How to disassemble a shimano bike ratchet

Removing the ratchet from the bike

It is not always possible to correctly see the malfunction when the ratchet mechanism on the bike itself is not always possible, so the best solution would be to disassemble it.

It will not be possible to remove the ratchet mechanism just like that, so we need a special tool. a puller. With this simple device, the ratchet will quickly be removed from its rightful place.

Tool for removing and securing the ratchet

Before proceeding with the repair of the ratchet, it is necessary to correctly determine in which direction to unscrew the nut. It is not necessary to lean heavily to one side or the other, otherwise the thread of the sleeve can be rolled up. If the thread is right-handed, screw it up counterclockwise, and put it on clockwise.

Behind the nut is a row of balls, which can themselves fall out of the mechanism. They must be carefully removed, cleaned of dirt and set aside. The disassembled device is cleaned of excess grease and foreign particles with gasoline or thinner.

The same goes for transmission stars. If the stars of the entire system are not worn, and the problem is in the threaded ring, it should be pulled out of the drum and replaced. Along the way, the dog and the spring are changing.

After the bulkhead, the ratchet is put back on the rear wheel hub. To do this, you need to carefully place the bearing balls in their seats, firmly install the mechanism and tighten with a wrench on the bushing. If the ratchet does not work and there is an overshoot of the chain at idle, most likely a new part is needed.

  • Remove the old mechanism. This will not work without a puller, do not forget a special key.
  • Inspect the rear hub axle.
  • Mount the new part on the bushing.

It is recommended to hang a new chain together with the ratchet so that there is no imbalance between the new sprockets and the worn chain. It is also useless to put the part on the damaged axle of the bushing itself.

If the output of the transmission mechanism is too high, it will be rational to supply a new spare part. In most cases, the problem of malfunctioning ratchets is solved by a simple bulkhead and cleaning from dirt. Finally, do not forget to lubricate the newly assembled parts.

Installing a new cassette

Slide the new cassette onto the hub, making sure that the cassette you are purchasing is compatible with your hub. For convenience, there are channels on the cassette body, and on the sleeve there are grooves corresponding to them, so that in principle you cannot install the cassette incorrectly. The largest gear should be closest to the spokes, with all wheels facing the beveled surface outward.

Make sure that the washers, sold with the cassette, are installed between all cassette wheels. After assembling the cassette, make sure that the distance between all wheels is the same and that the smallest wheel protrudes slightly from the hub body. Otherwise, you are most likely to have missed one of the pucks.

Reinstall the eccentric mount with springs, put on the wheel and, just in case, check the operation of the mechanism when shifting to all available gears.

Varieties

Bicycle cassettes have several varieties, which are based on a different way of connecting the stars to each other and on the drum:

  • Spacer. It consists of stars, between which there are plastic spacers (spacers) with a set thickness, to maintain the same distance. And where each star is attached by separate slots to the drum. In such a device, the load when cycling is transferred directly to the drum, which is considered a disadvantage;
  • On a spider. It has a common connection in the form of a spider, where on the foot in the form of a ladder there is a corresponding mount for a star of the required diameter. The spider is hollow and usually made of aluminum. Therefore, such a device gains weight and is placed on drums made of aluminum. Since in places of increased load, soft aluminum should not come into contact with stronger steel;
  • Blocky. This variety stands out for its design, in which there are spiders on which medium and large stars are worn. Smaller ones are installed separately on the drum slot, as they can quickly become unusable and it was possible to replace each one;
  • Solid milled. They are made as a solid block, where the lower sprocket acts as a slot for the drum. The design is durable, lightweight, does not have additional fasteners. But with all the advantages, there is also a significant drawback. compared to the rest of the cassettes, it has the highest cost.

Benefits

Such vehicle options are less practical and less efficient to use, because they are equipped with fewer gears, and are also not efficient in the process and are unreliable. During the occurrence of any unforeseen situation (hitting a hard surface or a pothole), the rear wheel hub can be broken. If the bike is equipped with cassettes instead of ratchets, then such situations occur less often. The cassette is easier to maintain and operate than a ratchet. The worn-out part of the first version will allow not changing the whole set of stars, but only identifying a single spoiled one. In the version with a ratchet, it is impossible to replace a separate star, since all the parts are tightly connected to each other.

As for the advantages of a ratchet, these are:

  • more affordable cost than cassettes;
  • ease of installation;
  • availability.

