Peculiarities of different brands of chain saws repair

Danaaya article suggests ways to find faults in different models of grinders and repair angle grinder (angle grinder) with their own hands. Here you can find answers to questions about the order of disassembly of the reducers of bolsters of the most popular models, replacement of gears, bearings and their repair. Recommendations on how to press and press out gears and bearings, repair methods and tools are given.

In addition to common faults, angle grinders of different brands also have their own peculiarities. This comes not only from the differences in the design of screwdrivers, but also from the materials and components used.

It is also important who made the tool. Knowledge of the peculiarities in the design of the grinders allows you to repair the angle grinder with your own hands qualitatively and quickly. The following information will help to perform repairs of any brand of angle grinder.

Along with original tools, the construction market is flooded with cheap knockoffs. And don’t think that fakes are made exclusively in China. Power tools from Chinese manufacturers in quality are not inferior to manufacturers from European countries or Southeast Asia.

Quality tools from Chinese manufacturers pass through several stages of control for European customers. Chinese manufacturers do not control tools for third countries. But the tools are made on the same lines, in the same factories, by the same people. That’s why there is such a difference in price.

To make a repair angle grinder with your own hands, you must have a diagram of the angle grinder and understand it. Bosch angle grinder repair is different from Interskol angle grinder repair. And then there is the angle grinder under the brands Makita, Hitachi, Metabo.

Grouping faults by mechanical part angle grinder

For quality and effective repair of the angle grinder, you will need the simplest tools, which almost every diligent owner has.

Availability of an electric screwdriver will greatly facilitate the disassembly procedure of the angle grinder. But, in its absence, you can easily get by with just different screwdrivers. It is desirable that they have a ratchet mechanism.

To unscrew the nut, which attaches the leading bevel gear, you will need a wrench, called a spanner.

To disassemble the bearing, you can’t do without a special puller.

Perform a diagnosis of the electrical component of the device to be repaired, using a tester. There is also a special device that determines the short circuit of turns. This device is very convenient, because you can diagnose a breakdown in the stator, or rotor, without having to remove the node.

Be sure to have a diagram of the structure of the grinder. Knowing the location of the main components will greatly facilitate the disassembly of the mechanism, repair, or replacement of unusable parts.

Peculiarities of pressing a bearing on the engine armature

After you have successfully removed the bearing from the armature, it is necessary to carry out a number of necessary manipulations before reassembling the equipment. If you are fitting new parts, make sure they match the old ones exactly in width as well as the inside and outside diameter. It is important that no dirt or dust gets into the product during mounting, as this can lead to corrosion, chipping and various types of damage. The bearing is mounted on the armature using a metal tube which must first be lubricated. It is important to note that during pressing that there is no distortion. Such nuances should also be observed:

  • Lubricate bearings with a special thick substance. It can be moisture-resistant;
  • Only ½ (for machines with up to 300 rpm) or 1/3 (for higher speed machines) of the bearing chamber should be filled with grease. Do not put more substance, because all the extra is still squeezed out during rotation.

How to determine the malfunction of an anchor angle grinder

A serviceable rotor for the Makita 9069 MAX angle grinder. 220Volt photo

One of the operational advantages of asynchronous collector motors is that they maintain spindle speeds as the load changes. That is why it is practically impossible to determine the operation of the angle grinder by external signs (rotational speed, tone of sound during operation). The main factor here will be the temperature of the housing angle grinder, the increase of which is not immediately noticeable when working with gloves.

It is the high temperature that causes melting of the insulation on the rotor windings. The motor begins to run intermittently and eventually stops. If the angle grinder overheats, the contacts between the rotor windings and the collector can fall off, causing a break in the electrical circuit. The presence of an inter-turn short circuit of the windings makes it possible to rotate the shaft in different directions.

In the presence of increased sparking (as a cause of inter-turn short circuit of the rotor windings or poor contact with the collector) in the brush-collector assembly, you should check the electrical work of the angle grinder.

