Do-it-yourself door lock handle repair

In detail: do-it-yourself front door lock handle repair from a real master for the site my.housecope.com.

How to fix the lock on the door if it suddenly failed? Such an unpleasant situation requires an urgent solution, especially when it comes to the front door. In this case, you can make repairs yourself. What is required for this and what steps need to be taken?

To know how to repair it yourself and not damage the door lock, you need to familiarize yourself with its design. There are many types of mechanisms. The following systems can be used for the entrance wooden or metal door:

cylinder - the key is small in size, with notches and protrusions;
suvaldnaya - a key on a long leg with "wings" on the sides;
disk - a small semicircular key with notches;
Phillips - the key is similar to a Phillips screwdriver.

The main types of door locks for the front door

The principle of operation of such systems lies in the features of blocking elements: cylinders, levers or disk plates. Cross locks are similar to cylinder locks, but they do not differ in reliability, since the secret can be cracked with a simple screwdriver.

There are also overhead and mortise locks. Repairing the invoice is quite simple, since you only need to remove the overlay. But it will be more difficult to correct the mortise on your own. You should not undertake repairs if you are not familiar with the rules for installing the mechanism, since you can only repair a door lock of such a plan by disassembling it.

Repair of a door lock largely depends on the nature of the breakdown. It is not always possible to fix the problem with your own hands.

A common cause of door lock failure is the failure of the locking mechanism tongue.

Video (click to play).

The most common problems are:

The tongue does not close. The reason may be the insufficient size of the response hole. In this case, you need to bore it or move the iron plate. The pad of the lock itself at the end of the door can block the tongue. A distortion may also occur due to frequent use of the door, due to wear and tear of the mechanism. It needs to be adjusted.
It is difficult to open the door. It can be blocked by a skewed lock or a door frame. The problem is fixed by adjusting these items.
It jams, turns poorly or the key is not inserted. Especially often such a breakdown occurs in the locks of a metal door. The cause may be clogging of the mechanism or displacement of its individual parts. To fix it, you need to disassemble the lock, clean it, lubricate it and install it in its place.
Jamming the lock. The reason lies in the state of the larva. Repair of the lock, its replacement or a complete change of the lock can help.

Replacing the larva will help extend the life of the locking mechanism

How to fix a cylinder lock on a door with your own hands:

Remove the armor plate.
Loosen the fixing screw at the end of the door.
Pull out the cylinder.
Replace it with a new one and put all the parts back in place.

In the case of a lever mechanism, it is better to completely replace the lock, since it is likely to break again. If the tongue is sunk, you need to disassemble the structure and adjust its position.

Other types of mechanisms are less reliable or do not have replacement parts of proper quality on sale. First of all, this applies to disc and cruciform secrets.Therefore, it is easier to install a new lock than to repair a broken larva.

More complicated is the situation when the spacer mechanism becomes unusable. In this case, the repair is carried out by removing the door from the hinges and disassembling the canvas. The peculiarity of this lock is that when the door is closed, additional crossbars are extended both vertically and horizontally.

Any locking mechanism requires periodic lubrication

Let's say you checked the status of the secret and did not find the source of the problem. All parts are intact and in the right place. How to repair a lock with a working larva in a metal door with your own hands? Most likely, the cause of the breakdown lies in the clogging of the mechanism. This situation is not uncommon, especially when it comes to a metal door.

In this case, do-it-yourself repairs are easier than ever. First, open the lock. Remove all parts of the mechanism. Blow it out thoroughly and use a stiff brush to remove all dust and other dirt particles that have accumulated inside. Then wipe the larger parts with a cloth. Apply a small amount of lubricant to a cotton swab and carefully work each element of the lock. Assemble it and put it in place. Check out the quality of his work.

Please note: after such processing, the key may become contaminated with lubricant for some time.

Quite often, it is required to repair the lock in the interior door. They are heavily loaded, and therefore, over time, the tongue begins to sink, the handle jams or the latch dangles.