The design of both systems has nothing in common, that is, if there is a desire to change your old bicycle ratchet, and the modern cassette, then you will not be able to do this. To carry out the replacement, you will have to completely change the rear wheel hub. A bicycle with cassettes is more practical to use, since it has the maximum number of gears at its disposal, which cannot be said about a ratchet. The number of teeth on the smallest cassettes is about 11 or 12 pieces, on the ratchet. 14.

Removing the ratchet from the bike

It is not always possible to correctly see the malfunction when the ratchet mechanism on the bike itself is not always possible, so the best solution would be to disassemble it.

It will not be possible to remove the ratchet mechanism just like that, so we need a special tool. a puller. With this simple device, the ratchet will quickly be removed from its rightful place.

Tool for removing and securing the ratchet

Before proceeding with the repair of the ratchet, it is necessary to correctly determine in which direction to unscrew the nut. It is not necessary to lean heavily to one side or the other, otherwise the thread of the sleeve can be rolled up. If the thread is right-handed, screw it up counterclockwise, and put it on clockwise.

Behind the nut is a row of balls, which can themselves fall out of the mechanism. They must be carefully removed, cleaned of dirt and set aside. The disassembled device is cleaned of excess grease and foreign particles with gasoline or thinner.

The same goes for transmission stars. If the stars of the entire system are not worn, and the problem is in the threaded ring, it should be pulled out of the drum and replaced. Along the way, the dog and the spring are changing.

After the bulkhead, the ratchet is put back on the rear wheel hub. To do this, you need to carefully place the bearing balls in their seats, firmly install the mechanism and tighten with a wrench on the bushing. If the ratchet does not work and there is an overshoot of the chain at idle, most likely a new part is needed.

  • Remove the old mechanism. This will not work without a puller, do not forget a special key.
  • Inspect the rear hub axle.
  • Mount the new part on the bushing.

If the output of the transmission mechanism is too high, it will be rational to supply a new spare part. In most cases, the problem of malfunctioning ratchets is solved by a simple bulkhead and cleaning from dirt. Finally, do not forget to lubricate the newly assembled parts.

The bicycle ratchet, popularly also known as the nut, is a ratchet mechanism that allows you to reliably transmit torque through the chain from the pedals and at the same time coast freely without the need to pedal continuously. This mechanism is assembled as a single piece with the rear wheel hub. Consists, in fact, of the ratchet itself in the form of a toothed drum with two pawls and a non-separable cassette of sprockets.

Simple maintenance of the bike transmission boils down to cleaning it from dirt and grass that gets clogged between the sprockets.

You will need to remove the ratchet from the bike in the following cases:

  • To adjust the tightening of the rear wheel hub bearings. You can not remove anything, but with the cassette of sprockets unscrewed, it is much easier to remove the ball bearings, determine the degree of wear of the cup, lubricate the assembly.
  • If possible, to replace broken dogs. Although such small parts are not sold individually, and most often you will need to buy the entire assembly, they can be removed from the old ratchet. Unfortunately, there are times when, as a result of the premature death of the dogs, the drum with asterisks either gets jammed, or it starts to rotate freely in both directions.
  • When the teeth of the smallest stars are worn out to the extreme or if one of them breaks.
  • To install the spoke into the rear wheel hub on the right side, to replace the broken.

Cassette and Chain Care

Thoroughly clean the cassette at least twice a year. Do not spill water on the bushing and do not use a solvent, as this can wash away the bearing grease.

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When replacing the cassette, it is also advisable to replace the chain. It wears out faster, and you will probably have time to change the chain a couple of times before changing the cassette for the first time. But remember that the chain and cassette must be compatible with each other. For example, for a 9-speed cassette, a 9-speed chain will work only.

Tricks To Remove & Service Shimano Deore Freehub Body. Clean, Grease, Assemble.

Note that using a worn chain will cause premature wear on the cassette teeth. This is especially true for regions with high humidity or sandy areas, since the ingress of water, dirt and sand into the transmission significantly reduces the service life of its components.

How to choose a cassette, read the article Bicycle cassette: selection and maintenance

Cassette

The ratchet is located inside the hub drum, and the set of stars is attached to the drum using splines. That excludes the possibility of interchange of systems without replacing the sleeve. This system has a number of advantages and variations in manufacturing principles. Unlike the competitor, the bearings are at the same distance from the axle and do not exert pressure on it.

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disassemble, shimano, bike, ratchet

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Diagnostics and care:

  • Tighten the wheel hub bearings. In principle, you can not remove the mechanism itself, but the bearings are easier to remove when removing the entire device, they are quite small, it is very difficult to remove them.

