Repair of Bulgarian Interskol with their own hands

Angle grinding machines( grinders) of Interskol are very reliables and durable. They are distinguished by good work and high reliability. But, improper operation of the tool, untimely replacement of carbon brushes, grease and bearings leads to premature failure.

Repair of Bulgarian Interskol can be performed independently.

To do this, you need to know the device Intelsk Bulgarian, the assembly diagram, the order of the execution of technological operations when disassembling and assembling ushm. To correctly perform the repair of Ushm Interskol, it is enough to study the proposed scheme and instructions.

Interskol angle grinders have recently become more and more popular not only among professionals, but also by craftsmen.

Design features of

The company Interskol is the Russian leader in the development, manufacture and sale of various power tools, recognized by world manufacturers. The products of Interskol are distinguished by ergonomics, simplicity and convenience in servicing, ecological compatibility, increased capacity.
Bulgarians Interskol are classified by the diameter of the disc: 115,125,150,180,230.
In the environment of the amateurs, the Bulgars of Interskol are very popular with their own hands of two classes: with a disc diameter of 125 mm and 230 mm.
In the presented classes there are several models that are different in power.
In the class of 125 mm there are 4( four) models of Interskol: USM 125/900, USM 125/1000, USM 125 / 1100E, USM 125/1400 EL.
In the 230 mm class, 10( ten) Interskol models are produced, differing in power. Bulgarians of Interskol class 230 are produced with a capacity exceeding 2000 W.

The Intercosol USMM 230/2300 stands for: angular grinder with a maximum wheel diameter of 230 mm, capacity of 2300 W.

For the Bulgarians Interskol Ushm 125, the driven gears on the spindle are secured by a keyed connection.
Bulgarians Interskol USM 125 are assembled in one housing, which serves as a handle.

The Bulgarians Interskol USMM 230 have a comfortable rear handle behind the case. These are powerful professional machines with two-hand construction. In angle grinders of this class, the driven gears are pressed onto the spindle shaft.

In the proposed repair instructions we will consider the schemes of two classes of Bulgarians Interskol: Ushm 125, Ushm 230.

The necessary tool for repairing Bulgarian Interskol

Repair Ushm Interskol impossible to perform without having a simple, useful tool. Repair the mechanical part of the Bulgarian Interskol to you will help a set of screwdrivers, car keys, a vice, a hammer, a press. To repair electrical circuits you will need a tester. Well, if you have the opportunity to use an IR-2 device to find short-circuited turns in the windings. From the auxiliary materials you will need lubrication, napkins, flushing liquid.

In order to perform a quality repair of the Angles grinder of the Interskol family, it is necessary to prepare a workplace, to choose the right lighting. On the floor, in a dark room, quality repairs can not be performed.

To repair the Bulgarian Interskol quickly and correctly, you need a diagram of the Bulgarian that you are going to repair.

Malfunctions in Bulgarians are divided into mechanical and electrical.

The main electrical faults of the Bulgarian Interskol

As a rule, most often the cause of the failure in the operation of the grinder is an electrical malfunction. The main percentage of the failure of Bulgarians on the electrical part is the failure of carbon brushes.

Repair of control circuits for the Bulgarian Interskol

The control circuits for the Bulgarians of different models differ slightly from each other. It all depends on the power of the instrument, the availability of innovative developments. In some Bulgarians, an electronic unit is built in to regulate the smoothness of the start-up.

Mounting circuit for control circuits for grinders Interskol Ushm 125

In the grids of Interskol USMM 125, electrobrushes pos.55 are fixed in special brush holders pos.44, which can be reached only by removing the rear cover pos.51 of the stator housing pos.

After removing the cover, it is necessary to unscrew the screws pos.50, which hold the body of the brush holder.

Wear of brushes is determined by their residual length. The length of working carbon brushes can not be less than 5 mm.

Power supply is supplied via cable pos. 53.In the places where the cable enters the bulgarian and in the plug pos. 53, the cable can break off. The fault is eliminated by replacing the entire power cord or the failed part. Scrolls are not allowed.

The power cable supplies voltage to the switch pos. 41, inserted into the housing47.To control the button of the switch there is a lever pos.46.When performing maintenance, blow the silicone lubrication lever.

Mounting circuit for control grilles of the grinding wheel Interskol Ushm 230

The power supply to the cord pos. 50 is fed to the switch pos. 46, to which the electronic unit pos. 40 is connected, the carbon brushes pos. 38 inserted into the brush holders pos.37.The electric part of the Bulgarian also includes a stator pos. 32 and a rotor pos.27.

