DIY Grass Trimmer Shaft
Making a flexible shaft
The first step is to prepare the cable. It must be pulled out of the protective sleeve. In order for it not to bloom, when we cut off the restrictive seal, it must be soldered with tin. Flux-coated, heated, tin-soaked, cut off.
We take it out of the sleeve. On any brake cable, at the other end there is a threaded rod for adjusting traction. We cut off the thread from it, so that a small segment remains, one and a half centimeters. Next, we solder a metal tube on this section, on which we will later put on bearings. We also smear the soldered surfaces with flux, put the tube on a piece, throw a piece of tin into the tube, and heat it up with a soldering iron until the tin melts and spreads over all lubricated surfaces.
While the tube with the soldered cable is cooling down, prepare the stem for the chuck. I took it from a CD drive. But any suitable caliber can be used. We adjust this rod to the inner diameter of the tube by winding electrical tape on it until the desired caliber is reached.
We insert the stem into the tube, covering it with glue.
When the glue seizes inside, the connection will turn out no worse than from soldering, this can be seen in the video Next, we will prepare the holder body. For this purpose, I took an aluminum case from a perfume bottle. it almost perfectly fit under the bearings. We drill a hole in the end of the body for the stem exit for the chuck.
We put the bearings on the tube with the cable. My bearings fit well, but to be sure, I also added a drop of glue, for greater reliability.
Next, we also adjust the bearings to the housing using electrical tape.
We drip glue inside the case, and insert the tube with the bearings put on it. We position the bearings so that there are free edges of the housing. About a centimeter.
Do not forget to drop a drop of oil onto the bearings. We make sure that the glue does not get into the bearing mechanism, otherwise all the work done will go down the drain! I used the glue Cosmo CA-500.200. it is extremely difficult to tear off something glued with it, that’s why I preferred it to soldering So, the shaft housing is ready. It remains to attach the wooden part of the handle with a cable sleeve.
We pass the sleeve into the wooden handle, attach it with glue inside the handle. Next, grease the cable abundantly with grease.
We pass it through the handle with a sleeve and attach, again, with glue, the wooden handle to the aluminum body.
If the resulting flexible shaft is planned to be used only for a drill or screwdriver, then this is the end of the work. we fix the protruding end of the cable into the drill chuck, and use it with pleasure!
Trimmer Repair. Replacing the Lower Flexible Driveshaft (Ryobi Part # 791-181852)
And if you made a shaft for an engraver from a thin bicycle cable, then you also need to make a hard protection for the cartridge so that the elastic cable does not loosen it. Each engraver has a threaded cap below the chuck. This cover is removed and, if necessary, a plastic cartridge with a flexible shaft cable is screwed onto this place. We need a thread, like on a lid, a piece of plastic pipe, into which the thread will fit, and a tapering end, into which we will thread the sleeve of the cable. There is nothing complicated here; glue all the parts together, put them on the cable sleeve, clamp the end of the cable in the collet chuck, and screw the resulting cap onto the engraver’s body.
It will prevent the rotating steel cable from loosening the brass collet. I made a flexible shaft for a drill, but to show clearly how to use it with an engraver, I also made such a protective cap.
Such a shaft will not take up much storage space. it is easy to twist it into rings, and hang it on a nail in a barn or closet, and at the right time it will help you make a hole in a hard-to-reach place, or screw in a screw there.
How does the engraver work and how does it work?
The engraver, which allows you to process parts with high precision and productivity, works like a conventional drill, and outwardly it is very similar to a large-sized automatic pen. The main structural elements of such a device are:
- flexible drive shaft that transmits torque from the engine to the working attachment;
- a fan for cooling the spindle;
- the spindle itself with a protruding working part;
- device body with special openings for heated air outlet;
- a nut designed to fix the used attachments;
- device power regulator;
- blocking button;
- power switch;
- hook for hanging the switched off device.
Rotation from the motor is transmitted to the axis of the flexible shaft, the reverse side of which is connected to the working attachment. The attachment seats are unified, so there are no problems with the choice of the required tool and its replacement.
What operations are performed using a flexible drive engraver
Special attachments help to turn an engraver with a flexible shaft mounted on it into a truly universal device, including:
- grinding and polishing wheels, allowing to bring the surface of the workpiece to an impeccably smooth state;
- brushes used for cleaning the surface of the product and grinding it in hard-to-reach places;
- cutting wheels for cutting products and processing their torn edges;
- drills, with the help of which the device turns into a miniature drill;
- cutters and abrasive wheels, which allow processing products in hard-to-reach places;
- pen-shaped attachments for engraving.
