Build Daily


August 12, 2017 18:08

Typical faults in the Bosch rotary hammers and their solutions


  • 1 Mechanical faults perforator Bosch
    • 1.1 Punch ceases to peck, but drills
    • 1.2 Hammer stopped drilling, but hews
    • 1.3 Consider options that punch does not hollowbut drills
      • 1.3.1 Collapsed cage roller bearing (bearing drunk)
      • 1.3.2 been destroyed cylinder, striker, striker barrel percussion mechanism
      • 1.3.3 Cut slots poz.67 clutch coupling seton the intermediate shaft
    • 1.4 Consider options that hammer drills, but not hammer
      • 1.4.1 Weakened power of conical springs, pressing the clutch
      • 1.4.2 Locking clip does not fix the big shaft geartrunk
      • 1.4.3 not holding a drill tool locking mechanism in the trunk punch
    • 1.5 Consider options that do not hammer drill and hammer
      • 1.5.1 Cut teeth on the small gear rotor
      • 1.5.2 not working motor perforator
      • 1.5.3 No power to the motor perforator Bosch
  • 2 Common electrical problems perforator Bosch 2-26

nothing is eternal.And the most reliable Bosch rotary hammers begin to break down over time.But any malfunction can be repaired with his own hands, if we have a detailed guide for the implementation of repair works.Below we offer you a manual on the detection of faults in the Bosch rotary hammers and methods to address them.

main cause of damage are:

  • sloppy work with the tool;
  • improper storage of the gun;
  • heavy loads at work on the working bodies when chiselling or drilling;
  • overheating of the tool;
  • continuous operation without interruption;
  • delays in maintenance.

Conditionally fault can be divided into mechanical and electrical.

Next, we consider the fault to their owners, dividing by a fault on the mechanical and electrical parts.

Mechanical faults perforator Bosch

When a mechanical fault in the instrument operation appears outsider unpleasant sound, enhanced by sparkling in the reservoir area, there is a smell of burning tool overly heated, its power falls depending on the duration of work and the impact on the material.

All faults consider the diagram perforator Bosch 2-26.Other models, such as the Bosch 2-20, 2-24, characterized by the design of the intermediate shaft, the installation of various drunken bearings.

Punch ceases to peck, but drills

Hammer hammer is not under load or idle for the following reasons:

  • worn rubber rings the hammer, the hammer, the piston;
  • collapsed cage of the rolling bearing;
  • collapsed cylinder firing pin striking mechanism stem;
  • cut the splines of the clutch mounted on the intermediate shaft;

ceased drilling puncher, but hews

The main reasons for which the punch hammer, but do not drill it:

  • The strength of the conical spring, presses the clutch;
  • retaining clip does not fix a trunk large gear shaft;
  • not locking mechanism holds the instrument in the trunk;
  • Puncher not hammer and drill.

main reasons for which are not punch or hammer drills are:

  • cut teeth on the small gear of the rotor or on the large gear of the intermediate shaft;
  • not working electric punch;
  • no power to the electric punch.

Now everything in order

Consider options that do not punch hammer, but drills

Wear rubber rings on the striker, striker, piston.

This cause appears gradually as the wear of the rubber rings.First blow weakens and then disappears altogether.

fault is eliminated by replacing these rubber rings with new ones.

Any repair drills, its components, must be replaced all the rubber products.

Kit rubber O- rings to punch Bosch 2-26

Kit rubber O-rings to punch Bosch 2-26

Collapsed cage roller bearing (bearing drunk)

With the destruction of drunken bearing poz.830 rotary motion of the intermediate shaft can not be converted into linear motion of the cylinderin the hammer mechanism.

eliminated by the complete replacement of the rolling bearing.

Friction bearing


been destroyed cylinder, striker, striker barrel percussion mechanism

There are cases when a drummer in a snack poz.26 cylinder, which leads to the destruction of the cylinder and the inability to create the air pressure in the hammer mechanism trunk.And the second reason: the destruction or breaking striker pos.28, leading to curvature of the details and the inability to transfer the shock pulse.Failures are eliminated
complete replacement of defective parts.

The firing pin is stuck in the piston , the piston destruction

striker stuck in the piston, the piston destruction

Cut slots poz.67 coupling clutch, mounted on the intermediate shaft

fault persists clutch repair or its complete replacement.
the production of repairs on the clutch zapilivaem crafted teeth.To correct this defect using a round needle file and drill.The sleeve is clamped in his hand and a drill with a suitable needle files straighten teeth profiles.Similarly, modify the slots and on the intermediate shaft.

