Zenit Powertools AG-115/850 User manual

InstructIon manual
anGlE GrInDEr
aG-115/850

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General safety precautions
WARNING! When using electric tools, basic safety precautions should always
be followed to reduce the risk of re, electric shock and personal injury, including the
following.
Read all these instructions before operating this product and save these instructions.
For safe operations:
1. Keep work area clean. Cluttered areas and benches invite injuries.
2. Consider work area environment. Do not expose power tools to rain. Do not use
power tools in damp or wet locations. Keep work area well lit. Do not use power tools
where there is risk to cause re or explosion.
3. Guard against electric shock. Avoid body contact with earthed or grounded surfaces.
(e.g. pipes, radiators, ranges, refrigerators).
4. Keep children and inrm persons away. Do not let visitors touch the tool or extension
cord. All visitors should be kept away from work area.
5. Store idle tools. When not in use, tools should be stored in a dry, high or locked up
place, out of reach of children and inrm persons.
6. Do not force the tool. It will do the job better and safer at the rate for which it was
intended.
7. Use the right tool. Do not force small tools or attachments to do the job of a heavy
duty tool. Do not use tools for purposes not intended.
8. Dress properly. Do not wear loose clothing or jewelry; they can be caught in moving
parts. Rubber gloves and non-skid footwear are recommended when working outdoors.
Wear protecting hair covering to contain long hair.
9. Use eye protection. Also use face or dust mask if the cutting operation is dusty.
10. Connect dust extraction equipment. If devices are provided for the connection of
dust extraction and collection facilities ensure these are connected and properly used.
11. Do not abuse the cord. Never carry the tool by the cord or yank it to disconnect it
from the receptacle. Keep the cord away from heat, oil and sharp edges.
12. Secure work. Use clamps or a vise to hold the work. It is safer than using your hand
and it frees both hands to operate tool.
13. Do not overreach. Keep proper footing and balance at all times.
14. Maintain tools with care. Keep cutting tools sharp and clean for better and safer
performance. Follow instructions for lubrication and changing accessories. Inspect tool
cords periodically and if damaged, have it repaired by authorized service center. Inspect
extension cords periodically and replace, if damaged. Keep handles dry, clean, and free
from oil and grease.
15. Disconnect tools. When not in use, before servicing, and when changing accessories
such as blades, bits and cutters.
16. Remove adjusting keys and wrenches. Form the habit of checking to see that keys
and adjusting wrenches are removed from the tool before turning it on.

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17. Avoid unintentional starting. Do not carry a plugged in tool with a nger on the
switch. Ensure switch is off when plugging in.
18. Use outdoor extension leads. When tool is used outdoors, use only extension cords
intended for outdoor use.
19. Stay alert. Watch what you are doing. Use common sense. Do not operate tool when
you are tired.
20. Check damaged parts. Before further use of the tool, a guard or other part that is
damaged should be carefully checked to determine that it will operate properly and
perform its intended function. Check for alignment of moving parts, free running of
moving parts, breakage of parts, mounting and any other conditions that may affect its
operation. A guard or other part that is damaged should be properly repaired or replaced
by an authorized service center unless otherwise indicated in this instruction manual.
Have defective switches replaced by an authorized service center. Do not use the tool if
the switch does not turn it on and off.
21. Warning Use only accessories or attachments recommended in this instruction man-
ual or in the catalogue of ZENIT ТМ.
22. Have your tool repaired by a qualied person. This electric tool is in accordance
with the relevant safety requirements. Repairs should only be carried out by qualied
persons using original ZENIT TM spare parts. Otherwise this may result in considerable
danger to the user.
safety precautions on usinG anGle Grinder
1. Always use proper guard with grinding wheel.
2. Accessories must be rated for at least the speed recommended on the tool warning
label. Use only depressed center grinding wheels rated for speed 80 m/s or more.
3. Make sure the size of the grinding wheel is compatible with size of the angle grinder
and that grinding wheel matches the spindle.
4. Store and keep grinding wheels according to the manufacturer’s instructions.
5. Before using a grinder or installing a new wheel, inspect the grinding wheel for chips
and cracks. Remove bad wheels immediately.
6. Hold the tool with both hands while starting the tool, since torque from the motor can
cause the tool to twist.
7. Never use cut-off wheel for side grinding.
8. Do not use any adapter sleeves to install grinding wheels with holes of bigger diam-
eter.
9. Don’t put tool until it comes to a complete stop.

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description
1. Spindle lock button;
2. Reducer case;
3. Grinding wheel;
4. Protective cover;
5. Additional handle;
6. «On\Off» switch;
7. Engine case.
technical specifications
Model AG-115/850
Rated power 850 W
Rated voltage 220-240 V
Rated frequency 50-60 Hz
Disc diameter 115 mm
No-load speed 11000 rpm
standard accessories
Wrench 1
Side handle 1
Depressed center grinding wheels are not included in standard accessories. Standard
accessories list is subject to change without prior notice.
applications
- Removal of casting n and nishing of various type of steel, bronze and aluminum

