Detailed photo report on replacing the bearing of the input shaft of the gearbox of an 800W belt grinder.
While the grinder was operating, without any extraneous sounds, the engine speed increased sharply and the belt stopped.
To determine the malfunction, it is necessary to unscrew the three screws of the drive belt cover.
After dismantling the cover, the following picture was revealed:
The drive belt melted instantly due to a malfunction of the grinder gearbox. The primary shaft of the gearbox (with a large pulley) rotated easily by hand, but sometimes braked sharply.
To disassemble the grinder gearbox, you need to unscrew the screw in the center of the large pulley. Hold the pulley with pliers.
Attention! The screw has a left-hand thread!
After unscrewing the screw, unscrew the pulley, holding the shaft by the dust extraction fan. The pulley has a regular right-hand thread.
Remove the aluminum fan cover, fan impeller, and the bottom of the plastic fan housing.
The fan housing can be removed with some interference, since it is also the top cover of the grinder gearbox. It contains seat upper bearing of the gearbox input shaft. The upper bearing of the input shaft appeared to be without damage or play. To access the lower bearing, it is necessary to remove the gearbox secondary shaft gear. To do this, remove the retaining ring and gear.
After these operations, remove the input shaft from the lower bearing. In my case, only fragments of the separator remained in the lower bearing; the balls were bunched up in one direction. All that remains of the bearing.
Since the grinder is already more than five years old, it was decided to check and lubricate all the bearings.
To do this, it is necessary to disassemble the tape drive platform. It is necessary to remove the gear fixing pin from the secondary shaft.
Unscrew the three platform mounting screws and the belt position adjustment screw (located on the other side).
Using a wide screwdriver, move the platform along the housing guides. Remove the retaining ring and remove the belt driven roller shaft. The drive roller of the tape is removed from the platform body with some force along with the bearing. Use a sharpened awl to remove the protective caps on the bearings. Bearings are checked for play and smooth rotation and filled with lubricant. I lubricated all the bearings with Litol-24.
Assembly is performed in reverse order.
Do not forget, before the platform is completely installed in place, to insert the spring of the belt position adjustment screw!
The outer race of the failed bearing was dismantled using narrow-nose pliers with curved ends.
A new bearing was installed in place of the removed race.
After installing the belt drive platform, the gear fixing pin and the gear of the secondary shaft of the gearbox itself were inserted into the secondary shaft of the gearbox. The gear is secured with a locking ring.
After which the gearbox input shaft was installed and lubricant was added.
After these operations, all that remains is to close the gearbox and assemble the dust extraction fan.
With modern finishing works Various construction tools are used. Grinding machines are no exception.
Any tool can become damaged due to frequent use. And in order to repair a grinder with your own hands, you need to have an idea of its components and possible reasons breakdowns. Since the angle grinder is the most popular, subsequent repairs will be considered using its example.
In terms of design and external characteristics, such a machine is an angle grinder, as it consists of the same parts.
The grinder consists of:
- protective casing;
- ventilation hole;
- push-button switch;
- side handle;
- spindle lock.
Repairing a grinder should be done carefully and slowly, since the consequences of repairing power and electronic units can turn a minor breakdown into the unusability of the device.
You won't need many tools to repair a sander:
- soldering iron;
- tester;
- screwdriver.
Components of the device mechanism
A bearing caked with grease is a common cause of grinder breakdowns.
The machine has internal components and mechanisms, the structure of which also needs to be understood;
- Anchor. This is one of internal elements electric motor that makes rotational movements during operation of a device whose speed is controlled. The power parameters of the tool determine the rotation speed of the armature; the higher it is, the more powerful the device. During normal operation, the armature should rotate easily and freely, nothing should interfere with its rotation;
- Collector. This element has the appearance of a separate armature platform and the power and control windings are output to it. The collector performs the function of sending signals to the engine and control unit. To see it, you need to remove the case; it looks like polished contact plates with significant dimensions;
- Electric brushes. Plays the role of a conductor for conducting current from the power cable to the collector. If this element functions normally, then weak and uniform sparks will occur; they can be observed through the ventilation holes in the device body;
- Gearbox. It is a mechanical device located in the front of the machine. Its purpose is to transmit the mechanical energy of a rotating armature to a rotating disk. In this case, both the revolutions of the rotating disk and their speed development are subject to adjustment;
- Stator. This is the element of the electric motor in which the armature moves. It is the most complex element, since the windings in it must be pressed in with strict precision. It is not recommended to rewind the stator yourself; it is better to entrust this work to a specialist.
When making repairs, it is recommended to rely on the layout and electrical circuits, have on hand the instructions that came with this particular model of grinder. But many models do not come with such instructions; in this case, it is wiser not to carry out repairs yourself, but to seek help from a service center.
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When repairing any equipment, consistency must be observed. Simple faults are:
- The device suddenly stopped working.
The first thing to check is the electric brushes, since there is a possibility that they are not receiving current from the power supply.
To replace the bearing, the horseshoe retainer must be removed.
Specifically, the problem may lie in the power plug or in the wire itself, and the “Start” button may not work. To fix the problem, the housing is disassembled and the wiring is tested using a break tester. In frequent cases, the problem is in the wiring, and after replacing it, the grinder will start working again;
- After checking, the wires and plug are intact, and the device does not show any working signs. In this case, the starting unit is disassembled, and the elements being removed are marked, since if they are connected incorrectly during assembly, this may lead to the winding burning out or the armature may jam. The button is replaced with a similar model;
- Start button and power cable work, but the machine refuses to work. In this case, it is recommended to examine the brush holder. Most often, the problem is the contact plates of the collector, which, after cleaning, will begin to produce a spark and a smooth hum. If these signs do not appear, then the brushes must be replaced, since their service life is limited. If many models are produced with solder connections for brushes, then in this case it is necessary to desolder and replace them as a set, since partial replacement not produced;
- After changing electric brushes, they should be carefully inspected if the wear is uneven - this is a sign of a shift in the center of gravity or internal moving parts. If such a problem occurs, it is recommended to contact a specialized service department, since it is impossible to adjust the balance with your own hands.
Repairing brushes is a minor repair when troubleshooting, but more serious damage is best left to specialists.
Privacy Policy
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9.3..
This is an additional condition to make you feel more comfortable when contacting us. If something doesn’t suit you during or after the repair, just call our dispatch center 24/7 and I will return all your money to the last penny! By the way, in 2018 we received only 9 requests for a refund (out of 38,990 requests!).
🔧 After the warranty you will receive LIFETIME SERVICE
There is no need to worry about what will happen to your equipment after the warranty. I give every client a lifetime service maintenance in Lenremont. This means that if this equipment breaks down again after the warranty period, repairs will cost 2 times less! So you get 25% discount on post-warranty repairs.
✅ 2 years warranty on repairs
Yes! I am so confident in the skill of my masters that I boldly give you 2 years warranty for repairs. This is the biggest guarantee in all of Russia.
And one more surprise - you will receive 4 months warranty on all spare parts, since Lenremont orders parts from a direct supplier.
This guarantee means that, if suddenly Your equipment will break again, a technician will come and repair it for free her. Even if the technician who repaired your equipment gets sick or no longer works for us, you do not need to worry that you will be left without warranty repairs: we have more than 100 technicians for each type of equipment on our staff. We take full responsibility for ensuring that you, our dear client, are satisfied.
