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Description
4243 640 0535 STIHL Gear Housing – Genuine OEM Angle Drive Part
The STIHL Gear Housing (4243 640 0535) is a genuine OEM gearbox casing component designed for select STIHL long-reach hedge trimmers and KombiSystem attachments equipped with adjustable angle drive assemblies. This gear housing forms the structural body of the angle drive unit, protecting internal gears and ensuring proper blade drive alignment.
Over time, gear housings may become cracked, worn, or damaged due to vibration, heavy-duty trimming, debris intrusion, or impact. A damaged housing can lead to grease leakage, gear misalignment, overheating, or premature gearbox failure. Replacing it with the correct OEM part restores proper gear head integrity without replacing the complete attachment.
Manufactured to STIHL factory specifications, this genuine gear housing ensures precise fitment, secure sealing, and long-term durability under professional operating conditions.
Product Details
OEM Part Number: 4243 640 0535
Brand: STIHL (Genuine OEM)
Part Type: Gear Housing / Angle Drive Casing
Application: Adjustable angle drive gearbox assembly
Condition: New Genuine OEM Part
Function
This STIHL gear housing is designed to:
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Enclose and protect internal angle drive components
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Maintain proper alignment of gears and bearings
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Retain lubrication within the gearbox
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Replace cracked or damaged gear housings
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Support long-term blade drive reliability and performance
⚠️ A damaged gear housing can cause grease leakage, misalignment, or gearbox failure.
Verify Fitment (Recommended)
Before ordering, confirm:
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OEM part number 4243 640 0535
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Your unit model matches those listed below
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Application matches your STIHL illustrated parts diagram
⚠️ Gear housings are model- and configuration-specific — always verify by OEM part number and angle drive type.
Compatibility
This OEM gear housing 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
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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Remove cutter bar and access angle drive assembly
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Carefully disassemble gearbox on a clean surface
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Transfer internal gears, bearings, and seals as required
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Install new gear housing and ensure proper alignment
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Repack gearbox with STIHL-approved grease
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Reassemble and torque fasteners to specification
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Test blade movement and angle adjustment operation
⚠️ Gearbox rebuilding should be performed by a qualified technician to ensure proper alignment and lubrication.
Maintenance Tips
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Inspect gear head regularly for grease leaks or cracks
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Maintain proper gearbox lubrication intervals
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Avoid impact or forcing angle adjustments
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Replace worn seals promptly to prevent contamination
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Always use genuine STIHL OEM gear head components for correct fit and durability
