Stihl 026 Chainsaw Parts Manual

The Stihl 026 is a professional-grade gasoline chainsaw known for its reliability and power-to-weight ratio. This parts manual provides detailed diagrams, part numbers, and descriptions for all components of the Stihl 026 chainsaw, including the engine assembly, fuel system, ignition system, cutting equipment, and housing. Below are key sections for identification, engine parts, fuel system, ignition, cutting attachments, assembly instructions, and ordering information.

1. Identification & Specifications 2. Engine Assembly Parts 3. Fuel System Components 4. Ignition System Parts 5. Cutting Equipment & Bar 6. Housing & Covers 7. Carburetor Parts 8. Starter Assembly 9. Assembly & Installation Guide 10. Parts Ordering Information 11. Troubleshooting & Maintenance

Identification & Specifications

Key identifiers: Model number 026, serial number location on crankcase. Engine type: Single-cylinder, two-stroke gasoline engine.

Specification	Description
Displacement	49.4 cc (3.01 cu. in.)
Power Output	2.6 kW (3.5 hp)
Fuel Tank Capacity	0.5 L (16.9 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)	4.9 kg (10.8 lbs)
Ignition System	Electronic, breakerless
Carburetor	Stihl Zama or equivalent
Spark Plug	Bosch WSR 6 F or equivalent

Engine Assembly Parts

Cylinder, piston, crankshaft, connecting rod, bearings, seals, and crankcase components.

Cylinder Assembly: Includes cylinder, fins, and exhaust port.
Piston Assembly: Piston, rings, wrist pin, and circlips.
Crankshaft: Main shaft with integrated counterweights.
Crankcase: Upper and lower halves with gaskets.
Bearings & Seals: Main bearings, crankshaft seals, and O-rings.

WARNING! Engine components are precision parts; handle with care to avoid damage. Use proper tools for disassembly.

Fuel System Components

Fuel tank, cap, lines, filter, pump, and carburetor connections.

Fuel Tank: Polyethylene tank with integrated filter neck.
Fuel Lines: Supply and return lines with clamps.
Fuel Filter: In-tank filter element.
Fuel Pump: Diaphragm-type pump (if equipped).
Carburetor Mount: Gaskets and insulator block.

CAUTION! Ensure fuel system is clean and free of debris. Replace cracked or brittle fuel lines.

Ignition System Parts

Ignition Module: Electronic control unit.
Spark Plug Boot: High-tension lead and connector.
Stop Switch: Wiring and switch assembly.
Flywheel: Magneto and fan assembly.
Coil: Ignition coil with mounting hardware.
Wiring Harness: Connects ignition to switch and ground.

Cutting Equipment & Bar

Guide bar, chain, sprocket, clutch, and chain tensioner components. Front Panel: Chain brake, hand guard, bar nuts.

Guide Bar: Roller-nose or solid-nose types in various lengths. Chain: Cutting chain with drive links, cutters, and tie straps. Sprocket: Rim or spur-type drive sprocket. Clutch: Centrifugal clutch assembly with springs and shoes. Tensioner: Screw-type adjuster with pinion gear.

Housing & Covers

Main housing, side covers, air filter cover, muffler cover, and handle components.

Turn off chainsaw and ensure spark plug is disconnected before removing covers.
Match screws and fasteners to correct locations (e.g., M5x20 for side cover).
Inspect housing for cracks or damage; replace if compromised.

Tip: Keep housing clean to prevent overheating and ensure proper airflow.

Carburetor Parts

Supports Stihl Zama or equivalent carburetors with adjustment screws, diaphragms, and jets.

Disassembly: Remove carburetor from intake; note orientation of linkages.
Components: Main body, throttle and choke plates, diaphragms (pump and metering), gaskets, needles, jets, and adjustment screws (H, L, LA).
Cleaning: Use carburetor cleaner and compressed air; replace worn diaphragms.
Reassembly: Install new gaskets; set initial screw settings (H: 1 turn, L: 1 turn).
Testing: Check for leaks and proper idle/high-speed operation.

WARNING! Use genuine repair kits. Incorrect adjustment can cause engine damage.

Starter Assembly

Starter pulley, rope, handle, spring, and recoil housing parts.

Assembly & Installation Guide

Refer to diagrams for torque specifications and assembly sequences.

CAUTION! Use thread locker where specified. Do not overtighten plastic components.

Parts Ordering Information

Use genuine Stihl parts for optimal performance and safety. Include model number (026) and part number when ordering. For support, visit www.stihlusa.com or contact authorized Stihl dealers. Copyright © 2025 Stihl; trademarks of Stihl Incorporated. Always reference the illustrated parts list for correct part identification.

Troubleshooting & Maintenance

Symptom	Possible Cause	Corrective Action
Engine will not start	Fuel, spark, compression	Check fuel freshness and filter; inspect spark plug and ignition; verify compression.
Engine runs poorly	Carburetion, air filter	Clean/replace air filter; adjust carburetor H and L screws; check fuel lines.
Chain does not turn	Clutch, sprocket, brake	Inspect clutch springs and shoes; check sprocket wear; ensure chain brake is disengaged.
Excessive vibration	Balance, loose components	Check for loose bolts/mounts; inspect crankshaft and clutch balance; replace damaged parts.
Oil not feeding to bar	Oil pump, lines, tank	Verify oil pump operation; clean oil passages and filter; ensure oil tank vent is clear.

Maintenance Schedule: Daily: Clean air filter, check chain tension. Monthly: Inspect spark plug, clean cooling fins. Annually: Replace fuel filter, inspect clutch and sprocket.

Service: Authorized Stihl dealers; www.stihlusa.com