How to Remove a Sprocket from a Partner Chain Saw

Replacing the sprocket

Before replacing it, you need to prepare, gather the necessary tools, buy the parts you plan to change.

When buying a new sprocket, do not rely on the size of the part, but on the model and brand of your chainsaw, otherwise the part might not fit!

Needed tools

  • Quality saws from reputable manufacturers come with a special wrench to remove the pinion. Unfortunately there is no such key in cheaper tools.
  • Candle wrench.
  • For saw models not equipped with their own wrench, a copper or aluminum hammer is used.
  • Hammer (for unscrewing the sprocket with a punch).
  • Flat-tipped screwdriver.
  • Lubricant for the bearing.

When the necessary tools are prepared, you can proceed to replace the part. It is worth noting that there are peculiarities of the sprocket replacement on different brands of saws.

Step-by-step replacement procedure on any chainsaw

At this stage of tool maintenance, the non-disassembled device can be replaced with a prefabricated mechanism. This will simplify the process of replacing the sprocket in future use.

Then we repeat the whole algorithm in the reverse order to assemble the chainsaw. In the case of a collapsible-type product, only the crown, without the drum, is eventually replaced; the process is otherwise identical.

Now let’s look at the algorithms for replacing the sprocket on different models of saws.


Replacement on the Husqvarna 137 (Husqvarna 137)

  • Using the wrench included in the kit, remove the bar cover and the chain brake
  • Remove the cover from the air filter
  • Unscrew spark plug and lock saw by immobilizing piston (you better use rope for this, metal plug can puncture piston)
  • Insert screwdriver in special groove for unscrewing clutch and with a sharp blow break the thread.

Replacement on ECHO saw (Echo CS-3500)

  • First of all we have to remove the saw headset: use the included Allen key to unscrew the nuts and bar covers.
  • Remove the bar, then the chain.
  • Remove the air filter cover.
  • Remove the spark plug.
  • Fix the piston in the cylinder with a stopper instead of the removed spark plug.
  • Included with the saw should be a puller, which must be installed in a universal wrench. With its help we unscrew the clutch clutch and remove it.
  • Replace the drum or crown and check the cage.
  • Reassemble in reverse order.


Replacement on Partner 350 saw (Partner 350)

  • Open side cover to access sprocket and guide bar.
  • Remove the bar and loosen the chain.
  • Unscrew the spark plug to reach the piston with a spark plug wrench.
  • Rotate the sprocket until the piston is almost at the top, stop it and secure it with rope.
  • Use the wrench that comes with the kit to remove the reel.
  • Replace necessary parts and reverse order to reassemble the saw.

Replacing on the STIHL 180 (STIHL 180)

On a German chainsaw, the process of removing the drive sprocket is very simple and consists of the following steps:

  • Remove the guide bar cover.
  • Remove guide bar and saw chain.
  • Remove retaining ring.
  • Remove the locking washer.
  • Remove the drive sprocket.
  • Remove needle bearing for lubrication.
  • Replacing parts with new ones.
  • Reassembly.

Before you test these algorithms in practice, make sure you really need to replace the sprocket.

Most Chinese chainsaws have a clutch design similar to the Husqvarna, so it’s rare to find a sprocket that looks like the one on a Stihl. The above described procedure is applicable to most STIHL chain saws, especially the household and semi-professional chainsaws.

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In the photo next to the saw are: the drum, the bearing, the lock ring, the washer, as well as the clutch clutch on the saw itself.

What tools do you need to replace the sprocket?

To replace the drive (drive) sprocket you will need the following tools and accessories:

How to change the sprocket on a chainsaw with no effort or fuss

  • A special key for removing this part (it is usually supplied with the expensive brand-name chain saws, cheap saws do not have such a key);
  • A chisel made of aluminum or copper (only soft metals and only if there is no wrench);
  • hammer (for hammering the chisel in the process of unscrewing the sprocket);
  • a flathead screwdriver to tighten the nut;
  • Sprocket bearing grease.

How to reduce wear on the drive sprocket?

Chain saw clutch life can be increased by regular maintenance and good tool service. Helpful hints

  • Apply grease to the needle bearing after each sprocket change;
  • Choose all the parts of your saw chainring correctly, depending on the pitch of the chain, use reliable consumables;
  • do not replace clutch and saw parts at the same time. this leads to a change in pitch, wear on the headset;
  • clean the duster regularly by removing the side cover.

Changing a chainsaw sprocket. This is a common procedure that will keep the tool working reliably and consistently. When diagnosing or repairing the clutch mechanism, consider the design features of the model, the manufacturer’s requirements. To avoid frequent breakdowns it is recommended to use only original parts or high quality analogues and to clean the chainsaw systematically.

