Ryobi RA-DG14-B User manual

AIR DIE GRINDER
OPERATOR'S MANUAL
ORIGINAL INSTRUCTIONS
RA-DG14-B

Important!
It is essential that you read the instructions in this manual before
operating this machine.
Subject to technical modifications.

1. Collet
2. Collet nut
3. Spindle/Collet seat
4. Trigger lock pin
5. Trigger
6. Valve pin
7. Air inlet
8. Nitto style coupler
9. Grinding head
10. Wrench
11. Air regulator adj.
knob
DESCRIPTION
Fig.1 Fig.2
Fig.3 Fig.4
Fig.5 Fig.6
9
9
2
4
3
1
65
7
25
7
8
10
10
3
2
11
45
Fig.7
Quick
connector
Quick
connector Lubricator Filter
Cut-off
valve
Regulator
(0-8.5 bar)
Quick
coupler
Tool Air
compressor
Quick
coupler
Air hose

1
GENERAL SAFETY RULES
■For multiple hazards, read and understand the safety
instructions before installing, operating, repairing,
maintaining, changing accessories on, or working
near, the grinder. Failure to do so can result in serious
bodily injury.
■Only qualified and trained operators should install,
adjust or use the die grinder.
■Do not modify this die grinder. Modifications can
reduce the effectiveness of safety measures and
increase the risks to the operator.
■Do not discard the safety instructions; give them to the
operator.
■Do not use the die grinder if it has been damaged.
■Tools shall be inspected periodically to verify that the
ratings and markings required by this part of ISO 11148
are legibly marked on the tool. The employer/user
shall contact the manufacturer to obtain replacement
marking labels when necessary.
■Check the speed and make a simple check of the
vibration level after each service.
■Special care has to be taken when assembling the
speed governor or protective devices.
■Check the speed after each service in relevant cases.
■The spare parts would not affect the health and safety
of the operator.
PROJECTILE HAZARDS
■Be aware that the failure of the work piece, or
accessories, or even of the inserted tool itself, can
generate high-velocity projectiles.
■Always wear impact-resistant eye protection during
operation of the die grinder or when changing
accessories on the tool. The grade of protection
required should be assessed for each use.
■Ensure that the work piece is securely fixed.
■Check regularly that the speed of the die grinder is
not higher than that marked on it. These speed checks
shall be carried out without the abrasive product
mounted and in accordance with the instructions given
by the manufacturer.
■Ensure that sparks and debris resulting from use do
not create a hazard.
■Disconnect the grinder from the energy supply before
changing abrasive product and servicing.
■The risks to others should also be assessed at this
time.
ENTANGLEMENT HAZARDS
Choking, scalping and/or lacerations can occur if loose
clothing, personal jewelry, neck wear, hair or gloves are
not kept away from the tool and accessories.
OPERATING HAZARDS
■Avoid contact with the rotating spindle and inserted
tool to prevent cutting of hands and other body parts.
■Use of the tool can expose the operator's hands to
hazards, including cuts and abrasions and heat. Wear
suitable gloves to protect hands.
■Operators and maintenance personnel shall be
physically able to handle the bulk, weight and power
of the tool.
■Hold the tool correctly; be ready to counteract normal
or sudden movements and have both hands available.
■Maintain a balanced body position and secure footing.
■Release the start-and-stop device in the case of an
interruption of the energy supply.
■Use only lubricants recommended by the manufacturer.
■Personal protective safety glasses shall be
used; suitable gloves and protective clothing are
recommended.
■A rotary file shall not be operated at a speed exceeding
the rated speed.
■For overhead work, wear a safety helmet.
■Be aware that there is a running-on of the rotary
inserted tool after the start-and-stop device has been
released.
■Warnings shall be given against the risk of explosion
or fire due to the material being processed.
Note: For turbine die grinders, the stopping time can be of
the order of several seconds.
REPETITIVE MOTIONS HAZARDS
■When using a die grinder to perform work-related
activities, the operator can experience discomfort in
the hands, arms, shoulders, neck or other parts of the
body.
■While using a die grinder, the operator should adopt
a comfortable posture whilst maintaining a secure
footing and avoiding awkward or off-balance postures.
The operator should change posture during extended
tasks; this can help avoid discomfort and fatigue.
■If the operator experiences symptoms such as
persistent or recurring discomfort, pain, throbbing,
aching, tingling, numbness, burning sensations or
stiffness, these warning signs should not be ignored.
The operator should tell the employer and consult a
qualified health professional.
ACCESSORY HAZARDS
■Disconnect the die grinder from the energy supply
before fitting or changing the inserted tool or accessory.
■Use only sizes and types of accessories and
consumables that are recommended by the die
grinder manufacturer; do not use other types or sizes
of accessories or consumables.