How to repair the lock in the interior door with your own hands:

If the problem lies in a sunken latch tongue, you need to disassemble the lock and install it in place. The spring may need to be replaced.
If the handle is loose and does not retract the tongue to its original position, you need to check its fastening relative to the rotary mechanism. After that, put it in place and tighten the screws. From time to time, you need to carry out a similar procedure and lubricate the mechanism to prevent its breakdown.
When the latch sticks, you need to disassemble the part of the lock that is responsible for fixing it. The reason may be the displacement of the part, the mashing of elements, their deformation or crack. In this case, you need to replace the damaged spare part with a new one.
If there are problems with the turnkey lock, the repair is carried out according to the same principle as for the front door. Perhaps the replacement of the larva or a simple cleaning of the mechanism is required.

If all efforts were in vain, you can call the master. However, it is likely that a new lock will need to be installed.

The key on the front door is the lock. If the installation of the entrance metal door is done correctly and during operation it was not subjected to abnormal loads, then the canvas itself will work for many years. But a lock with a handle is designed for a certain number of closing-opening cycles, and over time this bunch of mechanisms fails. Most often, the cause of the malfunction lies in the fact that the handle has broken. If you deal with its device, then repairing the door handles of the entrance doors will seem like a trifle.

Of all types of door handles, push and stationary models are installed on the entrance doors. Swivel mechanisms are installed only on interior doors.

push type

With the help of a push handle, a person controls the opening of the canvas and at the same time acts on the lock tongue, and with the help of a stationary one, only opens and closes.

The stationary handle breaks from mechanical damage (from impact) or a loose fastener. If the stationary handle is broken, it can be seen with the naked eye. In this case, it will have to be replaced. If the fasteners are loose, then they need to be tightened.

The push handle, like any mechanism with moving parts, has weak points, the failure of which leads to characteristic problems:

The handle is connected to the mounting plate by a movable mechanism. Poor quality steel, poor riveting, or excessive mechanical stress cause the handle to fall out of its seat in the mounting plate. In such cases, it will not be possible to repair the mechanism, and you will have to buy a new one.
A square rod is inserted into the socket on the base of the handle hidden under the mounting plate, which transmits rotation to the lock and shifts the tongue. If, when the lever is pressed, the mechanism works normally, but the lock tongue does not hide, then there are problems with the metal rod. There can be two reasons: during installation, the rod was cut incorrectly and it became short (in a one-sided design). Over time, he could jump out of the hole in the lock case. The second reason is the fragment of the rod due to low-quality steel from which it is made.

Important! It is extremely rare that the seat at the end of the handle can wear out, and the rod can turn.

Return to its original position after pressing occurs due to the spiral spring, which is fixed at one end on the mounting plate, the other - at the end of the handle. If the spring breaks off or pops out of the mounts, then the spring effect will disappear. Repair of the door handle of the entrance metal or wooden door in this case is possible if the spring remains intact.

As you can see, there is nothing special to break in such a design, and any master himself will be able to establish the cause of the breakdown and determine the way how to fix the mechanism. To do this, it is removed and looked under the mounting plate.

Consider how the double-sided door handle with a long mounting plate is removed:

There are two mounting screws at the top and bottom of each mounting plate. Each screw on one side is connected to the screw on the opposite side of the door through a threaded socket (screed). To unscrew the fixing screws, it is necessary to fix the screw on one side of the door with one screwdriver, and turn the screw on the other side of the door leaf with the second screwdriver. So unscrew all four screws.
We remove the handles with fastening straps from the square pin and inspect the turn-and-turn mechanism. We will repair the flown spring, check the mechanism for operability and fix it in place in the reverse order.

Double sided design

In this case, you will have to tinker to get the screws into the coupling.

The order of twisting the mechanism with a decorative strip:

In this system, the handle is additionally fixed to the square rod with a small screw screwed flush in its lower part at the very decorative strip. Use a thin hex wrench to loosen this screw. It is enough to make a few turns for the screw to come out of the hook with the pin. It is not necessary to unscrew it completely.

Important! This screw is the reason why it is not possible to remove the handle with the decorative strip.

Loosening the locking screw

We twist the decorative overlay counterclockwise with our hands.
Now the fixing screws will open, with which the bar is attached to the door leaf (or the screws for the screed connecting the two bars on opposite sides of the door leaf). We unscrew these screws and remove the handle from the square rod.

