Atlas Copco G2427 S250 Instruction sheet

G2427 S250
Printed Matter No.9836 9908 00 Die grinder
Publication Date 2019-05-08
Valid from Serial No. A5700001
Valid to Serial No. A1529999 Product Instructions
G2417 S250 ( 25000 r/min) 8423031286
WARNING
Read all safety warnings and instructions
Failure to follow the safety warnings and instructions may result in
electric shock, fire and/or serious injury.
Save all warnings and instructions for future reference

2© Atlas Copco Industrial Technique AB - 9836 9908 00
Table of Contents
EN Product Instructions ................................................................................................ 3

G2427 S250 EN Safety and operating instructions
© Atlas Copco Industrial Technique AB - 9836 9908 00 3
Safety and operating instructions
General information
Design and function
This die grinder is intended for mounted wheels and rotary burrs only. This model is lubricated. The ma-
chine, its attachments and accessories must only be used for the purpose for which they were designated,
all other use is prohibited.
■Never use grinding wheels attached with an adapter as this machine is not fitted with a wheel guard
■Never attach circular saw blades or other cutters than the abrasive wheels or brushes specified for
the tool
Signs and stickers
The product is fitted with signs and stickers containing important information about personal safety and
product maintenance. The signs and stickers shall always be easy to read. New signs and stickers can be
ordered by using the spare parts list.
Installation
Installation of vibrating tools
It is recommended that a minimum length of 300 mm of flexible hose for compressed air is inserted be-
tween a vibrating tool and the quick-action coupling.
Air quality
■For optimum performance and maximum product life we recommend the use of compressed air with
a dew point between +2°C and +10°C. Installation of an Atlas Copco refrigeration-type air dryer is
recommended.
■Use a separate air filter of type Atlas Copco FIL, removes solid particles larger than 15 microns and
more than 90 % of liquid water, installed as close as possible to the product and prior to any other air
preparation unit like REG or DIM (please see Air Line Accessories in our main catalogue). Blow out
the hose before connecting.
Lubricated models:
■The compressed air must contain a small quantity of oil. We strongly recommend that you install an
Atlas Copco oil-fog lubricator DIM, to be set normally at 3–4 drops (50mm3)/min for long cycle run-
ning tools, or an Atlas Copco single-point lubricator type Dosol for short cycle running tools.
For Dosol setting please see Air Line Accessories in our main catalogue.
Compressed air connection
WARNING Air under pressure can cause serious injury
►Always shut off air supply, drain hose of air pressure and disconnect tool from air supply when not
in use, before making any adjustments to the product, e.g. changing accessories, or when making
repairs.
►Never direct air at yourself or anyone else.
WARNING Whipping hoses can cause serious injury
►Always check for damaged or loose hoses and fittings.

Safety and operating instructions EN G2427 S250
4© Atlas Copco Industrial Technique AB - 9836 9908 00
Check air pressure:
■The product is designed for a working pressure (e) of 6-6,3 bar = 600-630 kPa = 87-90 psig.
■The air pressure at the tool inlet with the product running must not exceed the maximum operating
pressure 6.3.
■Blow out the hose before connecting it.
Operation
See also Service instructions
Preparations before using the die grinder
Correct function of die grinder
WARNING Overspeed can result in serious injury or death
►The maximum permissible speed as marked on the machine must not be exceeded
Testing of the die grinder should only be carried out by professional technicians. The technicians must be
authorized to test this type of tool and to operate a pneumatic system in accordance with national direc-
tives.
■The free speed of the machine shall be checked every day and whenever the machine has been ser-
viced. This check should be carried out with the grinding equipment detached
■Use a pressure regulator to avoid excessive air pressure which may cause overspeed
■Connections and air hose must be in good condition
Mounted wheel and carbide burr
WARNING Air under pressure can cause serious injury
►Always shut off air supply, drain hose of air pressure and disconnect tool from air supply when not
in use, before making any adjustments to the machine, e.g. changing accessories, or when mak-
ing repairs
WARNING Wrong insert tool can burst and cause serious injury or death
►Use insert tool with max operating speed higher or equal to the airgrinder speed
►Do not use other insert tool than specified by the manufacturer (no cutting off wheels or router
bits).
■Use only recommended sizes and types of abrasives
■Do not use mounting wheels that are chipped or cracked, or may have been dropped
■Correct mounting is necessary to prevent injury from broken mounted wheels
■Ensure the shaft diameter of the accessory is correct for the size of collet
■Do not mix mm shanks with inch collets and vice versa
■Observe a min of 10 mm axial grip of the shank
■When fitting mounted wheels or burrs, reduce the overhang by pushing the shank all the way into the
collet (Check also the recommendations given by the tool manufacturer)
■Observe that increased overhang of shank reduces permissible speed
■Before starting the machine, check that the collet is properly tightened
■Test run every new mounted wheel in a safe position for 30 seconds. Be sure to use a barrier (such
as under a heavy work table) to stop any possible broken wheel parts. Stop immediately if vibration is
excessive

