The Husqvarna FS 6600 is a professional-grade string trimmer/brushcutter designed for demanding clearing and maintenance tasks. This parts manual provides detailed diagrams, part numbers, and ordering information for all major assemblies and components to facilitate maintenance, repair, and safe operation of your FS 6600 power cutter. Below are key sections covering safety, identification, engine parts, cutting attachments, and maintenance schedules.
Critical safety warnings and explanations of symbols found on the machine and in the manual.
| Symbol | Description |
|---|---|
| ⚠️ | General Warning - Read the manual before operation. |
| 🔥 | Fire Hazard - Keep away from flammable materials; let engine cool before refueling. |
| 💨 | Exhaust Fumes - Operate only in well-ventilated areas. |
| 🛑 | Thrown Objects/Debris - Always wear eye and leg protection. Ensure guard is installed. |
| 🔧 | Maintenance Alert - Disconnect spark plug before performing maintenance. |
| 📏 | Safe Distance - Keep bystanders at least 15 meters away during operation. |
WARNING! Failure to follow safety instructions can result in serious injury or death. Always use genuine Husqvarna parts.
Locate your model and serial number for accurate parts identification.
Detailed parts list for the 2-stroke engine assembly (Cylinder, Piston, Crankshaft).
Note: Use a torque wrench when assembling engine components. Refer to Section 10 for values.
Parts for the power transmission from the engine to the cutting attachment.
| Part Description | Part Number | Qty |
|---|---|---|
| Solid Drive Shaft | 537 27 45-01 | 1 |
| Drive Shaft Tube (Upper) | 537 27 46-01 | 1 |
| Bevel Gear Set (17T/17T) | 537 27 47-01 | 1 Set |
| Gear Housing (Complete) | 537 27 48-01 | 1 |
| Output Shaft & Bearing | 537 27 49-01 | 1 |
| Grease Seal Kit | 537 27 50-01 | 1 Kit |
| Lock Nut (Output Shaft) | 537 27 51-01 | 1 |
Tip: Pack gear housing with high-quality grease (Husqvarna Grease) during assembly.
Parts for the cutting head, blades, and safety guard.
WARNING! Always use the correct guard for the attachment. Never operate without a guard.
Parts for the loop handle, controls, and harness attachment points.
Handle Assembly: Includes handlebar, vibration dampeners, and mounting clamp.
Throttle Control: Throttle trigger, throttle cable, lockout lever, and return spring.
Stop Switch: Ignition kill switch and wiring.
Harness Hooks & D-Rings: Attachment points for carrying harness.
Handle Screws & Bushings: All necessary hardware for assembly.
Components for fuel delivery and air intake.
CAUTION! Use only clean, fresh fuel. Stale fuel is a common cause of starting and performance issues.
Parts for starting and stopping the engine.
| Component | Part Number | Function |
|---|---|---|
| Ignition Module (CDI) | 537 27 52-01 | Provides spark to the plug. |
| Spark Plug (NGK BPMR7A) | 537 27 53-01 | Standard plug. Gap: 0.5 mm (0.020 in). |
| Stop Switch Assembly | 537 27 54-01 | Grounds ignition to stop engine. |
| Wiring Harness | 537 27 55-01 | Connects switch to module. |
Tip: Check spark plug condition and gap regularly. Replace if electrodes are worn.
Recommended service intervals for optimal performance and longevity.
Lubrication Points: Gear housing (grease), drive shaft joints (light oil), throttle linkage (light oil).
Critical fastener torque values to ensure safe and reliable assembly.
| Fastener Location | Torque (Nm) | Torque (ft-lbs) |
|---|---|---|
| Cylinder Head Nuts | 20-22 | 14.8-16.2 |
| Spark Plug | 25-30 | 18.4-22.1 |
| Output Shaft Lock Nut | 60-70 | 44.3-51.6 |
| Blade Mounting Nut | 35-45 | 25.8-33.2 |
| Handle Clamp Bolts | 15-18 | 11.1-13.3 |
| Gear Housing Screws | 8-10 | 5.9-7.4 |
Note: Use a calibrated torque wrench. Do not overtighten.
How to order parts and use the exploded view diagrams.
Reset: For persistent engine issues, a factory reset of carburetor settings may be required.
Service & Support: Contact an authorized Husqvarna service dealer. For dealer locator and manuals: www.husqvarna.com.