2
■Avoid direct contact with the inserted tool during and
after use as it can be hot or sharp.
■The maximum operating speed of the inserted tool
shall equal or exceed the rated speed marked on the
tool.
■Never mount a grinding wheel, cut-off wheel or router
cutter on a die grinder. A grinding wheel that bursts
can cause very serious injury or death.
■Do not use mounted wheels which are chipped or
cracked or which could have been dropped.
■Use only permitted inserted tools of the correct shaft
diameter.
■Pay attention to the fact that the permitted speed
of the mounted point has to be lowered due to the
increase of the length of the shaft between the end
of the collet and the mounted point (overhang). Make
sure that the minimum gripping length of 10 mm is
observed (see Figure 1 and the recommendations of
the manufacturer of mounted points).
■Be aware of the risk of mismatching the diameter of
the shaft of the mounted point and that of the collet.
WORKPLACE HAZARDS
■Slips, trips and falls are major causes of workplace
injury. Be aware of slippery surfaces caused by use of
the tool and also of trip hazards caused by the air line
or hydraulic hose.
■Proceed with care in unfamiliar surroundings. There
can be hidden hazards, such as electricity or other
utility lines.
■The die grinder is not intended for use in potentially
explosive atmospheres and is not insulated against
contact with electric power.
■Ensure that there are no electrical cables, gas pipes,
etc., which can cause a hazard if damaged by use of
the tool.
DUST AND FUME HAZARDS
■Dust and fumes generated when using die grinders
can cause ill health (for example cancer, birth
defects, asthma and/or dermatitis); risk assessment
and implementation of appropriate controls for these
hazards are essential.
■Risk assessment should include dust created by the
use of the tool and the potential for disturbing existing
dust.
■Operate and maintain the die grinder as recommended
in these instructions, to minimize dust or fume
emissions.
■Direct the exhaust so as to minimize disturbance of
dust in a dust-filled environment.
■Where dust or fumes are created, the priority shall be
to control them at the point of emission.
■All integral features or accessories for the collection,
extraction or suppression of airborne dust or fumes
should be correctly used and maintained in accordance
with the manufacturer's instructions.
■Select, maintain and replace the consumable/inserted
tool as recommended in the instructions, to prevent an
unnecessary increase in dust or fumes.
■Use respiratory protection in accordance with
the employer's instructions and as required by
occupational health and safety regulations.
■Working in certain materials creates emission of
dust and fumes, causing a potentially explosive
environment.
NOISE HAZARDS
■Exposure to high noise levels can cause permanent,
disabling hearing loss and other problems, such as
tinnitus (ringing, buzzing, whistling or humming in the
ears). Therefore, risk assessment and implementation
of appropriate controls for these hazards are essential.
■Appropriate controls to reduce the risk may include
actions such as damping materials to prevent work
pieces from “ringing”.
■Use hearing protection in accordance with employer's
instructions and as required by occupational health
and safety regulations.
■Operate and maintain the die grinder as recommended
in the instruction handbook, to prevent an unnecessary
increase in the noise level.
■Select, maintain and replace the consumable/inserted
tool as recommended in the instruction handbook, to
prevent an unnecessary increase in noise.
■If the die grinder has a silencer, always ensure that
it is in place and in good working order when the die
grinder is being operated.
VIBRATION HAZARDS
The information for use shall draw attention to vibration
hazards that have not been eliminated by design and
construction and remain as residual vibration risks. It shall
enable employers to identify the circumstances in which
the operator is likely to be at risk from vibration exposure.
If the vibration-emission value obtained using ISO 28927-
12 does not adequately represent the vibration emission
in the intended uses (and foreseeable misuses) of the
machine, additional information and/or warnings shall be
supplied to enable the risks arising from vibration to be
assessed and managed.
■Exposure to vibration can cause disabling damage to
the nerves and blood supply of the hands and arms.
■Wear warm clothing when working in cold conditions
and keep your hands warm and dry.
■If you experience numbness, tingling, pain or whitening
of the skin in your fingers or hands, stop using the die
grinder, tell your employer and consult a physician.
■Operate and maintain the die grinder as recommended
in the instruction handbook, to prevent an unnecessary