Removing the ratchet

To remove the ratchet, it is enough to have a special puller. It looks something like this:

In my case, this is a ratchet remover from the Birzman company

Please note that there are cassettes and ratchets on bicycles. These are two different things! They need different pullers. What is the difference between a ratchet and a cassette. read here.

If you have the necessary tool, then further actions are a matter of technique.

It is necessary to insert the puller into the recess of the ratchet and unscrew it counterclockwise. This is where the first difficulties may arise, since the puller requires a large wrench or head. My puller is unscrewed with a key 21.

When I rushed to look for a key, I didn’t have one. I had to be smart and get into the car, where the wheel wrench was taken, which fit perfectly. Then the ratchet was unscrewed.

The ratchet stars are not visible in the photo, since I removed them (see below how I did it). Do NOT remove the stars to remove the ratchet.!

Since the ratchet twists when operated by the cyclist’s feet, it is often difficult to unscrew it back. In 80% of cases, you have to use additional leverage. I am using an old seatpost paired with a wheel wrench.

What is a ratchet?

Ratchet is a ratchet mechanism consisting of a freewheel, sprockets and a threaded ring. The design transfers rotation from the pedals to the wheel through the chain, while simultaneously allowing movement without the need to pedal. It is screwed onto the threads of the axle of the rear hub of the bicycle. If the sprockets wear out, they unscrew and change completely to new ones.

Cassette and ratchet should not be confused. In modern bicycles, they began to use a cassette. a device that is more advanced than a ratchet. The design consists of stars assembled together, which are put on the sleeve and secured with a nut, and the holes in the middle are equipped with grooves with which it clings to the drum. Inside the drum there are pawls, springs and a ratchet. It is easier to remove the cassette and replace the unusable sprockets with new ones. It can be easily dismantled in any conditions, and the removal of the ratchet is best done on a workbench. This requires not only a special tool, but also significant physical effort. The impossibility of repair is its main drawback. Plus a small number of stars and fragility.

It just works. The system has a pawl that engages the rear of the transmission mechanism, at which time a slight crackling sound is heard. From this cod comes its name. If there is no sound, it means that it will pull the chain forward when the pedals do not rotate.

How to disassemble the ratchet?

To repair the ratchet with your own hands, you need a hammer and center punch. Instead of a center punch, you will need a large nail or self-tapping screw. It is better to disassemble the device on a wheel so that you can hold it.

  • The ratchet spins on the wheel. A center punch is inserted into the hole on the nut, and by turning clockwise with a hammer, the mechanism is disassembled.
  • The stars are removed with a puller and a key. There are balls inside under the nut. There is also a second ball track on the wheel.
  • To prevent the balls from scattering, you must put a rag or box.
  • The smallest asterisk is unscrewed counterclockwise. The rest are just filming.

Now you need to look at the condition of the mechanism, pawls and lubrication. Dogs wear out most often. They can be replaced. A special repair kit made of dogs and rings is produced. Be sure to wash the ball bearings. If the balls are black and there are frayed metal particles, then the bearings have broken. Each one needs to be examined. If there are dents on them, then it is recommended to replace them.

Next, we collect all the parts in reverse order. The flare nut must be tightened with force, and the play for the sprockets relative to the wheel should be adjusted with inlaid, thin rings.

Thus, it is much cheaper to repair the mechanism with your own hands and does not take much time and effort. And it is necessary to perform such actions regularly so that cycling is pleasant and safe.

My VK https://vk.com/id263241899 The size of the balls in the ratchet is 3.2mm Useful videos from my channel about bike repair. 1) Rear wheel hub service.

