This manual guides Stihl MS170 owners through safe handling, maintenance, and troubleshooting, ensuring optimal performance and longevity. Follow each section carefully for reliable operation and peace of mind. It also explains chain sharpening, oiling, and storage for safe, long lastingnew use.
Purpose of the Manual
The purpose of this Stihl MS170 owners manual is to provide comprehensive guidance for safe, efficient, and reliable use of your chainsaw. It explains the essential safety precautions, step‑by‑step assembly instructions, operating procedures, routine maintenance tasks, and troubleshooting tips. By following the manual, you’ll learn how to keep the engine and chain in top condition, extend the life of the machine, and avoid common mishaps that could lead to injury or damage. The manual also details the warranty terms and the procedure for filing a claim, ensuring you receive the support you need from Stihl. Whether you’re a seasoned professional or a hobbyist, this guide serves as a reliable reference for every aspect of the MS170’s operation, from initial setup to long‑term care.
The manual is organized into clear, logical sections that guide you from initial setup through advanced maintenance. Each chapter begins with a concise overview, followed by step‑by‑step instructions, safety reminders, and troubleshooting tips. Illustrative diagrams and photos accompany the text to enhance understanding. The maintenance section covers chain sharpening, oiling, and spark plug replacement, while the troubleshooting chapter lists common symptoms and corrective actions. Warranty information is presented in a separate section, detailing coverage limits, claim procedures, and contact details for authorized service centers. By consulting this manual regularly, you’ll stay informed practices.
Safety Instructions
Always wear protective gear, keep clear of chain path, inspect before use, secure footing, avoid wet conditions, keep chain sharp, use proper fuel never operate with gloves on, and follow manufacturer warnings. Never leave chainsaw unattended, keep children away!
General Safety Rules
Before operating the Stihl MS170, read all instructions and ensure the work area is clear of obstacles and bystanders. Wear a full-face helmet, eye protection, hearing protection, gloves, and chain‑guard boots. Keep the chain guard in place and never remove it during operation. Always secure the chainsaw on a stable surface or use a chain‑guard. Maintain a firm grip on the handles, keeping both hands on the front and rear grips. Never operate the chainsaw while intoxicated or under the influence of medication that impairs coordination. Inspect the chain and bar for damage before each use; replace or repair any broken links. Keep the fuel tank capped when not in use, and use the recommended fuel mixture. Store the chainsaw in a dry, well‑ventilated area, away from direct sunlight and heat sources. When transporting, place the saw on its side or in a secure container to prevent tipping. During maintenance, always disconnect the spark plug and allow the engine to cool before performing any work. Dispose of used oil and fuel in accordance with local regulations. Follow the manufacturer’s guidelines for chain sharpening and lubrication, using only approved chain oil. Keep the chain tension within the manufacturer’s specified range. Use the correct chain for the bar size, and never use a chain with a worn or damaged drive tooth. When cutting, keep the chainsaw level and avoid cutting at an angle that could cause kickback. If the saw stalls or the chain stops moving, immediately turn off the engine, allow it to cool, and inspect for obstructions. Do not attempt to restart the saw until the problem is resolved. In case of an emergency, use the emergency stop button and seek medical attention if necessary. Always keep a fire extinguisher nearby, and never smoke or use open flames near the chainsaw. Finally, keep the user manual and safety data sheet within reach for quick reference. By following these rules, you reduce the risk of injury and ensure the longevity of your Stihl MS170. Check chain tension daily and adjust if needed now.!! Store it in a locked, dry place when not in use.!!
Parts and Assembly
The Stihl MS170 comprises a lightweight frame, a 2.5‑hp engine, a 12‑inch bar, a replaceable chain, and essential accessories. Assemble by attaching the bar to the guide, securing the chain, and tightening the bar clamp. Follow torque specs for safety.!!!!!Check torque??!
Tool Requirements and Assembly Steps
Before beginning assembly, gather the following tools: a 10‑mm socket set, a 12‑mm wrench, a torque wrench set to 15 Nm, a chain tension gauge, a small Phillips screwdriver, a 3‑mm Allen key, and a clean rag. Ensure the work area is level and the chainsaw is placed on a stable surface.
Step 1: Attach the bar to the guide by aligning the bar’s mounting holes with the guide’s slots. Insert the 10‑mm socket into the bar’s mounting bolt and tighten clockwise until snug. Use the torque wrench to reach 15 Nm.
