Tools / Power Tools
FEIN 18V MultiMaster Instruction Manual
Quick guide for the FEIN 18V MultiMaster, covering safety, battery handling, tool changes, and operating instructions for sanding, sawing, and scraping.
Table of contents
Quick guide from the manual
This manual provides essential safety and operating instructions for the FEIN 18V MultiMaster (AMM500 PLUS AS). It is a hand-guided oscillator designed for sanding, sawing, scraping, and cutting in weather-protected environments.
Device Description and Setup
The device uses the AMPShare battery system. To prepare for use, ensure the battery is charged and correctly inserted. The tool features a clamping lever for quick tool changes.
Operating Instructions
- Tool Change: Ensure the clamping lever is open before inserting or removing an application tool. Do not operate the tool with the clamping lever open.
- Switching On/Off: Use the switch to turn the tool on or off. A self-start prevention lock prevents the tool from starting automatically if the battery is inserted while the switch is in the 'on' position.
- Sanding: Press the tool briefly and firmly against a flat surface and switch it on to ensure good adhesion. Use the entire surface of the sanding plate.
- Sawing/Scraping: Select a high oscillation frequency for sawing and a moderate to high frequency for scraping.
Safety and Maintenance
Always wear personal protective equipment. Regularly clean ventilation slots with non-metallic tools to prevent dust accumulation. After working with gypsum-containing materials, clean the ventilation slots and switch element with dry, oil-free compressed air to prevent hardening of dust. Store the tool with the application tool removed and the clamping lever closed.
Battery Handling
Use only FEIN or AMPShare partner batteries and chargers. Protect batteries from heat, fire, water, and moisture. Do not use damaged batteries. If battery fluid leaks, avoid skin contact and clean the area thoroughly.
Environmental Protection
Do not dispose of batteries in household waste. Dispose of them in a discharged state at designated collection points.
Manufacturer information
C. & E. Fein GmbH
Practical help
Common problems
Tool does not start after battery insertion
Check if the switch is in the 'on' position; the self-start prevention lock may be active. Switch off, remove the battery, and reattach it.
Battery charge indicator does not light up
The battery may be defective and must be replaced.
Excessive dust accumulation inside the tool
Regularly clean ventilation slots with dry, oil-free compressed air, especially after working with gypsum or metal.
Before use
- Read the general safety instructions provided with the tool.
- Ensure the battery is fully charged before first use.
- Check that the application tool is correctly mounted and the clamping lever is closed.
- Wear appropriate personal protective equipment (eye, ear, and dust protection).
- Ensure the work area is well-ventilated.
Specs in practice
- Oscillation rate (11000–18500 rpm)
- The speed at which the tool oscillates; higher rates are generally for sawing and sanding, lower for scraping.
- Oscillation angle (2 x 1.7°)
- The range of movement of the tool head.
- Weight (1.3 kg)
- The weight of the tool without battery and application tool.
Model compatibility
- Compatible with all FEIN 18V AMPShare system products.
- Compatible with all 18V products from AMPShare partners.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.