Stihl 400 Concrete Saw Manual

The Stihl 400 Concrete Saw is a professional-grade, high-performance power tool designed for cutting concrete, asphalt, masonry, and other hard materials. It features a powerful gasoline engine, diamond cutting blades, water feed system for dust suppression, ergonomic handles, safety features including a blade guard and throttle lock, and is built for durability on demanding job sites. Below are key sections for safety, features, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: High-torque 2-stroke engine, Diamond cutting blade, Blade guard, Water connection port, Throttle lever with lockout, Ergonomic front and rear handles, Anti-vibration system.

Safety Instructions

Read and understand all instructions before use. Always wear appropriate PPE.

1. Personal Protective Equipment (PPE): Wear safety glasses, hearing protection, gloves, dust mask, and steel-toe boots.
2. Work Area Safety: Ensure stable footing, clear area of tripping hazards, and keep bystanders away.
3. Tool Inspection: Check for damage before each use; do not operate if damaged.
4. Blade Safety: Ensure blade guard is in place and blade is sharp, undamaged, and properly installed.
5. Kickback Awareness: Be aware of potential kickback; always hold saw firmly with both hands.

WARNING! Gasoline is flammable. Refuel in well-ventilated area with engine off and cool. No smoking.

Assembly & Setup

Unpack all components. Assemble on a clean, flat surface.

1. Attach Handle: Secure front and rear handles using provided bolts and wrench.
2. Install Blade: Ensure engine is off. Remove blade guard bolt, place blade on spindle, reinstall bolt and tighten securely with wrench.
3. Attach Blade Guard: Position guard over blade and secure with fasteners.
4. Connect Water Hose: Attach garden hose to water inlet port; ensure connection is tight to prevent leaks.
5. Fuel Mix: Prepare correct gasoline/oil mixture as specified in manual. Fill fuel tank.

CAUTION! Blade is sharp. Wear cut-resistant gloves during installation.

Specifications

• Engine Type: 2-stroke, air-cooled gasoline engine.
• Displacement: XX cc (refer to specific model plate).
• Power Output: High torque for concrete cutting.
• Blade Diameter: Compatible with XX-inch diamond blades.
• Max Cutting Depth: Adjustable up to XX inches.
• Fuel Tank Capacity: XX liters.
• Weight: Approximately XX lbs (without blade).
• Sound Power Level: Wear hearing protection as noise exceeds XX dB(A).
• Vibration Level: Reduced by anti-vibration handle system.

Controls and Components

Familiarize yourself with all controls before starting the engine.

Main Controls: Throttle Lever (with lockout), Stop Switch (ON/OFF), Choke Lever (for cold starts), Starter Grip, Depth Adjustment Knob/Lever.

Components: Engine Housing, Blade Spindle, Blade Guard, Water Inlet, Fuel Tank Cap, Air Filter Cover, Muffler, Cutting Guide Notch.

Operation: Engage throttle lockout before squeezing throttle. Use choke for cold starts. Adjust cutting depth before beginning cut.

Operation Guide

Starting, running, and stopping the concrete saw.

1. Pre-Start Check: Verify fuel, blade tightness, guard security, and water connection.
2. Starting (Cold): Set stop switch to ON. Engage choke. Pull starter cord briskly until engine fires. Disengage choke. Pull again to start.
3. Starting (Warm): Choke not needed. Pull starter cord.
4. Running: Allow engine to warm up at idle. Squeeze throttle to increase RPM for cutting.
5. Stopping: Release throttle, allow engine to idle briefly, set stop switch to OFF.

Tip: Always let the saw reach full operating speed before beginning a cut.

Cutting Techniques

For straight, plunge, and bevel cuts in concrete.

1. Mark Cut Line: Use chalk line or marker on work surface.
2. Set Depth: Adjust depth knob to desired cutting depth (not exceeding blade radius).
3. Position Saw: Align cutting guide with mark. Hold saw firmly with both hands.
4. Start Cut: Start engine, bring to full speed. Lower blade gently into material at start of line.
5. Guide Saw: Move saw forward steadily along line. Let blade do the work; do not force.
6. Plunge Cuts: For interior cuts, tilt saw forward, lower blade into material at an angle until full depth, then straighten.
7. Water Use: Ensure water is flowing over blade throughout cut to control dust and prolong blade life.

WARNING! Never cut without water dust suppression unless using a specialized vacuum system. Avoid twisting blade in cut.

Maintenance Schedule

Regular maintenance ensures performance and longevity.

CAUTION! Perform maintenance only when engine is off and cool. Disconnect spark plug wire for safety.

Storage & Transport

Store and transport saw safely to prevent damage and accidents.

1. Cleaning: Clean saw thoroughly of concrete slurry and dirt.
2. Fuel: For long-term storage, run engine until fuel tank is empty OR add fuel stabilizer to full tank and run for 2 minutes.
3. Blade: Remove, clean, and store separately in a safe place.
4. Location: Store in a dry, locked place out of reach of children.
5. Transport: Secure saw in vehicle to prevent movement. Use blade guard or a separate blade case.

Warranty Information

Stihl 400 Concrete Saw includes a limited warranty against defects in materials and workmanship for a specified period from date of retail purchase. Warranty is valid only for the original purchaser with proof of purchase from an authorized Stihl dealer. Warranty does not cover damage from misuse, neglect, improper maintenance, normal wear, or use of non-Stihl parts. For warranty service, contact the authorized Stihl dealer where the product was purchased. For product support and dealer locator, visit www.stihlusa.com or contact Stihl Incorporated at 1-800-467-8445.

Troubleshooting

Service: For repairs beyond basic maintenance, contact an authorized Stihl service dealer.

Support: 1-800-467-8445; www.stihlusa.com