STIHL FS 45 Parts List Manual

The STIHL FS 45 is a lightweight, straight-shaft grass trimmer designed for residential use. This parts list manual provides detailed diagrams and part numbers for the FS 45 trimmer, including the engine assembly, drive shaft, cutting head, handle, and fuel system components. Use this guide for identification, ordering, and maintenance of genuine STIHL replacement parts.

1. Introduction & Safety 2. Engine Assembly Parts 3. Drive Tube & Shaft Parts 4. Cutting Attachment Parts 5. Handle & Control Parts 6. Fuel System Parts 7. Air Filter & Cooling System 8. Ignition System Parts 9. Starter Assembly Parts 10. Decals & Hardware 11. Ordering Information & Exploded Views

Introduction & Safety

This manual contains exploded views and part numbers for the STIHL FS 45 trimmer. Always use genuine STIHL parts for optimal performance and safety.

ItemDescription
Manual PurposeIdentification and ordering of replacement parts
ModelSTIHL FS 45 Straight Shaft Grass Trimmer
Engine Type2-stroke, single-cylinder, air-cooled
Safety NoteDisconnect spark plug before servicing. Use proper tools.
ReferenceAlways refer to the appropriate exploded diagram

Engine Assembly Parts

Cylinder, piston, crankshaft, and crankcase components.

  1. Cylinder (part # XXXX-XXX-XXXX)
  2. Piston with rings (part # XXXX-XXX-XXXX)
  3. Crankshaft assembly (part # XXXX-XXX-XXXX)
  4. Crankcase halves (part # XXXX-XXX-XXXX)
  5. Crankcase gasket set (part # XXXX-XXX-XXXX)

WARNING! Engine components are precision parts. Handle with care to avoid damage.

Drive Tube & Shaft Parts

Drive shaft, tube, bearings, and gearhead connection parts.

  1. Drive tube (part # XXXX-XXX-XXXX)
  2. Flexible drive shaft (part # XXXX-XXX-XXXX)
  3. Upper and lower shaft bearings (part # XXXX-XXX-XXXX)
  4. Gearhead coupling (part # XXXX-XXX-XXXX)
  5. Tube end plugs and seals (part # XXXX-XXX-XXXX)

CAUTION! Ensure drive shaft is properly lubricated during assembly.

Cutting Attachment Parts

Handle & Control Parts

Loop handle, throttle trigger, lockout, and control cable parts.

Handle Assembly: Includes vibration dampening elements (part # XXXX-XXX-XXXX).

Throttle trigger (part # XXXX-XXX-XXXX), throttle cable (part # XXXX-XXX-XXXX), trigger lockout lever (part # XXXX-XXX-XXXX), handle mounting clamp (part # XXXX-XXX-XXXX).

Fuel System Parts

Fuel tank, cap, filter, lines, and carburetor components.

  1. Fuel tank assembly (part # XXXX-XXX-XXXX)
  2. Fuel cap with vent (part # XXXX-XXX-XXXX)
  3. Fuel filter and line set (part # XXXX-XXX-XXXX)
  4. Carburetor (Zama C1Q series) rebuild kit
  5. Primer bulb and gaskets

Tip: Always use fresh fuel mix and replace fuel lines periodically.

Air Filter & Cooling System

Air filter cover, element, and cooling fan/shroud parts.

  1. Remove filter cover screw to access.
  2. Replace foam air filter (part # XXXX-XXX-XXXX).
  3. Cooling fan and flywheel (part # XXXX-XXX-XXXX).
  4. Cylinder shroud/cover (part # XXXX-XXX-XXXX).
  5. Spark arrestor screen (if equipped).

WARNING! Never operate without air filter. Clean regularly.

Ignition System Parts

Spark plug, ignition coil (module), and stop switch wires.

ComponentPart NumberNotes
Spark PlugBOSCH WSR6F or equivalentGap 0.020"
Ignition ModuleXXXX-XXX-XXXXIncludes coil and wiring
Stop SwitchXXXX-XXX-XXXXIntegrated into handle
Spark Plug BootXXXX-XXX-XXXXHigh-tension lead

Starter Assembly Parts

Starter housing, rope, pulley, spring, and pawls.

Starter Assembly Kit: Includes rope, handle, spring, and pulley (part # XXXX-XXX-XXXX).

Starter housing (part # XXXX-XXX-XXXX), recoil spring (part # XXXX-XXX-XXXX), starter pawls (part # XXXX-XXX-XXXX).

Decals & Hardware

Identification decals, warning labels, screws, nuts, and washers.

CAUTION! Replace all safety decals if damaged or illegible.

Ordering Information & Exploded Views

Use exploded diagrams for accurate part identification. Contact authorized STIHL dealers.

SymptomRelated AssemblyCommon Replacement Parts
Engine won't startFuel/Ignition SystemSpark plug, fuel filter, carb kit
Vibration/noiseDrive ShaftDrive shaft, bearings
Line not feedingCutting HeadSpool, spring, bump knob
Throttle stickingHandle ControlsThrottle cable, trigger assembly
Fuel leakFuel SystemFuel lines, tank gasket, cap

Dealer Locator: Visit www.stihlusa.com or call 1-800-467-8445.

Exploded Views: Refer to official STIHL FS 45 IPL (Illustrated Parts List) document.

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