Carrier Roller Assembly for Caterpillar 320C / 320D / 320E Excavator - Replaces 422-2405 - Sealed & Lubricated Top Roller

Replace Your Seized Top Roller Before It Snaps Your Track

Everyone checks the bottom rollers. But the top roller — the one carrying the track chain over the top of the undercarriage — gets ignored. When it seizes, it stops spinning and the track drags across it, wearing a flat spot into the roller surface. That flat spot grinds into the track links every revolution, and eventually snaps the $8,000 track chain.

A $229 roller now prevents an $8,000 track replacement later.

The Problem

Carrier rollers fail for two reasons:

• Seal failure: The internal seal wears, allowing dirt and water to contaminate the grease. The bearing seizes.
• Impact damage: Rocks and debris strike the roller, denting the housing and causing the shaft to bind.

A seized top roller creates a distinctive rhythmic clunking sound and you'll see a shiny flat spot worn into the roller surface. If you catch it early, you just replace the roller. If you wait, it destroys the track.

What's Included

• Complete carrier roller assembly — bolt-on ready
• Pre-sealed and pre-lubricated — no greasing required at install
• Mounting hardware included

Technical Specifications

• Cat Part Number: 422-2405
• Cross Reference: 8E-5600
• Type: Single Flange Carrier Roller
• Bearing: Sealed, Lubricated
• Construction: Hardened steel shell, precision machined
• Condition: Brand New

Compatible Caterpillar Excavators

• Cat 315C / 315D Excavator
• Cat 318C / 318D Excavator
• Cat 320C / 320D / 320E / 320F Excavator
• Cat 321C / 321D Excavator
• Cat 322C / 322D Excavator
• Cat 323D / 323E / 323F Excavator
• Cat 324D / 324E Excavator
• Cat 325C / 325D Excavator

Fits all Caterpillar mid-size excavators that use part number 422-2405 or 8E-5600. Check your parts book to confirm.

Why Buy From Trenchwell?

• Save 40%+ vs Dealer: Cat dealers charge $350–$450 for this roller. We sell it for $229.
• Same Quality Standard: Built to the same precision undercarriage specifications as the factory roller. Hardened steel, precision-machined bore, sealed bearing.
• Bolt-On Ready: Pre-sealed and pre-lubricated. Unbolt the old roller, bolt on the new one. 20-minute job.
• Prevent Catastrophic Damage: A seized carrier roller will destroy your track chain. This is the cheapest undercarriage repair you can make.

How to Tell if Your Carrier Roller Needs Replacing

1. Spin Test: With the track loosened, try to spin each top roller by hand. If it won't spin freely or feels rough/gritty, it's failing.
2. Visual: Look for flat spots, cracks, or oil/grease leaking from the roller seals.
3. Listen: A rhythmic clunking or squealing from the top of the undercarriage while tracking.