the centrifugal mechanism or clutch drum.

The procedure for carrying out the work consists of several steps. Each stage has its own features depending on the design features of the chainsaw, but the scheme and the sequence of operations are the same for any model of the machine.

Sequence of repair work

The first step is dismantling the saw headset and removing the guide bar cover. After removing the cover the guide bar and the chain are removed. Unscrewing the mounting nuts is carried out with a universal wrench, which is included with the unit.

After removing the saw chain and guide bar the air filter is removed. Then the spark plug is disassembled. The previously prepared engine piston retainer is installed in place of the removed spark plug. A stopper secures the position of the piston in the cylinder and prevents the crankshaft from turning. Remove the clutch should be done with a special puller installed in the socket of the universal key. Do this in a clockwise direction.

After removing the clutch, the internal parts of the device are accessible, i.e. after the clutch has been removed, the sprocket can be removed.

After removing the clutch drum, depending on the assembly type inspect and check the chainring and sprocket. Depending on the design of this assembly, worn components are replaced. When carrying out repairs, special attention should be paid to the centrifugal mechanism springs and cams. If wear is detected, they should be replaced.

If the components are OK, all of the components are reassembled on the chainsaw in the reverse order. First unscrew the piston lock and pull out the starter cord, then refit the piston lock. This complex sequence of operations allows you to clamp the centrifugal mechanism to the crankshaft of the machine. The clutch is reassembled and tightened with the Allen wrench that is included in the chainsaw package. Clamping with a wrench should be done counterclockwise.

The last stage of the repair work is to install the remaining structural elements of the device.

When you’re replacing a chain saw sprocket, be sure to do so with care and attention. All repairs should be performed using special tools, otherwise you can cause damage to the centrifugal mechanism or saw chain.

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How to take a chain saw sprocket off?

Many tools need constant replacement of consumable parts. And that includes chain saws. That’s why the question of how to remove the chain saw sprocket, which is also often referred to as a clutch disc or centrifugal mechanism, is very popular with home masters. In this regard, it is necessary to discern what is called a sprocket and for what purposes it is needed.

The clutch drum, called the sprocket, is an integral part of the chainsaw.

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Chainsaw Clutch Replacement. Tips and video reviews

Failure of chainsaw clutch is one of the most common failures of this equipment.

The question of how to remove the clutch on the chainsaw at home correctly and not to harm the tool, think not only inexperienced technicians, and experts who have more than once made its repair.

In cases where the petrol cutters start badly, stall instead of starting check the clutch for malfunctions is mandatory, and recommendations regarding which will be presented next.

Chainsaw owners have probably wondered more than once how to change the clutch on a chainsaw? On most chain saw models the dismantling and clutch replacement can be easily done manually by the owner, on few models unscrewing the drum can only be done in the workshop (such chainsaws are for example Husqvarna 137 or Partner 351).

In this review, we will learn how to remove and change the clutch on a chainsaw yourself, when to do it and what tools you may need.

The chainsaw clutch drum is one of the most common consumables in a chainsaw, because it is the one that drives the cutting chain. There are two kinds of reels. with a welded sprocket and with a removable ring, and in the second case, only the removable ring will be worn, the drum itself will be replaced much less frequently.

Performing chainsaw clutch repair, adhere to the rule. when two chains are completely worn, the tire is replaced, when two tires are worn, the clutch drum is replaced.

The level of wear of the sprocket can be determined without special devices, it is enough to simply inspect it. the chain, moving at high speeds, over time rubs the teeth on which it moves. If the wear is severe enough, replacing the chainsaw clutch drum is inevitable.

In this article we will talk about Husqvarna 137 chain saw. Replacing the clutch drum is an uncomplicated procedure and takes place in a few steps.

  • First remove the tire and chain brake cover. The combination wrench that comes with the chain saw is a good way to do this.
  • Then remove the air filter cover, unscrew the spark plug, stop the piston of the Husqvarna 137 chain saw. For this procedure it is recommended to use a normal rope, because if you use a metal stopper there is a risk that the piston will be punctured.
  • On the clutch disc itself there are directions for removing it and two holes for the clutch puller.
  • Unscrew the clutch clockwise and remove it. Under the clutch plate there is a pressure washer that also has to be removed.
  • Under the clutch drum itself there is an oil pump with a washer, on which the new drum is installed.
  • The chainsaw is reassembled in reverse order, except for tightening the clutch disc. After threading the clutch, the piston must be re-locked to avoid deformation of the starter group, which is on the other side of the crankshaft.

