Mtanlo .325-inch 7T Clutch Drum Kit for Husqvarna 340/345/350/445/450 — Clutch, Oil Pump & Needle Bearing

This comprehensive repair kit bundles the parts needed to restore or upgrade the clutch and final-drive components on a range of Husqvarna models. Designed to match the .325" 7-tooth sprocket specification, the set replaces common OEM numbers and fits popular saws such as the 340, 345, 350, 445 and 450. Each piece is precision-machined for alignment and durability, helping you get back to cutting with minimal downtime.

How do I know this kit fits my Husqvarna chainsaw?

Confirm compatibility by checking your saw’s model number and the chain pitch/specifications. This kit is intended for saws using a .325" pitch and a 7-tooth clutch sprocket; it also references OEM part numbers for cross-checking.

• Fits models: 340, 345, 350, 445, 450
• Chain pitch: .325" with 7T clutch sprocket
• Replaces part numbers: 578097901, 503931801, 537110503
• Check your existing drum/sprocket for matching tooth count and bore size

What components are included and why are they important?

The kit supplies all wear items that affect drive engagement and oil delivery. Replacing these together ensures correct spacing, reduces vibration, and restores chain lubrication, which extends saw life and performance.

• Clutch drum (.325" 7T) — central drive interface for the chain
• Clutch assembly — transfers engine torque to the drum
• Oil pump — maintains bar and chain lubrication during operation
• Worm gear — links the clutch to the oil pump drive
• Needle bearing — reduces friction and supports smooth rotation

How difficult is installation and what tools will I need?

Installation is moderate for anyone familiar with basic chainsaw maintenance. You’ll need a few hand tools and careful alignment; follow manufacturer torque settings and clean mating surfaces before reassembly.

• Essential tools: clutch removal tool, socket set, flat screwdriver, torque wrench
• Estimated time: 30–90 minutes depending on experience
• Prep steps: drain chain oil, remove bar and chain, clean housing
• Tip: replace worn or damaged fasteners while servicing the clutch area

Will installing this kit affect chain oiling or cutting performance?

Yes—replacing the oil pump and mating gear can restore consistent lubrication, which helps reduce chain wear and improves safe cutting. A correctly fitted drum and bearing also reduce wobble and vibration for more stable cutting control.

• Restored oil flow reduces bar and chain overheating
• Tight drive alignment improves chain engagement and reduces kickback risk
• New bearing lowers friction for smoother RPM transfer
• Overall result: better cutting consistency and longer component life

Who is this for? The Mtanlo .325" 7T clutch drum kit is geared toward homeowners, arborists and professional users who maintain Husqvarna models listed above and want a reliable, single-purchase solution for clutch and oil-delivery wear parts. It’s suited for anyone performing routine service, repairing a damaged clutch drum, or upgrading worn drivetrain components to restore factory-like operation. If you need exact fitment, verify model and part numbers before ordering to ensure a trouble-free install.