Step-by-step instructions for repairing a crane box


The mar­ket for san­i­tary prod­ucts pleas­ant­ly sur­pris­es with its diver­si­ty. It is easy to pur­chase a new device to replace the failed one. Often the cause of the break­down is a prob­lem with the crane box, which you can repair your­self.

The device and principle of operation of the crane box

The faucet box, or in oth­er words, the valve head of the mix­er, is a lock­ing mech­a­nism with which you can not only sup­ply and shut off water, but also reg­u­late its tem­per­a­ture and pres­sure.

Scheme of the struc­ture of the crane box

So, the device con­sists of ceram­ic and brass parts:

  • jumper (met­al case), where there is a mount­ing thread and a rub­ber seal;
  • fit­ting (pipe) locat­ed in a met­al jumper;
  • stem or rotary mech­a­nism, the design of which depends on the shape of the valve head;
  • wash­er, which fix­es its loca­tion in the crane.

Some man­u­fac­tur­ers pro­vide their mod­els with a fat cham­ber, through which smooth oper­a­tion is achieved, as well as an increase in the dura­tion of the mix­er.

By exter­nal influ­ence on the valve, the shut­ter, which is locat­ed in the rotary stem, is set in motion.

Varieties of model structures crane-box

The mod­ern plumb­ing mar­ket offers a wide selec­tion of mod­els of this device. To an ordi­nary non-spe­cial­ist, at first glance it may seem that the details are the same, but this opin­ion is erro­neous.

Crane axle mod­els


Crane box­es accord­ing to the vari­ant of the water lock­ing ele­ment are clas­si­fied as fol­lows.

Rubber (worm)

When the mix­er valve rotates, a rod is set in motion, which press­es or releas­es the rub­ber gas­ket. She, in turn, opens or clos­es the faucet valve seat, and with it reg­u­lates the water sup­ply.

The advan­tages of this type are:

  • an abun­dance of spare parts for each type of mix­er;
  • repair of a worn-out crane box can be done with your own hands;
  • it is pos­si­ble to man­u­fac­ture rub­ber gas­kets inde­pen­dent­ly;
  • afford­able price.

The dis­ad­van­tages of this type include:

  • short ser­vice life;
  • the need for a large num­ber of valve turns;
  • over time, the smooth­ness of the ride decreas­es, and noise or creak­ing also appears.

Ceramic (disk)

Based on the name, it is clear that ceram­ics are used in the design. How­ev­er, only disks are made from it, which are respon­si­ble for sup­ply­ing or shut­ting off water.

The advan­tages include:

  • dura­bil­i­ty;
  • a rel­a­tive­ly small num­ber of rev­o­lu­tions required to open or close the mix­er;
  • smooth run­ning, silent.

The main dis­ad­van­tages are the need to use fil­ters for water purifi­ca­tion, as well as the high cost of the ceram­ic mech­a­nism.


At the heart of the water lock­ing device, a met­al ball is used, which is respon­si­ble for the sup­ply of water.

Pos­i­tive aspects of the mod­el:

  • long ser­vice life;
  • speed, noise­less­ness when open­ing and clos­ing the mix­er.

Neg­a­tive sides:

  • high sen­si­tiv­i­ty to water qual­i­ty;
  • unsuit­able for recov­ery.

Before repair­ing (replac­ing) the axle box, it is worth dou­ble-check­ing which mod­el of the axle box is installed in the mix­er. Know­ing this infor­ma­tion will allow you to buy the right spare part, there­by speed­ing up the repair work.

Typical breakdowns


The mix­er needs to be repaired if:

  • it leaks when the valve is closed;
  • liq­uid seeps out from under the valve;
  • uneven jet of water — the appear­ance of “spit­ting”;
  • the fly­wheel is not fixed in the extreme posi­tions.
Mix­er leak

Mal­func­tions of water lock­ing devices occur for the fol­low­ing rea­sons:

  • Wear of seal­ing parts. The rings lose their elas­tic­i­ty, as a result of this, depres­sur­iza­tion occurs, and then leaks.
  • The accu­mu­la­tion of dirt between the discs, and as a result — a loose con­nec­tion of the plates, fol­lowed by the flow of water.
  • Abra­sion of ele­ments between the stem and body. The prob­lem is extreme­ly rare; in this case, it is nec­es­sary to replace the entire mech­a­nism.
  • Abra­sion of ceram­ic plates. The break­down occurs due to poor qual­i­ty water.
  • Has become attached to the body of the crane box.

To find out the caus­es of mal­func­tions, you need to remove the mix­er and dis­as­sem­ble it.

Necessary and sufficient tool

In order to dis­as­sem­ble the valve head, to replace worn parts, you need to have the fol­low­ing tools at hand:

  • gas or adjustable wrench;
  • screw­driv­er set;
  • pli­ers;
  • knife;
  • cap keys;
  • fum tape;
  • water­proof lubri­cant.
Set of tools


It is pos­si­ble to accu­rate­ly select the parts nec­es­sary for repair, as well as to find out the rea­son why water is drip­ping, only after dis­as­sem­bling the valve.

Removing the water stop

The dis­man­tling of the prob­lem­at­ic mech­a­nism is car­ried out in the fol­low­ing sequence:

  1. The valve head fly­wheel is dis­man­tled by unscrew­ing the lock­ing screw hold­ing the part.
  2. Using a gas or adjustable wrench, remove the mix­er apron.
  3. Oppo­site to the course of the hour hand, the axle box is unscrewed (using an adjustable or wrench).
Dis­as­sem­bled mix­er

Then the thread­ed parts of the mix­er are cleaned, and inspec­tion and trou­bleshoot­ing are per­formed.