To ensure the convenience of working with such a device equipped with a flexible drive shaft, you can purchase additional accessories. rubber pads on the handle, power button lock, etc.
All kinds of holders turn out to be very useful, in which, in addition to the shaft and the engraver, various attachments can be fixed.
Engravers, on which a flexible drive shaft is installed, also include a drill used in dentistry, a manicure machine, equipment for processing natural stone and applying inscriptions and drawings to the surface of products made from it.
You can also use a flexible shaft for a drill or purchase a flexible shaft for an electric screwdriver. With the help of this improvement of the usual power tools, an attachment for an electric screwdriver or a drill can be successfully applied to work even in the most difficult to reach places.
It will take
- Two bearings from old roller skates (or similar in size).
- Steel cable in a protective sleeve, from a motorcycle (or from a bicycle).
- Metal tube with a suitable diameter for the outer diameter of the bearings.
- Wooden handle from an old soldering iron (or similar wooden tube).
- Steel rod for the shaft, on which the chuck will be installed later.
- Collet-chuck, with an internal hole, for the shaft of your choice.
- Metal tube, with a diameter for the inner diameter of the bearings.
Tools and consumables required for work:
- Soldering iron, tin and flux.
- Bur machine or engraver, with a saw blade and a 3 mm drill.
- Secondary glue with soda.
- Insulating tape.
- Solid oil and machine oil.
What I have: a lawn mower or grass trimmer?
Very often, lovers of a personal household confuse these two concepts. Meanwhile, these are two fundamentally different types of technology, although they serve the same purpose. But it is very easy to distinguish them.
The lawn mower is an inventory that does not need to be lifted. it has wheels. Another distinguishing feature of the lawnmower is the special collection container. the lawnmower does not scatter the grass over the area like a grass trimmer does. However, some types of lawn mowers deliberately create a mulching layer of grass during operation by spreading it on the ground.
A grass trimmer is a tool that must be carried. often with a special shoulder strap. The trimmer allows you to adjust the height of the bevel by directly raising or lowering it above the ground with your own hands. The lawn mower, on the other hand, is adjusted due to the clearance.
Flexible shaft for a drill: design features
A very popular drill tool is capable of more than indicated in its instruction manual. The main task of this tool is to drill holes in various existing materials. The improvement of this tool has led to the fact that today a flexible shaft is produced for a drill. This is a special attachment, thanks to which the torque is transmitted to the tool that is not aligned with the electric motor.
A flexible shaft for a drill is capable of bending in any direction, which, in fact, is its main advantage. This shaft capability was achieved through the use of the following parts:
- Steel rope acting as a rotating core.
- Spiral wire located outside the device.
The shaft is covered from the outside with a special shell, which prevents the lubricant from leaking out. This lubricant helps to reduce friction and also protects the core from mechanical stress (abrasion), damage and moisture ingress.
Why do you need a flexible shaft
The flex drive consists of components such as an armored cable and a soft body. One side of such a device is equipped with a tip for fixing in the tool holder, and the second has a similar (or collet) chuck to install the corresponding work items: drills, cutters and others. Such equipment is used in such exceptional cases when it is impossible or inconvenient to work with a stationary drill.
On an ongoing basis, a flexible shaft is used in medicine, in particular in dentistry, since almost all drills function through such a device. In construction, such a device is used extremely rarely, but if it becomes necessary to drill a hole or grind a surface in a hard-to-reach place, then only a flexible shaft on a drill will help to solve the problem.
The flexible shaft can be used not only to connect to a drill, but also to a screwdriver or mini drill. Thanks to such a shaft, the working nozzle is removed from the body of the main tool, which allows various types of delicate work that requires little effort. With the help of this equipment you can drill holes from 1 mm, and also carry out cleaning, grinding, screwing and unscrewing screws and other fasteners.
It’s important to know! The advantage of using a flexible shaft is to reduce the load on the hand, since during work, the effect of vibration from the tool and its weight is almost completely eliminated.
How to do it yourself
To equip an electric drill with a structure in the form of a flexible shaft, you do not need to purchase it, especially if you do not plan to use the device for prolonged work. You can make a device yourself from available tools, saving not only money, but also time to search.
