Typical malfunctions in Bosch hammers and how to remedy them

Nothing is eternal. And the most reliable Bosch perforators with time start to break. But any malfunction can be repaired by yourself, if you have a detailed manual for the performance of repair work. Below, we offer you a manual for detecting malfunctions in Bosch hammers and how to eliminate them.
The main reasons for the breakdown are:

• inaccurate work with the tool;
• improper storage of a perforator;
• heavy loads when working on working tools when chiselling or drilling;
• tool overheating;
• continuous operation without interruption;
• non-observance of the terms of maintenance.

Conditionally faults can be divided into mechanical and electrical.

Next, we'll look at the malfunctions by their belonging, dividing into faults by mechanical and electrical parts.

Mechanical malfunctions of the Bosch

When mechanical faults occur in the tool, unpleasant unpleasant sound appears, sparks in the collector area increase, the smell of burning appears, the tool overheats, its power decreases depending on the duration of work and the effect on the material.

All faults are discussed in the Bosch 2-26 rotary hammer diagram. Other models, such as Bosch 2-20, 2-24, differ in the design of the intermediate shaft, installation of various drunken bearings.

The perforator stops drilling, but drills the

The perforator does not slack under load or idle for the following reasons:

• rubber rings of the drummer, striker, piston;
• collapsed bearing race;
• collapsed cylinder, kick barrel of the impactor;
• cut the slots of the clutch located on the intermediate shaft;

The perforator has stopped drilling, but hollows the

. The main reasons for the punching, but not drilling, are:

• the strength of the conical spring that clamps the clutch is weakened;
• retaining roller does not fix the large pinion shaft;
• does not hold the tool locking mechanism in the trunk;
• The perforator does not drill or drill.

The main reasons for not punching and drilling the punch are:

• cut teeth on the small gear wheel of the rotor or on the big gear of the intermediate shaft;
• the electric motor of the perforator does not work;
• there is no power to the electric motor of the perforator.

Now let's talk about everything in order

Let's consider the options in which the puncher does not chisel, but drills

Wear of rubber rings on the drummer, striker, piston.

This reason appears gradual, as the rubber rings wear out. First, the impact weakens, then disappears altogether.

The fault is eliminated by replacing the specified rubber rings with new ones.

For any repair of punchers, its components, all rubber products are subject to replacement.

Roller bearing race( drunk bearing)

Collapsed When the drill bearing is damaged, pos. 830, the rotational movement of the intermediate shaft can not be converted into the cylinder's forward motion in the impactor.

Removed by completely replacing the rolling element bearing.

Cylinder, drummer, drum striker of impactor mechanism

There are times when the drummer in the cylinder poses 26, which leads to the destruction of the cylinder and the impossibility of creating air pressure in the barrel of the impactor. And the second reason: the destruction or breakage of the striker pos.28, leading to the distortion of the detail and the inability to transfer the shock pulse.
Breakdowns are eliminated by a complete replacement of the failed parts.

Cut the slots of the clutch clutch pos. 67, installed on the intermediate shaft

. The malfunction is eliminated by repairing the clutch or completely replacing it.
When the repair is performed, the clogged teeth are clipped onto the clutch. To correct this defect, use a round filter and drill. The clutch is clamped in the hand, and the profile of the teeth is straightened with a drill with the corresponding nail file. Similarly, the splines are also finished on the intermediate shaft.

Consider the options in which the perforator drills but does not groove

The strength of the conical spring pressing the clutch

is weakened When the spring force of the spring of pos. 50 decreases, the clutch slips on the intermediate shaft without transferring the rotation from the smallspur gear on the big gear pos.22 shaft barrel pos.821 hit mechanism. By the way, on different models Bosch clutches are arranged differently.

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Locking roller does not fix the big pinion of the shaft of the barrel

The big gear pos.22 is attached to the shaft of the shaft pos.01 with the roller pos.88, pressed against the shoulder of the shaft by a conical spring pos.80 andis fixed by a lock ring pos.85.

The reason can be a weakening of the force of the conical spring pos.80, the destruction of the lock ring pos.85, the loss of the locking roller pos.88.

The drill does not hold the tool locking mechanism in the gun punch

Two types of cartridges are used in Bosch hammers: SDS-plus and SDS-max. The difference in the design of the locking mechanism.

The reason for the deterioration of the antennae of the raster sleeve of the cartridge, which leads to the impossibility of transferring the shock pulse to the working tool of the perforator.

Let's consider the variants in which the punch drill does not drill and do not bite

Cut the teeth on the small gear wheel of the

rotor. The gears are rotated with the teeth cut off on one of them, often on a small one.

When the work tool is jammed and the clutch is malfunctioning, the teeth of the gears are worn or completely destroyed on the shaft of the perforator and the intermediate shaft.

In this case, the rotor or the big pinion of the intermediate shaft changes completely.

The perforating motor

does not work The reasons for the non-working electric motor can be:

• short circuit in the rotor, stator;
• destruction of carbon electro-brushes;
• loosening of the brush holder;
• burnout of the lamellas on the rotor manifold;
• breakage of the windings of the rotor or stator.

The above faults are repaired by repair( winding the winding manually, replacing the collector and unscrewing the leads of the windings) or by replacing the rotor, stator, and electric brush with new ones.
Most of the faults in the electric part of the Bosch 2-26 rotary hammer are confirmed by the increasing sparking in the collector area.

The length of serviceable electric brushes can not be less than 8 mm. When replacing one brush, the second one should change automatically.

Windings of the rotor or stator can be rewound themselves to their hands at home.

There is no power to the Bosch Hammer Motor

The cause of this malfunction is the broken wire that supplies power to the motor. Most often, the break occurs at the point where the cable enters the punch. The wire should be replaced with a new one or repaired. The fault can be determined with a tester. If there is no tester, the fault can be found using the power phase and a screwdriver with an indicator neon lamp. By connecting the power wires one at a time, on the other end you determine with the help of a neon screwdriver the presence or absence of a phase.

The button for turning the puncher does not work. Defined by the short-circuit tester.

Most often, the failure of the button of the perforator results in a short circuit of the filter capacitor. It is best to replace the button with a new one.

General electrical malfunctions of the Bosch 2-26 gun

The electric rotary hammer failure is accompanied by the appearance of the smell of burning, strong heating of the instrument during operation, the appearance of a large spark in the rotor rotor collector area,reverse.

The operation of the puncher is affected by the condition of the carbon brushes, the reliability of the fastening of the brush holders and their correct installation.

The smell of burning occurs when the stator or winding of the rotor is shorted.

The drop in the power of a puncher when the load is increased is typical for a break in the rotor windings or for a short length of carbon brushes.

The shortest interturn closure in the stator or rotor leads to the heating of the perforator.

The large sparking in the collector area is caused by the interturn closure of the rotor or by the burnout of the collector sipes.

The operation of the reverse switch is disrupted by the ignition of its contacts.

But the main reason for all failures, untimely performance of technical maintenance and replacement of carbon brushes.

Carbon brushes require replacement after 70 hours of operation or when worn down to 8 mm in length.

. We have given the main reasons for the failure of the Bosch perforators.
Perhaps, we have not described all the breakdowns of Bosch perforators.

If you know of other problems with the Bosch 2-20, 2-24, 2-26, please share with us.

I wish you success!

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