Why a chain sprocket needs to be replaced

Among the most common reasons why a tool may need to be repaired is to replace the drive sprocket. The part becomes unusable because of:

  • chain jamming if a defect occurs while the machine is in use;
  • High sprocket wear if the chainsaw is used a long time.

Regular use of the tool causes increased wear of the part due to the impact of the increased load when cutting wood materials. There are several ways of using the tool:

When using the tool for the first time, the saw is used until it is completely worn out. This method has certain disadvantages, among which is the problem of carrying out manipulations that control wear and tear as a result of intensive operating activities.

With two or more chains, you can get even wear on each chain and sprocket, which will greatly prolong machine operation and reduce the need for frequent drum changes. In addition, it is important to keep in mind the condition of the bearing in the drum. Operation of this structural element occurs at any engine revolution. When replacing a sprocket, it is also important to take care of replacing the bearing and clutch.

Untimely repair contributes to the occurrence of increased vibration, which affects the increase in the indicators of wear of parts that are installed in the engine of the device on the crankshaft half-axle. The depth limit value for sprocket teeth wear should not exceed 0.5 mm. Sprockets have twice the service life of the chains. In this connection it is recommended to use two chains.

When the resource of each chain is exhausted, it is necessary to replace the chain and the drive sprocket at the same time.

Alternative Solutions

The drive designs of the majority of chainsaws in the domestic and semi-professional segments of the market are fundamentally similar. The sequence of operations required to remove and replace the drive pinion is the same.

As mentioned before, the best option is to buy the standard repair kit for this model.

The advantage will be the presence of the set and the bearing. You should also check to see if there is a drum puller designed for the particular saw, as well as a retainer to hold the piston in a certain position.

If you still have an ingenious idea to “improve” or modernize this node of the chainsaw, it is better to consult with experts and just with experienced people.

Design features and functions

The chain drive sprocket is functionally aligned with the clutch drum with spring-loaded cams inside. The peculiarity of the construction device is that the motor shaft passes and freely rotates inside the clutch drum. The expander cams are permanently fixed on the end of the shaft.

When the saw is idling, the cams are compressed by a spring and do not touch the drum. As RPM increases, centrifugal force exceeds the stiffness of the spring and the cams contact the side of the reel. The latter begins to rotate.

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The teeth of the saw chain are in mesh with the teeth of the drive sprocket. One of the functions of the automatic centrifugal clutch is to protect the motor when the chain load exceeds the permitted limit. It can be caused by a jammed chain.

The outer drum is wrapped around the emergency brake band. When the crank is pulled back, the belt is pressed against the drum and brakes the rotation. The effect is the same as a seized chain.

A feature of all chainsaws is that the drum and clutch cams are attached to the shaft with a nut with a left-hand thread, so that the mechanism does not unscrew during operation.

How to remove the drive sprocket on a Husqvarna chain saw

Chainsaw chainring transmission of any design determines the performance of the tool. In addition, the chain will stretch during operation and the teeth of the drive sprocket will wear out. Improper sprocket selection will greatly reduce the durability of your chainsaw’s teeth, and improper adjustment will result in premature wear.

A little about the rules of the node

Regardless of the brand of the manufacturer (Shtil, Husqvarna, Partner, Patriot, Makita) chain saws are divided into home, semi-professional and professional. The difference, however, is not in the quality of assembly or workmanship of the components, but in the class of tasks to be performed, performance and long term power of the drive. This determines the choice of material for the chainsaw drive sprocket, its design and the design of the saw chain.

The performance of the tool will be determined by how the sprocket chain works. In most cases, users use one of the two options:

remove, sprocket, partner, chain
  • The chain works until the teeth are completely worn, and then both the saw blade and the sprocket are replaced at the same time;
  • Periodically replacing the chain with a different pitch, and each one will require its own sprocket.

The choice of option is often determined by the owner’s attitude toward their tool. If this is all the same as sawing (wood or stuck steel staples, screws, etc. Д.), then you can opt for the first option. However, the chain will have to be periodically adjusted, thereby reducing the performance of the chainsaw.

It is strictly recommended not to leave the old chain with the new sprocket and vice versa. When the saw is worn, the likelihood that the tooth pitch is off is virtually 100 percent. Therefore, both chain drive components will be subjected to significant dynamic loads at the initial start-up. As a result, either the chain is stretched prematurely, “adjusting” to the sprocket, or if one of the teeth on the drive sprocket breaks.

READ Chain don’t lubricate on STIHL 180 chainsaw

You should also pay attention to the operation of the drive sprocket shaft bearing. When the saw is running at operating speed, only the crankshaft rotates. But all chainsaws periodically run and idle when the bearing rotates. In the absence of lubrication, wear of the seat occurs, and as a consequence, additional tooth beating is still a workable chainring.