To make a flexible shaft for a drill or electric screwdriver, you should use any braided wire available in the arsenal. If it is not available, then it can be purchased. At the same time, the length of such a wire can be chosen absolutely any, depending on the technological tasks.
It’s important to know! It is impossible to screw a spiral layer (armor) onto an ordinary wire manually, so you should use a ready-made structure.
Alternatively, you can use a speedometer cable from a car or a throttle or clutch cable from a motorcycle to make a flexible shaft. After the finished braided wire is available, you will need to connect one end of it to the shank. As such, you can use a shank from a damaged drill. To connect the steel cable to the shank, you need a steel nut and a welding machine. The other end of the steel cable must be connected to any existing drill chuck. At the same time, it is important to understand that when performing work with such a device, you should hold your hand not to the cartridge, but to the braid or the outer layer of the wire.
A self-made shaft design will not only save money, but also get a product of the required length. Standard products manufactured by production have a length of no more than 50 cm.Sometimes this is not enough, so you have to resort to making your own equipment for a drill.
In conclusion, it should be noted that the drill, due to its improvement, is becoming an increasingly versatile type of tool. The flexible shaft is a very convenient and effective drill attachment, with which you can solve any difficult task.
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Flexible shaft device
Alloy steel multi-fiber rope is housed in a flexible body. Wire shafts have multiple layers of braid with alternating clockwise and counterclockwise directions. armor. On one side of the fixture, a shank is fixed, such as on the tool. The second ends with a cartridge. There is a lubricant under the shell to reduce friction and prevent corrosion and moisture ingress. For the body, they choose hoses made of plastics and nylon, create special ones. from tapered bushings and spirally twisted tapes.
The cable is fixed in the housing through bearings or bushings at the ends, allowing it to rotate freely. The torque is transmitted to the shank and through the wire to the fixed tool. The immobility of the outer shell of the flexible shaft is ensured by its attachment to the body parts.
Before starting work, unscrew the fastening sleeve on the drill and insert the end of the shaft into the tool hole. The retaining ring is clamped, as when installing the drill, directly into the tool holder. Now you need to fix the drill so that it does not move from the vibration of the engine and does not fall.
Lawn mower shafts
The grass trimmer has flexible and rigid shafts. The choice is made according to the intensity of the load on the scythe and the stiffness of the grass that you will cut. The solid shaft is suitable for heavy loads in the form of thin branches of bushes, rigid stems and possible bumps, uneven soil, debris. They are designed for professional use during a work shift every day. Such tools have increased strength and heavy weight.
The lawn mower’s flexible shaft fits on lightweight lawn and garden trimer models. As a cutting tool, fishing lines, drums and lightweight knives are used. When an overload occurs, the flexible shaft twists. It breaks off most often at the top, near the engine. Parts should be chosen in the direction of the upper braid, since they can only transfer rotation in one direction.
There is no outer casing on the shaft. It is replaced by a cavity in the handle of the grass scythe, which runs from the engine in the shoulder to the attachment of the knives. At the beginning of the season and in case of replacement of the shaft, the cavity in which it is located should be thoroughly flushed. Then fill it with fresh thick grease, the brand of which is indicated in the passport for the product. You can add it once every 3 months.
Flexible speedometer shaft
Light cables transmit torque from the wheel axle to the speedometer’s magnetic coil. When driving, you need to know the speed. When the flexible shaft fails, the arrow on the device lies in the extreme position or jumps sharply if the machine runs into an obstacle. You can repair the speedometer yourself.
The flexible shaft is matched to the car brand. You can check compliance with the attachment points and length. It should fit easily into the sockets of the gearbox and speedometer. If installed incorrectly, the speed readings will be incorrect. If the shaft is long or has a small bend radius under the torpedo, a characteristic knock will appear. The service life of the speedometer drive will be short.
Any, even a very compact drill, has certain dimensions. This limits the use: it is not always possible to “crawl” into a secluded corner. The power tool market offers portable options called “dremels” by the manufacturer’s name.
With the help of such a device, you can get into places with limited access, however, it also has disadvantages:
- after all, the dremel is not compact enough, the size of the electric motor does not allow to reduce the tool;
- small size means little power.
In addition, in addition to trivial drilling, using a drill (of any size), you can perform other methods of processing the material: grinding, engraving, imparting complex shapes to the workpiece (turning). To do this, you need to hold the working tip with your fingers, like a fountain pen. Of course, even a very compact instrument cannot be used in this way.