Replacing carbon brushes on the Bulgars Interskol Ushm 230 does not require removing the back cover. It is enough to unscrew the cap of the brush holder pos. 36 and pull out the brush holder with a carbon brush. But to replace the switch, electronic unit, capacitor pos.42 can only dismantle the rear handle pos 44.45.To do this, unscrew four 4 × 16 pos.

How to repair a rotor for a bulgarker Interskol

Rotor failure occurs due to the following reasons:

• Coal brushes are damaged or broken;
• Short-circuit or breakage of windings;
• Anchor armor sipes worked:
• Rotor bearings collapsed or stuck.

Repair of the rotor requires special knowledge, tools and equipment. Preferably buy a new rotor or give it to a specialized service center for repairs. But remember, it's worth the money. For highly gifted we recommend to rewind the rotor with your own hands.

Use a puller to disassemble the bearings. But you can apply and improvised means. For example, a vise, metal strips, a hammer, a soft metal tint.

Dismounting of bearings with an AUSH anchor 125

Two bearings are mounted on the rotor pos.31: rear, near the collector pos. 32.

Bearing size 608Z.

And on the side of the impeller the bearing is pos.28, size 6000-2 RS.The Russian analogue 180100 .

The bearings are removed after the rotor has been removed from the gearbox housing. To remove the rotor from the gearbox, it is necessary to remove the pinion gear conical pos.26, which is located on the shaft of the rotor.

To do this, unscrew the nut M8 × 3.5 pos.25, remove the drive gear Z = 12.It is fixed with a key poz.30.Remove the bearings with a puller.

Dismounting the bearings from the bush anchor 230

To remove the bearings from the anchor position 27, it is necessary to pull the rotor out of the gear housing pos.19.Unscrew the nut M8 pos.20, remove the lock washer pos. 21, remove the drive gear pos.22.gently rocking, pull the rotor out of the gearbox housing. The bearing remains in the gear housing. It is closed with a bearing cover, pos.25, which is fixed to the gearbox body with three M5 × 8 screws pos.26.The bearing housing of size 6201-2RS is installed in the gear housing. The Russian analogue 180201 .

The bearing of pos. 28 is removed from the collector side with a puller. Bearing size 608RT.The Russian analogue 180608 .

Repair of stator Bulgarks Interskol

Repair of the stator of any Bulgarian Interskol is made after determining the nature of the malfunction. Most often the stator burns. This is due to overheating of the instrument. On the stator malfunction shows involuntary uncontrolled untwisting of the rotor of the Bulgarian.

To repair the stator, pull it out of the housing. The stator can be checked for operation and, without removing it from the housing. But this can be done only in specialized workshops. Or if you have a device to control short-circuited turns of IR-2.Then you can determine the open or short circuit in the stator windings without removing the stator. Burned stator is removed, rewound, or a new one is installed instead.

The burnt stator can be rewound by hand.

The rewind algorithm is as follows:

• Cut in any way a damaged winding from one edge;
• Count the number of turns of the winding, determine the direction of winding, the percentage of filling the groove of the stator core, measure the diameter of the wire;
• After removing the burned winding, clean the core grooves, check the insulation;
• Prepared wire winds into the prepared grooves the required number of turns of the stator windings;
• Solder the ends of the windings, pre-insulated with an insulating wire;
• Impregnate stator windings using alternating current;
• Clean the traces of impregnation inside and outside on the stator housing;
• Check the free movement of the rotor inside the stator.

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Video repair stator Bulgarks Interskol with their own hands

Mechanical faults Bulgarka Interskol

Of mechanical problems for Bulgarians Interskol weak point remains reducer. The gears used in the reducer wear out with time, the teeth are destroyed, and there is a backlash in the joints.

Repair of the gearbox of the grinding wheel Interskol Ushm 125

In order to repair the reducer of the Bulgarian Interskol, it is necessary to establish the nature of the malfunction. Most mechanical failures in the gearbox are determined visually, or by ear. A large runout of the spindle shaft, jamming or cranking of the gears of the gearbox is determined by simply inspecting the state of the spindle shaft. And increased noise during the operation of the reducer, uncharacteristic sounds, overheating can be determined by ear or by touching the body by hand.

To disassemble the gearbox, it is necessary to unscrew( 4) four M4 × 14 screws 11, remove the lock washers ДУ-1000ЭР pos.12, pull out the gearbox cover pos.13.In it remains the mounted spindle pos.10.The spindle is mounted in the bearing pos.14.Bearing size 6201-2RZ.Russian analogue 180201.

For pressing the spindle out of the bearing housing, it is necessary to use a press. But you can gently knock out and hammer. The main thing is not to damage the gearbox housing cover.