How to change the sprocket on a Husqvarna

Husqvarna chain saw, I will show you in detail and step by step how to.

Quick Repair Husqvarna 137/142. Changing the Oil Pump.

Quite a common problem with Husqvarna chain saws

137 и 142. Oil Pump Breakdown. This video shows a quick.

It follows that when replacing the chain and drive sprocket for a chainsaw, it’s also a good idea to replace the bearing at the same time.

Constructional features of drive sprockets

Any manufacturer specifies the tooth pitch in the instruction manual. Given the fact that the saw blade also has a driven sprocket (designed to create the necessary tension), the pitch should be the same as there.

Chain drive sprockets can be solid and prefabricated. In the first case, the sprocket includes a hub, on which the tooth crown is pressed. This is how the parts in chainsaw chains are arranged. Remove when you completely replace the product, because at home, to make sure the tightness value set at the manufacturing plant is nearly impossible. And buying a crown separately is also a problem.

In chain saws from Stihl or Husqvarna, the replacement crown is located directly on the drum shaft and is therefore not difficult to replace.

Tooth wear is determined by the following features:

  • There are well-defined radii at the transition from tooth to cavity.
  • The width of the tooth is uneven in height.
  • There are metal chips in the top part of the tooth.
  • There are many scratches and marks on the inside surface of the hub bore (caused by poor lubrication).
  • There is a notch in the sprocket from the saw blade (the chain should also be changed).
  • The chain is jammed at the starting point.
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If at least one of these factors is present, the drive sprocket must be replaced.

Before starting work (especially if the chainsaw is relatively little used), it is worth checking that the saw blade is locked in place. The screw tensioner is tightened or the fastening nuts are loose. The guide bar is no longer aligned with the longitudinal line of the saw blade. It begins to contact not the center, but the periphery of the drive sprocket teeth, causing heavy wear on them. After tightening the above-mentioned elements, check the chain saw’s operation: if the play is not eliminated, the sprocket should be changed.

How to remove the drive sprocket from a chainsaw?

As noted, the sprocket can have a separate and pressed crown. Consequently, the sequence of operations will be different.

For the stationary located corona, the following are performed in sequence:

DIY How To Remove Chainsaw Clutch without Specialty Tools. Saw Repair. Poulan Husqvarna Stihl Echo

  • Dismantling the housing;
  • Removing the saw blade together with the chain;
  • Disconnecting the clutch from the engine (lock the piston beforehand);
  • Remove the coupling along with the drum;
  • Remove the crown from the drum using a regular carabiner wrench (some manufacturers also attach a puller to the Zip kit).

Reassemble the assembly in reverse order. For some models, you’ll need to remove the air filter before removing the crown.

When disassembling the drive sprocket for a chain saw with a replacement crown, the work order will be almost the same, but in the final stage only the crown needs to be replaced.

After completing the work, it is necessary to check the effectiveness of the replacement. To do this, check the chain tension: if the brake is released and tries to pull the chain in its direction of travel, the chain is stationary, then the fastener is “tightened” and the tensioner should release slightly.

Successful work is determined by the presence of a special repair kit, purchased for a particular brand of chainsaw. Otherwise you have to know exactly what size and tooth pitch you need.

It makes sense to replace worn-out parts in the chain drive system in good time

The design of its crown determines such an important parameter as the choice of chain pitch.

  • Installation of a new part on a worn sprocket reduces the smoothness of its movement, accelerates wear, initiates the risk of breaking and creating an injury situation.
  • There is also an increase of operating loads on the motor and the kinematic elements of the tool.
  • A similar process occurs when installing old sprocket chains on a tire, the diameter of which is adjusted to the size of the tire by removing some of the links.

Experts also advise not to arbitrarily change the size of the sprockets. Experimentation can have a negative effect on motor life and tool kinematics in general.

Safe sawing operations of varying degrees of difficulty are ensured by an effective emergency stop brake and devices to block the chain ends from flying off in the event of accidental breakage. In any case. the most reliable prevention of abnormal situations, keeping the chainsaw in good technical condition.

Chainsaw clutch: repair and replacement of the clutch

This part is responsible for the transmission of torque from the engine crankshaft directly to the saw headset. Accordingly, if the clutch is out of order, the sawing process becomes impossible. Let’s say at once that this breakdown sooner or later occurs on any chainsaw and in the vast majority of cases is the result of natural wear, the consequence of more or less intensive use of the tool. Clutch failure can manifest itself in different ways:

remove, sprocket, partner, chain
  • in one case this is indicated by a constant rotation of the saw chain, even at idle engine speed;
  • in another case, on the contrary, the chain stands and does not rotate when the engine rpm increases.

Both of these cases are indicative of a chainsaw clutch malfunction.

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