STIHL HS 45 Trimmer Parts Manual

The STIHL HS 45 is a professional-grade hedge trimmer designed for demanding trimming tasks. This parts manual provides detailed diagrams, part numbers, and descriptions for all components of the HS 45 trimmer, including the cutting blade assembly, drive system, engine components, fuel system, ignition system, housing, and controls. It is intended for authorized service technicians and users performing maintenance or repairs to ensure proper part identification and ordering.

1. Introduction & Safety 2. General Parts Information 3. Cutting Blade Assembly 4. Drive System & Gear Housing 5. Engine Components 6. Fuel System & Carburetor 7. Ignition System & Electronics 8. Housing, Handles & Controls 9. Fasteners & Miscellaneous Parts 10. Part Number Index 11. Ordering Information & Exploded Views

Introduction & Safety

This manual is a reference for genuine STIHL replacement parts. Always use STIHL original parts to maintain performance, safety, and warranty.

Safety SymbolMeaning
⚠️ WARNING!Indicates a potentially hazardous situation which, if not avoided, could result in serious injury or death.
⚠️ CAUTION!Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury or property damage.
ℹ️ NOTEIndicates important information for proper operation or maintenance.

WARNING! Disconnect the spark plug boot before performing any maintenance or parts replacement. Use appropriate personal protective equipment (PPE).

General Parts Information

All parts are identified by a unique STIHL part number. Refer to exploded-view diagrams for part location.

  1. Part Number Format: Typically 4-6 digits (e.g., 0000-000-0000).
  2. Using This Manual: Locate the assembly diagram, find the item number, and match it to the parts list.
  3. Compatibility: Parts listed are specific to the STIHL HS 45 model. Do not substitute parts from other models.
  4. Torque Values: Critical fasteners have specified torque settings; refer to service manual.

NOTE: Some parts are sold as assemblies; individual sub-components may not be available separately.

Cutting Blade Assembly

Components of the dual-sided reciprocating cutting blade system.

CAUTION! Blades are sharp. Handle with cut-resistant gloves. Ensure blades are properly tensioned and aligned after installation.

Drive System & Gear Housing

Parts related to power transmission from the engine to the cutting blades.

ItemPart NumberDescription
Drive Shaft4130 650 0200Transfers power to gearbox.
Eccentric Gear4132 650 1300Converts rotary motion to reciprocating.
Gear Housing4130 650 0101Main housing for drive components.
Needle Bearing9503 003 0480Bearing for eccentric gear.
Seal Kit4130 650 0900Gasket and seals for gear housing.

NOTE: Lubricate gears with STIHL gear grease (Part # 0781 400 0801) during assembly.

Engine Components

Parts for the single-cylinder, two-stroke engine (HS 45 specific).

  1. Cylinder: Part # 4130 650 3001 - Includes cylinder and cooling fins.
  2. Piston & Rings: Part # 4130 650 3100 - Piston assembly with rings and wrist pin.
  3. Crankshaft: Part # 4130 650 3200 - Engine crankshaft.
  4. Muffler: Part # 4130 650 4300 - Exhaust muffler with spark arrestor screen.
  5. Rewind Starter: Part # 4130 650 5000 - Complete starter assembly, including pulley and rope.
  6. Air Filter: Part # 4130 650 6301 - Foam air filter element.

WARNING! Engine components must be installed with precise clearances. Refer to engine service specifications.

Fuel System & Carburetor

Components for fuel delivery and mixture. Carburetor model: Zama C1Q-S series.

CAUTION! Use only clean, fresh fuel mixed with STIHL HP Ultra 2-cycle oil at a 50:1 ratio. Ensure all fuel lines are securely connected and leak-free.

Ignition System & Electronics

Parts for engine ignition and stop switch.

ComponentPart NumberNotes
Ignition Module (Coil)4130 650 8000Includes spark advance.
Spark Plug0000 400 1300Bosgo WR7CC (or equivalent).
Stop Switch4130 650 8200Complete handle switch assembly.
Wiring Harness4130 650 8300Main wiring loom.
Spark Plug Boot0000 400 2005Suppressor type.

NOTE: Check spark plug gap (0.020 in / 0.5 mm) and ensure wiring is routed away from hot surfaces.

Housing, Handles & Controls

External casing, handles, and control components.

  1. Main Housing: Part # 4130 650 1001 - Engine and drive housing, upper section.
  2. Rear Handle: Part # 4130 650 1100 - D-grip handle with vibration damping.
  3. Front Handle: Part # 4130 650 1200 - Loop handle with mounting hardware.
  4. Throttle Trigger:4130 650 1400 - Throttle lever and spring assembly.
  5. Throttle Lockout: Part # 4130 650 1500 - Safety interlock lever.
  6. Vibration Dampers: Part # 4130 650 1600 - Set of anti-vibration mounts.

CAUTION! Ensure all handle fasteners are tight and controls operate smoothly without binding.

Fasteners & Miscellaneous Parts

Common screws, nuts, washers, and small parts.

NOTE: Always replace self-locking nuts and damaged screws. Do not reuse circlips or split washers.

Part Number Index

Alphabetical/numerical quick reference for key parts.

Part NamePart Number
Air Filter4130 650 6301
Carburetor Kit4130 650 2400
Cylinder4130 650 3001
Fuel Cap4130 650 2201
Ignition Module4130 650 8000
Lower Blade4132 650 7801
Piston Assembly4130 650 3100
Spark Plug0000 400 1300
Starter Assembly4130 650 5000
Upper Blade4132 650 7701

Ordering Information & Exploded Views

How to order parts and interpret diagrams.

  1. Ordering: Contact an authorized STIHL dealer with the model name (HS 45) and part number.
  2. Exploded Views: Diagrams show part relationships and item numbers (1, 2, 3...).
  3. Dealer Locator: Visit www.stihlusa.com to find your nearest dealer.
  4. Technical Support: For assembly questions, consult your STIHL dealer or the HS 45 service manual.

WARNING! Incorrect assembly can lead to equipment failure or personal injury. If unsure, seek professional service.

STIHL Limited Warranty: Use of non-STIHL parts may void the warranty. Keep your sales receipt.

STIHL HS 45 Trimmer Parts Manual © - All Rights Reserved 2025