Ryobi RA-MSS20-B User manual

AIR SHEAR
OPERATOR'S MANUAL
ORIGINAL INSTRUCTIONS
RA-MSS20-B

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

1. Shear head
2. Trigger
3. Air inlet
4. Exhaust deector
5. Nitto style coupler
6. Fixed blade 1
7. Fixed blade 2
8. Movable blade
9. Seated bushing
10. Hex wrench
11. Hex bolt
12. Workpiece
DESCRIPTION
12
3
Fig.1 Fig.2
Fig.4
Fig.5 Fig.6
12
3
5
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
7
68
10
9
11
Fig.3
4
2

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 nibbler or shear. Failure to do so can result in
serious bodily injury.
■Only qualified and trained operators should install,
adjust or use the nibbler or shear.
■Do not modify this nibbler or shear. 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 nibbler or shear 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.
PROJECTILE HAZARDS
■Disconnect the nibbler or shear from the energy
source when changing inserted tool or accessories.
■Be aware that 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 tool. The grade of protection required
should be assessed for each use.
■Ensure that the work piece is securely fixed.
■Ensure that metal cuttings are directed so as not to
cause a hazard.
OPERATING HAZARDS
■Use of nibblers and shears can expose the operator's
hands to hazards including cuts, abrasions and heat.
■Avoid contact with the cutter whenever the nibbler or
shear is connected to the power supply; cutting with
nibblers and shears creates sharp edges.
■Wear relevant protective equipment such as gloves.
■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.
■Avoid direct contact with the inserted tool during and
after use as it can become hot.
■Sharp tools should always be used.
■Avoid unsuitable postures as it is likely for these
positions not to allow counteracting of normal or
unexpected movement of the tool.
■Unexpected tool movement or breakage of cutters can
cause injuries.
■Warnings shall be given against the risk of explosion
or fire due to the material being processed.
REPETITIVE MOTIONS HAZARDS
■When using a nibbler or shear 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 nibbler or shear, the operator should
adopt a comfortable posture whilst maintaining 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 nibbler or shear 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
manufacturer of nibblers or shears; do not use other
types or sizes of accessories or consumables.
■Cutters can become hot during use; do not touch.
■Do not use cracked or deformed accessories or
inserted tools.
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 nibbler or shear 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 nibblers and
shears can cause ill health (for example cancer, birth

2
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 nibbler or shear 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 and 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 instruction handbook 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.
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 nibbler or shear 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 nibbler or shear has a silencer, always ensure it
is in place and in good working order when the nibbler
or shear 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-
7 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
nibbler or shear, tell your employer and consult a
physician.
■Operate and maintain the nibbler or shear as
recommended in this instruction handbook, to prevent
an unnecessary increase in vibration.
■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.
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.
■Cold air shall be directed away from hands.
■Whenever universal twist couplings (claw couplings)
are used, lock pins shall be installed and whipcheck
safety cables shall be used to safeguard against
possible hose-to-tool or hose-to-hose 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.

3
Wear eye protection.
Wear ear protection.
Lubricate with air tool oil daily.
SPECIFICATIONS
Avg. air consumption 114 L/min (4 cfm)
Maximum material thickness 1.2 mm (20 gauge)
Maximum working pressure 6.3 bar (90 psi)
Weight 1.11 kg
Air inlet size 6.35 mm (1/4”)
Air hose ID 9.52 mm (3/8”)
A-weighted sound pressure
level 90.4dB(A), k=3dB
Sound power level 101.4dB(A), k=3dB
Vibration value 2.5 m/s2
Uncertainty 0.45 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 cutting. It features a hardened
steel barrel and piston for less wear and longer life. It
has a lightweight aluminium pistol-grip housing and rear
exhaust. Any other use is forbidden.
The product is mainly used for shearing different types of
plastics and all types of aluminum, tin and steel.
– Heavy-duty shear head provides a long life and
reliable cutting
– Lightweight composite material housing
– Soft grip for extra comfort and control
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.
3. Danger of injury and property damage caused by
ying objects.
AIR SUPPLY AND OPERATION
■Ensure the 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.
■Do not use any additional force upon the product.
■Do not allow the product to free run for an extended
period of time as this will shorten its life.
■Always ensure that the accessories such as blades,
discs, sockets, etc. are rated/designed for use with the
machine. Also correctly and securely fastened before
connecting the machine to the air supply.
■Release the start and stop device in the case of an
interruption of the power supply.
■Disconnect the product from the power source before
changing accessories or making adjustments.
■Required air pressure of 6.3 bar (90 psi), and an air
flow according to specifications.
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.

4
●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
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.
■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 product 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
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.
■Clean the air inlet filter weekly.
TROUBLESHOOTING
WARNING
If any of the following symptoms appears during
operation, stop using the product immediately, or
serious personal injury could result. Only qualied
persons or an authorised service centre can perform
repairs or replacement of the product.
Disconnect the product from the air supply before
attempting repair or adjustment. When replacing O-rings
or cylinder, lubricate with air tool oil before assembly.
PROBLEM: Product 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: Product runs slowly. Air ows slightly
from exhaust.
POSSIBLE CAUSES
■Motor parts are jammed with dirt particles.
■Power 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 the product in short bursts quickly reversing
rotation back and forth where applicable.
■Repeat above as needed.

5
PROBLEM: Product 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 the product 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: Product 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 Housing 13 Compression Spring 25 Washer 37 Fixed blade 1
02 Pin 2.5 x 23 14 Trigger 26 Gear wheel 38 Fixed blade 2
03 Exhaust deector 15 Bolt M4 x 6 27 Idle gear 39 Bolt M5 x 30
04 Air inlet plug 16 O-ring 31 x 1.6 28 Pin 40 Chuck
05 Dust cap 17 Seal 29 Gear shaft 41 Movable blade
06 Valve stem 18 Bearing 626Z 30 Bearing 6201Z
07 O-ring 4 x 2 19 End plate 31 Connector
08 O-ring 4 x 1.1 20 Cylinder 32 Washer
09 O-ring 12 x 3 21 Rotor blade 33 Bearing R8
10 Bushing 22 Steel wire 34 Eccentric shaft
11 Reverse lever 23 Rotor 35 Head
12 O-ring 11.5 x 1.8 24 Front plate 36 Ination nut

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