G2427 S250 EN Safety and operating instructions
© Atlas Copco Industrial Technique AB - 9836 9908 00 5
Correct working with the die grinder
Read the Section Safety instructions before using the die grinder.
WARNING Failure to follow correct working practices can result in serious injury or death
►Ensure that the workpiece is properly supported
►Ensure that sparks do not cause a hazard to people or materials
►There is a risk of electrostatic discharge if the tool is used on plastic and other non-conductive
materials
►Personal protective equipment must be used as described in Section Personal protective equip-
ment
►Slip/Trip/Fall is a major cause of serious injury or death. Watch out for excess hose left on the
walking or work surface
►Proceed with care in unfamiliar surroundings. Hidden hazards may exist, such as electric or other
utility lines
►Maintain a balanced body position and firm footing
►React quickly to excessive vibration due to damaged, or improperly mounted insert tool
►Keep away from rotating drive spindle and abrasives. Rotation may continue for several seconds
after the throttle has been released. Do not lay the tool down until rotation has stopped
►Observe that stored compressed air in the hose may cause an accidental start
►Release control device if the energy supply should fail
Maintenance
Rust protection and internal cleaning
Water in the compressed air, dust and wear particles cause rust and sticking of vanes, valves etc.
This can be solved by lubricating with oil (a few drops), running the machine for 5-10 seconds and wiping
off excess oil with a cloth. Do this before longer standstills.
Lubrication
The front motor ball bearing should be lubricated with grease in conjuction with the regular overhaul of the
machine.
For flexible spindle extension – When fitting the extended spindle – apply 0.5 cm3 of grease type “Lubri-
cating Engineers LE3752” (or EP grease) at the bottom of the hole in the collet holder.
Lubricating guide
Use lubricants of good quality. The oils and greases listed in the lubrication table are examples of lubri-
cants that can be recommended.