The tapered conical wheel pos.16 is held on the keyed connection and fixed by the locking ring pos.17.As a key in the Bulgarian Interskol USM 125/900 a ball with a diameter of 3 mm is used. If you remove the snap ring, then it is not too difficult to remove the gear. In other models of Bulgarians Interskol Ushm 125 a dowel is used.

Remove the gears and look at them for teeth licking, breaking or biting, the presence of backlash in the keyed connection.

Repair of the gearbox of the grinding wheel Interskol Ushm 230

To disassemble the reduction gearbox, remove the cover pos. 6 by unscrewing the four( 4) screws. The spindle pos.8 is held in the bearing pos. 9, pressed into the cover body pos.6.Bearing size 6203zz. The Russian analogue 180203.

The gear wheel pos.11 is pressed onto the spindle with interference. To remove it, you need a press. The craftsmen manage to remove with a hammer, preheating the gear.

Remove the gears and look at them for the teeth to be lapped and broken.

Repair of Bulgarian Interskol Ushm 230

Assembling Bulgarian Interskol

Assembling Bulgarian Interskol is no different from assembling Bulgarians of other brands. To the assembly allowed serviceable, freed from the old lubricant, parts and components. The assembly consists of several stages.

How to assemble a reducer for the Bulgarian Interskol

To assemble the reducer assembly, it is necessary to assemble the spindle by putting bearings and bevel gears on it.

On the spindle pos.10 is put on the cover of the gearbox body pos.13, bearing pos.14, the bearing caps pos. 15, the gear conical wheel pos.16.The gear is fixed to the spindle by a keyed connection. In Ushm 125 a 3 mm diameter ball is used as a key. To fix the spindle on the spindle, the pinion is fixed by the locking ring pos.17.The assembled spindle is inserted into the needle bearing pos.18.A needle bearing is pressed in the gearbox housing pos.21.

Assembling of the reduction gearbox ushm 230 begins with the assembly of the spindle assembly pos. 8, on which the bearing is posed, pos. 9, the lock ring pos. 10.The toothed wheel 11 is pressed onto the spindle. The spindle is inserted into the roller bearing pos.12.Bearing size НК1210.

To facilitate the pressing process of the driven gear 11 from the spindle pos.8, heat the gear and cool the spindle.

How to assemble the Bulgarian Interskol

The algorithm for assembling the Bulgarian Interskol is as follows:

• The stator is inserted into the body;
• The stator is covered with plastic protection;
• A rotor with a protected rubber bushing on the collector bearing is inserted into the stator;
• The second end of the rotor is inserted into the gear housing;
• The drive pinion is attached to the rotor and fixed with a nut with a right-hand thread;
• The gear housing is fixed to the stator housing with four screws;
• The rotor rotation is checked smoothly;
• The gearbox housing is fitted with a cover with a driven gear;
• Four( 4) screws fastening the gearbox cover;
• Check the smoothness of turning the tool spindle;
• Carbon brushes are installed;
• The back cover is put on or the handle is going to;
• A test run of the tool is made, the smooth operation is checked.

According to the above algorithm, all Bulgarians from the Interskol family are collected.

Several features when disassembling and assembling Bulgarian Interskol:

• For a good quality removal of the old grease from the gearbox housing, the latter should be warmed up with a professional hair dryer before the liquid lubrication state and then removed;
• In some models of the Bulgarian Interskol, the driving gear is fixed to the shaft with two nuts, one of which is lockable under the key S = 12;
• Carefully untwist or tighten the locking nut of the driven gear of the rotor in the Bulgars Interskol Ushm 115;
• Place a lubricant in the gearbox housing that is less than half its volume;
• When dismantling, carefully inspect the condition of the collector sipes, there should be no traces of burning and worked out tracks on it.

A few words about the greasing of the Bulgarian Interskol

Before assembling the mechanical parts of the Bulgarian Interskol, you must lubricate the parts with the recommended lubricant. Lubricants from foreign and Russian manufacturers are widely represented on the Russian market of lubricants. Today you can buy high-quality lubricants of the domestic manufacturer. They are in no way inferior in quality to foreign analogs, but are several times cheaper.

A special grease with high adhesion has been developed for the Bulgarian reducer gears. Adhesion is the property of the substance to adhere to the lubricated surface.

Conclusion:

• When choosing a Bulgarian, choose the Russian Angles grinder from Interskol;
• You will get a reliable, durable, ergonomic, cheap tool;
• Preference is given to Bulgarians Interskol Ushm class 125;
• In the household they are more in demand and safe.

Good luck to you!

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