GYS Belt Sander (ST-7710)

General Instructions

Read and understand these instructions carefully before operating the equipment. Do not perform any modifications or maintenance not specified in this manual.

The manufacturer is not liable for any personal injury or material damage resulting from non-compliance with the instructions in this manual. In case of problems or uncertainties, consult a qualified person for proper installation and operation.

Potential Risks from Power Supply and Connections

• Pressurized air can cause serious damage.
• Always shut off the air supply and disconnect the tool from the network before replacing accessories, repairing it, or when it is not in use.
• Do not direct the air jet at other persons or yourself; always use the tool at a safe distance from people near the work area.
• Hose whip can cause serious damage; carefully check hoses and connections for air leaks or breaks.
• Do not use quick-release connectors on the tool, as they can increase its weight and loosen due to vibration.
• Read the instructions for correct assembly.
• Do not exceed the maximum air pressure limit of 6-7 bar or the value indicated on the pneumatic tool's plate.
• Handle hoses and connectors with care. Do not transport the tool by grasping the hose. Do not pull forcefully to disconnect it from the air supply. Keep hoses away from heat sources, lubricants, and sharp edges.
• Check hoses for wear before each use. Ensure all connections are secure.

Risks Caused by Fragments

• Always use eye and face protection when using the tool.
• Even the smallest fragments can cause eye damage and blindness.
• The explosion of pneumatic tools can cause serious damage.

How to Avoid the Risk of Being Entangled

• Maintain a suitable distance from drills, blades, moving tools, etc.
• Do not wear loose clothing or jewelry, and avoid long hair.

Risks Caused by Operation

• Wear protective gloves for your hands.
• Do not modify the tool or its accessories.
• Operators and maintenance personnel must be physically capable of managing the tool's power and performing the necessary operations.
• Do not force the tool; using it at its designed speed will result in better and more reliable performance.
• Correct belt mounting is necessary to prevent injuries from belt loosening.
• Do not use chipped or cracked abrasive belts.
• Use only belts that fit the machine easily. If more force than usual is needed to install the belt, the size may be different from the required one.
• Before sanding, test the belt by briefly running the tool at full speed. Ensure a barrier (e.g., under a heavy workbench) is used to stop loose belts.
• A cracked sanding belt can cause serious injuries!
• Regularly check the tool's speed with a tachometer to ensure it has not been exceeded and is compatible with the abrasive belts being used. The appropriate speed is indicated on the data sheet provided with the belts.
• Never use a belt whose rated speed is lower than that of this tool!
• Use only abrasive belts with the appropriate diameter, dimensions, and speed, in accordance with the tool's technical specifications.
• This tool was developed as a belt sander and should only be used for this function. Any misuse can lead to serious health problems.

Dangers Caused by Working Conditions

• Slips, trips, and falls are the primary causes of accidents.
• High noise levels can cause permanent hearing damage. Employers and occupational safety organizations recommend the use of hearing protection.
• Maintain your body in balance and firmly on your feet. Repetitive work movements, unusual positions, and exposure to vibration can be harmful to your hands and arms. In case of numbness, tingling, pain, or paleness, stop using the tool and consult a doctor.
• This tool is not suitable for use in potentially explosive environments.

Safety Standards for Tool Use

• Handle the belt sander carefully to ensure long-lasting performance.
• Wear eye and ear protection, a half-mask, and protective gloves when using the tool.
• Use the sander in ventilated areas.
• Do not use the tool in explosion-risk areas and use it away from combustible materials; contact with metals can produce sparks.
• Do not grasp the device by the hose.
• Abrasives heat up during use. Allow them to cool before handling. Disconnect the air hose when changing or adjusting abrasives.
• Do not leave the pneumatic tool running while transporting it.
• Immediately switch off the unit if it jams or twists. Disconnect the air supply and do not turn it back on until the problem is resolved. Understand the reason for the blockage and ensure it does not happen again.
• Ensure the accessory you intend to use is not damaged. Exchange the part if you are unsure.
• If the pneumatic tool emits strong vibrations, replace the accessory/abrasive product, as it is likely damaged or worn.

Storage

• Avoid storing the tool in areas exposed to high humidity. Residual moisture inside the tool can cause rust.
• Before storing and after use, apply a little oil to the tool's air inlet and run it briefly.

Installation - Product Operation

Applications

• Finishing of trolleys and metal products.
• Automotive body finish.
• Welded surface finish.
• Finishing before painting.
• Finishing of cabinets and steel furniture.

Start-up

The compressed air network must be perfectly purged and adapted to the tool's consumption. A pressure-reducer and lubricator filter (except for tools supplied without lubrication) of appropriate size must be installed at a maximum distance of 10 meters from the tool. Its regulation pressure must be set at 7.5 bar, and the special oil flow rate for tools requiring lubrication should be approximately 1 drop of oil every 30 seconds for an air flow rate of 100 liters/mm. Note: your tool's air consumption must be higher than your lubricator's minimum priming rate. A shut-off valve must be installed upstream.

The connection between this filter-regulator-lubricator unit and the tool is made with a special "compressed air" hose made of rubber or PVC, with a maximum length of 10 meters and a minimum internal diameter of 8 mm for tools with a 1/4" supply connection, and 12 mm for 3/8" connections. It must be equipped with an automatic or semi-automatic quick-disconnect coupling near the tool for easy disconnection.

Use

• Use only accessories in perfect condition that match the tool's specifications.
• Avoid running the tool empty. If it runs empty after a long period of use, ensure no accessories are attached to the tool. It is essential to disconnect the tool for accessory installation. Check that accessories are perfectly secured before connecting the tool.
• Regularly inspect the condition of the supply piping. In case of damage or leaks, proceed to immediate repair. A broken pipe can cause serious injury. Periodically check lubricator levels, filter purging, and piping.

Maintenance

• At the beginning of the day and before a long shutdown period, introduce a few drops of special oil directly into the intake port. Do not use flammable liquids like gasoline or diesel.
• Regularly check the condition of the regulating filter and the oil level in the air system lubricator.
• Ensure that supply connections, piping, and accessories are in perfect condition. Regularly drain compressor pipes and tanks. Do not forget inspection deadlines.
• Only original parts available from the supplier may be used for tool maintenance.
• GYS cannot be held responsible for modifications made to the tools or for failure to comply with general safety rules regarding the use of compressed air.

Air Supply Diagram Description

The diagram illustrates the compressed air supply system. It shows a compressor connected via a hose (up to 10 meters) to a filter-regulator-lubricator unit. This unit includes a filter, regulator, and lubricator, with a drain valve. A quick-disconnect coupling is shown at the end of the hose, connecting to the tool.

Replace the Belt

Disconnect the compressed air supply from the sander before changing the belt.

1. Press the side button and slightly press the end of the sander to reduce belt tension. Remove the damaged belt and replace it with a new one. The available belt grits are: Grain 60 (x5): ref. 060913, Grain 80 (x5): ref. 060920, Grain 100 (x5): ref. 060937.
2. Press the button on the side of the belt holder to pull and extend the tension bar forward to tighten the belt.
3. Use a hexagonal wrench to unscrew the screw located under the sander to loosen the pin and rotate the head 360°.
4. If the belt is not centered on the support, turn screw 4 with a hexagonal wrench to adjust it.

Warranty Conditions (France)

The warranty covers manufacturing defects for 2 years from the date of purchase (parts and labor). The warranty does not cover:

• Damage due to transport.
• Normal wear and tear of parts.
• Incidents due to misuse (incorrect power supply, drops, disassembly).
• Failures related to the environment (pollution, rust, dust).

In case of failure, return the unit to your distributor with:

• Proof of purchase (dated receipt, invoice...).
• A description of the fault.

Technical Specifications

Icons and Symbols

• [Info Icon]: Indicates important information. Please read the user manual before use.
• [Warning Icon]: Indicates a potential hazard. Follow safety instructions carefully.
• CE Mark: Indicates compliance with European directives.
• UK CA Mark: Indicates compliance with British requirements.
• WEEE Symbol (crossed-out bin): Indicates that the equipment is subject to selective waste collection according to European directives. Do not dispose of with domestic waste.
• Recycling Symbol: Indicates the product is recyclable and should be disposed of according to specific regulations.
• Safety Glasses Required: Mandatory use of protective eyewear.
• Hearing Protection Required: Mandatory use of hearing protection when noise levels are high.
• Gloves Required: Use of protective gloves is recommended or required for certain operations.

Declaration of Conformity

GYS certifies that the new and unused product, "SANDER BELT, Model: ST-7710", conforms to Directive 2006/42/EC and harmonized standards such as EN ISO 12100:2010 and EN ISO 11148-8:2011.

This declaration is made by GYS, located at 1, rue de la Croix des Landes, CS 54159, 53941 SAINT-BERTHEVIN Cedex, FRANCE, on 14/02/2025, signed by Bruno BOUYGUES, General Director.