Overview:
This genuine Husqvarna worm gear is the drive component that powers the oil pump on .325 in (8.25 mm) pitch chainsaw set-ups. Built from durable polymer for reliable service, it transfers rotation from the clutch side to the pump, keeping bar and chain lubrication steady during cutting. It is engineered for correct fit and alignment on Husqvarna mid-size petrol saws, including the 340 and 345, helping maintain smooth operation and reduce wear to the bar and chain. As an OEM part (503 93 18-01), it matches the original specification for material, tolerances, and engagement with the clutch drum and pump drive, making it a straightforward replacement when the existing worm gear shows signs of wear, heat damage, or stripped threads.

Key Features:
- Genuine Husqvarna OEM part for correct fit and dependable performance (503 93 18-01)
- Suits .325 in (8.25 mm) pitch systems used on the listed Husqvarna models
- Drives the oil pump to maintain consistent bar and chain lubrication
- Robust polymer construction resists wear and heat under normal operating loads
- Accurate moulding for smooth engagement with clutch and pump drive components
- Direct replacement; quick to fit with standard workshop tools
- Helps prevent chain burn and premature bar wear by restoring oil flow
- Suitable for both standard and "E"/Mark II variants in the model list
- Designed for longevity to reduce downtime and maintenance frequency
- Clearly identifiable by OEM number for easy parts matching

Typical Applications:
Replacement of a worn or damaged oil pump worm gear during routine service or after clutch-side repairs. Used to restore reliable chain oiling on Husqvarna mid-range saws in forestry, landscaping, construction site work, grounds maintenance, and domestic firewood cutting, where steady lubrication is essential for clean cutting and long component life.

Also known as:
Oil pump worm, oiler drive gear, lubrication drive gear, oil pump drive, helical worm gear, pump pinion, clutch-side worm, chain oiler gear, drive worm for oil pump.

Fits Models:
340, 340E, 345, 345E, 350, 445, 445E, 445EII, 445II, 450, 450EII

Alternate Part Numbers:
503 93 18-01, 503931801