Safety and operating instructions EN G2427 S250
6© Atlas Copco Industrial Technique AB - 9836 9908 00
Brand
General purpose
Bearings Air lubrication
BP Energrease LS-EP2 Energol E46
Castrol Spheerol EP L2
Esso Beacon EP2 Arox EP46
Q8 Rembrandt EP2 Chopin 46
Mobil Mobilegrease XHP 222 Almo oil 525
Shell Alvania EP2 Tonna R32
Texaco Multifak EP2 Aries 32
Molycote BR2 Plus
Overhaul
WARNING Overspeed could result in serious injury or death
►If governor is used, check that correct governor is assembled. Careless handling may put it out of
order
►Do not disassemble security parts, e.g. speed governor or overspeed shut-off. These parts must
be completely replaced when damaged
►Always check the free speed of the machine after service. See Section Preparation before using
the die grinder
The entire machine should be checked regularly at six-month intervals. If it is in heavy duty service or not
running properly it should be taken out of service more often for inspection.
The strainer at the air inlet should be cleaned frequently to prevent clogging and decreased capacity.
Useful information
Log in to Atlas Copco www.atlascopco.com
You can find information concerning our products, accessories, spare parts and published matters on our
website.
Ergonomic guidelines
Consider your workstation as you read through this list of general ergonomic guidelines and see if you can
identify areas for improvement in posture, component placement, or work environment.
■Take frequent breaks and change work positions frequently.
■Adapt the workstation area to your needs and the work task.
■Adjust for convenient reach range by determining where parts or tools should be located to avoid
static load.
■Use workstation equipment such as tables and chairs appropriate for the work task.
■Avoid work positions above shoulder level or with static holding during assembly operations.
■When working above shoulder level, reduce the load on the static muscles by reducing the weight
of the tool, using for example torque arms, hose reels or weight balancers. You can also reduce
the load on the static muscles by holding the tool close to the body.
■Make sure to take frequent breaks.
■Avoid extreme arm or wrist postures, particularly for operations requiring a degree of force.
■Adjust for convenient field of vision by minimizing movement of the eyes and head during the work
task.
■Use the appropriate lighting for the work task.

G2427 S250 EN Safety and operating instructions
© Atlas Copco Industrial Technique AB - 9836 9908 00 7
■Select the appropriate tool for the work task.
■Use ear protection equipment in noisy environments.
■Use high-quality inserted tools or consumables to minimize exposure to excessive levels of vibration.
■Minimize exposure to reaction forces.
■When cutting:
A cut-off wheel can get stuck if the wheel is either bent or if it is not guided properly. Make sure to
use the correct flanges for cut-off wheels and avoid bending the wheel during cut-off operation.
■When drilling:
The drill might stall when the drill bit breaks through. Makes sure you use support handles if the
stall torque is too high. The safety standard ISO11148 part 3 recommends using something to ab-
sorb the reaction torque above 10 Nm for pistol grip tools and 4 Nm for straight tools.
■When using direct-driven screw or nutrunners:
Reaction forces depend on tool setting and joint characteristics. The ability to bear reaction forces
depends on the operator’s strength and posture. Adapt the torque setting to the operator's strength
and posture and use a torque arm or reaction bar if the torque is too high.
■Use dust extraction system or mouth protection mask in dusty environments.
Country of origin
Please refer to the information on the product label.
Spare parts
Parts without ordering number are not delivered separately for technical reasons.
The use of other than genuine Atlas Copco replacement parts may result in decreased tool performance
and increased maintenance and may, at the company option, invalidate all warranties.
Warranty
Contact the Atlas Copco sales representative within your area to claim a product. Warranty will only be ap-
proved if the product has been installed, operated and overhauled according to the Operating Instructions.
Please also see the delivery conditions applied by the local Atlas Copco company.
ServAid
ServAid is a utility for providing updated product information concerning:
- Safety instructions
- Installation, Operation and Service instructions
- Exploded views
ServAid facilitates the ordering process of spare parts, service tools and accessories for the product of
your choice. It is continuously updated with information of new and redesigned products.
You can use ServAid to present content in a specific language, provided that translations are available,
and to display information about obsolete products. ServAid offers an advanced search functionality of our
entire product range.
ServAid is available on DVD and on the web:
http://servaidweb.atlascopco.com
For further information contact your Atlas Copco sales representative or e-mail us at:
[email protected]

Safety and operating instructions EN G2427 S250
8© Atlas Copco Industrial Technique AB - 9836 9908 00
Safety Data Sheets MSDS/SDS
The safety data sheets describes chemical products sold by Atlas Copco.
For more information, consult the website
http://www.atlascopco.com/.
Choose Products - Safety Data Sheets, and follow the instructions on the page.

G2427 S250 EN Service instructions
© Atlas Copco Industrial Technique AB - 9836 9908 00 9
Service instructions
Service instructions
Operating instructions
Free speed
Model Min r/min Max r/min
G2427-S250 22 000 25000