How to repair rotor Makita angle grinder
If the angle grinder overheats, a burning smell appears, and sparks increase in the collector area, it is necessary to pay attention to the integrity of the rotor pos.
Dismantling the rotor involves a sequential disassembly. To remove the rotor, it must be freed from the gearbox pos. 3. To do this, unscrew the M6 hex nut pos. 4. To unscrew the nut, clamp the rotor with one hand. With the other hand, using an open-end wrench, Unscrew the nut counterclockwise.
Remove the nut, pull out the flat washer, pos. 5, remove the bevel spiral gear, pos. 6, remove the retaining spring, pos. 7. Swing the rotor to the sides, carefully pull it out of the gearbox housing pos. 3. Having removed the retaining ring pos. 8, using a puller, pull off the bearing pos. 9.
The Makita 9565 Angle Grinder Applications Bearing 6001LLB.
It remains to remove the flat washer pos. 10 and the gear cover pos. 11.
Before you is the appearance of the rotor angle grinder Makita 9565 with an insulating washer put on, item 14, a flat washer 7 item 15, bearing item 16 and rubber boot 22 item 17. The manifold side of the angle grinder uses 627zz bearing. Russian analogue 80027.
Rotor repair consists in replacing it with a new or refurbished one. You can repair the rotor yourself, but you need not only patience, equipment, material. This is a kind of high class work.
How To Repair Gearbox Angle Grinder
The reducer consists of a housing, a leading and a driven gears. The pinion gear is fitted onto the rotor shaft. The driven gear is attached to the spindle pos. 50.
On an angle grinder Makita 9565 The driven gear is pressed onto the spindle. And in the model, the Makita 9558HN angle grinder The driven gear is attached to the shaft using a keyway.
Gearbox malfunctions are associated with the failure of the gear teeth. Gears are licked or some of the teeth are chipped.
Gearbox repair Makita angle grinder consists in replacing a pair of helical gears. Replacement of gears is made only in pairs.
To remove the driven gear, you cannot do without a press or a special puller. Do NOT use a hammer as the gear housing is made of fragile material.
Possible electrical faults
Electrical faults of Makita angle grinder can be divided into control circuit faults, rotor breakdowns and stator faults.
Checking the electric motor
In addition to control circuits, the electric circuit of the angle grinder includes a rotor and a stator. These are complex units, which are recommended to be repaired in specialized centers. But for Russian craftsmen nothing is inaccessible to comment. We recommend our own methods of repairing a stator or rotor with our own hands.
Repair manual for Makita angle grinder
The famous Japanese brand Makita enjoys well-deserved popularity among consumers around the world. All Makita products are distinguished by high quality, ergonomics, and affordable prices. A competent Russian consumer tries to squeeze out more from the tool than it can give. Makita angle grinder has its ultimate strength.
Do-it-yourself Makita angle grinder repair is not particularly difficult and can be done both at a service center and on your own, since you can freely purchase the necessary spare parts. Malfunctions of an angle grinder and how to fix them are discussed in detail in the attached instructions.
How to troubleshoot control circuits Makita angle grinder
If your Makita angle grinder won’t turn on, the greatest prerequisite may be a breakdown in the power and control circuits.
To get to the components of the control circuits, it is necessary to remove the back cover of the housing, pos. 38, by unscrewing the self-tapping screw 4 × 18 item 39. Switch ST115-40 K9565 pos.28 is attached to the holder of the switch pos.27. The holder of the switch is closed with a cover, pos. 29, which is attached to the motor housing, pos. 33.
The power cable pos. 37 is suitable for the switch. Using a tester, check the continuity of the circuits from the contact of the plug to the terminals of the switch. The switch, pos. 28, is controlled by the lever, pos. 30. Here are the contacts of the switch, check the circuit to the carbon brushes pos. 42.
In control circuits The weakest link is the carbon brushes. The Makita 9565 angle grinder uses CB-318 carbon brushes with Auto switch off, so check the brushes.
In professional angle grinders, speed regulators are installed. The Makita angle grinders with a power of more than 1000 W are provided with the installation of a soft start system. The Makita 9077SF angle grinder is equipped with such a system.
If the switch fails, the malfunction is eliminated by its complete replacement. In the event of a break or breakdown of the power supply wire, the malfunction is eliminated by replacing the whole wire or removing damaged parts of it.
The switching process is carried out using the lever pos.30. If you disassembled the angle grinder body for repair or maintenance, lubricate the lever movement grooves with silicone grease before reassembly.
How to repair the stator Makita angle grinder
The failure of the stator, pos. 24, is indicated by the appearance of a burning smell, overheating of the case of the angle grinder, Spontaneous set of revolutions of the angle grinder. In the case of the angle grinder pos. 33, the stator is fastened with four self-tapping screws 4 × 70 item 21. To prevent damage, the stator is covered with a protection pos. 20.
Repair of the stator of the Makita angle grinder consists in determining the short circuit or breakage of the windings. It is best to diagnose the stator with a special device called IK-2. The stator is considered defective if traces of darkening of the winding are visible, an open or short circuit of the winding turns is detected.
The stator is easy to repair. Gotta rewind his winding.
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Step 1. Dismantling the housing of the angle grinder.
