Disassembly and repair of a coffee grinder with your own hands
Modern coffee grinders, no doubt, reliable and productive, however, designed for specific tasks. Example, the coffee grinder may need repair, if it grinds sugar instead of coffee beans. Other models, especially produced by Bork and Bosch, suffer from the penetration of moisture into the area of the motor shaft. But in any case, if the engine has not burned out, you can repair the device with your own hands.
disassembly technology
Most coffee grinders have a fairly transparent disassembly algorithm. There are two types of devices:
- knife coffee grinders;
- mill mills.
The latter have a separate algorithm for disassembling the grinding mechanism. Answer to the question, how to completely disassemble a coffee grinder, depends on the specific device model. The general scheme is the same. The conical blades of the mill are fastened to the drive shaft with three or four bolts. It is easy to unscrew them. However, when reassembling, you need to carefully monitor it, so that the heads are fully included in the seats. If you assemble a mill device, that did not sink bolts, you can burn a coffee grinder, or constantly find fine metal dust in the grind because of that, that the protruding mounting heads protrude into the area of movement of the ground mechanism.
The bodies of coffee grinders are easy to disassemble. You need to unscrew a couple of screws, which are often located on the lower plane, days of the car. Access to them can be as open, and protected legs of the device.
A separate group of coffee grinders is held on latches. Example, Bosch MKM models 6000, Soviet apparatus ZMM, ECMU grinders 50 and ECM 125. Here the lower part of the case is removed by means of thin probes or screw-drivers, which bend the latches.
To remove the motor to inspect the condition of the bearings and shaft, you need to dismantle the knives. They are shot in different ways. The most common type of connection is threaded. The principle of self-tightening is used. If the knife moves clockwise, then the left thread is cut on the connection. If in the opposite direction - right. To dismantle the knife, you need to place the slot of the screwdriver in the appropriate slot of the shaft, then turn the knife unit clockwise or counterclockwise, depending on the thread.
Care must be taken when dismantling the knife. The recess on the shaft is shallow, soft metal, so the screwdriver must be placed tightly, to press and at unscrewing of a knife to make efforts gradually.
Subsequently, the mounting area is clogged with remnants of grinding, captured by oxides. Therefore, it is recommended to use WD-40 oil, to remove dirt and easily unscrew the blade unit. If, when the clamping nut has a conical thread and is made of bronze, you can heat the connection area a little, using a soldering iron.
Further actions depend on the model of the coffee grinder. Disassemble the device carefully, tracking limiters, removing structural elements from the grooves. Most often, after removing the knife block, very little needs to be done:
- Unscrew the locking plastic nut, which fastens a glass of grinding. Felt Dust Gasket, fastened to the locking nut, it is impossible to lose at the same time.
- Remove the steel washer washer.
- Remove the blocker plate, carefully pushing it down and removing it from the limiting grooves of the body.
Disassembly of most models of coffee grinder (example, Saeco GROUP 700, Bosch MKM 6000) ends with the removal of dirt washers and dismantling of the power wire, switch. During detailed disassembly can be installed, what, example, the washer has burst or is finally unusable (salty, condensed) gasket.
It is easy to replace a destroyed element. To do this, you need to know the details of the coffee grinder, there are data on most common devices on the Internet. After that you can go to the market, to a specialty store or service center, having on hands precisely marked name and number of the necessary detail.
Saeco coffee grinder detailing example
Typical problems and ways to solve them
A multimeter and knowledge of the engine are required to repair the engine or determine its operability, where to measure the resistance of the windings. Therefore, we will touch only on relatively minor problems, which can be eliminated even with minimal tool skills.
Power cable breakage and blocking failure
The broken power cable is visible to the naked eye. But if the inflection point is close to the body, you can detect a breakdown, just by moving the wire. If the device began to show signs of life - then, will have to change the cable.
Failure to lock occurs due to clogging of the pressure mechanism (is on the line of the cover groove) or no pressure on the inner plate. Simply check the lock - press on the protruding plastic element with a thin screwdriver. If at a certain position the coffee grinder comes to life, it must be disassembled and contaminated.
The machine does not start
There can be several reasons: from cable breakage inside (to solve this problem you will need skills to work with a soldering iron) before engine failure. In this case, the test will require special knowledge. In this case, the repair is economically inefficient, need to rewind or buy a new engine, it is often easier and cheaper to buy a new coffee grinder.
The knife rotates unevenly, the speed decreases sharply with increasing mass of grinding
One of the reasons is partial engine failure, burnout of one of the windings. Repairs can be a problem. Diagnosis will be required, rewind or expensive replacement.
At work there is a smell of smoke, strained sound of the engine
The most common cause is contamination and oxidation of bearings or plain bushings. This problem is quite common in Bosch coffee grinders 6000. To eliminate contamination, the device must be carefully disassembled, check the ease of sliding of all blocks, lubricate the bearings. For Bosch models 6000 the following is done:
- from the shaft (the upper part) the replaceable sleeve is removed;
- the shaft is treated with alcohol;
- at obvious signs of corrosion it is removed by means of special means or WD 40.
The shaft can be peeled, you need to act carefully. Procedure, shown in the following video, does not belong to the category of frequently used. With diligence and constant repetition of maintenance of this kind, you can change the gap in the sliding sleeve, which will lead to errors of various kinds.
conclusion
Self-repair of the coffee grinder can be carried out periodically. Maintenance procedures include lubrication and cleaning of contaminants. To prevent emergencies, do not operate the coffee grinder in modes, which are not recommended by the manufacturer. Example, grind sugar into powder, chop the herbs, to process large masses of grinding. Each technique has its own rules of operation and if you do not violate them, the device will work long and smoothly.