Diagnosis begins with visual inspection of all components of the angle grinder. Consecutive disassembly allows a complete inspection of all components from all sides. The armature, which has been removed from the angle grinder, should be inspected under a bright light. The melted wires with traces of burning, broken wires, disturbances in the winding connections. the presence of such defects requires repair of the rotor or its replacement. You can also pay attention to the specific smell that appears from burnt insulation.

remove, bearing, angle, grinder

If the external inspection did not produce results, the search for the causes of faults continues with the help of testing of electrical circuits with devices (multimeter, short-circuit indicator and others).

How to replace the bearing in the engine at home?

Such an instrument should be used with care, following all the rules. Perform preventive maintenance in good time, check that all components in the appliance are functioning correctly.

If you stop paying attention to small signs, the mechanism will break down quickly. But even with proper operation, breakdowns sometimes occur.

In this article we’ll find out what faults can occur and whether you can fix them all yourself.

A lot of problems can be solved with your own hands at home. The only exception are problems with the engine. It takes some experience and knowledge. I will tell you how to find out what is broken and how to fix it.

Peculiarities of pressing the bearing on the motor armature

After you have successfully removed the bearing from the armature, you must carry out a number of necessary manipulations before reassembling the machine. If you are installing new parts, make sure that they are exactly the same width and inner and outer diameter as the old bearings. It is important that no dirt or dust gets inside the product during mounting, because it can lead to corrosion, chipping and other damage. Removing the gear from the motor shaft of an electric screwdriver to the entry how to remove the gear from the shaft. Putting the bearing on the armature is done with a metal tube, which must first be lubricated. It’s important to make sure that there is no misalignment during the pressing process. The following nuances should also be observed:

remove, bearing, angle, grinder
  • Lubricate the bearings with a special thick substance. It can be moisture-resistant;
  • fill only ½ (for equipment with up to 300 rpm) or 1/3 (for higher speed tools) of the bearing chamber with grease. It is not necessary to superimpose more substance, because all the superfluous will be squeezed out during rotation all the same.

Sometimes the process of placing the bearing on the armature is simplified by preheating it in boiling oil. However, you need to be very careful in this case and make sure that the part is not heated above one hundred 0C.

Knowing how to remove the bearing from the armature of an angle grinder

, If you use a drill, torch or vacuum cleaner, you can repair the machine, replace parts or do preventive maintenance yourself. This will significantly save the family budget. And all the necessary parts for replacement can be purchased inexpensively in the online store “ToolParts”. You can find a wide range of accessories at affordable prices.

Disassembly procedure for a Sparky angle grinder

Regardless of the power of Sparky bevel cutters, the order of disassembly is virtually the same.

Disassembly begins with the removal of carbon brushes. They can be easily removed by removing the housing cover or the brush holder guard.

The point is that to remove the rotor from the stator housing the carbon brushes prevent the removal of the rotor by rubbing against the lamellae of the collector.

The next step is to separate the gear case and stator housing. You only need to remove the four screws that hold the gearcase and stator housing together.

To disassemble the gearbox housing, you need to remove the gearbox cover by removing the four screws. The driven gear shaft assembly is installed in the gearbox cover. We already saw how to disassemble the idler shaft assembly.

The electric part is even easier to disassemble, because there are even fewer parts.

The carbon brushes are mounted in brush holders and secured with special clamping springs. Taking out the brushes when repairing, remember the places and directions of their installation. Brushes wear unevenly. And the wear of the brushes is affected by the rotation angle of the rotor.

Repair of the gearbox

When disassembling the gearbox, remember that you must remove the brushes before removing it together with the rotor from the housing.

How to remove the driven (planetary) gear wheel of the angle grinder: remove the retaining ring and gently tap on the shaft from the side of the gear wheel. it should come off easily. If the pinion is pressed on the shaft, a puller or improvised tools are needed to press the shaft out of the cover.

How to remove the bevel (pinion) gear with an angle grinder armature: you need to unscrew the lock nut on the shaft by the gearbox and without excessive force to squeeze the anchor from the gear housing with an improvised lever.

Assemble in reverse order with all surfaces thoroughly cleaned and grease replaced.

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