Partially disassembled housing angle grinder
For this operation we need a screwdriver. Personally, I use a multi-function ratchet screwdriver.
Step-2. Dismantling the protective cover
Dismantling the protective cover with a screwdriver angle grinder
To disassemble the protective cover of the angle grinder, it is necessary to Unscrew the fastening bolts. For this model, four bolts. Can be unscrewed with a screwdriver. For second models, you may need a wrench.
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Step-3. Removing the gearbox from the housing angle grinder.
Reducer and housing of angle grinder
The gearbox in the angle grinder housing (for this model) is held by four bolts. Unscrew these bolts with a screwdriver, then with extreme caution.Pulling the angle grinder out of the gearbox housing.
Photo-3/1. Rotor appearance angle grinder
The rotor is fixed rigidly with
The gearbox and the rotor of the electric motor are rigidly fixed to each other. To remove the rotor from the gearbox, you must first disassemble the gearbox. Therefore, our next step will be to disassemble the gearbox itself.
Step-4. Disassembly of the gearbox angle grinder
Disassembly with a screwdriver gearbox angle grinder
The angle grinder gearbox is disassembled Not only for the repair of failed parts, but also for preventive maintenance.
Angle grinder gearbox is the most important unit and undergoes certain loads.
The gearbox consists of:
1. Gearbox housings.
2. Big gear.
3. Driven gear (armature shaft gear).
4. Bearings that need lubrication to reduce the frictional forces that occur during operation.
Step-5. Disassembled gearbox appearance
Gearbox parts. inside view.
To remove the rotor from the gearbox, the angle grinder should unscrew the nut holding the rotor in the gearbox and, using Special pullers, pull the rotor rod out of the gearbox.
This operation presents some difficulty and therefore I strongly recommend that you carry it out in a repair shop. For self-disassembly, you need a special tool and knowledge. To carry out preventive work to remove dust and dirt, such a detailed disassembly is not needed. Such disassembly is carried out only if one of the parts fails, such as a rotor or bearing.
The process of removing the rotor and bearing from the gear housing
Using a locksmith vise when disassembling the gearbox angle grinder
If you nevertheless decided to completely disassemble the gearbox, then for the success of the venture you will need a locksmith’s vice and do the following:
1.From the side of the gearbox with a key (see photo).
2. Carefully clamp the rotor housing in a vise and knock out the gear housing with a wooden stick or light hammer blows.
3. Change the position of the rotor in the vice and knock out the bearing from the wooden board.
4. Unscrew the gear from the rotor shaft.
Gear design and
The gear has a right-hand thread
To remove the gear from the gearbox shaft:
1. Fix the rotor in a vice (previously wrapped it with a rag).
2. Then wrap the gear with rags, tighten with a gas wrench and return counterclockwise.
Removing the spindle and large gear from the body
Parts that make up the assembly of the structure
The large gear housing consists of:
1. Rotating spindle.
2. Spindle body
4. Rubber seal.
To disassemble the spindle housing, start by pulling out the large gear with a special puller. After that, they clamp the body in a vice and knock out the spindle with the bearing carefully (with light blows through the board) from the body. Next, using Special pullers or by the method described above, knock out the bearing.
It is very important to timely disassemble the gearbox and replace the lubricant (usually lithol-24 lubricant) after an intensive period of operation. Timely grease change can significantly extend the life of the angle grinder gearbox by preventing premature wear of its component parts.
When disassembling the angle grinder, especially when disassembling the gearbox, it is very important to remember the position of all parts in the housing. This is necessary for correct reassembly of the tool, as there is often a situation where disassembly becomes much easier than reassembly. In order to better learn a lesson on how to disassemble an angle grinder, I have prepared a small especially for you.
How to troubleshoot control circuits Makita angle grinder
If your Makita angle grinder won’t turn on, the greatest prerequisite may be a breakdown in the power and control circuits.
Gratitude would be helpful. How to repair rotor Makita angle grinder
If the angle grinder overheats, a burning smell appears, and sparks increase in the collector area, it is necessary to pay attention to the integrity of the rotor pos.
Diagram angle grinder Makita
Dismantling the rotor involves a sequential disassembly. To remove the rotor, it must be freed from the gearbox pos. 3. To do this, unscrew the M6 hex nut pos. 4. To unscrew the nut, clamp the rotor with one hand. With the other hand, using an open-end wrench, Unscrew the nut counterclockwise.
Remove the nut, pull out the flat washer, pos. 5, remove the bevel spiral gear, pos. 6, remove the retaining spring, pos. 7. Swing the rotor to the sides, carefully pull it out of the gearbox housing pos. 3. Having removed the retaining ring pos. 8, using a puller, pull off the bearing pos. 9.
The Makita 9565 Angle Grinder Applications Bearing 6001LLB.
It remains to remove the flat washer pos. 10 and the gear cover pos. 11.
Before you is the appearance of the rotor angle grinder Makita 9565 with an insulating washer put on, item 14, a flat washer 7 item 15, bearing item 16 and rubber boot 22 item 17. The manifold side of the angle grinder uses 627zz bearing. Russian analogue 80027.
Rotor repair consists in replacing it with a new or refurbished one. You can repair the rotor yourself, but you need not only patience, equipment, material. This is a kind of high class work.