Again, except for compact engravers.
How to get out of this situation? Tool manufacturers offer flexible shafts for power transmission.
Do-it-yourself flexible shaft for a drill
In mechanisms, it becomes necessary to make a unit rotate, which changes its position relative to the motor or is in a different plane. To transmit torque to a tool that is not aligned with the engine under heavy loads on stationary installed mechanisms, a cardan is used. A flexible shaft is installed in tools and light equipment. It flexes easily as it rotates and consists of an armored cable or wire and a soft shell.
Repair start button
If the electric scythe does not show signs of life, then there may have been a break in the electric cable inside the handle of the case, or the button for turning on the electric motor is faulty.
In order to diagnose an electrician, you will need to disassemble the handle of the electrical appliance. The work is carried out in the following sequence:
- The control handle is removed from the electric scythe frame.
- The handle is disassembled.
When access to the inside of the electric trimmer is provided, the resistance of the electric trimmer button is measured using a multimeter. If there is no resistance after pressing, then this
the part is subject to mandatory replacement. It is also necessary to check the connection points of the power cable with the internal electrics located in the handle.
device. The contacts should be checked for open circuit with a multimeter. Often such a malfunction can be determined “by eye”. After detecting an open contact, it is enough to solder the damaged area to restore the operation of the electric trimmer.
In the absence of a multimeter, diagnostic work can be performed with an indicator screwdriver. For this purpose, connect the plug to the mains and using this diagnostic tool
find the “phase wire” and thus check the presence of electric current before and after the power button. If the phase current is detected in another electrical circuit, then it is enough to install the electrical plug on the contrary in the outlet so that correct diagnostics can be carried out
faulty grass trimmer. The second diagnostic option should be done with great care, since there is a danger of electric shock when checking the integrity of the wiring.
DIY grass trimmer repair: common causes of breakdowns
The grass trimmer can be damaged when working under heavy loads. This situation can occur when the treated area is overgrown with tall grass.
When working in such areas, the engine may fail, the bearings may break, and the coil of the electric scythe will collapse. When operating in rainy or very foggy conditions, the grass trimmer may “burn out” as a result of a short circuit.
Damage to this electrical appliance can also occur as a result of frequent use. If the household appliance is used in this mode, then after operating a certain number of operating hours, it will be necessary to carry out mandatory repairs and preventive adjustment of many parts of the electrical appliance.
Checking the electric motor
If the power button of the device and the sections of the internal wiring are intact, then you should start checking the electric motor. For this purpose, it is necessary to remove the housing cover, having previously unscrewed several screws with a screwdriver.
The first thing to do after accessing the electric motor is to check that the brush assembly is working properly. If the brushes are worn out above the maximum permissible value, then the electric motor may stop completely or work unstable. In the case when the brushes and the collector are in perfect order, you should start “ringing” the motor winding. In order to eliminate the likelihood of breakage in both circuits, you should alternately carry out
checking the stator and rotor of the motor. To perform this operation, you must:
- Remove the engine from the electric scythe.
- Switch on the multimeter in resistance measurement mode and check all collector plates for breakage. When checking, there should also be no significant deviations in the readings of the diagnostic tool.
- Check for breakdown of the rotor winding to ground. For this purpose, connect one probe of the multimeter to the rotor “mass”, and the other to any collector plate. The multimeter must be set to measure resistance over 1 megohm. The resistance of a working motor between the winding and “ground” should be very large.
- Measure the resistance value of the stator winding. If there is no resistance, then we can state in this case its malfunction.
- If the stator wiring is in perfect order, then a check is made for its possible breakdown on the case, in the same way as when diagnosing the stator.
When checking in this way, it is possible in 90% of cases to establish the cause of the malfunction of the electric motor. It will not be possible to check for an interturn short circuit, which can manifest itself only during the engine operation, thus it will not work, but such a malfunction can be diagnosed
by indirect signs, which are manifested in a decrease in the power of the electric motor and its overheating. If the electric motor is equipped with a thermal relay, then such an electric scythe, with an inter-turn circuit, will work for a short time, after which the grass trimmer will automatically turn off. In some cases, the thermal relay can cause a malfunction of the electric grass trimmer motor, therefore, in a set of test
events, the “ringing” of the thermal relay must be turned on using a multimeter or tester.
