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August 12, 2017 18:08

Repair Bosch grinders with their hands


  • 1 Design features angle grinder Bosch
  • 2 required tools for repair
  • 3 Dismantling grinders Bosch with his hands
    • 3.1 Removing the driven gear
    • 3.2 How to remove the pinion gear grinders Bosch
    • 3.3 How to remove the bearings from the rotor grinders Bosch
  • 4 Possible electrical faults
    • 4.1 Simple fault electrical grinders Bosch
    • 4.2 motor Check
    • 4.3 How to determine the fault rotor
    • 4.4 stator Repair
    • 4.5 speed regulators Faults
  • 5 Mechanical damage
    • 5.1 Assembling Bulgarian
    • 5.2 What kind of grease used for grinders Bosch
    • 5.3 rotor assembly
    • 5.4 Assembling gearbox
  • 6 Video repair grinders Bosch
    • 6.1 Assembly grinders Bosch
    • 6.2 How to replace bearings on grinder Bosch
    • 6.3 repaired Bosch GWS 20230

Angle grinders (angle grinders, grinders) under the German brand Bosch are characterized by high quality, reliability and durability.The main competitive advantage of Bosch angle grinders lies in the wide use of innovative techn

ologies in the manufacture of products.

But German quality can not resist the Russian negligence.Improper use of the instrument, untimely changing lubricants, carbon brushes, bearings leads to the instrument system.

To perform repair angle grinder Bosch, you can go two ways to give grinders service center or to repair Bosch grinders with their own hands.

The first option is more expensive and not always high-quality.The latter can only be achieved if the consumer a great desire to understand all by yourself.

scheme grinders Bosch will help to repair themselves.

Bosch grinders are divided into low-power up to 1000 watts, powerful and over 1000 W are labeled GWS 7-125, GWS 20-230 or others.


first 20 digits or more points on the power tool over 1000 watts.The second number 230 confirms that this is the maximum diameter of the cutting disc.

first digit 20 indicates the instrument power up to 1000 W, and the second on the maximum diameter of the cutting circle of up to 125 mm.

Design features angle grinder Bosch

construction features grinders Bosch is represented in the application of the gearbox as a support bearing the driven spur gear needle podshipnika.V Hammers Bosch driven gear is attached to the spindle shaft by compression.

The grinder Bosch low-power, which are put in gear spur gear, space for shims.This design allows you to recover from contact gears, reducing the thickness of the gasket. Helical gears at high speed tool wear significantly less spur.

Bosch angle grinders driven gear reducer work among Bulgarians most often is a dusty space.Dust is the main danger, leading to the failure of power, family practitioner and grinders.

required tools for repair

To repair grinders Bosch, no tools are indispensable.Just make a reservation, if you have a screwdriver, then it will speed up the process of disassembly and assembly tool.

But you can do a set of screwdrivers, preferably with a ratchet.Do not do without a spanner, which will unscrew the nut driving spur gear.

To remove the bearings is better to have a special puller.

Diagnostics electrical parts can be made using a tester or the device determining the short-circuit loops.

It is especially useful because it allows you to determine the fault of the rotor or stator, without removing the unit.

scheme grinders Bosch will perform the repairs yourself, and this instruction will adequately cope with any problem.

Dismantling Bosch grinders with their hands

to power its owner's knowledge and ability to disassemble the device is a mandatory task.

spoken about dismantling grinders allow yourself to carry out works such as replacement of grease, change bearings and carbon brushes.

Driving assembly grinder Bosch power over 1000 W

To disconnect the gear housing poz.821 poz.888 from the stator housing, it is necessary to disassemble (remove) the body handles Bulgarian poz.24.

this operation you must perform to get the carbon brushes poz.810 holding rotor collector.

In the second step, remove the four (4) poz.61 screws holding the gear housing and the stator.

disconnect reducer from the stator housing

Pulling the rotor together with the gearbox, proceed with the disassembly of the gearbox.

Repair grinders Bosch begins with disassembly poz.821 gear.Dismantling the gearbox begins with unscrewing 4 (four) poz.60 screws.As a rule, the factory screws screwed on sealant.We'll have to make some effort.