Unscrewing the fixing screws of the bar

After that, we inspect the rotary mechanism and determine whether it is possible to fix the breakdown or whether the door handle needs to be replaced.

Replacing the handle on the entrance metal and wooden doors is the same. The only difference is that when buying a new mechanism for a metal door leaf, its dimensions must exactly repeat the parameters of the old one. Its mounting holes, the location on the keyhole mounting plate must completely coincide with the holes in the metal sheet.

On your own, you can perform the following repair of the handle:

Video on how to remove and repair the push handle:

To remove the handle, check the integrity of its parts and determine the possibility of repair, you will need a screwdriver and no more than five minutes of time.

The specificity of the locking device (regardless of type) is that its maintenance-free operation is designed for a certain period, the duration of which depends on the number of closing / opening cycles, that is, the intensity of use. Judging by the reviews on furniture forums, home craftsmen most often have to deal with the problem of breaking the front door handle and decide how to fix it. If you understand the varieties of these fittings, the arrangement of samples, then repairing any of them will not cause difficulties.

Such samples at the entrance to residential buildings are practically not installed, except perhaps on the doors of entrances. Their domestic use is on the doors of blocks mounted in the openings of utility rooms, garages, sheds, and the like. Therefore, the breakdown of this type of fittings is of two types. Repair of this type of door handle is the easiest and fastest.

Mechanical damage. It can be a deformation (bending), a crack, a chip, the destruction of the metal - it is not fundamental. The only recommendation is to change; these handles are not repairable.
Loose fasteners. The fittings on the entrance doors are attached in different ways. And if the handle itself is intact, then you only need to tighten the self-tapping screw (screw, bolt) or replace the nail, taking an analogue with a thicker leg.

The most common locking devices installed on the front door leafs. Before proceeding with the repair, it is necessary to diagnose the mechanism. Then it will become clear how to fix the handle and whether it is possible in principle. In some cases, it will not be possible to repair - only to change.

A typical situation is when the fittings, when you try to press it, fall out of the seat and remain in your hand. As a rule, this is typical for relatively cheap locking devices (made in China). In the production of such samples, mainly brass, aluminum or low-quality steel is used. They do not serve for a long time, since the destruction of the material during intensive use occurs quite quickly. Nothing can be fixed; You will have to remove the whole mechanism and install a new one.

In all other cases, repairing the door handles of the entrance doors is quite possible, and will not cause any particular difficulties.

Knowing the device of the lock, it is easier to determine the cause of the malfunction and the method for its elimination. The connection of the door handle with the mounting plate is made by a movable mechanism. Fittings are joined directly to the latch using a rod that is inserted into the groove. It has a square section, and when the handle is turned, the device is triggered, and the tongue moves.

Its return to its original position is provided by a spring, which is fixed at one end on the fittings, the other on the striker plate. It turns out that the device of the door handle mechanism is such that there is practically nothing to break in it; the circle of "suspects" is limited.

Repairing a push-type interior door handle is no different from restoring the performance of analogues installed on the entrance doors. All technological operations, as well as typical malfunctions, are completely identical. The difference is only in the nuances determined by the type of locking mechanism (mortise or invoice) and its model (manufacturer).

On both sides of the sash there are fastening strips connected with long screws. Depending on the model of the lock, there can be 2 or 4 of them. The latter is typical for handles installed on frame doors. The task is to unscrew the hardware and remove them from the landing slots.

It remains to remove the locking mechanism. If it has a decorative strip, then you will first have to unscrew the small screw that secures the handle. After that (counterclockwise rotation) the overlay is removed.

One end of the spring flew off the seat. This becomes clear without disassembling the fittings; with such a defect, after pressing the handle does not return to its original position. It’s easy to fix - hook the spring and check the mechanism in operation. But if the part is broken, then it is useless to repair. First, you still need to find it, with the same linear parameters. Secondly, its stretching force must be identical, otherwise the operation of the lock will cause a lot of inconvenience. For example, the tongue will not fully sink into the sash, constantly clinging to the bar. In this case, it is advisable to install a new lock.