It is very simple to do this: in good condition, on a cold engine, the thermal relay passes an electric current,
in a faulty state, the electrical circuit will be open.
Problems with the performance of electric scythes associated with wire breaks can be easily eliminated by soldering the contacts, but if the motor “burned out”, then you will need to perform a complex rewinding process, which can
carried out by a qualified technician only. In many cases, it is much easier and cheaper to purchase a new engine and install it in place of the burned out one. This work can be done independently
If the electrician of the grass trimmer is in good working order, then you should pay attention to other types of malfunctions that may appear during the operation of the electric scythe.
DIY grass trimmer repair, common causes of breakdowns
The use of various electrical devices greatly simplifies the implementation of many types of work, but unfortunately, all complex products break down sooner or later. Failure of the electric grass trimmer
will lead not only to the inability to carry out work in the garden, but also to significant financial waste on repairs. It is possible to significantly save money and increase your own knowledge of the device of this technique if you do the repair of the grass trimmer yourself. Before proceeding with this type of work, you should carefully study the principle of operation of this type of household appliances.
Mechanical faults of the grass trimmer
If the electric motor of the device turns on, but the reel with the line does not rotate, the causes of such a malfunction may be the breakage of the flexible shaft transmitting the torque. This problem is especially often manifested with improper care of the electrical appliance. For example, in the absence of lubrication inside the rod of the electric cable, the cable will be exposed to excessive friction and within a short time this part will fail. To replace, it is enough to disconnect the upper part of the electric braid, in which the electric motor is located, after which it will be possible to remove the flexible shaft from the rod.
If there are difficulties with the extraction of the second part of the cable remaining in the cavity, the lower part of the grass scythe with the reel and the shaft is disconnected. The assembly of the mechanism is carried out in the reverse order.
bottom engine grass trimmer
Before installation, the flexible shaft must be thoroughly lubricated with grease to reduce the likelihood of repeated failure of this part.
Flexible shaft rupture can only occur on top-engine electric trimmer models.
how to make a powerful grass cutter trimmer at home (DIY brush cutter)
Electric scythes with a lower engine location do not have a flexible shaft, but malfunctions of such devices can manifest themselves in the form of destruction of the bearing of the main shaft of the electric scythes on which the bobbin with fishing line is installed.
To fix such a malfunction is very simple, it is enough to replace the failed bearing with a new part.
Electric grass trimmer: device and principle of operation
- Enclosures with an electric motor.
- Split rod.
- Trimmer reel with protective cover.
- Shoulder strap rivets.
A power cable with a plug is connected to the grass trimmer body, through which the electric current is transmitted. In the cavity of the split rod there is a flexible shaft, due to which the torque is transmitted to the trimmer coil. The device is turned on by pressing the button located on the handle of the device.
This grass trimmer design is the most common, but
if desired, you can find products that operate on a battery, as well as with a lower location of an electric motor.
With frequent use and improper care of the electric scythe, the listed malfunctions can appear with enviable regularity. To minimize the likelihood of breakage, it is enough not to overload the device, lubricate rubbing parts in time and do not work in high humidity. Despite some restrictions when working with this device with an electric grass trimmer, unlike petrol trimmers, there can be no malfunctions in the ignition unit. And such a malfunction as: “the grass trimmer motor immediately stalls”, in principle, can not be. The motor of the electrical device cannot stall because it does not need to be started. To start, just press the power button, so many summer residents choose electric grass trimmers to care for the surrounding area.
Checking the electric motor
If the button and the cable supplying the tool turn out to be serviceable, you should proceed to diagnostics of the power unit. To do this, you need to disassemble the case in which it is located. Usually you just need to unscrew a few bolts or screws and remove the cover.
The first step is to check the condition of the collector brushes. Wear of this unit can lead to unstable operation or to a complete stop of the engine. If the brushes are in satisfactory condition, check the motor winding for a short circuit.
For this operation, it is necessary to completely remove the engine, and then, in mode, check all collector plates for breakage. The device should not show significant deviations in measurements.
The second check is the “ringing” of the rotor winding to ground. To do this, you need to connect one contact of the multimeter to any collector plate, and the other to the rotor ground. In this case, the resistance measurement mode must be greater than 1 MΩ. If there is no short circuit, the instrument will show a very high value.
