stihl 026 repair manual download

The STIHL 026 is a professional-grade chainsaw known for its reliability and power. This repair manual provides comprehensive instructions for maintenance, troubleshooting, and repair of the STIHL 026 model. It covers engine disassembly and reassembly, fuel system servicing, ignition system checks, chain and bar maintenance, carburetor adjustment, and safety procedures. Below are key sections for safety, specifications, maintenance schedules, troubleshooting, and repair procedures.

1. Features and Specifications 2. Safety Precautions 3. Maintenance Schedule 4. Engine Repair 5. Fuel System 6. Ignition System 7. Chain and Guide Bar 8. Carburetor Adjustment 9. Troubleshooting Guide 10. Parts List and Diagrams 11. Warranty and Support

Features and Specifications

Key components: Engine, fuel tank, chain brake, guide bar, chain, air filter, spark plug.

Feature	Description
Engine Type	2-stroke, single cylinder, air-cooled
Displacement	50.2 cc (3.06 cu. in.)
Power Output	2.6 kW (3.5 hp)
Fuel Tank Capacity	0.55 L (18.6 fl. oz.)
Oil Tank Capacity	0.26 L (8.8 fl. oz.)
Guide Bar Lengths	40 cm (16") to 50 cm (20")
Chain Pitch	3/8" PMM or .325"
Weight (without cutting equipment)	5.2 kg (11.5 lbs)
Ignition System	Electronic, capacitor discharge
Spark Plug	Bosch WSR 6 F or equivalent

Safety Precautions

Always wear protective gear and follow safety guidelines.

Personal Protective Equipment (PPE): Wear safety glasses, hearing protection, gloves, chainsaw chaps, and steel-toed boots.
Work Area Safety: Clear area of obstacles and ensure secure footing.
Chain Brake: Test chain brake before each use.
Fuel Safety: Refuel in well-ventilated area, away from ignition sources.
Transport: Engage chain brake and use scabbard when carrying.

WARNING! Never operate a chainsaw without proper training. Disconnect spark plug before performing any repairs.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Before Each Use: Check chain tension, sharpness, and lubrication. Inspect for loose fasteners.
After Each Use: Clean air filter, check spark plug, clean exterior.
Weekly: Clean cooling fins, check fuel filter, inspect anti-vibration elements.
Monthly: Check clutch, sprocket, and guide bar for wear.
Annually: Replace fuel lines, inspect ignition module, decarbonize exhaust.

CAUTION! Use only STIHL-approved parts and lubricants.

Engine Repair

Cylinder and Piston: Inspect for scoring; replace if wear exceeds limits.
Crankshaft and Bearings: Check for play; replace bearings if noisy or loose.
Engine Seals: Replace if leaking to prevent air leaks.
Decompression Valve: Clean and test for proper operation.
Muffler: Remove and clean spark arrestor screen regularly.
Torque Specifications: Cylinder head nuts: 20 Nm (14.8 ft-lb). Spark plug: 25 Nm (18.4 ft-lb).

Fuel System

Components: Fuel tank, filter, lines, carburetor, primer bulb.

Fuel Mix: Use high-quality 2-stroke oil mixed at 50:1 ratio (2% oil). Use 89 octane or higher gasoline.

Fuel Filter Replacement: Disconnect fuel line, remove old filter, install new filter. Fuel Lines: Inspect for cracks; replace if hardened or leaking. Carburetor: Clean jets and passages; rebuild kit available. Primer Bulb: Test for cracks; replace if not priming.

Ignition System

Spark Plug: Gap to 0.5 mm (0.020"). Replace if electrode worn. Ignition Module: Test with multimeter; resistance primary: 0.8-1.2 Ω, secondary: 12-16 kΩ. Stop Switch: Test for continuity when pressed. Flywheel: Check key and keyway for damage; torque nut to 40 Nm (29.5 ft-lb).

Remove spark plug and connect to ignition wire.
Ground plug against cylinder and pull starter; look for spark.
If no spark, check stop switch, module, and wiring.

Tip: Keep ignition components clean and dry.

Chain and Guide Bar

Chain Tension: Adjust so chain snaps back when pulled from guide bar. Sharpening: Use round file matching chain pitch; maintain 30° cutting angle. Guide Bar: Flip weekly for even wear; clean groove and oil holes. Sprocket: Replace if worn (teardrop shape). Chain Brake: Test by striking handle forward; replace band if stretched or damaged.

Loosen bar nuts.
Adjust tensioning screw until chain fits snugly.
Tighten bar nuts while lifting bar tip.
Re-check tension after tightening.

WARNING! Always stop engine before adjusting chain. Use gloves to avoid cuts.

Carburetor Adjustment

Adjust idle speed (L) and high speed (H) screws. Initial settings: L: 1 turn open, H: 1 turn open. Fine-tune for smooth acceleration and maximum RPM.

Troubleshooting Guide

Engine won't start: Check fuel, spark, compression. Engine runs poorly: Clean air filter, adjust carburetor, check fuel lines. Chain doesn't turn: Check clutch, sprocket, chain brake. Overheating: Clean cooling fins, check fuel mix, adjust carburetor.

CAUTION! Diagnose issues systematically; don't force components.

Parts List and Diagrams

Exploded views with part numbers for engine, fuel system, ignition, clutch, chain brake, guide bar, and handle. Order parts from authorized STIHL dealers.

Warranty and Support

Issue	Coverage	Action
Manufacturing defects	1 year limited warranty	Contact authorized STIHL dealer with proof of purchase.
Normal wear items	Not covered (chain, bar, spark plug, filters)	Replace with genuine STIHL parts.
Improper use or maintenance	Voids warranty	Follow manual instructions.
Technical support	Available online and by phone	Visit www.stihlusa.com or call 1-800-467-8445.
Manual updates	Check website	Download latest version from STIHL website.

Disclaimer: Repairs may require special tools; consult professional if unsure.

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