When buying a handle for a metal door, you need to look at the location of the holes in the bar for fasteners. It is unlikely that anyone will be satisfied with the prospect of drilling steel sheets if it turns out that the old sockets for fixing the lock are not suitable.

There is no tongue displacement. Such a malfunction of the mechanism is caused by several reasons.

Option 1 - the handle itself loosened. This is mainly characteristic of specimens made of soft metals (alloys). The edges of its groove gradually expand, and the reliability of the coupling with the rod is lost. There are two ways to solve the problem. The first (temporary, for the period of searching for new fittings) is to seal the gap between the "square" and the groove in the handle. The second is to replace the part. Pens are sold at retail, and you can choose a product of any configuration you like. The main thing is that the landing "nest" is identical in size for reliable docking with the latch mechanism.

Option 2 - damage to the pin. As a rule, in cheap locks, rods are made of silumin, and this alloy does not differ in strength. It is easy to buy such a part, cut it to length, file the ends with a file and install it in place.

The handle falls out periodically, but there is no destruction of the metal. The only reason is a loose or broken snap ring. If it burst, then the fragments will fall out immediately after dismantling the mechanism. This is the worst case scenario - such a lock will have to be changed. If the latch is simply loose, you can try to tighten it. This does not always work out, especially if the steel is of high quality; it springs easily. But there are no other options for repair in a similar situation. With a positive result, the castle will serve for some time.

And the last. Do not forget that any mechanism, including the door handle, needs periodic inspection and maintenance. If you partially disassemble the lock in a timely manner and lubricate the rubbing parts, regularly tighten the fasteners, then there will be no problems with its breakdown for a long time.

It turns out that knowing the constipation device and having only a couple of screwdrivers at hand, it is not difficult to understand how to repair the doorknob of an interior door or entrance door. But if a replacement of some part or the entire mechanism is required, it is better to take a faulty sample when going to the store with you. You need to purchase an analogue "one to one", otherwise it is not a fact that it will fit in size, thickness, configuration, and so on.

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Perhaps, many have had to deal with such a situation - you need to leave the house, but you can’t lock the door, or when you come home, you can’t get there. The situation turns out to be not pleasant, therefore, repairing the door lock of the front door sometimes needs to be done by yourself, moreover, as quickly as possible. I'm not suggesting learning the trade of a sniffer, although they know lock designs better than the manufacturers themselves, but familiarity with locking mechanisms will help you avoid many troubles.

To eliminate the breakdown in the door lock on the front door and at the same time leave it undamaged, at least, you should understand the design features of such mechanisms. Of course, there are a lot of varieties here, but there are four main systems, understanding which, you can start repairing.

Types of systems: 1) disk, 2) cylinder, 3) level, 4) cruciform

Disk system - has a small semicircular key with notches.
The cylinder system is a small key with protrusions and notches.
Lever system - on the long leg of the key on the sides are wings.
Cross-shaped system - the end of the key is sharp, but in general it resembles the sting of a Phillips screwdriver.

The principle of operation of the mechanisms is reduced to the features of the blocking elements: disk plates, cylinders and levers. But cruciform systems are very similar in functionality to cylinder systems, but at the same time they are easy (with certain skills) to crack with an ordinary screwdriver.

Also, such devices can be classified according to the installation method - they can be overhead or mortise. The first option is somewhat simpler, since to dismantle it you just need to unscrew the bar, while in the second case you will need to do more operations.

As a rule, in case of breakage, the crossbars do not move.

As a rule, in the event of a breakdown, you cannot move the crossbars to one side or the other, but this problem can be caused by various reasons. But, you should always be prepared for the fact that you will not be able to fix the problem yourself, or that it will not be possible to fix it at all.