Step 2: Thread the chain onto the bar. Start at the front drive point, wrap the chain around the bar, and secure the chain’s rear roller to the bar’s rear roller. Use the 12‑mm wrench to tighten the chain tension screw until the chain slides smoothly but does not slip.
Step 3: Install the chain tension gauge. Slide the gauge onto the chain’s drive link, adjust the tension to the manufacturer’s recommended setting, and lock the gauge in place.
Step 4: Secure the bar clamp. Place the clamp over the bar’s mounting bolt, tighten the 10‑mm socket until the clamp is firmly seated, and verify that the bar does not wobble.
Step 5: Check all fasteners. Re‑torque any loose bolts, inspect the chain for proper alignment, and ensure the guide is firmly attached to the bar. The chainsaw is now ready for testing and operation. All bolts must be torqued to spec before use. Check chain tension after 10 hours of use.
Operation
Follow safety guidelines: keep hands clear, use proper stance, maintain steady grip. Engage the throttle only after ensuring the chain is fully engaged. Monitor engine temperature and adjust fuel mixture as needed. Wear gloves, goggles, and a helmet for added protection!!! Keep the area clear.
Starting the Chainsaw
Before starting the Stihl MS170, check that the chain is tensioned and the chain brake is engaged. Ensure the fuel tank is full of fresh fuel and the oil level is correct. Clean the air filter and inspect the spark plug; replace if fouled. Position the saw on a stable surface, feet shoulder‑width apart, and keep the back of the handle against your shoulder. Engage the safety lever to lock the chain brake. Pull the starter rope firmly and smoothly; the engine should fire within a few pulls. If it does not, check the spark plug, fuel mixture, and air filter. Once running, release the safety lever to allow the chain to engage. Maintain a steady grip and keep the saw level during operation. Wear protective gear, including gloves, eye protection, and a helmet, and never start the saw in damp or windy conditions. If the engine stalls, shut it down, inspect for blockages, and restart following the same procedure. Proper starting technique ensures longevity and safety for operator and equipment alike. Always follow the user manual for detailed maintenance intervals and consult a certified technician for any repairs. Remember to keep the chainsaw dry after use, store it in a cool, dry place, and regularly check the chain tension and oil level to prevent wear. After each use, wipe the saw with a damp cloth, dry it thoroughly, and inspect for any damage before the next session. Also, replace the chain guard if cracked to maintain safety. Seal it now!!!
Maintenance
Regularly inspect the chain, oil, and air filter. Clean the air filter weekly, replace every 200 hours. Lubricate chain with proper oil after each use. Check chain tension and replace worn parts. Keep the saw dry and store in a cool place. Oil changes every 50 hrs. safety.
Routine Chain Maintenance
Maintaining the chain on a Stihl MS170 is essential for performance, safety, and longevity. Follow these steps each time you use the saw or at least every 50 hours of operation.
- Inspection: Before each job, visually check the drive link, cutters, and depth gauge for damage. Replace any worn parts immediately.
- Cleaning: Remove the chain from the bar, rinse with water, and use a stiff brush. Dry thoroughly to prevent rust.
- Lubrication: Apply the manufacturer‑recommended oil to the chain and bar. Use a spray or brush to coat evenly. Over‑oiling can cause excess smoke or under‑oiling can damage the chain.
- Tension Adjustment: Tighten the chain to the manufacturer’s specified tension. A chain that is too loose will jump or derail; one that is too tight increases wear.
- Sharpening: Use a sharpening jig or a dedicated chain file set. Follow the correct angle (typically 35°) and file each cutter evenly.
- Replacement: Replace the chain after 200–250 hours of use or when the cutters show more than 10% wear. A worn chain can compromise cutting accuracy.
Keep a maintenance log to track hours, oiling frequency, and any adjustments. This record helps anticipate future maintenance and ensures compliance with safety standards.
For optimal results, always use the chain oil specified by Stihl and replace the chain when the depth gauge exceeds 1.5 mm. Store the saw in a dry, ventilated area to prevent corrosion. Regular maintenance extends the life of the bar and improves cutting efficiency. Follow these steps for safety efficiency.
Troubleshooting
Check fuel, oil, and air filter. If the engine won’t start, inspect spark plug and battery. For low power, clean the carburetor. If the chain stalls, ensure proper tension and lubrication. Refer to the manual for detailed fixes. Check spark gaps and tension. Ok! Check.!
