Baumr AG SX25 Chainsaw Manual

The Baumr AG SX25 is a 25cc 2-stroke petrol chainsaw designed for domestic cutting and pruning tasks. It features a lightweight design, automatic chain oiler, anti-vibration system, safety throttle lock, chain brake, and easy-start mechanism. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 25cc 2-stroke engine, 16" Oregon bar and chain, automatic chain oiler, anti-vibration handles, safety throttle lock, chain brake, side-access chain tensioner, translucent fuel tank.

Safety Instructions

Read all instructions before use. Always wear protective equipment.

1. Personal Protective Equipment: Wear safety glasses, hearing protection, gloves, chainsaw chaps, and steel-toe boots.
2. Work Area Safety: Clear area of bystanders, especially children. Ensure secure footing.
3. Fuel Safety: Refuel in well-ventilated area with engine off and cool. Use fresh fuel mix.
4. Kickback Awareness: Be aware of kickback zone (upper quadrant of bar tip).
5. Never operate above shoulder height or on a ladder.

WARNING! Chainsaws are dangerous. Failure to follow safety instructions can result in serious injury or death.

Assembly & Preparation

Unpack and inspect all parts. Assembly requires attaching bar and chain, filling fluids.

1. Attach Handle: Secure rear handle with provided bolts if not pre-assembled.
2. Install Bar & Chain: Place bar over studs, loop chain around sprocket and bar with cutting teeth facing forward. Adjust tension.
3. Fuel Mix: Use fresh unleaded petrol (min 90 octane) mixed with 2-stroke oil at 25:1 ratio (40ml oil per 1L petrol).
4. Fill Tanks: Add fuel mix to fuel tank. Add bar and chain oil to oil tank.
5. Check Chain Tension: Chain should be snug but pull freely around bar.

CAUTION! Ensure chain brake is engaged during assembly. Wear gloves when handling chain.

Specifications

• Model: Baumr AG SX25
• Engine Displacement: 25cc
• Engine Type: 2-stroke, air-cooled
• Power Output: 0.9kW (1.2HP)
• Fuel/Oil Ratio: 25:1 (unleaded petrol to 2-stroke oil)
• Bar Length: 16" (40cm)
• Chain Speed: Approx. 18 m/s
• Sound Pressure Level: 108 dB(A)
• Vibration Level: 4.2 m/s² (front handle), 5.1 m/s² (rear handle)
• Weight: 4.8kg (dry)

Controls and Components

Main components: Front handle with hand guard, rear handle with throttle trigger, choke lever, stop switch, chain brake lever, side-access chain tensioner, fuel cap, oil cap.

Controls: Throttle trigger (with safety lock), choke lever (positions: RUN, START, CHOKE), stop switch (O=OFF, I=ON), chain brake lever (forward=engaged, backward=disengaged), primer bulb, decompression valve (if equipped).

Chain tensioning: Use combination wrench to loosen bar nuts, adjust tension screw, retighten nuts.

Starting & Stopping

Starting procedure for cold and warm engine.

1. Pre-Start Check: Ensure chain brake is engaged. Clear area. Check fuel and oil.
2. Cold Start: Set choke to CHOKE. Press primer bulb 5-6 times. Pull starter cord sharply until engine fires. Move choke to START. Pull starter again to start. Allow to idle briefly.
3. Warm Start: Choke in RUN position. Pull starter cord.
4. Stopping: Release throttle, allow to idle briefly. Press stop switch to OFF.

Tip: Never drop-start or start with chain brake disengaged.

Operating Instructions

Proper cutting techniques for safety and efficiency.

1. Grip: Hold firmly with both hands, right on rear handle, left on front handle.
2. Stance: Stand with feet shoulder-width apart, left foot slightly forward.
3. Basic Cuts: Use lower part of bar for cutting. Let chain do the work; don't force.
4. Kickback Prevention: Avoid contact with bar tip. Be aware of pinch points.
5. Chain Oiling: Automatic oiler works when engine runs. Check oil flow regularly.
6. After Use: Allow engine to cool before storage.

WARNING! Always disengage chain brake before cutting. Watch for falling branches.

Maintenance & Cleaning

Regular maintenance ensures longevity and safety.

• Daily: Clean air filter, check chain tension and sharpness, clean saw of debris.
• Weekly: Clean spark arrestor screen, check all bolts and fasteners.
• Monthly: Clean cooling fins, check fuel filter, replace spark plug if needed.
• Chain Oiler: Test by running at full throttle against light-colored surface; look for oil line.

CAUTION! Always disconnect spark plug wire before performing maintenance.

Chain Sharpening & Replacement

Sharp chain is essential for safe operation.

1. Sharpening: Use round file matching chain pitch (5/32" for 3/8" pitch). File at 30° angle. File all cutters to equal length.
2. Depth Gauges: Use flat file to lower depth gauges after several sharpenings.
3. Replacement: Replace chain when cutters are worn below 4mm, or if damaged.
4. Bar Maintenance: Clean bar groove regularly. Flip bar monthly for even wear.

Note: Dull chain causes kickback and excessive wear.

Storage

Proper storage prevents fuel system issues.

1. Short-term (under 30 days): Drain fuel tank, run engine until it stops to clear carburetor.
2. Long-term: Drain all fuel. Remove spark plug, add teaspoon of oil to cylinder, pull starter slowly to coat. Store in dry place.
3. Chain: Remove, clean, and soak in oil before storage.

WARNING! Never store with fuel in tank for extended periods.

Troubleshooting

Service: For technical support, contact Baumr AG customer service or authorized dealer.