Larva or secret from the inside

What can happen most often:

The door doesn't slam shut. The tongue may not snap into place for the reason that it rests against the bar on the box and you just need to bore the reciprocal hole with a file. Also, the tongue can rest against the lining that holds the mechanism on the end side of the canvas - here you also need to bore the hole with a file.
Problem opening/closing the door. The reason most often lies in the skew of the canvas, or in the skew of the door lock. Check it out and fix the problem. Also, during installation or dismantling, you could bend the walls of the mechanism case - remove it, level it and the functions will be restored
It is difficult to turn and sometimes insert the key (in most cases, this problem is inherent in metal doors). The most common cause of failure lies in the clogging of mechanisms or, as a result, the displacement of parts. In such situations, they simply remove the lock, clean it, or even wash it with white spirit or gasoline (the first option disappears faster), then lubricate it and put it in place.
The system jams, both in the open and in the closed state. Most often, the problem lies in the secret. It is removed, washed with white spirit and a few drops of machine oil are dripped into it. If the rotation is normalized, then the larva is inserted into place, and if not, then it is replaced with a new one.

Replacing the larva with a new one is quite simple

The replacement of the larva (secret, key cylinder) is done in two cases: the first is described above in paragraph No. 4 of the “Frequent malfunctions” section, and the other reason is the need to change the keys (5 pieces are usually attached to the lock in a set). In order to dismantle the old part, it is necessary to remove the clamping bar from the end of the web (usually there are 4 bolts), as well as handles with side plates. After that, you need to unscrew the long bolt that firmly fixes the cylinder in the working position - this way you will release the larva, but it will not come out right away.

The blue tick marks the cam, which not only moves the crossbars, but also stops the part

The fact is that the larva is held by a cam when the key is in the “open” or “closed” position - from a different angle, the key is not pulled out, but this is not necessary. The key remains in the lock and it is slightly turned, literally 5-6⁰ in one direction or the other (you need to try). And then the cam sticking to the side will sink into the body of the cylinder, which will come out of the mounting hole without any problems (just pull the key). You may not need to change this assembly, but a few drops of machine oil will suffice.After dismantling the lock, you can pull out the entire lock, but there are no bolted connections on the body - the side walls are held on by rivets.

Destruction of pins in the larva with a thin drill

If you need to open the door, and you have lost the only key, then this can be solved in at least two ways:

To do this, you have to destroy the set of pins. Just below the well, make a through hole with a thin drill, but provided that there is no protection against drilling. After that, the lock will open with a flat screwdriver.
In the event of a critical malfunction of the lock or the loss of the key, bend the minus thick screwdriver in the form of the letter G and drive this roll into the keyhole. The door will open with a few turns.

The insides of a lever lock - view without a case cover

Lever-type locks can be both overhead and mortise, but in any case, repairing the door lock of the front door requires removal and disassembly. For the overhead version, it is enough to unscrew the screws with which it is fixed to the canvas, and for the internal one, it will be necessary to remove the end clamping bar, and in some models also the handle when a latch is provided there. Then the housing cover is unscrewed, and when it is opened, the problem of breakage is sometimes immediately visible - most often, this is a flown down thrust spring on the levers.

But sometimes you have to clean or wash all the details of the mechanism with white spirit, and the difficulty here is not that they cannot be removed, but that it is problematic to remember the order of the plates (lever). Some locksmiths simply number each plate, scratching the number on it with a scriber, as the marker mark will not hold, because all the parts will need to be cleaned, washed and lubricated. By the way, in such situations, it is best to use fatty or synthetic grease for lubrication, where the operating temperature is up to 70⁰C. But then, when the door goes outside and the castle area is very hot from the sun's rays, then Tosol-OIZ (lubricant-coolant) is perfect. Machine oil will certainly make moving parts easier to slide, but not for long, as it simply drains and is used only for CIP lubrication.

Below you can watch a training video that tells about the disassembly and assembly of the lever lock.

