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Description
4243 182 4501 STIHL Torsion Spring – Genuine OEM Angle Drive Part
The STIHL Torsion Spring (4243 182 4501) is a genuine OEM internal component designed for use within the adjustable angle drive assemblies of select STIHL long-reach hedge trimmers and KombiSystem attachments. This torsion spring provides the necessary tension and return force for smooth angle adjustment and secure positioning of the gear head mechanism.
Over time, torsion springs can weaken, lose tension, or break due to vibration, repeated angle adjustments, debris exposure, or extended professional use. A worn spring may result in poor angle locking, loose gear head positioning, or reduced adjustment stability. Replacing it with the correct OEM part restores proper tension and safe angle drive operation without replacing the entire gearbox assembly.
Manufactured to STIHL factory specifications, this genuine torsion spring ensures correct fitment, reliable tension, and long-term durability under demanding trimming conditions.
Product Details
OEM Part Number: 4243 182 4501
Brand: STIHL (Genuine OEM)
Part Type: Torsion Spring
Application: Adjustable angle drive / gear head tension mechanism
Condition: New Genuine OEM Part
Function
This STIHL torsion spring is designed to:
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Provide tension for adjustable angle drive mechanisms
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Support secure gear head positioning and locking
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Restore smooth angle adjustment operation
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Replace weakened or broken torsion springs
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Maintain long-term angle drive stability and performance
⚠️ A failing torsion spring can cause loose angle positioning or unsafe gear head adjustment.
Verify Fitment (Recommended)
Before ordering, confirm:
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OEM part number 4243 182 4501
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Your unit model matches those listed below
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Application matches your STIHL illustrated parts diagram
⚠️ Angle drive components are model-specific — always verify by OEM part number and gear head configuration.
Compatibility
This OEM torsion spring fits select STIHL long-reach hedge trimmers and Kombi attachments equipped with adjustable angle drive assemblies, including:
Long-Reach Hedge Trimmers / Angle Drive Units
HL (Angle drive, adjustable thru 145°, 600 mm)
HL 145° (Angle drive, adjustable thru 145°, 600 mm)
HL 91 K (Angle drive, adjustable thru 130°, 600 mm)
HL 94 / HL 94 K / HL 94 KC-E
(Angle drive, adjustable thru 145°, 600 mm)
HL-KM 145°
(Angle drive, adjustable thru 145°, 500 mm)
HLA 135 / HLA 135 K
(Angle drive, adjustable thru 145°, 600 mm)
HLA 150.0
(Angle drive, adjustable thru 145°, 600 mm)
Kombi Attachments (Angle Drive)
FH 145° (Angle drive, adjustable thru 145°, 250 mm)
FH-KM 145° (Angle drive, adjustable thru 145°, 250 mm)
(Exact fitment depends on production version — always verify using OEM parts diagram.)
Installation Notes
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Disconnect spark plug before servicing
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Access adjustable angle drive housing assembly
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Carefully remove worn torsion spring (spring tension present)
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Install new spring in correct orientation and seating position
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Inspect locking mechanism and lubrication during service
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Reassemble gear head and test angle adjustment function
⚠️ Springs are under tension — service should be performed carefully or by a qualified technician.
Maintenance Tips
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Inspect angle adjustment mechanism regularly for looseness
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Maintain proper lubrication in angle drive gearbox
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Avoid forcing angle adjustment beyond designed range
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Replace worn springs promptly to ensure safe locking
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Always use genuine STIHL OEM angle drive components for correct fit and durability