Just note! bolgarok Bosch have low power in the gearbox used spur gear.Bulgarians have over 1000 watts used in gearboxes helical gears.

Disassembled reducer

Removing the driven gear

After removing the cover gear, you can get a unit spur gear poz.26.

To remove the gear, it is necessary to use a press or puller.But the use of a stripper is difficult because it requires the use of special thin lips.

before removing the helical gear, check gear backlash connection, the integrity of the teeth, the contact patch.

Bosch gearbox exploded shaft

on the spindle shaft bearing is pressed onto poz.26 poz.50.If the bearing has a large backlash, noise as you scroll, dry lubricant, it is preferable to replace.

To remove the bearing, remove the pinion retaining ring and remove the bearing.If during removal of the rotor shaft assembly bearing remains in the gearbox housing, bearing dismantling is done with a hammer and a soft nastavki.

Removing the pinion gear grinders Bosch

Pinion poz.27 removed from the rotor shaft in the following order:

  • Clamp arm rotor and using open-end wrench, unscrew the nut counterclockwise poz.45 .;
  • Remove the washer poz.59 .;
  • Remove leading helical gear poz.27.

Visually check the integrity of the teeth of the gears, the contact patch.

how to remove pinion gear If the gears are worn out (slicked), has chipped teeth, they must be replaced.Moreover, the replacement gear is always done in pairs.

The grinder Bosch low power as a thrust bearing in the gearbox used needle bearing.

repair bosch angle grinders with their hands strictly follow the enclosed instructions.If you need to remove the needle bearing from the housing, without intelligence can not do.Its dismantling is carried out only in the destruction.

To get ruined bearing race, you can use a proven way.

picks tap diameter slightly larger than the inner diameter of the holder of the destroyed needle bearing.The tap is fixed in the cartridge screwdriver and screwed carefully at low speed in the clip.When the tap reaches the bottom of the gear case, it will begin to lift the clip.

A method of extracting the needle bearing cage of the blind hole

Besides needle bearing spindle shaft in Bosch grinder used two more bearing mounted on the rotor shaft.

How to remove the bearings from the rotor grinders Bosch

To remove the bearings from the rotor poz.803 grinders Bosch recommend using pullers.

bearing poz.15 near the collector is removed easily, but for removal of the bearing pos.14 from the impeller is complicated by the fact that it is necessary to perform a series of preparatory operations.

bearing poz.15 closed soft rubber socket.Similar protection poz.33 rubber covers and bearing pos.14.

Bosch Rotor assembly

To remove the bearing pos.14 need to unscrew the nut poz.45, remove spur gear poz.17 and plastic protection poz.33.Using the tool can be easily removed with the bearing of the rotor shaft.

And if not a stripper?On the revenue will come gripe, two metal strips and a hammer with nastavkoy soft metal.

Dismantling grinders Bosch

Possible electrical faults

Faults electrical grinders Bosch can be divided into simple and complex.

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simple electrical fault grinders Bosch

If you include grinders, and she refuses to work, start looking for the problem with the power supply wire breakage.Most often broken wire manifests itself in the place of entry into grinders or plug.Avoid twists, it will lead to a short circuit in the instrument.

to determine such failure is necessary to open the lid handle grinders.The Bosch grinders 1000 W cover is fixed with one screw in the end.Do Bulgarians Bosh over 1000 W lid handle is fastened by several screws.

With tester rang the food chain from the input plug pos.5 to switch.When a chain proceed to check switch operation.The Bosch grinder used simple switches, controlled switching lever.But

electrical switch contacts burn and cause refusal of work grinders.Restore contacts the plastic switch is inappropriate, it is necessary to change to a new one.

If the switch intact, using a tester check the continuity of each pin plug to each coal schetki.Pri entire Bulgarian chains should be included.If not rotate, the problem on the mechanical parts.Perhaps jamming gear or bearing failures.

motor Check

If your Bulgarian Bosch grows regardless of you begins to warm up, a spark, it is necessary to pay attention to the integrity of the rotor windings of the stator.

Involuntary set LBM speed indicates a fault in the stator windings.The integrity of the windings is checked tester, and a short circuit between turns checked by a special device.