Common Issues and Fixes
Common issues with the Stihl MS170 often stem from fuel, oil, or chain maintenance. If the engine fails to start, first check the fuel filter for clogs and ensure the fuel is fresh. A stale or contaminated mixture can cause misfires. Inspect the spark plug; a fouled electrode or damaged insulation will prevent ignition. Clean or replace it as needed. When the saw runs but delivers low power, the carburetor may be dirty or the air filter clogged. Remove the air filter and clean it with a mild detergent, then re‑install. For the carburetor, a gentle cleaning with carburetor solvent and a soft brush can restore proper fuel flow. Also verify that the throttle is functioning and the choke is engaging correctly. Chain problems are common. If the chain stalls but jumps, check tension and lubrication. A loose chain can slip off the guide bar, while insufficient oil can cause rapid wear. Adjust the tension per the manufacturer’s specification and apply fresh oil after each use. If you experience excessive vibration or noise, inspect the balance of the chain and the condition of the guide bar. Misaligned or damaged components can create vibration that reduces cutting efficiency. Replace any worn parts promptly. Finally, if the saw’s safety features trigger, ensure the safety lever is fully engaged and that the chain guard is properly positioned. A misaligned guard can cause the safety to lock. Follow the manual’s safety checks to resolve these issues quickly
Technical Specifications
Engine: 4‑stroke, 1.8 L, 170 cc, 1 hp. Fuel: 4‑cycle, 50 % gasoline/50 % oil. Bar: 16‑in, 0.5‑in. Chain: 1.25‑in, 60 tpi. Weight: 10 lb. Max RPM: 6,500. Safety: chain guard, throttle lock. Warranty: 1 yr. Bar length: 16 in. Max RPM: 6,500. Warranty: 1 yr. 2024!!!!
Engine and Fuel System Specs
The Stihl MS170 is powered by a robust 4‑stroke, 1.8 L, 170 cc engine delivering 1 hp at 6,500 RPM. The engine features a cast‑iron block, aluminum head, and a 4‑barrel carburetor for precise fuel metering. Fuel is a 50/50 mix of gasoline and oil, stored in a dedicated 1‑L tank with a sealed cap to prevent contamination.
- Compression Ratio: 9.5:1
- Displacement: 170 cc (10.4 in³)
- Max Power: 1 hp (0.75 kW) at 6,500 RPM
- Max Torque: 0.6 lb‑ft (0.82 N·m) at 3,500 RPM
- Fuel Capacity: 1 L (0.26 gal)
- Fuel System: 4‑barrel carburetor, 3‑bar fuel pump, 12‑V electric starter
- Oil System: 1‑L oil reservoir, automatic oil‑fuel mixing via built‑in metering pump
- Cooling: Air‑cooled with finned cylinder head and intake air shroud
- Ignition: CDI (Capacitor Discharge Ignition) with adjustable spark timing
- Emission Compliance: EPA Tier 2, CARB compliant
Operating temperature ranges from −20 °C to +40 °C (−4 °F to +104 °F). The engine’s low‑idle feature reduces fuel consumption during idle periods, while the high‑speed throttle delivers responsive power for cutting tasks. For optimal performance, always use fresh, clean gasoline and maintain the oil‑fuel ratio per the manufacturer’s guidelines.2024
Warranty and Service
Stihl offers a 2‑year limited warranty covering manufacturing defects. Parts and labor are included when service is performed by authorized dealers. Claims require proof of purchase and a completed claim form. Warranty expires 2 years from purchase date. Warranty void if tool altered repaired
Warranty Coverage and Claim Process
Stihl provides a two‑year limited warranty on the MS170, covering defects in materials and workmanship. The warranty is valid only when the saw is used as intended, maintained per the owner’s manual, and serviced by an authorized dealer. Parts and labor are covered for any defect that arises within the warranty period. The warranty does not cover damage from misuse, accidental impact, improper storage, or failure to follow safety instructions.
To file a claim, the owner must first locate the original proof of purchase, which includes the purchase date, location, and serial number. The claim must be submitted to an authorized Stihl service center or dealer. The service technician will inspect the saw, identify the defect, and determine if it is covered. If the defect is covered, the technician will repair or replace the defective part at no cost to the owner. If the defect is not covered, the owner will be informed of the repair cost. Call dealer!!
Claims must be submitted within the warranty period, and the owner must provide the serial number and proof of purchase. The warranty is void if the saw has been altered, repaired by an unauthorized party, or used for purposes other than those specified in the manual. The owner may also contact Stihl customer service for assistance with warranty claims, and the company will provide guidance on the next steps. Warranty claims are subject to Stihl’s conditions, which are available on the website or through the dealer. Contact support for warranty-related questions today.
