Sumake ST-6920 User manual

SUMAKE PNEUMATIC TOOLS
Air Spin-Pull Rivet Nut Tool
ST-6920(A)
SUMAKE INDUSTRIAL CO., LTD
4F,NO.351,Yangguang St.,Neihu District TAIPEI, TAIWAN, ZIP:114-91
Specification:
Rivet Capacity
1/4"-20, 5/16"-18, 1/2"-13, #8-32,
#10-24, #10-32, #3/8-16
(M4, M5, M6, M8, M10, M12)
Tractin Power
6800 lbs (3100 kg)
Stroke Length
0.276”(7 mm)
Air Inlet (PT)
1/4” (6.35 mm)
Air Hose (I.D.)
3/8” (10 mm)
Air Pressure
85~95 psi (6~6.7 bar)
Net Weight
11.66 lbs (5.3 kg)
Noise and Vibration:
Vibration
EN ISO 20643
Noise
EN ISO 15744
Remark
Load:
< 2.5 m/s²
Sound Pressure Level
No load: 84 dB(A)
Please always
wear ear
protector at
environment
noise level >
80 dB(A) due
to risk of
impaired
hearing!
Sound power level
No load: 95 dB(A)
Uncertainty
K= 1.5 m/s²
Uncertainty
K= 3dB
ST-6920(A)-S-2212D-CPF

ST-6920 Air Hydraulic Rivet-Nut Tool
★Working Instructions ★
※Operating Instructions :
(A)-1 Slightly push the Trigger #110 with the middle finger to spin threaded insert onto the Bolt Spindle ( #1)
(A)-2 Push Trigger (#110) fully with the middle finger to pull & squeeze the threaded insert.
★ Please be sure only ONE time Push the Trigger.
Do NOT allow Twice push the trigger to install same one rivet nut
(B)-1 After squeeze completely, push the reverse Botton (#103) to release the tool backward.
※Change Bolt spindle for different size of threaded Insert
(C)-1 Release Nut (#3) to remove Nut Anvil (#2)
(C)-2 Insert the Pin (#120) through the side hole of Head (#4) into the center hole of Spring Pin,
and, draw backward direction of the tool, to separate the Bolt Spindle (#1) from Hexagon Bit (#7)
so the Bolt Spindle (#1) can be removed.
※REPEAT #(C)-2 to replace another New, different size of Bolt Spindle (#1 ).
※ How to adjust the Stroke : Mini. 0mm ←→Max. 7 mm
( *** Important *** ALWAYS adjust the STROKE before operate )
(D)-1 Always Press the Trigger (#110) , so that you can Adjust the Stroke easily & safely.
(D)-2 Simply adjust the Stroke by turning the adjustable Bushing (#6) on the bigger hole of Head (#4)
to a correct Stroke : Mini. 0 mm ←→Max. 7 mm
ST-6920-I-1508B1-CP

Foreword
Sumake is a manufacturer and exporter of air
tools since established. We have devote all our
efforts in improving quality and tools’ life. As
well as the noise and vibration of tools. Bring all
of you working efficiences, profits, and enjoy
using the tool is our principle.
Operator‘s instruction
1. Main Applications
This tool has a strong traction power and light
weight only 1.5 kgs. All rivets from 3/32” to
3/16” in all kind of material can be applied with
this tool. This advantage performance make you
job easily.
2. Cautions for Use
2-1 Air pressure
Maximum performance is displayed at the proper
sanding speed, obtainable at a gauge pressure of
6.2 bar. Range-wise, this is an air pressure from 5
to 7 bar (70 to 100 psi)
57
2-2 Air line
Use a 3/4“ air hose between the compressor and
the tool . Compressed air is cooled and its water
content separated, as soon as the air leaves the
compressor. A portion of the water content,
however, is condensed in the piping, and can
enter the tool mechanism, and may cause trouble.
So, install an air filter and on oiler between the
compressor and the tool. Use a 3 HP or larger
compressor for each sander.
Tool
Nipple
Coupler Recoil
hose
Leader
hose
Oiler Regulator
Water
separation Air supply
Drain
daily
2-3 Air hose
Clean the hose with a blast of compressed air
before connecting the hose to air tool. This will
prevent both moisture and dust within the hose
from entering the tool and causing possible rust
or malfunction. To compensate for unusually
long hose (over 25 ft), the line pressure should be
increased accordingly.