Restoring the intermediate shaft coupling clutch teeth

Recovery coupling intermediate shaft coupling teeth

Consider options that hammer drills, but not hammer

Weakened power of conical springs, pressing the clutch

When poz.50 spring pressure force is reduced, the clutch is slipping on the intermediate shaft, without transmitting the rotation of the small spur gear on the large gear shaft barrel poz.22 poz.821 impact mechanism.Incidentally, the different models Bosch clutch arranged differently.

Details node transmitting torque and forward momentum

transmission unit Details Torque and sustained momentum

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Locking clip does not capture the large gear shaft barrel

poz.22 large gear mounted on the shaft barrelpoz.01 poz.88 roller is pressed against the shoulder of the shaft and the conical spring poz.80 fixed lock ring poz.85.

reason may be the weakening of the conical spring force poz.80, the destruction of the locking ring poz.85, loss of the fixing roller poz.88.

The pinion shaft poz.22 poz.01 trunk poz.821 impact block unit

poz.22 pinion shaft poz.01 trunk poz.821 unit shock unit

not holding the drill mechanism in the trunk lock punch tool

The Hammers Bosch uses two types of cartridges: SDS-plusi SDS-max.The difference in the lock mechanism construction.

reason wear antennae scanning sleeve chuck that makes it impossible to transfer a shock pulse to a working tool punch.

The tool shank perforator Bosch 2-26 rounds

tool shank perforator Bosch 2-26

cartridges Consider options that do not hammer drill and hammer

Cut teeth on the small gear rotor

There cranking gears from the shearing teeth on oneof them, usually at low.

When jamming of the working tool, and malfunction of the clutch there is a deterioration or complete destruction of the gear teeth on the shaft and punch the intermediate shaft.

In this case, changing the rotor completely or large gear of the intermediate shaft.

Rotor punch bosch 2-26 with cut slots

perforator rotor bosch 2-26 with cut slots

not working motor perforator

reasons for not operating the motor can be:

  • a short circuit in the rotor, stator;
  • electrobrushes destruction of coal;
  • easing mounting brush holders;
  • burning slats on the rotor collector;
  • open rotor windings and stator.

fixes the fault repair (rewinding manual winding, replacement of the collector and Cable conclusions windings) or replacement of the rotor, stator, coal electrobrushes new.
main part of the troubleshooting electrical perforator Bosch 2-26 confirmed the increasing sparks in the collector region.

length serviceable electrobrushes may not be less than 8 mm.When replacing a brush, the second is to change automatically.

rotor windings and stator can be rewound his hands alone at home.

Burnt rotor collector Hammers Bosch

Burnt punch rotor collector Bosch

No power to the motor perforator Bosch

reason for this fault in the open circuit, supplies power to the motor.Most often it occurs in an open place at the entrance of the cable punch.The wire should be replaced by new or repaired.The fault can be determined using a tester.If there is no tester, the fault can be found with the use of phase and power screwdriver with neon lamp indicator.By connecting in turn the power wires at the other end using a screwdriver neon determine the presence or absence of phase.

not working power button punch.Determined to short-circuit tester.

The most common damage to the punch button causes a short circuit filter capacitor.It is best to replace the button on a new one.

The power cord inlet pos.5 tool

pos.5 power cord is at the entrance of the tool

Common electrical problems perforator Bosch 2-26

Failure of punch for the electrical part is accompanied by a burning smell, strong heating tool during operation,the emergence of large sparks in the vicinity of the rotor collector punch bad tripping reverse switch.

On perforator work affects the state of the carbon brushes, brush holders and mounting reliability of their proper installation.

smell of burning occurs when a short-circuit rotor or stator windings.

Fall power puncher with increasing load characteristic at breakage in the rotor windings or with a small length of the carbon brushes.

to the heating punch often leads interturn short circuit in the stator and rotor.

great sincerity in the reservoir area of ​​the rotor caused by the inter-track circuit or burnout lamella collector.

Violation of the reverse switch is due to the burning of his contacts.

But the main cause of all the failures, untimely fulfillment of technical maintenance works and replacement of carbon brushes.

carbon brushes need to be replaced after 70 hours of operation or when worn up to 8 mm in length.

General view of the carbon brushes and the dimensions of the perforator Bosch

General view of the size of the carbon brushes and the perforator Bosch

We have led the main reasons for exit drills Bosch down.
We may not describe all the breaking hammers Bosch.

If you know of other faults in punchers Bosch 2-20, 2-24, 2-26, share with us.

Good luck to you!

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