3
increase in vibration levels.
■Select, maintain and replace the consumable/inserted
tool as recommended in the instruction handbook, to
prevent an unnecessary increase in vibration levels.
■Support the weight of the tool in a stand, tensioner or
balancer if possible.
■Hold the tool with a light but safe grip, taking account
of the required hand reaction forces, because the risk
from vibration is generally greater when the grip force
is higher.
■An improperly mounted or damaged inserted tool can
cause excessive vibration levels.
ADDITIONAL SAFETY INSTRUCTIONS FOR PNEU-
MATIC POWER TOOLS
■Air under pressure can cause severe injury.
■Always shut off air supply, drain hose of air pressure
and disconnect tool from air supply when not in use,
before changing accessories or when making repairs.
■Never direct air at yourself or anyone else.
■Whipping hoses can cause severe injury. Always
check for damaged or loose hoses and fittings.
■Whenever universal twist couplings (claw couplings)
are used, lock pins shall be installed and whip check
safety cables shall be used to safeguard against
possible hose-to-tool connection failure.
■Do not exceed the maximum air pressure stated on
the tool.
■Never carry an air tool by the hose.
SYMBOLS
Safety alert
CE conformity
Please read and understand all instructions
before operating the product, follow all
warnings and safety instructions.
Please read the instructions carefully before
starting the product.
Wear eye protection.
Wear ear protection.
Lubricate with air tool oil daily.
SPECIFICATIONS
Grinder cap 6.35 mm (1/4”)
No-load speed 23,000/min
Air consumption 128.5 L/min (4.5 cfm)
Maximum working pressure 6.3 bar (90 psi)
Air inlet size 6.35 mm (1/4”)
Air hose ID 9.52 mm (3/8")
Weight 0.54 kg
A weighted sound pressure level 86.1dB(A), k=3dB
Sound power level 97.1dB(A), k=3dB
Vibration value 2.9 m/s2
Uncertainty 1.1 m/s2
Noise emission values are in accordance with
EN ISO 4871 and EN ISO 15744.
Vibration emission values are in accordance with
EN12096 and EN28662-1.
APPLICATION
The product is ideal for light weld grinding, porting and
polishing applications. The durable and lightweight
composite housing design also helps reduce vibration.
It has a lever lock throttle for safety. Any other use is
forbidden.
The product can be used for all kinds of mold, metal
products and handicrafts, the manufacturing of circuit
boards, blank nishing and grinding nishing.
The product is great for high speed grinding, porting,
smoothing, general polishing and deburring.
The composite-material housing is lightweight and easy
to use.
RESIDUAL RISKS
Even if you are operating this product in accordance
with all the safety requirements, potential risks of injury
and damage remain. The following dangers can arise in
connection with the structure and design of this product:
1. Health defects resulting from vibration and noise
emission if the product is being used over long periods
of time or not adequately managed and properly
maintained.
2. Injuries and damage to property due to broken cutting
attachments or the sudden impact of hidden objects
during use.

4
3. Danger of injury and property damage caused by
ying objects.
AIR SUPPLY AND OPERATION
■Ensure air valve (or trigger) is in the “off” position
before connecting to the air supply.
■Connect the product to the air hose.
■Press the trigger to operate the product.
■The air regulator controls the amount of air flow
entering the rotor. Turn the air regular adjustment
knob to decrease/increase the speed of the product.
■Do not use any additional force upon the tool.
■Do not allow the product to free run for an extended
period of time as this will shorten its life.
■There is a risk of mismatching the diameter of the shaft
of mounted point and that of the collet.
■There is a risk of excessive vibration levels due to
improper mounting or damaged insert tool.
■There is a risk of running on of the inserted tool after
the start and stop device has been released.
■Only permitted insert tools of the correct shaft diameter
are used.
■Cutting-off wheels and routing cutter wheels shall not
be used.
■Release the start and stop device in the case of an
interruption of the air supply.
■Disconnect the product from the air supply before
changing accessories or making adjustments.
■Required air pressure of 6.3 bar (90 psi), and an air
flow according to specifications.
■Insert the grinder head to the collet nut.
■Tighten the collet nut for securing grinder head by the
provided wrench.
■Before operation, ensure the inserted tool is fixed in
the product.
WARNING
Ensure the air supply is clean and does not exceed
6.3 bar (90 psi) while operating the product. Too high an
air pressure and unclean air will shorten the product's
life due to excessive wear, and may be dangerous
causing damage and/or personal injury.
LUBRICATION
An automatic in-line lter-regulator-lubricator is
recommended (Fig. 7) as it increases product life and
keeps the product in sustained operation. The in-line
lubricator should be regularly checked and lled with air
tool oil.
Proper adjustment of the in-line lubricator is performed by
placing a sheet of paper next to the exhaust ports and
holding the throttle open for approximately 30 seconds.
The lubricator is properly set when a light stain of oil
collects on the paper. Excessive amounts of oil should be
avoided.
If it becomes necessary to store the product for an extended
period of time (overnight, weekend, etc.), it should receive
a generous amount of lubrication at that time. The product
should be run for approximately 30 seconds to ensure oil
has been evenly distributed throughout the product. The
product should be stored in a clean and dry environment.
●It is most important that the product be properly
lubricated by keeping the air line lubricator filled
and correctly adjusted. Without proper lubrication
the product will not work properly and parts will
wear prematurely.
●Use correct lubricant in the air line lubricator. The
lubricator should be of low air flow or changing air
flow type, and should be kept filled to the correct
level. Use only recommended lubricants, specially
made for pneumatic applications. Substitutes
may harm the rubber compounds in the product's
O-rings and other rubber parts.
IMPORTANT!
See Figure 7.
If a lter/regulator/lubricator is not installed on the air
system, air operated tools should be lubricated at least
once a day or after 2 hours of work with 2 - 6 drops
of oil, depending on the work environment, directly
through the male tting in the tool housing.
LOADING AND OPERATION
WARNING
Drain the air tank daily. Water in the air line will damage
the tool.
■Clean the air inlet filter weekly.
■Line pressure should be increased to compensate for
unusually long air hoses (over 8 metres). The minimum
hose diameter should be 6.35 mm (1/4”) I.D. and the
fittings must have the same inside dimensions.
■Keep hose away from heat, oil and sharp edges. Check
hose for wear, and make sure that all connections are
secure.
■Use the tool only for its intended purpose.
MAINTENANCE
■Keep the product safe by regular maintenance.
■Always keep your air tool clean and lubricated. Daily
lubrication is essential to avoid internal corrosion and