Drainage
2-4 Inserted tools
Use only the socket or adapter which are in good
condition for use. The intended socket and
adapter for this air tool could are stated as
“Square Drive” on the specification list.
2-5 The approved eye protector, ear-muff,
mouth-muffle, and gloves shall be worn when
operate this tool.
2-6 The working place shall be ventilative.
2-7 Release the on-off device in the case of
energy supply failure.
3. Operation Method
3.1 On-off device
The on-off device is on the inner or outer contour
of the grip. It is a “hold-to-run” type. This tool
stops rotation within few sec, after releasing the
lever. For the sake of safety, place it on a level
plate or on hanger after it completely stops.
3.2 Torque Adjuster
You can adjust the torque by rotating the
knob which indicated by 1 to 6. “1” indicates
the
smallest torque output and “6”indicts the largest
torque output.
3.3 RotatingDirection
One shall make sure the direction of rotation
before actuate this tool. The“F”indicts foreword
and the “R“ indicts reverse. Forward is defined
as clockwise direction seen from the operator‘s
position.
4. Maintenance
4-1 Lubrication
Before connecting the hose , apply 4 or 5 drops
of #60 spindle oil at the air inlet. Use of a thicker
oil can lead to reduced performance or
malfunction. If a thicker oil is used by accident,
wash it away immediately. Also, every 3 or 4
hours of operation, oiling is necessary.
4-2 Storage
Avoid storing the tool in a location subject to
high humidity. If the tool is left as it is used , the
residual moisture inside the tool can cause rust.
Before storing and after operation, oil the tool at
the air inlet with spindle oil and run it for a short
time.
4-3 Disposal
If the tool is too seriously damaged to be used
anymore, drop it in a resource recycling can.
Never drop it into fire.
4-4 Ordering service Parts
For further operational and handling information
or for replacement of parts and components,
contact the sale agent from whom you purchased
the tool or the service division of our company.
*In ordering parts and components, give each
part number, name and quantity.
Warning
1. The power toll shall not be used in potentially
explosive atmospheres.
2. Disconnect the air hose before changing or
adjusting any inserted tools.
3. Prevent long hair or loose clothing from
drawing in while operate this tool.
4. Keep your body in well balancedposition and
always wear gloves to reduce the risk of crushing
caused by torque between handle and workpiece.
5. Unexpected direction of rotating could cause a
hazardous situation.
6. Slip/Trip/Fall is a major reason of serious
injury or death. Beware of excess hose left on the
walking or work surface.
7. Wearing eye/face protector could reduce the
danger to person from high speed splinters being
emitted from this tool in the case of inserted tool
failure or emitted fromthe workpiece.
8. Wearing mouth-muff could avoid inhaling dust
or handling debris from work process that can be
harmful to your health.
9. Excessive high air pressure and too much free
rotation may speed the wear of this tool and
might causedanger situation.
ST-6920-I-1508B-CP

EC DECLARATION OF CONFORMITY
We: SUMAKE INDUSTRIAL CO., LTD.