  • My VK vk.com/id263241899 The size of the balls in the ratchet is 3.2mm Useful videos from my channel about bicycle repair. 1) Rear wheel hub service. tvclip.biz/video/xUPosWduKeQ/video.html 2) Front wheel hub service. tvclip.biz/video/Rm1Eiu-0VQ4/video.html3) How to fix, align the figure eight on the bike wheel tvclip.biz/video/4hLX9zlg-hw/video.html4) Brakes v brake setup, how to adjust and install on the bike tvclip.biz /video/JMjIyswdeKs/video.html 5) Solid oil and lithol 24 can be used to lubricate the bike or not. tvclip.biz/video/UHLT-emvXng/video.html6) KT-305 how the hub with a foot brake works, maintenance, mechanism device. tvclip.biz/video/RYPA-kUBDcc/video.html7) Backlash and shake, the rear or front wheel spins, how to fix it. tvclip.biz/video/6MGTZxuNr_s/video.html 8) Replacing and adjusting the rear crossover tvclip.biz/video/MSf3KCkxLXc/video.html 9) Adjusting the front crossover of the bike tvclip.biz/video/bKvnDcujDRg/video.html 10) How to soften the fork on bike. tvclip.biz/video/dhNAGnITNbs/video.html 11) sr suntour XCT plug restoration and repair tvclip.biz/video/xtkmw57stZo/video.html 12) Simple spring bike fork repair tvclip.biz/video/GDIhFqT478k/video.html 13) Replacing the carriage on a bicycle, how to remove the connecting rods, how to remove the carriage, how to disassemble the carriage. tvclip.biz/video/jUHX5yEjlgg/video.html14) Bicycle rear sprocket ratchet, how to disassemble the ratchet. tvclip.biz/video/uVSXTTea5M8/video.html15) Chain length, how to determine the length of the chain, remove and tighten the chain on the bike. tvclip.biz/video/8O43SJx_SyU/video.html16) How to disconnect, rivet, bicycle chain. tvclip.biz/video/TwOJQMli3zY/video.html17) How to use a squeeze for a bicycle chain, a secret. tvclip.biz/video/myRb_vhrVZQ/video.html18) How and how to paint a bicycle frame made of aluminum or stainless steel at home. tvclip.biz/video/hC2JfecGOtc/video.html 19) Replacing the front fork of the bicycle tvclip.biz/video/i-FZYG-MoUY/video.html20) Squeaking, crunching and knocking on the pedals and the carriage of the bicycle, how to fix. tvclip.biz/video/DM7Y2LfZCCc/video.html21) How to disassemble and assemble the bottom bracket on a bicycle, replacing bearings. tvclip.biz/video/w5kpzDlSNHo/video.html22) Repair, disassemble bicycle pedals. Installing how to remove the pedals from the bike. tvclip.biz/video/Dy4FljsBKTI/video.html23) How to Calculate Bicycle Spoke Length, Spoke Calculator. tvclip.biz/video/mzp9m-4oijc/video.html24) How to latch, replace, spokes on a 36-spoke bicycle wheel. tvclip.biz/video/K2edaZyOePM/video.html25) How to replace or install brake pads on bicycle disc brakes. tvclip.biz/video/aZ4uJqOFue4/video.html26) Shimano Tourney rear crossover repair, restoration. tvclip.biz/video/W0Vf4JqH30o/video.html27) Shimano rear crossover sis. repair, restoration. tvclip.biz/video/1b_O02HIufc/video.html28) How to learn how to ride a bike independently for an adult and a child. tvclip.biz/video/xIP00mBnxnk/video.html29) BOLI and FLAME disc brakes, installation, setup and adjustment. tvclip.biz/video/7a7H8ymR-7o/video.html30) Backlash, ratchet rear sprocket on a bicycle, how to remove, what is the reason. tvclip.biz/video/OaCk3Jfe698/video.html
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My VK The size of the balls in the ratchet is 3.2mm Useful videos from my channel about bicycle repair. 1) Rear wheel hub service. / 2) Front wheel hub service. / 3) How to fix, align the figure eight on a bicycle wheel / 4) Brakes v brake setting, how to adjust and install on a bicycle / 5) Solid oil and lithol 24 can be lubricated on a bicycle or not. / 6) KT-305 how the hub with a foot brake works, maintenance, mechanism arrangement. / 7) Backlash and wobble, rear or front wheel spins, how to eliminate. / 8) Replacing and adjusting the rear cross-over / 9) Adjusting the front cross-over of a bicycle / 10) How to soften the fork on a bicycle. / 11) Forks sr suntour XCT restoration and repair / 12) Repair of a simple spring fork of a bicycle / 13) Replacing the bottom bracket on a bicycle, how to remove the connecting rods, how to remove the bottom bracket, how to disassemble the bottom bracket. / 14) Bicycle rear sprocket ratchet, how to disassemble the ratchet. / 15) The length of the chain, how to determine the length of the chain, remove and tighten the chain on the bike. / 16) How to disconnect, rivet, bicycle chain. / 17) How to use a bicycle chain squeezer, a secret. / 18) How and how to paint a bicycle frame made of aluminum or stainless steel at home. / 19) Replacing the front fork of the bicycle / 20) Squeaking, crunching and knocking on the pedals and the carriage of the bicycle, how to fix it. / 21) How to disassemble and assemble a carriage on a bicycle, replacing bearings. / 22) Repair, disassemble bicycle pedals. Installing how to remove the pedals from the bike. / 23) How to calculate the length of a bicycle spoke, spoke calculator. / 24) How to spoke, replace, spokes on a 36-spoke bicycle wheel. / 25) How to replace or install brake pads on bicycle disc brakes. / 26) Shimano Tourney rear crossover repair, restoration. / 27) Rear shifter Shimano sis. repair, restoration. / 28) How to learn to ride a bike independently for an adult and a child. / 29) BOLI and FLAME disc brakes, installation, tuning and adjustment. / 30) Backlash, ratchet rear sprocket on a bicycle, how to clean, what is the reason.

