How to Disassemble a Bosch Angle Grinder Reducer

Parsing an angle grinder does not require special locksmith skills; it does not cause serious difficulties. However, the work must be done very carefully and with utmost care. How to disassemble an angle grinder can be read on the Internet pages. Many sites show videos with detailed workflow. It is necessary to disassemble the angle grinder, not only when it is out of order and the replacement of any part is needed, it must also be done to clean the tool from dirt.

How to Disassemble a Bosch Angle Grinder Reducer

If the angle grinder breaks down, the first step is to disassemble it and thoroughly clean it, in most cases the tool starts to work.

  • dimensions;
  • form;
  • quality.

However, all models of any manufacturer have the same technological assembly. All angle grinders are equipped with the same set of parts.

The main modules used

  1. Housing, usually made of special impact resistant plastic.
  2. Powerful electric motor.
  3. Quality gearbox.
  4. Smooth start.
  5. Motor switch.
  6. SJS system. The presence of the system enables the tool to work smoothly without jumps. In addition, it turns off the angle grinder in case of jamming of the disk, minimizes vibration. It saves the operator from serious injuries.
  7. Protective cover.
  8. Additional handle. With it, you can hold the angle grinder during work. This handle can be installed in a variety of positions, which gives the tool versatility.
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What may be required for work

The disassembly process of an angle grinder requires several tools:

  • spanners;
  • screwdrivers;
  • pliers;
  • vise;
  • hammer;
  • grease;
  • rags;
  • gas key.

The difficulty of disassembling the angle grinder is due to the fact that the parts have a very tight contact. This allows you to cope with the highest loads. Details during operation do not shift, and oscillatory movements do not occur. Of course, the disassembly is best done by the master, but you can try to do everything yourself with maximum accuracy.

Tools necessary for work: round pliers, ruler, vernier caliper, pliers, electric drill, steel brush, megger.

Before starting to disassemble the angle grinder, it is necessary to prepare the workplace by removing all unnecessary parts from the workbench. A clean table will make it possible not to accidentally lose any small detail.

Video: How to Disassemble a Bosch Angle Grinder Reducer


At the first stage, the bolt holding the casing is unscrewed. It is very easy to remove, there are no particularly tight joints here. Then you need to unscrew the screw, remove the plastic plate. The outer casing must be shifted towards the cord.

Basically, all models of grinders have a variety of devices. However, the common detail is an electric motor, which includes:

Another required part of an angle grinder is a gearbox designed to control power and speed. The electric motor together with the gearbox is mounted in the housing.

Gear reducer

Four bolts hold it. They need to be unscrewed and, with extreme caution, remove the gear from the casing with an angle grinder. Disassembling the gearbox is necessary to clean it and replace worn parts. This is one of the most important components of the angle grinder, which experiences enormous loads during operation.

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It includes:

  • housing;
  • large gear;
  • driven gear;
  • bearing. It must be lubricated to reduce friction.

To get the rotor out of the gear case, it is necessary to unscrew the nut that holds the rotor. Take out the rotor with a special puller. Such an operation is associated with some difficulties, so if there are no special skills, it is better to provide this work to professionals. There is no way to do without a puller.

I must say that for the simple removal of dirt, such a detailed disassembly is not required. It is only needed to replace a worn bearing or a rotor that has become unusable.

To remove the anchor, you first need to remove the brushes and gearbox, carefully pull out the anchor, holding it by the gear.

This operation will require some effort. Removing the anchor from the hull must be done very carefully, as it breaks easily.

When during operation there is strong sparking, a large heating of the case, you just need to get the anchor to clean the collector. The device will be ready for use again.

How to disassemble the gearbox correctly: recommendations

When the gearbox completely refuses to work, it needs to be completely disassembled to replace parts and thoroughly clean. To carry out work, you need to prepare a bench vise. All work is performed in a specific technological sequence:

  1. The bolt holding the gear housing is unscrewed with a wrench.
  2. The rotor body with great care is fixed in a vice.
  3. By making soft blows with a hammer, the body is removed.
  4. The rotor position is convenient for removing the bearing. The vise is clamped again.
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Having put a wooden block, the bearing is knocked out. To remove the gear from the gearbox axis:

  1. Wrap the rotor with a cloth and secure with a vice jaw.
  2. The gear wheel is also wrapped in rags using a gas key, turn it counterclockwise.

How to remove the spindle: tips

The spindle axis works in conjunction with the main gear, which in its composition has:

To disassemble the spindle housing, you must first remove the main gear, for which special tools are used.

After removing the gear, the housing is installed in a vice. Having applied a wooden block, striking it with a hammer, they carefully remove the spindle on which the bearing is mounted. Bearing removal is done as described above.

The gearbox must be disassembled regularly, especially when the tool has been subjected to intensive use. Having disassembled, they perform grease change. Most often, Litol-24 is used. I must say that the lubricant must change constantly after a certain period. This allows you to increase the gearbox life by many years, due to the reduced wear of its constituent parts.