The Husqvarna 266 is a professional-grade chainsaw known for its power and reliability. This parts manual provides detailed diagrams, part numbers, and ordering information for the complete assembly, including the engine, fuel system, ignition, chain brake, guide bar, chain, and all associated components. Below are key sections for identification, engine parts, cutting equipment, maintenance, and ordering.
Identify your Husqvarna 266 model using the serial number plate. Key specifications for parts compatibility.
| Feature | Description |
|---|---|
| Engine Displacement | 66.7 cc (4.07 cu. in.) |
| Power Output | Approx. 4.3 kW (5.8 hp) |
| Fuel Tank Volume | 0.85 L (1.8 US pt) |
| Oil Tank Volume | 0.35 L (0.74 US pt) |
| Recommended Bar Lengths | 15" to 24" (38 cm to 61 cm) |
| Chain Pitch | 3/8" or .325" |
| Spark Plug Type | NGK BPMR7A or equivalent |
| Ignition System | Electronic (SEM) |
| Weight (Powerhead) | Approx. 6.7 kg (14.8 lbs) |
| Serial Number Location | On crankcase, near rear handle |
Complete breakdown of the engine crankcase, cylinder, piston, crankshaft, and bearings.
WARNING! Always disconnect the spark plug wire before performing any engine disassembly.
Parts for the carburetor, fuel lines, filter, ignition coil, and spark plug.
CAUTION! Use only genuine Husqvarna fuel system parts to prevent leaks and engine damage.
Front and rear handles, anti-vibration elements, throttle trigger, lockout, and housing parts.
Rear Handle: Includes throttle trigger, throttle lockout, choke/kill switch, and anti-vibration mounts. Front Handle: Handlebar, mounting bolts, and heat shield. Housing/Covers: Top cover, chain brake cover, side/rear housing, and all associated clips, screws, and decals. Safety Labels: Replacement warning and instruction decals.
Recommended parts replacement schedule for optimal performance and safety.
Tip: Keep a log of part replacements and service dates.
Refer to the following diagram groups for visual part identification and assembly order.
WARNING! Use diagrams during disassembly to ensure correct reassembly. Note screw lengths and locations.
How to order genuine Husqvarna parts.
Always provide the saw's model number (266), serial number, and the part number from this manual. Contact an authorized Husqvarna dealer or use the online parts lookup at www.husqvarna.com. Part Number Example: Piston Ring - 501 59 45-01.
Using incorrect or non-genuine parts can compromise safety and void warranty.
CAUTION! Always use Husqvarna-approved guide bars, chains, and safety components. Never modify the chain brake or throttle controls with non-standard parts. Wear appropriate PPE during parts replacement.
Genuine Husqvarna parts are covered by warranty against defects in materials and workmanship. Warranty does not cover wear items (chain, bar, spark plug, filters) or damage from misuse. For technical support and dealer location, visit www.husqvarna.com or contact 1-800-487-5962.
| Symptom | Possible Part Failure | Corrective Action |
|---|---|---|
| Engine won't start | Fouled spark plug, faulty ignition module, clogged fuel filter | Replace spark plug; test/replace ignition; replace fuel filter and lines. |
| Loss of power | Worn piston/rings, clogged air filter, damaged carburetor diaphragm | Check compression; replace air filter; rebuild carburetor with kit. |
| Chain won't oil | Clogged oil line, worn oil pump gear, faulty drive pin | Clean oil passages; replace oil pump components. |
| Excessive vibration | Worn anti-vibration buffers, unbalanced clutch, bent crankshaft | Replace buffer mounts; inspect clutch and crankshaft. |
| Chain brake not engaging | Worn/broken brake band, weak or broken spring, sticky linkage | Replace brake band and spring; clean and lubricate linkage. |
Note: For complex repairs, consult an authorized Husqvarna service dealer.
Service: 1-800-487-5962; www.husqvarna.com