5
possible failure.
■Maintenance shall be performed weekly.
■Drain the air tank daily. Water in the air line will
damage the product.
■If the product cannot be used anymore, make sure to
dispose of it so as not to impose hazards on people
and the environment.
■Air tool white oil is recommended for lubrication.
■Only lubricants recommended by the manufacturer
should be used.
TROUBLESHOOTING
WARNING
If any of the following symptoms appears during
operation, stop using the tool immediately, or serious
personal injury could result. Only qualied persons or
an authorised service centre can perform repairs or
replacement of the tool.
Disconnect tool from the air supply before attempting
repair or adjustment. When replacing O-rings or cylinder,
lubricate with air tool oil before assembly.
PROBLEM: Tool runs at normal speed but fails under
load.
POSSIBLE CAUSES
■Motor parts are worn.
■Cam clutch is worn or sticking due to lack of lubricant.
REMEDIES
■Lubricate clutch housing.
■Check for excess clutch oil. Clutch cases need only
be half full. Overfilling can cause drag on high speed
clutch parts, i.e. a typical oiled/lubricated tool requires
14.20 ml (1/2 ounce) of oil.
Grease lubrication
NOTE: Heat usually indicates insufficient grease in
chamber. Severe operating conditions may require
more frequent lubrication.
PROBLEM: Tool runs slowly. Air ows slightly from
exhaust.
POSSIBLE CAUSES
■Motor parts are jammed with dirt particles.
■Air regulator is in closed position.
■Air flow is blocked by dirt.
REMEDIES
■Check air inlet filter for blockage.
■Pour air tool lubricating oil into air inlet as per
instructions.
■Operate tool in short bursts quickly reversing rotation
back and forth where applicable.
■Repeat above as needed.
PROBLEM: Tool will not run. Air flows freely from
exhaust.
POSSIBLE CAUSE
One or more motor vanes are stuck due to material
build up.
REMEDIES
■Pour air tool lubricating oil into air inlet.
■Operate tool in short bursts of forward and/or reverse
rotation where applicable.
■Tap motor housing gently with a plastic mallet.
■Disconnect the air supply. Free the motor by rotating
drive shank manually where applicable.
■If the product remains jammed, return to the service
centre.
PROBLEM: Tool will not shut off.
POSSIBLE CAUSE
‘O’ rings throttle valve is dislodged from seat inlet
valve.
REMEDY
Replace the ‘O’ ring.
NOTE: Repairs should be carried out by a qualied
person.
20161209v2

6
PARTS LIST
No. Description No. Description No. Description No. Description
01 Air inlet 10 Screw cap 19 Bolt 2 x 6 28 Retainer ring
02 Mufe cover 11 Trigger 20 Cylinder 29 Front plate
03 Valve stem 12 Roll pin 3 x 14 21 Rotor 30 Collet seat
04 O-ring 4.8 x 1.6 13 Spring 22 Rotor blade 31 Collet
05 O-ring 5.6 x 2 14 Trigger lock pin 23 Washer 32 Collet screw
06 Spring 15 Roll pin 2 x 18 24 Bushing 33 Washer
07 Air regulator 16 Gun body 25 Front cap
08 O-ring 7 x 2 17 Bearing 626Z 26 Bearing 6000Z
09 O-ring 12 x 3 18 Cylinder cap 27 Steel ball dia.=2

Techtronic Industries (Australia) Pty. Ltd.
31 Gilby Road
Mt Waverley, VIC 3149, Australia
Techtronic Industries New Zealand Ltd.
2 Landing Drive, Mangere
Auckland, New Zealand 2022