Video: Do-it-yourself disassembly of a lever lockEmergency opening of the lockIf you drill out the shank stand, the lock will crumbleIf I were a sniffer, I would open such a lock with a master key, but this requires skill, although some still manage to open the door without experience with a curved L-shaped screwdriver and a crochet knitting needle. But there is a method that is available to almost everyone - you just need to drill out the shank stand and the inside of the lock will crumble. After that, instead of a key, any bent screwdriver will do to hook the crossbars.Disassembled disc lockIn fact, the repair of disk locks is not much different from lever mechanisms, since it also consists in cleaning, washing and lubricating rotating elements, for example, a pack of disks, although dust almost does not get there, unless you do it intentionally. But at the same time, such a device is a kind of cylinder lock, only the cylinder represents a set of disks, according to the configuration of which the key is made. Here you can change the shape, dimensions and angles, which will allow you to use a different key, only an experienced master can do this.It is noteworthy that amateur hacking of such a device is almost impossible (meaning accurate work without any damage) - a master key will not work here, and drilling a larva will scroll the disks along with the drill. So all that remains is the work of the bugbear, that is, knocking out the larva, which will lead to the discs spilling out. It remains only to insert a simple screwdriver into the well and turn it instead of a key.You can also hammer a roll into the well - this is a flat screwdriver made of alloy steel, which is bent with the letter G. The lock, of course, will have to be thrown away, but the door will open.Broken cross lockAs you can see, there is nothing special to repair in cross locks, since there is nothing to break, so maintenance, as a rule, comes down to cleaning, washing the insides and lubricating. The system itself of this type is extremely inconvenient and unreliable - most often the key wears out first, and all four ribs at the same time, which leads to “biting” during opening, that is, the key jams.There are many ways to hack here, for example:

If the key is broken in the hole of the well, then with a drill slightly larger than the diameter of the key, the larva is drilled out and the device is opened with a conventional screwdriver.

When there is no key at all, but there is a screwdriver, select the nozzle according to the diameter of the well, and in the low speed mode, the larva begins to scroll, pressing more and more. In a few minutes the door will open.

You can even open the cross mechanism with chewing gum, but this will take several hours and preferably the cold season. The chewing gum is pushed into the well, and when it hardens, you drive any screwdriver there and open the door.

The fastest way is to hack with a Phillips screwdriver. It is hammered into the well (in fact, this is the same roll) to the depth of the larva and turned with a gas wrench. This will only take one or two minutes.

Perhaps in this article you learned more about emergency opening or hacking than about repairing the door lock of the front door, but such is life. When the key is lost or broken in the keyhole, then in most outcomes we are no longer talking about the maintenance of the device, but only about replacing the mechanism.How to fix the lock on the door if it suddenly failed? Such an unpleasant situation requires an urgent solution, especially when it comes to the front door. In this case, you can make repairs yourself. What is required for this and what steps need to be taken?To know how to repair it yourself and not damage the door lock, you need to familiarize yourself with its design. There are many types of mechanisms. The following systems can be used for the entrance wooden or metal door:

cylinder - the key is small in size, with notches and protrusions;

suvaldnaya - a key on a long leg with "wings" on the sides;

disk - a small semicircular key with notches;

Phillips - the key is similar to a Phillips screwdriver.

The main types of door locks for the front doorThe principle of operation of such systems lies in the features of blocking elements: cylinders, levers or disk plates. Cross locks are similar to cylinder locks, but they do not differ in reliability, since the secret can be cracked with a simple screwdriver.There are also overhead and mortise locks. Repairing the invoice is quite simple, since you only need to remove the overlay. But it will be more difficult to correct the mortise on your own. You should not undertake repairs if you are not familiar with the rules for installing the mechanism, since you can only repair a door lock of such a plan by disassembling it.Repair of a door lock largely depends on the nature of the breakdown. It is not always possible to fix the problem with your own hands.A common cause of door lock failure is the failure of the locking mechanism tongue.The most common problems are:

The tongue does not close. The reason may be the insufficient size of the response hole. In this case, you need to bore it or move the iron plate. The pad of the lock itself at the end of the door can block the tongue. A distortion may also occur due to frequent use of the door, due to wear and tear of the mechanism. It needs to be adjusted.

It is difficult to open the door.It can be blocked by a skewed lock or a door frame. The problem is fixed by adjusting these items.

It jams, turns poorly or the key is not inserted. Especially often such a breakdown occurs in the locks of a metal door. The cause may be clogging of the mechanism or displacement of its individual parts. To fix it, you need to disassemble the lock, clean it, lubricate it and install it in its place.

Jamming the lock. The reason lies in the state of the larva. Repair of the lock, its replacement or a complete change of the lock can help.

