HUSQVARNA 445 450 Oil Drive Pump Worm Gear

Oil drive pump worm gear fits Husqvarna 445 and 450 chainsaws. The worm gear sits on the crankshaft and drives the oil pump rotor by direct mesh engagement, maintaining a continuous flow of bar and chain oil to the guide bar during cutting. On the 445/450 series the gear is a model-specific profile confirm against your old part before ordering. Worn or stripped teeth on the worm gear break the drive connection to the oil pump, resulting in a dry guide bar and chain lubrication failure. Because the engine continues to run normally, oil starvation caused by a failed worm gear can go unnoticed until visible wear appears on the bar rails or drive links. Replacing the gear is a straightforward fix that restores full oil pump drive without replacing the entire pump assembly.

Fits the following Husqvarna models:

• Husqvarna 445
• Husqvarna 450