How to rotor failure

rotor repair is a complex process that is available to masters with straight arms.

on rotor fault indicates a drop of the engine speed, the appearance at one of the long brushes sparkling trail.This is the first sign of a short-circuit armature windings.

rotor repair is preferable to perform in special workshops.And you can rewind and yourself, if you have decided to make repairs Bosch grinders with their own hands.

burnt collector Bosch

Dark rotor winding color and scorched lamella collector indicates a short circuit in the rotor circuit.The fault can only be eliminated by replacing with a new rotor.

Stator Repair

repair bosch angle grinder includes a stator and recovery.The main symptom of a failure of the stator is a spontaneous increase in running speed grinders, which can not be reduced regulirovkami.Podgorevshaya stator winding changes the color becomes darker.The stator core of a high temperature and darken.

stator rewinding easier, although here it is necessary to follow certain rules and consistency.

If you removed the cover of the stator housing, carefully inspect the state of the carbon brushes and the lamellae of the rotor collector.

Burned stator winding length of the carbon brushes should not be less than 8 mm.By the way, Bosch grinder used carbon brushes with the "shot", the device stops working grinder with a minimum length of the carbon brush.

collector slats must not have any trace of soot or wear.Nagar can be easily removed with the help of cotton wool dipped in alcohol.
Overheating of the stator and rotor short circuit

Faults Governor

The series grinder Bosh, especially low-power, set the speed controller.Access to the speed controller is performed by opening the stator housing pens, keep the same socket screws.

speed control range can be set via potentiometer, hidden in the handle panel.

faulty regulator removed easily enough, since only mounted on the guide.

Repair LBM speed control is a complex process, the implementation of which requires not only expertise, but the tools and equipment.

Speed ​​Reducer Bosch 001 If the speed regulator has failed and no new, then disconnect the leads and jumper.

Bosch regulator 01 speed circuit red shows the jumper is installed at the exit of the speed control system.

Mechanical damage

Angle Grinder Bosch is designed to perform cutting, grinding, polishing operations.Work tool in the dust at high loads particularly detrimental effect on the durability of the gear, namely its gears.

Also wear and tear of the teeth of gears, mechanical malfunctions may include destruction of the bearings and housings.Repairs grinders Bosch regarding replacement of defective bearings, restoring the body to perform simple, if there is a desire and need.

Assembling Bulgarian

grinder assembly starts with a survey of all parts, assemblies, bearings, gears.

Pre-prepare a workplace with proper and good lighting, put the tools, lubricants, wipes.

What kind of grease used for grinders Bosch

Repair Bosch ears will not be qualitative, if you change when it is performed by the is recommended to use the lubricants that offers a manufacturer of tools for high-quality lubricant grinders Bosch units.But their high price makes us look for another way out, and it is.

Domestic manufacturers of lubricants developed a special lubricant for gearboxes and Bulgarians nodes.

On quality they are in no way inferior to foreign lubricants, and are much cheaper.The only negative, our lubrication require more frequent changes.

And you can use the lubricant, made with his own hands.

rotor assembly

rotor assembly is pressing in on him bearing the impeller installation.Lubricated bearings are pressed onto the shaft with a wooden nastavki.Bearing near the reservoir is closed with rubber protection.This is a general algorithm of the rotor shaft assembly.

In some models Bosch grinder has its own peculiarities.

Bosch rotor assembly 02

Assembling gearbox

gear assembly begins with the installation in the casing of the rotor shaft.When the shaft is inserted into the body, the shaft is put on the pinion gear, the washer and fixing nut.Gear housing with the inserted shaft must be placed in the stator housing.

installing the rotor to the stator housing

When you insert into the slot bearing reservoir, press down the gear housing to the stator housing.Check ease of rotation of the rotor bearings.

The cover of the gearbox housing is mounted spindle assembly with the fitted bearing and pinion.

Installing the gear unit and the stator housing

remains to insert the cover and check the spindle shaft quality.If the shaft rotates easily by hand, it is fashionable to tighten the screws holding the cover of the rotor housing.Pre-lubricated screw sealant.

This is a general algorithm for the gear assembly.Some models repair gear grinders Bosch is slightly different.


  • Knowing the general scheme of Bulgarians Bosch, you can easily take up the disassembly tool for lubrication;