4F, No. 351, Yangguang St., Neihu District, Taipei City, Taiwan
declare in sole responsibility that the equipment
Equipment：AIR SPIN-PULL RIVET NUT TOOL
Model/ Serial No.：ST-6920(A)
to which this declaration applies, complies with these normative documents:
Machinery Directive: 2006/42/EC
and conforms to the following EN standard,
EN ISO 12100: 2010
EN ISO 11148-1:2011
Name and Signature/Position Date and Place
2022/11/1
Mike Su –Managing Director Taipei, Taiwan
ST-6920(A)-D-2212D-CPF

ST-6920(A) AIR SPIN-PULL RIVET NUT TOOL
ST-6920(A)-P-2212G-CP

ST-6920(A) AIR SPIN-PULL RIVET NUT TOOL
PARTS LIST
No. Parts No. Description Q'ty No. Parts No. Description Q'ty
1 6920-01B Bolt M10 1 76 6920-76 Low Valve Rod 1
2 6920-02B Nut Anvil M10 1 77 6920-77 O-Ring Seal 1
3 6920-03 Nut 1 78 6920-78 Valve Plate 1
4 6920-04 Head 1 79 6920-79 Valve Pressure Spring 1
5 6920-05 Nut 1 80 6920-80 O-Ring 1
6 6920-06 Adjustable Bushing 1 81 6920-81 Screw Plug 1
7 6920-07 Hexagon Bit 1 82 6920-82 Lock Nut 1
8 6920-08 Spring Pin 1 83 6920-83 Return spring 1
9 6920-09 Bolt Bushing 1 84 6920-84 Tube Connector 1
10 6920-10 Spring 1 85 6920-85 Valve Cap 1
11 6920-11 Nut 1 86 6920-86 Washer 2
12 6920-12 Nut Ring 1 87 6920-87 O-Ring 1
13 6920-13 Ring Washer 2 88 6920-88 Valve Stem 1
14 6920-14 X-Ring Seal 2 89 6920-89 O-Ring 1
15 6920-15 O-Ring 2 90 6920-90 Valve Bush 1
16 6920-16 Oil Plug 1 92 6920-92 Air Cylinder Cap 1
17 6920-17 Fill Washer 1 93A 6920-93A Plunger Rod 1
18 6920-18 O-Ring Seal 1 94 6920-94 Piston Disc 1
19 6920-19 Hydraulic Plunger [Incl. 21] 1 95 6920-95 O-Ring Seal 2
20 6920-20 Valve Rod 2 96 6920-96 Inner Tooth Washer 1
22 6920-22 Shaft 1 97 6920-97 Nut 1
23 6920-23 Spring 1 98 6920-98 Clip 1
24 6920-24 Spring 1 99 6920-99 Hand Grip 1
25 6920-25 Washer Nut 1 100 6920-100 Retaining Ring 1
26 6920-26 Ball Bearing 1 102 6920-102 Spring 1
27 6920-27 Washer 1 103 6920-103 Button 1
28 6920-28 Screw Bushing 1 104 6920-104 Screw Bush 1
29 6920-29 Hydraulic Section 1 105 6920-105 O-Ring Seal 1
30S 6920-30S Gear Spindle Set [Incl. 30, 36, 37(6)] 1 106 6920-106 O-Ring 1
31 6920-31 Gear 3 107 6920-107 Adaptor 1
32 6920-32 Ring Gear 1 108 6920-108 Pin 1
33 6920-33 Ball Bearing 1 109 6920-109 Pin 1
34 6920-34 O-Ring 2 110 6920-110 Trigger 1
35 6920-35 Front Plate 1 111 6920-111 Trigger Rod 1
37 6920-37 Rotor Blade 6 112 6920-112 Universal Joint 1
38 6920-38 Cylinder 1 114 6920-114 Damping Ring 2
39 6920-39 Pin 1 117 6920-117 Muffler Bush 1
40 6920-40 End Plate 1 118 6920-118 Rubber Cushion 1
42 6920-42 Ball Bearing 1 119 6920-119 O-Ring Seal 1
43 6920-43 Motor Housing 1 121 6920-121 Gasket 1
44 6920-44 O-Ring Seal 3 126 6920-126 O-Ring Seal 1
45 6920-45 Tube 2
46 6920-46 Motor Housing Cover 1 6920-01A Bolt M12 1
47 6920-47 Screw 2 6920-01C Bolt M8 1
48 6920-48 Screw Bushing 2 6920-01D Bolt M6 1
49 6920-49 Rubber Plate 3 6920-01E Bolt M5 1
50 6920-50 Valve Muffler 2 6920-01F Bolt M4 1
51 6920-51 Valve Plate 1 6920-01G Bolt 1/4"-20 1
52 6920-52 Exhaust Cap 1 6920-01H Bolt 5/16"-18 1
53 6920-53 Nut 1 6920-01I Bolt 1/2"-13 1
54 6920-54 O-Ring Seal 2 6920-01J Bolt 3/8"-16 1
55A 6920-55A O-Ring Seal 2 6920-01K Bolt #8-32 1
56A 6920-56A O-Ring Washer 2 6920-01L Bolt #10-24 1
57A 6920-57A Screw Plug 1 6920-01M Bolt #10-32 1
58 6920-58 O-Ring Seal 1 6920-02A Nut Anvil M12 1
59 6920-59 O-Ring 1 6920-02C Nut Anvil M8 1
60 6920-60 Gasket 1 6920-02D Nut Anvil M6 1
61 6920-61 Air Cylinder 1 6920-02E Nut Anvil M5 1
62 6920-62 Trigger Lever 1 6920-02F Nut Anvil M4 1
63 6920-63 Pin 1 6920-02G Nut Anvil 1/4"-20 1
64 6920-64 Valve Stem 1 6920-02H Nut Anvil 5/16"-18 1