A ratchet is a unit that includes a drum on which a cassette with stars is put on, a ratchet base that is screwed into the body, pawls with a spring and ball bearings, thanks to which the drum has the ability to rotate on the ratchet base when it is free running. Sometimes a ratchet on some forums is mistakenly, it seems to me, called a nut, tk. Walnut looks more like a removable cassette with stars, put on a drum.

Nut. a part of the ratchet base that serves as a support for the main right bearing of the bushing, i.e. bearing carrying the weight of the bike.

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Hub housing. anything not ratchet and main bearings

A sledgehammer is an old Russian universal tool for disassembling machine parts. In the context of the article. a hammer weighing about 200 g

Used tools and materials: 1. Sledgehammer 2. Hexagons 2 and 11 (11 is made from factory hexagon 12) 3. Special key made of steel strip 300x29x4.5 mm (LxWxT). I used tough stainless steel, but black steel will work. 4. Bench vise (not pictured)

We take out the axle and bearings 1. Remove both locking bosses from the axle, having previously unscrewed the 2 set screws with a hexagon.

Slightly tapping with a sledgehammer on the axis from the side of the drum, knock out the left bearing 6200 with the axle. It is best to hold the sleeve in your hand so as not to damage the flanges. Advice: If the bearing does not come out of the aluminum housing, then warm it up with an industrial hair dryer or a burner (carefully!) To 100 degrees and try again without cooling the housing. Use mittens and mittens to avoid getting burned!

We take out the axle with the left bearing 6200 from the bushing (from the right bearing 6000)

And remove the left bearing 6200 from the axis. Landing without interference, the puller was not required here. If this area corrodes, use a torch, industrial hair dryer and WD-40 liquid to wet the contact area.

We insert the axle into place and knock out the right bearing 6000 sitting in a slotted nut screwed to the base of the ratchet.

Excuse: This method of dismantling involves the subsequent replacement of the bearings, because balls and tracks can be damaged and subsequently begin to crumble. But IMHO it all depends on the strength of the blows. If the bearings came out easily enough, then IMHO they still look like !

Remove the ratchet. 4. Clamp the sleeve in a vice by the brake disc flange with a ratchet down or sideways (through a thick rag or piece of felt) and hex 11, inserting it from the side of the left bearing 6200, unscrew the locking sleeve-bolt. The thread is right there.

To remove the ratchet from the bushing body, move the bushing in a vice with the ratchet up, insert the hexagon 11 from the side of the right bearing 6000 and unscrew it. Right-hand thread. Addition: For Shimano hubs, use a 10 wrench at this location, unscrewing the hub that pulls the ratchet to the body. The thread is also right-hand.

Advice. May need a spanner extension 300-500mm.

Pay attention to the location of the O-ring, so that later you can put it also. with the protrusion towards the drum.

We disassemble the ratchet 6. We clamp the special key in a vice and install the ratchet on it by inserting the key into the slots of the nut. We insert the hexagon 11 into the base of the ratchet and pull off the nut from its place. Left-hand thread, i.e. unscrew it clockwise. It may take some effort. Internally, the structure of the ratchet assembly for the concept of the principle of what how to twist:

After the nut has been lifted from its place, we clamp the hexagon 11 in a vice, install a ratchet on it and finally unscrew the nut with a special key. There are three shims under the nut. two thin and one thick. The thick one stands on the side of the nut (both two and one gasket can be installed). Remove the gaskets with a magnetic screwdriver. We remove the balls of the upper bearing without lifting the drum from its place, so as not to lose the balls of the lower bearing.

Advice. If it is not possible to immediately remove the nut from its place, we warm it up with a burner or an industrial hair dryer up to 100-150 degrees. When trying to slide the nut, twist the tool back and forth with light jerks. Note that the special key may bend or the hardened slots in the nut will cut off the edge. Act carefully.