Do-it-yourself repair of the lock on the front door largely depends on the type of larva mechanism. It is in this detail that the source of the problem most often lies. For a metal door, cylinder and lever locks are most often used.Replacing the larva will help extend the life of the locking mechanismHow to fix a cylinder lock on a door with your own hands:

Remove the armor plate.

Loosen the fixing screw at the end of the door.

Pull out the cylinder.

Replace it with a new one and put all the parts back in place.

In the case of a lever mechanism, it is better to completely replace the lock, since it is likely to break again. If the tongue is sunk, you need to disassemble the structure and adjust its position.Other types of mechanisms are less reliable or do not have replacement parts of proper quality on sale. First of all, this applies to disc and cruciform secrets. Therefore, it is easier to install a new lock than to repair a broken larva.More complicated is the situation when the spacer mechanism becomes unusable. In this case, the repair is carried out by removing the door from the hinges and disassembling the canvas. The peculiarity of this lock is that when the door is closed, additional crossbars are extended both vertically and horizontally. Image - Do-it-yourself door lock handle repair

Any locking mechanism requires periodic lubrication

In this case, do-it-yourself repairs are easier than ever. First, open the lock. Remove all parts of the mechanism. Blow it thoroughly and use a stiff brush to remove all dust and other dirt particles that have accumulated inside. Then wipe the larger parts with a cloth. Apply a small amount of lubricant to a cotton swab and carefully work each element of the lock. Assemble it and put it in place. Check out the quality of his work.

Please note: after such processing, the key may become contaminated with lubricant for some time.

Quite often, it is required to repair the lock in the interior door. They are heavily loaded, and therefore, over time, the tongue begins to sink, the handle jams or the latch dangles.

How to repair the lock in the interior door with your own hands:

If the problem lies in a sunken latch tongue, you need to disassemble the lock and install it in place. The spring may need to be replaced.
If the handle is loose and does not retract the tongue to its original position, you need to check its fastening relative to the rotary mechanism. After that, put it in place and tighten the screws. From time to time, you need to carry out a similar procedure and lubricate the mechanism to prevent its breakdown.
When the latch sticks, you need to disassemble the part of the lock that is responsible for fixing it. The reason may be the displacement of the part, the mashing of elements, their deformation or crack. In this case, you need to replace the damaged spare part with a new one.
If there are problems with the turnkey lock, the repair is carried out according to the same principle as for the front door.Perhaps the replacement of the larva or a simple cleaning of the mechanism is required.

If all efforts were in vain, you can call the master. However, it is likely that a new lock will need to be installed.

Most locks are fairly simple mechanisms that are a collection of locking devices.

Depending on the complexity of the lock, the system may include crossbars, a larva (secret), a bolt-latch, as well as other mechanisms that ensure the movement of all its functional elements.

The most common types of locks are:

Cylinder (English) - open with a key, on one side of which there are protrusions and recesses.
Lever - a key with characteristic "blades" on a long rod is intended for it.
Cruciform - the key consists of two planes intersecting at right angles, on each side of which notches are applied.
Disk - the body of the key is made in the form of a semicircle, there are recesses on one of the sides.

According to the method of installation, locks are overhead and mortise.

The type of malfunction depends on how difficult it will be to repair door locks. Sometimes it's easier to buy a new lock than fix an old one.

The most common causes of failure:

Wrong sized counter hole.
The drawdown of the door frame, due to which there is a mismatch in the mating parts of the door lock.
Debris got inside the mechanism.
There was a violation of the geometry of the lock.
The larva broke.

If the lock cylinder is broken, you need to purchase a new one and replace the faulty mechanism. Such repairs involve the replacement of the keys to open the corresponding lock.

If the breakdown is caused by marriage or wear of large elements, it is preferable to purchase a new mechanism in a complete set. In case of breakage of small elements, such as springs, only this part can be replaced. Sometimes the unsatisfactory operation of the lock is associated with a lack of lubrication in the moving parts of the mechanism, then it is necessary to disassemble the lock and lubricate it.

Video (click to play).

The larva must be changed if the key in the lock scrolls, or, conversely, sticks. You may need to remove the lock to remove the broken key. Then they act according to the following algorithm: