1. Introduction
Figure 1: 3M Non-Vacuum Random Orbital Sander 20325.
The 3M Non-Vacuum Random Orbital Sander 20325 is an air-powered tool designed for professional performance and a swirl-free finish in high-production industrial environments where dust extraction is not required. This sander is engineered to reduce vibration and noise, enhancing operator comfort and control. It is optimized for use with 3M abrasives and features a low-profile, balanced design.
This manual provides essential information for the safe and effective operation, setup, and maintenance of your 3M Random Orbital Sander 20325.
2. Safety Information
WARNING: For industrial/occupational use only. Not for consumer sale or use. Misuse of 3M industrial and occupational products may result in injury, sickness, death, or property damage.
- Always wear appropriate personal protective equipment (PPE), including eye protection, hearing protection, and respiratory protection, when operating the sander.
- Ensure the work area is well-ventilated and free from flammable materials.
- Disconnect the air supply before changing accessories, performing maintenance, or when the tool is not in use.
- Do not operate the tool if it is damaged or malfunctioning.
- Keep hands and loose clothing away from moving parts.
- Read and understand all instructions and warnings in this manual before operating the tool.
3. What's in the Box
Upon unpacking, verify that all items listed below are present:
- 3M Random Orbital Sander 20325 Pneumatic Non-Vacuum Tool
- 3M Stikit Disc Pad 20354
- Sample of 3M Air Tool Lubricant
- 24 mm Pad Wrench 28108
- Instruction Manual (this document)
4. Setup
4.1 Air Supply Requirements
This tool is air-powered and requires a clean, lubricated air supply. Ensure your air compressor meets the following specifications:
- Airflow Rate: 17 standard cubic feet per minute (SCFM) or 481 liters per minute (LPM) at the tool.
- Air Pressure: 90 pounds per square inch (psi) at the tool when running with the lever fully depressed.
- Airline: An approved 3/8 inch (10 mm) airline is recommended. Use the minimum length required for the application, with a maximum length of 25 feet (8 m).
4.2 Attaching the Disc Pad
- Ensure the air supply is disconnected from the sander.
- Align the 3M Stikit Disc Pad 20354 with the sander's base.
- Securely attach the disc pad using the provided 24 mm Pad Wrench 28108. The disc pad reduces vibrations and ensures reliable disc adhesion.
Figure 2: Sander with Stikit Disc Pad attached, showing durable construction.
4.3 Attaching Abrasive Discs
The 3M Stikit Disc Pad is designed for use with adhesive-backed sanding discs. Simply peel the backing from the abrasive disc and firmly press it onto the disc pad, ensuring proper alignment.
5. Operating Instructions
5.1 General Operation
- Connect the sander to the air supply.
- Hold the sander firmly with both hands, ensuring a comfortable grip.
- Place the abrasive disc flat against the workpiece surface.
- Depress the lever to start the sander. The tool operates at a maximum RPM of 12,000 at 90 psi.
- Move the sander in overlapping patterns across the surface to achieve an even finish. The random orbital action helps prevent swirl marks.
- Release the lever to stop the sander.
- Disconnect the air supply when finished or when leaving the tool unattended.
Figure 3: Sander in operation, designed for a swirl-free finish.
Figure 4: Proper handling of the sander during use.
5.2 Key Features for Performance
- Powerful Motor: The 0.28 hp motor provides ample power for various sanding and finishing applications.
- Smooth Operation: A precision-balanced motor ensures smooth operation, contributing to greater comfort and control.
- Random Orbital Action: The 3/16" diameter orbit rotates the abrasive disc in two simultaneous overlapping oval patterns, preventing single abrasive particles from following the same path twice. This produces a random scratch pattern and a swirl-free finish suitable for paint or varnish.
- Ergonomic Design: The low-profile, balanced design, comfortable rubber grip, and recessed lever platform are engineered to optimize ergonomics and reduce operator fatigue.
Figure 5: Key design features of the sander.
6. Maintenance
Regular maintenance ensures optimal performance and extends the lifespan of your sander.
- Lubrication: Use the provided 3M Air Tool Lubricant as directed in the full instruction manual (if available) or according to standard pneumatic tool lubrication practices. Proper lubrication is crucial for the internal components.
- Cleaning: Keep the tool clean and free of debris. Wipe down the exterior with a clean, dry cloth. Do not use harsh solvents.
- Disc Pad Inspection: Regularly inspect the disc pad for wear or damage. Replace worn pads to maintain optimal sanding performance and disc adhesion.
- Air Line Inspection: Periodically check the air line for leaks, kinks, or damage. Ensure all connections are secure.
- Storage: Store the sander in a clean, dry environment when not in use.
7. Troubleshooting
This section addresses common issues you might encounter with your 3M Random Orbital Sander 20325.
| Problem | Possible Cause | Solution |
|---|---|---|
| Sander does not start or runs slowly. | Insufficient air pressure or flow; clogged air inlet; lack of lubrication. | Check air compressor settings and air line for obstructions. Ensure 90 psi at the tool. Apply air tool lubricant. |
| Excessive vibration or noise. | Worn or damaged disc pad; unbalanced abrasive disc; internal component wear. | Inspect and replace disc pad if necessary. Ensure abrasive disc is properly centered. If problem persists, contact service. |
| Poor sanding performance or swirl marks. | Worn abrasive disc; incorrect grit for application; worn disc pad; improper technique. | Replace abrasive disc. Use appropriate grit. Inspect and replace disc pad. Ensure even pressure and overlapping passes. |
For issues not covered here, or if solutions do not resolve the problem, contact 3M customer support or a qualified service technician.
8. Specifications
| Feature | Specification |
|---|---|
| Model Number | 20325 |
| Sander Type | Non-Vacuum Random Orbital Sander |
| Disc Diameter | 6 inches |
| Orbit Diameter | 3/16 inches |
| Power Source | Air-Powered |
| Motor Horsepower | 0.28 hp |
| Maximum RPM | 12,000 RPM at 90 psi |
| Air Pressure Requirement | 90 psi (at tool) |
| Air Flow Rate | 17 SCFM (481 LPM) |
| Product Dimensions | 9.6 x 6.9 x 3.9 inches |
| Item Weight | 2.2 Pounds |
| Included Disc Pad | 3M Stikit Low Profile Disc Pad 20354 |
9. Warranty and Support
For information regarding product warranty, service, or technical support, please refer to the official 3M website or contact 3M customer service directly. Keep your purchase receipt as proof of purchase.
For additional product information, visit www.3M.com.