65 6920-65 Valve Spring 1 6920-02I Nut Anvil 1/2"-13 1
66 6920-66 O-Ring Seal 2 6920-02J Nut Anvil 3/8"-16 1
67 6920-67 Valve Bushing 1 6920-02K Nut Anvil #8-32 1
68 6920-68 O-Ring Seal 4 6920-02L Nut Anvil #10-24 1
69 6920-69 Valve Plate 1 6920-02M Nut Anvil #10-32 1
70 6920-70 Valve Plate Washer 1 116 6920-116 Hanging Ring 1
71 6920-71 Pin 1 120 6920-120 Pin 1
72 6920-72 Tube 1 122 6920-122 Wrench 24/27mm 1
73 6920-73 Low Valve Bushing 1 123 6920-123 Hex. Wrench 1
74 6920-74 Screw M4 1 124 6920-124 Oil Syringe 1
ST-6920(A)-P-2212G-CP
*** ACCESSORIE ***
1
2

RIVETER
Original instructions
SUMAKE Industrial Co. Ltd.

1
Read all these safety instructions before operating this product and save these instructions.
The tool has been manufactured in conformity with the instruction of EU machine directive. The EU mark will be considered void in the event
of inexpert repairs, the use of non-original parts and in case of non-observance of the safety instructions in the user’s manual.
Possible direct or indirect consequential damages are not the responsibility of SUMAKE Industrial co., Ltd.
General safety rules:
1. Watch the tool at all times when in use.
2. People under the influence of alcohol or drugs are not allowed to use, repair or maintain the tool.
3. Keep unqualified persons, children, etc. away from the tool.
4. Keep work area clean and with sufficient daylight or artificial lighting. The work area on which the machine is used must be cleaned up.
Disorder is a potential cause of accidents.
5. Danger of explosion. Never use oxygen and combustible gas as an air supply for the tool which many be ignited by spark and cause fire
or explosion.
6. Never use gasoline or other flammable liquids to clean the tool.
7. Do not use air tools in potentially explosive atmospheres such as in the presence of flammable liquids, cleaning solvents, fluid energy or
stored gases.
8. Do not expose air tools to rain. Do not use air tools in damp or wet locations.
9. When a fault or failure is detected, the tool must immediately be disconnected from the air supply and returned for repair.
10. It is not permitted to modify the tool in any way.
11. When not in use, keep tools in a dry place, either locked up or in a high place, out of the reach of children.
12. Do not force small air tools to do the job of a heavy –duty task. Do not use air tool for purpose of which was not intended.
13. Wear suitable ear protection at environment noise level >80dB(A) and safety spectacles when using the tool. Always wear approved
safety goggles if work in dusty. This also applies to other persons in the nearby vicinity.
14. Do not wear loose clothing or jewelry. They can be caught in moving parts. Rubber gloves and non-skid foot wear are recommended
when working outdoors. Wear protective hair covering to contain long hair.
15. Keep proper footing and balance at all times.
16. Use clamps or a vice to hold work-piece. It is safer than using your hand and free both hands to operate the air tool.
17. When not use, before performing service or changing accessories, please disconnect tool from air compressor.
18. Do not carry plugged in air tool with your finger on the switch trigger. Be sure switch is in the “OFF” position when connecting to air
supply.
19. Watch what you are doing. Use common sense, even unsafe situation or unbalanced positions, particularly when you are tired.
20. Air powered tools can vibrate in use. Vibration, repetitive motions or uncomfortable positions may be harmful to your hands or arms.
Stop using any tool if discomfort, tingling feeling or pain occurs. Seek medical advice before resuming use.