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materials and castings.
- Grinding of welded sections or sections cut by means of an acetylene torch.
- Grinding of synthetic resin, slate, brick, marble etc.
- Cutting synthetic concrete, stone, brick, marble and analogous materials.
prior to operation
1. Power source.
Ensure that the power source to be utilized conforms to the power source requirements
specied on the product nameplate.
2. Power switch.
Ensure that the power switch is in the OFF position. If the plug is connected to a recep-
tacle while the switch is in the ON position, the power tool will start operating immedi-
ately and can cause serious injury.
3. Extension cord.
When the work area is far away from the power source, use an extension cord of suf-
cient thickness and rated capacity. The extension cord should be kept as short as prac-
ticable.
4.Mounting the wheel guard.
Be sure to mount the wheel guard at an angle that will protect the operator’s body from
injury by a broken wheel piece.
Installing wheel guard:
- Loosen the screw on the wheel guard.
- Install the wheel guard to the packing gland, turn it to the angle suitable for operation
and make adjustment.
- After the adjustment, ensure that the screw is securely tightened on the wheel guard in
order to x it completely.
5. Thoroughly check that the depressed center wheel is free of cracks, splits and other
abnormalities before mounting. Make sure it is rmly clamped and has been properly
mounted. Refer to section “Depressed center wheel assembly and disassembly”.
6. Test the grinder before using.
Before actually beginning the grinding work, test the grinder and make sure all acces-
sories are installed correctly.
Duration of the trial run is 30 seconds. Immediately turn it off in case of abnormal vibra-
tion or other malfunctions. If any malfunction appears, inspect the grinder carefully to
determine malfunction cause.
7. Check spindle lock. Make sure that the push button is disengaged by pushing lock
button two or three times before turning on the grinder.
8. Side handle installation.
Screw the side handle in into the gear cover.

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Grinder operation
1. Grinding pressure
There is no need to press hard when grinding. Usually the grinder’s own weight is suf-
cient to allow the required light contact with surface to be ground. Heavy pressure can
result in wheel breakage. It can also damage the surface being ground or damage the
grinder’s motor.
2. Use proper grinding angle
Grind only with the wheel’s edge by lifting the grinder 15°-30°. Do not use the en-
tire surface of the depressed center wheel. Use only the edge of the depressed center
wheel.
3.Move the grinder in proper direction
When using a new depressed center wheel, grind transverse to the surface being ground.
Once the wheel edge is worn, the workpiece can be ground in any direction.
4.After operation.
Do not put tool until it comes to a complete stop.
CAUTION
Check and make sure the workpiece is rmly clamped.
Make sure air vents are clean when working in areas of dust. Clean the tool carefully
with nonmetallic objects.
Never use the grinder in places where the sparks generated by the grinder can ignite the
dust of fumes.
Use safety equipment. Always wear eye and ear protection.
If necessary wear other safety equipment such as dust mask, gloves, helmet or apron.
If uncertain wear safety equipment.
If idle disconnect from the power source.
Depressed center wheel assembly and disassembly
Never attempt to assemble or disassemble the depressed center wheel, unless the power
switch is in the “OFF” position and the electric cord has been disconnected from the
receptacle.
Assembly:
- Turn the disc grinder upside down so that the spindle is facing upward.
- Align the oval-shaped indentation of the wheel washer with the notched part of the
spindle, then attach them.
- Fit the protuberance of the depressed center wheel onto the wheel washer.
- Screw the wheel nut onto the spindle.
- While pushing the push button with one hand, lock the spindle by turning the de-
pressed center wheel slowly with the other hand. Tighten the wheel nut by using the
supplied wrench.
Disassembly
To remove the depressed center wheel, simply reverse the above-mentioned proce-
dure.

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CAUTION
Tighten the wheel nut securely and conrm that the depressed center wheel does not
wobble.
Make sure that the push button is disengaged by pushing lock button two or three times
before turning on the grinder.
Maintenance and inspection
1. Inspecting the depressed center wheel.
Conrm that there is no crack or any damage to the depressed center wheel.
2. Inspecting the screws
Regularly inspect all screws and ensure that they are fully tightened. Should any of the
screws be loosened, retighten them immediately.
3. Inspecting of carbon brushes
The motor employs carbon brushes which are consumable parts. Replace the carbon
brush with a new one when it becomes worn to its wear limit. Always keep carbon
brushes clean and ensure that they slide freely within the brush.
4. Replacing carbon brushes
Removal
Loose the screw retaining the brush cap.
Use auxiliary wrench or a small screwdriver to pull back the brush spring. Move the
spring edge from the brush holder.
Remove the brush pigtail from the brush holder terminal and remove the brush from the
brush holder.
Installing
- Install the brush pigtail in the brush holder terminal.
- Install the brush into the brush holder.
- Use auxiliary wrench or a small screwdriver to put the spring edge on the top of the
carbon brush,
- Install the cap and tighten the screw D4.
5. Maintenance of the motor
The motor unit winding is the very “heart” of the power tool. Exercise due care to un-
sure the winding does not become damaged and/or wet with oil or water.
CAUTION
When using the screwdriver follow these rules:
• continuous use of the power tool should not exceed 15 minutes;
• do not allow mechanical damage (strikes, falls etc.);
• protect the power tool from external sources of heat and chemically active substances,
as well as liquid and objects penetration;
• before disconnecting the tool from the power source turn off the On/Off switch;

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• check the engine temperature, do not allow overheating;
• change the rotation direction only after switching off the tool and complete stop of
rotating parts.
Inobservance of these rules will make warranty void!
WARNING! Repair, modication and check of ZENIT power tools should be
performed only in authorized service centers ZENIT. While use or maintenance of pow-
er tools follow all safety rules and standards.
NOTE
Zenit Power Tools are constantly being improved and modied to incorporate the latest
technological advancements.
Accordingly, some parts may be changed without prior notice.

Demix LLC
Head ofce:
14, Shevchenko str., 3rd oor
Dnepropetrovsk, Ukraine, 49044
tel./fax: [phone]
http://www.en.zenit-pro.com