Chainsaw clutch drum replacement is an essential part of maintenance, which will extend the life of all elements of the cutting equipment. Installation of a new cutting chain on a worn drum will lead to chain stretching after just a few seconds of work.

In turn, this will lead to a slight increase in the chain pitch, increasing the load on the bearing and sprocket on the bar itself.

So if you decide to skimp on timely maintenance, then be prepared for a much larger investment in a short period of time to buy all the consumables for your cutting equipment.

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Adjusting the ignition of the chainsaw Ural 2 electron. Specifications of the Ural 2T Electron chainsaw

When servicing clutches yourself, be aware that

  • Some saws have a washer between the sprocket and the clutch and between the sprocket and the motor. Keep this in mind when making repairs;
  • The special spring for the oil pump drive must not be damaged during disassembly and must be returned to its original position. Otherwise the chain will be under-lubricated or will cease to be lubricated at all.

A tool that has been repaired should be inspected to make sure the bolt ties are secure, the chain is lubricated and the motor is running smoothly (it should turn on smoothly and run smoothly). Only then can it be operated.

Repair of chainsaw clutch with your own hands is carried out only in special protective clothing: mask and goggles.

Main malfunctions, their causes and remedies:

  • If the chain train keeps turning when the engine is not running smoothly. It may be caused by a defective spring. In this case it is recommended to replace the damaged mechanism with a new one.
  • Noise in chain can be heard during movement. This problem may be caused by an overheated cam or a broken spring. Visually inspect the system and replace any worn out parts.
  • If the failure is due to the clutch slipping frequently, you need to replace the mechanism completely.
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In addition to the basic rules of operation described in the previous section, it is worth remembering some nuances when replacing the clutch. Use only original manufacturer’s parts. it is a guarantee of long and productive work of the tool. The clutch thread on all chainsaws of any manufacturer is always left-handed. Before removing the clutch, carefully remove all dirt and dust from the tool to prevent it from getting inside.

Husqvarna chain saw 137. Replacing the clutch drum

The chainsaw drum is one of the most common consumables on a chainsaw, because it drives the cutting chain. The drums themselves are divided into two types. with a welded drive sprocket and with a replaceable crown, and in the second case only the replaceable crown is worn, the drum itself is much less often replaced.

When repairing the chainsaw clutch, we follow the rule. when two chains are completely worn, the tire is replaced, when two tires are worn, the clutch drum is replaced. The wear level of the sprocket can be determined without special tools, just by inspecting it. the chain, moving at high speed, eventually wipes out the teeth on which it travels. If the wear is bad enough, the chainsaw clutch drum has to be replaced.

In this article we will talk about the Husqvarna 137 chain saw. Replacing the clutch drum is a simple procedure and takes place in a few steps.

  • First you need to remove the tire and the chain brake. Use the combination wrench that comes with the chainsaw to do this.
    Then remove the air filter cover, unscrew the spark plug, and secure the Husqvarna 137 chainsaw piston. For this procedure it is recommended to use a normal rope, as there is a risk of piston breakage when using a metal plug.

How to unscrew the clutch on a chainsaw

The clutch and reel removal procedure is quite simple and takes about 1 minute with a trained hand. If you know the nuances and prepare in advance, there will be no problems, but with a spontaneous approach, the procedure is significantly delayed, if not thwarted at all. The following instruction, clearly and step by step, demonstrates how to disassemble the clutch on a chainsaw in different ways, using the available tools.

The first and easiest step is to remove the guide bar cover by unscrewing the two nuts with the hex key provided with the chain saw. The guide bar and the chain are also removed (if fitted).

If the drum is located on the outside, to remove it, it is enough to remove the retaining ring. This operation is more convenient to perform with the slotted screwdriver.

Since the overrunning clutch is secured to the shaft, any attempt to unscrew it will only cause the parts to rotate. The position of the crankshaft must be secured by inserting a stop for the piston through the spark plug hole. As a stopper, you can use special devices, which cost from 200 If there is no possibility and desire to spend time looking for such a stopper, you can always put in the combustion chamber of the usual rope with a knot.

After fixing the position of the shaft, you can proceed to unscrew the clutch. Usually there is no convenient nut for a ring spanner, and disassembly involves using a special puller. Cost of such devices starts from several hundreds and often exceeds the cost of the clutch itself.