21. Multiple hazards. Read and understand the safety instructions before installing, operating, repairing, maintaining, changing accessories
on, or working near the power tool. Failure to do so can result in serious bodily injury.
22. Only qualified and trained operators should install, adjust or use the power tool.
23. Do not modify this power tool. Modifications may reduce the effectiveness of safety measures and increase the risks to the operator.
24. Do not discard the safety instructions –give them to the operator.
25. Do not use the power tool if it has been damaged.
26. Tools shall be inspected periodically to verify the ratings and markings required by this document are legibly marked on the tool. The
employer/user shall contact the manufacturer to obtain replacement marking labels when necessary.
Safety precautions for projectile hazards
1. Disconnect the power tool from the energy source when changing inserted tool or accessories.
2. Failure of the work piece, or accessories, or even of the inserted tool itself may generate high velocity projectiles.
3. Always wear impact-resistant eye protection during operation of the tool. The grade of protection required should be assessed for each
use.
4. The risks to others should also be assessed at this time.
5. Ensure that the work piece is securely fixed.
6. Check that the protection against ejection of fastener and/or stem is in place and is operative.
7. Warn against the possible forcible ejection of installation mandrels from the front of the power tool.
Safety precautions for operating hazards
1. Use of the tool may expose the operator’s hands to hazards including crushing, impacts, cuts and abrasions and heat. Wear suitable
gloves to protect hands.
2. Operators and maintenance personnel must be physically able to handle the bulk, weight and power of the tool.
3. Hold the tool correctly: be ready to counteract normal or sudden movements –have both hands available.
4. Maintain a balanced body position and secure footing.
5. Release the start and stop device in the case of an interruption of the energy supply.
6. Use only lubricants recommended by the manufacturer.
7. That unsuitable postures may not allow counteracting of normal or unexpected movement of the tool.
8. If the power tool is fixed to suspension device make sure that the fixation is secure.
9. Risk of crushing if nose equipment is not fitted.

2
Safety precautions for repetitive motions hazards
1. When using a power tool, the operator may experience discomfort in the hands, arms, shoulders, neck, or other parts of the body.
2. While using a power tool, the operator should adopt a comfortable posture. Maintain secure footing and avoid awkward or off-balanced
postures. The operator should change the posture during extended tasks which may help avoid discomfort and fatigue.
3. If the operator experience symptoms such as persistent or recurring discomfort, pain, throbbing, aching, tingling, numbness, burning
sensation or stiffness, these warning signs should not be ignored. The operator should tell the employer and consult a qualified health
professional.
Safety precautions for accessory hazards
1. Disconnect power tool from energy supply before changing the inserted tool or accessory.
2. Only use sizes and types of accessories and consumables that are recommended by the power tool manufacturer.
Safety precautions for workplace hazards
1. 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.
2. Proceed with care in unfamiliar surroundings. Hidden hazards may exist, such as electricity or other utility lines.
3. This power tool is not intended for use in potentially explosive atmospheres and is not insulated from coming into contact with electric
power.
4. Make sure there are no electrical cables, gas pipes etc. that could cause a hazard if damaged by use of the tool.
Safety precautions for dust and fume hazards
1. Dusts and fumes generated when using power tools can cause ill health (for example: cancer, birth defects, asthma and/or dermatitis);
risk assessment of these hazards and implementation of appropriate controls of is essential.
2. Risk assessment should include dust created by the use of the tool and the potential for disturbing existing dust.
3. Operate and maintain the power tool as recommended in these instructions, to minimise dust or fume emissions.
4. Direct the exhaust so as to minimise disturbance of dust in a dust filled environment
5. Where dusts or fumes are created, the priority shall be to control them at the point of emission.
6. 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.
7. Use respiratory protection as instructed by your employer or as required by occupational health and safety regulations.
Safety precautions for noise hazards
1. Unprotected 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).
2. Risk assessment of these hazards and implementation of appropriate controls of is essential.
3. Appropriate controls to reduce the risk may include actions such as damping materials to prevent work pieces from ‘ringing’.
4. Use hearing protection as instructed by your employer or as required by occupational health and safety regulations.
5. Operate and maintain the power tool as recommended in these instructions, to prevent an unnecessary increase in noise.