Valve head repair

Sev­er­al types of gas­kets are used in both worm and ceram­ic valve heads. Some­times improp­er use leads to wear and then to the appear­ance of a leak.

Gasket replacement

In order to repair the lock­ing mech­a­nism, it is not nec­es­sary to dis­as­sem­ble the mix­er, it is enough to remove the rub­ber ring from the seat. After that, the new gas­ket is treat­ed with a water­proof lubri­cant and mount­ed.

Valve head gas­kets


If it so hap­pened that the right mate­r­i­al is not at hand from which a new gas­ket can be cut, then the leak can be elim­i­nat­ed for a short time using sil­i­cone sealant. The prob­lem­at­ic part is cov­ered with a thin lay­er of sil­i­cone, allowed to dry, and then rein­stalled.

Replacing the pressure washer

The sec­ond gas­ket made of capro­lon or flu­o­ro­plas­tic serves to com­pen­sate for the gaps between the ceram­ic plates. Dur­ing oper­a­tion, the mech­a­nism is sys­tem­at­i­cal­ly sub­ject­ed to loads, under the influ­ence of which the wash­er becomes thin­ner and water seeps through.

To replace it, the axle box must be dis­as­sem­bled. It is nec­es­sary to remove the retain­ing ring, remove the stem and dis­man­tle the wash­er. All removed parts are cleaned, lubri­cat­ed with spe­cial grease and assem­bled.

Replac­ing the pres­sure wash­er

If dur­ing the restora­tion work it was not pos­si­ble to find a suit­able wash­er, then you can “increase” the thick­ness of the worn one. To do this, glue tape or put a plas­tic wash­er, which will elim­i­nate the flow of liq­uid for a short peri­od of time.

Extraction of foreign elements

In the event that the mix­er is leak­ing due to the accu­mu­la­tion of rust or debris between the plates or discs, the crane box must be com­plete­ly dis­as­sem­bled. All its ele­ments should be thor­ough­ly cleaned. Plates need to be metic­u­lous­ly inspect­ed. If deep scratch­es are found on them, it is bet­ter to replace the parts to avoid water leak­age.

It can be dif­fi­cult to find new plates iden­ti­cal to dam­aged ones. Under such cir­cum­stances, you can try to grind the old ones. Fine-grained sil­i­con car­bide or alu­minum oxide pow­der is suit­able for this. One of these prod­ucts is mixed with tech­ni­cal oil. The result­ing paste is applied in a thin lay­er on a piece of glass, and then you can start grind­ing. Paste must be added until the desired effect is obtained.

When the dam­aged areas are sand­ed, the plates must be rubbed togeth­er, rinsed again and the mech­a­nism is mount­ed.

Rubber Crane Repair


Worm axle box­es leak for many rea­sons. Basi­cal­ly, the faucet spins or leaks due to rub­ber gas­ket fail­ures and phys­i­cal wear. If water oozes between the mix­er and the faucet box, then a new rub­ber ring must be installed. In the event that the faucet itself gave a leak, it is nec­es­sary to replace the seal­ing cuff.

The order of work is as fol­lows:

  1. the mix­er is dis­man­tled and dis­as­sem­bled (the same as for devices with ceram­ic plates);
  2. parts are cleaned and washed;
  3. the retain­ing screw is unscrewed and the prob­lem­at­ic gas­ket is removed;
  4. cuff is installed, lubri­cat­ed and assem­bled.
Dis­man­tling the mix­er

If it was not pos­si­ble to find an iden­ti­cal gas­ket, then the pro­trud­ing edges can be care­ful­ly trimmed.

Recommendations of experts and possible difficulties

By adher­ing to the fol­low­ing sim­ple tips from experts, every­one can restore the mix­er to work­ing capac­i­ty.

  • If, dur­ing dis­man­tling, it is not pos­si­ble to remove the stuck crane box, then it should be treat­ed with vine­gar or a solu­tion of cit­ric acid, and left for a cou­ple of hours. The chem­i­cal reac­tion will loosen the deposits and allow the mech­a­nism to be pulled out.
  • It is pos­si­ble to increase the ser­vice life of the mix­er with care­ful han­dling and instal­la­tion of water fil­ters.
  • If it is not pos­si­ble to pur­chase spare parts, then the leak can be tem­porar­i­ly elim­i­nat­ed with the help of sil­i­cone sealant. A thin lay­er of sil­i­cone is applied to the prob­lem­at­ic gas­ket and a crane box is installed. This sim­ple and uncom­pli­cat­ed method is not suit­able for long-term oper­a­tion.
  • When assem­bling the device, ceram­ic discs must not be turned over, as the sides have lapped sur­faces that ensure tight­ness.
  • To avoid scratch­es when dis­as­sem­bling the mix­er with your own hands, you can wrap it with a cloth.
  • Buy­ing a mech­a­nism in spe­cial­ized plumb­ing stores can cost a lit­tle more, but the qual­i­ty of the goods is much high­er.
  • Dur­ing the replace­ment of the gas­ket, it is nec­es­sary to inspect the mix­er for chips and cracks, the for­ma­tion of which indi­cates the need to replace the entire mech­a­nism.

Thus, it is quite pos­si­ble for every­one to repair the crane box and there­by restore the mixer’s per­for­mance with their own hands, sub­ject to the require­ments and rec­om­men­da­tions described in this arti­cle.


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