If, according to the results of these checks, all parameters turned out to be normal, you need to measure the resistance of the stator winding. The readings should be the same as for the rotor. If not, then the fault lies in the stator.
If there is an interturn short circuit in the motor, it will not be possible to diagnose it in this way. However, this problem can be identified by watching the grass trimmer in action. An indirect sign of such a malfunction will be a decrease in the operating power and overheating of the equipment.
When, as a result of diagnostics, it became clear that the engine “burned out”, it will be easier to notice it on a new one. In the vast majority of cases, rewinding repairs will cost the same as a new power unit.
If a thermal relay is installed on the motor, it will cut off the power if it overheats. If the problem is in the failure of the relay itself, this can be detected using the same multimeter or tester. With a cold engine in good condition, the relay must pass current.
Do-it-yourself electric grass trimmer repair: common causes of breakdowns
One of the scenarios in which the tool fails is mowing a heavily neglected area. In this case, increased loads affect the equipment and the power unit often fails. Damage to bearings or spool is also possible.
And when work is carried out in rainy weather, electrical equipment can simply be closed. Also, do not forget about a certain resource of individual tool nodes that are not designed for constant use. The device requires timely inspection with the replacement of worn parts.
In some cases, repairs can be made independently, without the involvement of third-party specialists, the cost of which is often considerable.
Reliable Trimmer Head (Grasshopper)
Electric grass trimmer repair
The electric grass trimmer replaces the conventional scythe. Today, most city dwellers do not even know how to properly use a “rare” instrument. A modern person does not need this, because he has an electrical analogue. But if an ordinary braid had to simply be sharpened from time to time, then with a power tool, things are more complicated. The equipment requires some maintenance, and if a malfunction occurs, repairs can lead to large expenses. However, it does not always make sense to carry a broken tool to the workshop: often you can deal with a breakdown on your own.
Repair start button
If the instrument does not react in any way to attempts to turn it on, there are two possible malfunctions. a cable breakage inside the handle or failure of the power button.
Important! Make sure the device is disconnected from the mains if it is a fixed type. In the case of the cordless version of the tool, first disconnect the power terminals, and only then proceed with the repair.
In order to understand what exactly the breakdown is, you need to disassemble the handle.
Having gained access to the inside, you should, armed with a multimeter, measure the resistance of the button. If it is missing after pressing, the button must be replaced.
You also need to check the contacts of the connection of the power cable with the contact group. Often there is no need for such a measurement, since a break can be detected with the naked eye. In this case, it must be eliminated by soldering.
In the absence of a multimeter, the same work can be done using an indicator screwdriver. To do this, after disassembling the handle body, the power cable is connected to the network and the presence of a phase before and after the button is checked with a screwdriver. If the button comes to zero, the plug in the outlet can be turned over and the measurements can be repeated.
Attention! Be very careful when checking for phase presence in this way. There is a possibility of electric shock!
The device and principle of operation of the grass trimmer
To understand what exactly can break in an electric braid, first you need to figure out how it works.
An electric grass trimmer usually consists of the following elements:
- housing with a motor inside;
- detachable rod;
- coil with protection;
- shoulder strap attachment.
The current is supplied to the power unit through the connector on the housing to which the cable is connected. The bar is hollow inside. it acts as a protective sheath for the flexible shaft, transmitting torque from the motor to the grass trimmer coil. The handle, located on the body, has a button, when pressed, the device turns on.
The described design is considered classic. However, there are versions of the tool in which the motor is located in the lower part near the coil, as well as battery versions.
This type of problem can be attributed to the breakage of the flexible shaft. This is easy to recognize. the motor is running and the line spool does not rotate.
The cause of the breakdown is unscrupulous care of the tool, which consists in the timely lubrication of the inside of the rod. In the absence of the correct amount of lubricant, the shaft will be exposed to excessive friction and breakage will be a natural result.
This breakdown is corrected by replacing the shaft, which can be removed by disconnecting the top of the grass trimmer from the boom. If the second part of the shaft is not retrievable, it may be necessary to disconnect and the lower.
When installing a new shaft, it must be pre-lubricated.
Such a malfunction can only occur with a classic arrangement of parts. In devices where the power unit is located at the bottom, there is no flexible shaft. However, with this arrangement, the role of the transmission mechanism is played by the bearing located on the motor shaft closer to the place of torque transmission. In this situation, the bearing just needs to be replaced with a new one.