6. If the tool has a silencer, always ensure it is in place and in good working order when the tool is operating.
7. Select, maintain and replace the consumable/inserted tool as recommended in these instructions, to prevent an unnecessary increase in
noise.
Safety precautions for vibration hazards
1. Exposure to vibration can cause disabling damage to the nerves and blood supply of the hands and arms.
2. Wear warm clothing when working in cold conditions and keep your hands warm and dry.
3. If you experience numbness, tingling, pain or whitening of the skin in your fingers or hands, stop using the assembly power tool for
non-threaded mechanical fasteners, tell your employer and consult a physician.
4. Support the weight of the tool in a stand, tensioner or balancer, because the operator can then use a lighter grip to support the tool.
Additional safety instructions for pneumatic power tools
1. 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.
2. Never direct air at yourself or anyone else.
3. Whipping hoses can cause severe injury. Always check for damaged or loose hoses and fittings.
4. Cold air shall be directed away from the hands.
5. 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 and hose-and-hose connection failure.
6. Do not exceed the maximum air pressure stated on the tool.
7. Never carry an air tool by the hose.
Specific safety instructions
Warnings shall be given about any specific or unusual hazards associated with the use of the power tool. Such warnings shall indicate the
nature of the hazard, the risk of injury and the avoidance action to take.

3
General preparation and connection:
1. Before connecting the air hose, apply 4 to 5 drops of SAE 10W-20 (ISO Viscosity Grade 46/32) Hydraulic Oil at the air inlet. Also, every
3 to 4 hours of operation, oiling is necessary. Twist Teflon thread tape to ensure a proper seal air inlet. Then tighten the air coupler into
air tool.
2. The supplied compressed air must be clean and dry, with the appropriate oil mist. Use an air treatment unit; filter, regulator and
lubricator.
3. Please refer Fig.1 illustration shows the correct mode of connection to the air supply system which will increase the efficiency and useful
life of the tool.
4. The quick connect coupling and hose must have sufficient air flow capacity. We recommend an air hose with a diameter of 10mm (3/8”).
5. To ensure a good performance. The operation pressure at the compressed air inlet should not exceed 6.3bar (90psi) (unless indicated
otherwise). Higher operating pressures may cause damaged or excessive wear. Operating pressures below 5.3bar may cause pressure
or power loss.
Risk of injury
1. Compressed air can inflict serious injuries. Therefore never point the air hose at another person or yourself.
2. Shut –off the air supply and disconnect the tool in case:
➢You want to change or replace accessories.
➢You want to clean, repair or maintain the tool.
➢The tool is not going to use for some times.
3. Check compressed air hose before use. If it is damaged, broken, torn, or deformed, the hose is not to be connected to the tool.
4. Always check the pneumatic couplings before using the tool. If they show signs of damage, fracture, cracking or excessive corrosion,
the respective tool or the air hose is not to be used.
5. Use only qualified adapters and connectors, In case of wear they are to be replaced immediately.
6. Only use air pipes that are fit for the use at maximum pressure.
Maintenance instruction:
1. Dry the filter (fig1) and the air inlet of the tool.
2. Lubricate the quick connect coupling to prevent blocking.
3. Air tool require lubrication throughout the life of the tool. The air motor and bearing uses compressed air to start the tool. The moisture in
compressed air will rust the air motor; you must lubricate the motor daily.
4. Avoid storing the tool in a location subject to high humidity. If the tool is left as it is used, the residual moisture inside the tool can cause
rust.
5. Before storage, lubricate tool and run it for a few seconds.
6. Regular inspection of spindles, threads, and clamping devices in respect of wear and tolerances for location of abrasive products.
7. If the tool is too seriously damage to be used anymore, recycle raw material instead of disposing as waste. The machine, accessories
and packaging should be sorted for environmental-friendly recycling. Check with your local authority or retailer for recycling advice.
8. Keep Safety Cap free of spent mandrels.
9. Insure that jaws are clean and free of metal shavings, dirt and oil.
10. Keep oil at optimum level. With use of tool there may be a gradual loss of oil. When you notice a reduction in the stroke, you need to
add a small amount of oil.
RIVETER-I-201212A