Addition. The described procedure will prevent the balls from scattering due to awkward movement when manipulating the hexagon and an inconvenient special key when you completely disassemble the hub removed from the wheel. If you only need to change the lubricant, then you do not need to unscrew the ratchet from the bushing body, and it is more convenient to unscrew the nut by pulling the nut off its place with a special key clamped vertically in a vice and turning the wheel by hand.

We put the ratchet on the plate. Carefully lift the drum, holding its base, and remove the balls. Do not mix the balls of the lower bearing with the balls of the upper, because they can come from different size groups. However, if rust has already worked there, it will not matter.

We remove, if necessary, the pawls and the annular spring from the base of the drum.

If it was not possible to remove the adjusting washers earlier, due to the fact that they adhered to the base of the ratchet, we do it now.

The ratchet is disassembled (the spring in the photo is broken in half, a serviceable spring has a mustache for fixing)!

Analysis of bushing damage caused by corrosion

disassemble, shimano, bike, ratchet

Typically removing the ratchet base from the hub body for routine maintenance, i.e. cleaning and lubrication is not required. But in the case described below, a complete disassembly of the bushing was required to clean the parts from rust and restore the protective coatings. about these works. in the following articles.

And first, let’s analyze the reasons for such a disastrous state of the parts of this sleeve.

As shown by the autopsy, the death of the sleeve (anamnesis. it was jammed so that it was riding like on a track bike, constantly pedaling) was caused by prolonged exposure to water that got into it. Apparently, an insufficiently stable liquid lubricant was used at the plant, because no traces of grease were found (photos were taken immediately after disassembly, without rinsing). The situation was aggravated by the fact that industrial bearings were used! Let’s turn to the facts and consider

The part The nut into which the industrial bearing was pressed was made by analogy and from the same blank as the similar part the outer ring of the bearing. the nut of the bush on the cones. The groove, which can be seen at the bottom of the nest, tells us about this. It looks like a fragment of the raceway of a tapered bearing, cut off when boring the socket under the industrial. It is possible that the part was reground already from a ready-made tapered bearing.

disassemble, shimano, bike, ratchet

As you can see, there are no O-rings between it and the drum. Meanwhile, in each way sleeve on the cones, seals are used, pressed into the drum in front of the nut in the form of a rubber cuff sliding along the cone, and the gap between the nut and the drum is obviously filled with a grease necessary for the operation of the tapered bearing. This ensures that the ratchet assembly is sealed on this side.

On the opposite side, a rubber ring is used, which seals the drum at the end (a rubber ring on the ratchet thread. in the photo)

In the case of an industrial bearing, ALL the grease is contained in it, and the gap between the nut and the drum is dry and open. The bore for locking the bearing, although it has a dirt bumper, but it does not protect against water ingress into the ratchet when immersed in water.

The first to suffer from corrosion is the spring, which breaks, then the balls, then the tracks become covered with ulcers, and the dogs turn sour.

The industrial bearings themselves also did not avoid corrosion due to weak seals and a small amount of already coked grease that did not prevent corrosion.

Before installing such a bushing on a bike, I would recommend disassembling the ratchet as described above (but without unscrewing the ratchet itself from the bushing housing) and put waterproof grease in the industrial bearings, ratchet bearings and under the bore of the right bearing. on this in the next article.

During operation of the bike, do not immerse the hub in water for a long time. If you had to do this, then, if possible, you need to quickly remove the wheel and shake out the water from the drum, hitting the wheel on the ground and holding it with a ratchet down.

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Puller and key

Removing a long-established ratchet requires considerable effort. It can get stuck and rusty. There must be special tools available, which are a puller and a large adjustable wrench or wrench.

The puller is a slotted wrench for disassembling or installing the ratchet mechanism. It is unscrewed counterclockwise using a wrench or adjustable wrench. Ratchet and cassette tools are similar but completely incompatible, do not confuse them.

    The rear wheel is removed first. If the ratchet has not been removed for a long time and it is difficult to remove it with a puller, then it is better to use WD-40 grease. It is better to lubricate the threads from the inside, under the stars, and leave for several hours.

How To Service Shimano Ball Bearing Rear Hub. Service A Shimano Hub

When removing, there may be a problem in the lack of effort to unscrew the stuck mechanism. This problem is solved by lengthening the tool. This can be done with a small tube. Take two bolts 6–8 cm in size and select the nuts for them. One is inserted into the hole in the puller, and the other into the hole in the handle of the adjustable wrench. Clamp with nuts. Insert a tube between the bolts. It turns out a lever with which it is much easier to rip off a stuck device.