Stihl Gasket - OEM Number: 4243-649-0300

The Stihl Gear Case Gasket (OEM 4243 649 0300) is a genuine replacement sealing gasket designed for use on selected Stihl long-reach hedge trimmers and KombiSystem hedge trimmer attachments. Installed between the gear case and mating housing, the gasket creates a reliable seal that helps retain gearbox lubricant while preventing the ingress of dirt, dust, moisture, and other contaminants. Stihl identifies 4243 649 0300 as a genuine gasket for a range of HL-series hedge trimmers and compatible Kombi attachments.

Manufactured to OEM specifications, this gasket is produced from a durable, oil-resistant gasket material capable of withstanding vibration, temperature fluctuations, and prolonged exposure to gearbox lubricants. Maintaining an effective seal is essential for protecting internal gears and bearings, helping to ensure smooth operation and maximise gearbox service life.

FUNCTION AND OPERATION

• Creates a secure seal between gearbox mating surfaces
• Prevents grease leakage from the gear case
• Protects internal gears and bearings from contamination
• Maintains gearbox lubrication for smooth operation
• Supports long-term reliability of the cutting head
• Designed for professional landscaping and grounds maintenance equipment

TECHNICAL DETAILS

• OEM Part Number: 4243 649 0300
• Type: Gear case gasket
• Function: Gearbox sealing gasket
• Application: Hedge trimmer gear case assembly
• Construction: Oil- and grease-resistant compressed gasket material
• Design: OEM-configured direct replacement component
• Alternative Part Number Format: 42436490300

TYPICAL APPLICATIONS

Suitable for selected Stihl equipment, including:

• Stihl HL 56 K
• Stihl HL 91 K
• Stihl HL 91 KC
• Stihl HL 92 C
• Stihl HL 92 KC
• Stihl HL 94
• Stihl HL 94 C
• Stihl HL 94 K
• Stihl HL 94 KC
• Stihl HL-KM 0°
• Stihl HL-KM 0°-145°
• Stihl FH-KM 145°
• Stihl HLA 135
• Stihl HLA 135 K

The gasket is used within the angle drive/gear case assembly to provide an effective seal whenever the gearbox is assembled or serviced.

IMPORTANT INFORMATION

Always confirm the correct OEM part number, machine model, and serial number before ordering, as Stihl uses several different gear case gaskets across its hedge trimmer and KombiSystem ranges. Although visually similar, these gaskets vary in shape and fixing pattern depending on the gearbox design.

Whenever the gear case is dismantled for maintenance or repair, it is recommended to install a new gasket to ensure a reliable seal. Reusing a compressed or damaged gasket can result in grease leakage, contamination of the gearbox, accelerated wear of gears and bearings, and reduced cutting head service life. When replacing the gasket, inspect the gearbox housing, mating surfaces, bearings, seals, and gear lubricant to ensure the assembly is clean, correctly lubricated, and free from damage before reassembly.

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery*
£11.95 or FREE for orders over £150
Orders placed before 4pm Monday to Friday will be delivered on the next business day.
Orders placed after 4pm on Friday will be delivered the following Tuesday.
*Next day delivery applies to stocked items only. Availability can be found on the product pages.

Premium Delivery*
£30.00 for delivery before 10:30am
£25.00 for delivery before 12:30pm
*Premium delivery applies to stocked items only. Availability can be found on the product pages.

For all other countries, please click here for full delivery information.

**Separate carriage charges apply to bulk products such as 205L barrels.