As an alternative, you can use the key from the angle grinder or rip with a hammer, using a chisel. Alternatively, it is possible to use a chainsaw bar by putting 2 short bolts through its holes and tightening them with nuts on the back side of. You can make a homemade clutch puller, marking and drilling in a sheet of metal (4 mm), the corresponding grooves in which to pass and tighten the screws. In general, there are many sophisticated ways to “hook” the clutch without excessive cost. Some people use a wrench or pliers to undo the threads.

It should be clarified that for the reliability of attachment of the clutch, on the threads of the shaft is applied retainer, which connects these elements extremely strong. It can be quite difficult to break such a clutch, even with a handy stop. To make disassembly easier and to protect the piston and the rest of the mechanism from damage, heat the threads with a gas torch or construction dryer. The high temperature will loosen the threadlocker’s adhesive properties, making it much easier to separate the parts.

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Having unlocked the overrunning clutch continue unscrewing in clockwise direction (left-hand thread).

Under the clutch, on the shaft there may be a large metal washer separating the components (not on all models). Remove it, followed by the needle bearing drum. The clutch is removed.

If the above guide, did not fully convey the essence, reinforce the acquired knowledge with a visual demonstration of the entire process. The following short video guide, with helpful Комментарии и мнения владельцев by the author, will explain in detail how to remove and repair the chainsaw clutch with your own hands, with minimal time expenditure.

The description of the clutch removal process can be called universal, applicable to all modern models of saws. As mentioned above, the main design difference can be seen in the location of the sprocket, which is usually located inside (between the clutch and the crankcase), but can be installed and outside (this is much easier to change). Otherwise, if you want to understand how to remove the clutch from a Partner or Husqvarna chainsaw, it is sufficient to read the above instruction, reflecting all the steps in the process. Smaller nuances specific to certain models (air duct cover fastening, chain tensioner) usually don’t cause difficulties and are easily solved by yourself or with the help of technical documentation.

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Constructional problems of different models

The problem is complicated by the design of brand-name chainsaws, which stipulate that the worn actuator can be replaced only after the complete dismantling of the clutch mechanism and other components. Alternatively, in order to remove the sprocket from the chainsaw, it is necessary to have a special wrench.

A design feature of a lot of chainsaw imports is the placement of the sprocket on the clutch mechanism.

  • If the teeth are significantly worn, the drum, which is in one piece with the drive, must be replaced.
  • advanced design of the drive sprocket allows you to restore the performance of the part by replacing the ring gear.

In the list of the factory kits supplied with the saws, such a tool is very rare. Have your STIHL chain saw replaced at a STIHL repair shop or have a tool made at home to take care of the problem.

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Peculiarities of chainsaw designs

STIHL chain saw for professionals

There are already dozens of chainsaws by different manufacturers, capacities and, most importantly, special applications in operation. Divide saws into:

Accordingly, the drive gear in them will be different, as well as the sequence of actions. This is a feature of saw gear units. With most professional tools, the bar can change its position on the saw in two planes.

You may also be interested in the article, sharpening the chainsaw chain with your own hands.

The main malfunctions of chainsaws and actions to fix them, described here.

Drive sprocket for chainsaw

The chainsaw drive sprocket, or clutch plate, serves to transmit rotary motion and power to the saw chain. There are three types of drive sprockets;

One-piece sprocket. In such a sprocket, the clutch plate is rigidly welded to the drive sprocket. If worn, the entire sprocket is replaced.

The sprocket is collapsible. The sprocket is a clutch plate with slots that fit the drive sprocket on the ring. The clutch plate wears very little and replacement crowns are cheap. The collapsible sprocket is very advantageous for larger workloads and is used mainly by professionals.

Replacement Crown Sprocket. This sprocket is used to replace the sprocket on collapsible sprockets.

You must choose your drive sprocket by the chainsaw model. If you have any doubts, give us a call. We will try to recommend the right replacement part.

Clutch repair: the nuances of the process

When servicing clutches yourself, you need to know that:

  • Several saws have a washer that is located both between the sprocket and clutch and the sprocket and motor. Keep this in mind when repairing;
  • The special spring of the oil pump drive must not be damaged during disassembly, and can be returned to its original position. Otherwise, the chain will not receive enough lubrication, or at all will cease to be lubricated.

A tool that has been repaired should be checked to make sure it has secure bolt ties, lubrication of the chain, and the motor is running smoothly (it should turn on smoothly and run smoothly). Only then can it be operated.

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