Husqvarna FS6600D Parts Manual

The Husqvarna FS6600D is a professional-grade string trimmer/brushcutter designed for demanding clearing and trimming tasks. This parts manual provides detailed diagrams, part numbers, and ordering information for all components of the FS6600D, including the engine, cutting head, drive shaft, handles, and controls. Use this manual for identification, maintenance, and repair part sourcing to ensure optimal performance and longevity of your equipment.

1. Introduction & Safety 2. Engine Assembly Parts 3. Drive Shaft & Gearbox Parts 4. Cutting Attachment Parts 5. Handle & Control Parts 6. Fuel System Parts 7. Ignition System Parts 8. Air Filter & Cooling System 9. Ordering Information & Exploded Views 10. Warranty & Support

Introduction & Safety

This manual is intended for professional service technicians and qualified users. Always refer to the original operator's manual for safety, operation, and maintenance instructions before performing any service.

Warning Symbol	Meaning
⚠️	Indicates a potentially hazardous situation which, if not avoided, could result in serious injury or death.
⚡	Risk of electric shock from ignition system. Disconnect spark plug boot before servicing.
🔥	Hot surface warning. Allow engine to cool completely before handling parts.

WARNING! Use only genuine Husqvarna replacement parts. Non-approved parts may void warranty and compromise safety.

Engine Assembly Parts

Major components of the 2-stroke engine assembly.

Cylinder & Piston Group: Includes cylinder, piston, piston rings, wrist pin, and circlips.
Crankcase & Crankshaft: Includes crankcase halves, crankshaft, main bearings, and seals.
Starter Assembly: Recoil starter, pulley, spring, rope, and handle.
Engine Covers: Top cover, air filter cover, and muffler cover.

Note: Torque all fasteners to specifications. Part numbers are listed in corresponding exploded diagrams.

Drive Shaft & Gearbox Parts

Parts for the drive shaft assembly and gearbox that transfer power to the cutting head.

Drive Shaft: Flexible or solid shaft, upper and lower couplings.
Gearbox Housing: Aluminum housing, bearings, and seals.
Bevel Gears: Input and output bevel gears, shims for adjustment.
Output Shaft: Shaft, retaining nut, and washer for attaching cutting head.

Tip: Lubricate gearbox with specified grease during reassembly.

Cutting Attachment Parts

Components for the trimmer head and blade attachments.

Part	Description	Compatible Attachments
Trimmer Head	Bump-feed head, spool, spring, eyelets	Uses 2.4mm line
Blade Adapter	Mounts circular blades or brush knives	3-tooth, 8-tooth, brush blades
Blade Bolt & Washer	Secures blade to output shaft	M10 x 1.25
Guard	Deflector shield for trimmer head or blade	Specific to attachment type

CAUTION! Always use the correct guard for the cutting attachment installed.

Handle & Control Parts

Parts related to operator controls and handle assembly.

Loop Handle: Handlebar, vibration dampeners, clamp bolts.
Throttle Control: Throttle trigger, throttle cable, lockout lever, and springs.
Harness Attachment Points: D-rings and brackets for harness connection.
Control Cables: Throttle and stop switch cables with adjusters.

WARNING! Ensure throttle trigger returns to idle automatically and stop switch functions before use.

Fuel System Parts

Components of the carburetor and fuel delivery system.

Carburetor Assembly: Zama or Walbro carburetor, diaphragm, gaskets, jets.
Fuel Tank: Polyethylene tank, cap, vent, and fuel line.
Fuel Filter: In-tank filter and fuel line primer bulb (if equipped).
Air Purge System: Purge bulb and associated hoses.

Note: Use ethanol-free fuel or add fuel stabilizer to prevent carburetor issues.

Ignition System Parts

Parts for the electronic ignition and stopping system.

Ignition Module (Coil): Generates spark. Includes mounting screws and spark plug wire.

Spark Plug: NGK BPMR7A or equivalent. Gap: 0.020" (0.5mm).

Stop Switch: Kill switch assembly and wiring harness.

Flywheel & Magneto: Flywheel with magnets, key, and fan.

CAUTION! Always disconnect the spark plug boot before working on the ignition system.

Air Filter & Cooling System

Components for engine air intake and cooling.

Air Filter: Foam filter element, pre-filter, and filter cover.
Carburetor Cover: Intake cover with gasket.
Cylinder Cooling Fins: Keep fins clean of debris for proper cooling.
Muffler & Spark Arrestor: Muffler body, gasket, and screen spark arrestor.

Maintenance: Clean air filter regularly. Check and clean spark arrestor screen.

Ordering Information & Exploded Views

How to order parts and interpret diagrams.

Each major assembly has an associated exploded view diagram with reference numbers. To order:

Identify the part name and reference number from the diagram.
Locate the corresponding part number in the parts list table.
Provide the part number to your authorized Husqvarna dealer.

Example Diagram Reference: [Engine Assembly - Fig. 1] would be included here in the actual manual.

Tip: Always provide the model number (FS6600D) and serial number when ordering.

Warranty & Support

Husqvarna Limited Warranty for professional products. Use only genuine parts to maintain warranty coverage.

Issue	Support Channel
Parts Identification	Refer to this manual or consult your dealer.
Ordering Parts	Contact an authorized Husqvarna dealer.
Technical Assistance	Dealer service department or Husqvarna USA.
Warranty Claims	Process through selling dealer with proof of purchase.

Contact: Husqvarna USA | 1-800-487-5962 | www.husqvarna.com/us