Carlton Apache 2518 Diesel Catalytic Converter Rebuild
New England Supply House is the only company in the U.S. rebuilding wood chipper catalytic converters.
The Carlton Apache 2518 is an 18-inch capacity drum chipper with a massive 25-inch by 18-inch infeed opening built for whole-tree processing. Diesel versions run a John Deere Tier 4 Final turbocharged diesel (140 HP or 173 HP) with DOC/DPF aftertreatment. Large-capacity production chipping stresses this aftertreatment system significantly. New England Supply House rebuilds these through our core-exchange program.
Engine & Exhaust System
| Engine | John Deere Tier 4 Final Turbocharged Diesel (140 HP or 173 HP) |
|---|---|
| Catalyst Type | Diesel oxidation catalyst (DOC) + diesel particulate filter (DPF) |
Why Catalytic Converters Fail on This Machine
John Deere Tier 4 Final engines use an integrated exhaust filter (IEF) combining DOC and DPF functions. The system is designed for continuous-duty applications, not the stop-start cycle of a brush chipper. Frequent cold starts and short run times prevent the filter from reaching passive regen temperature, leading to progressive soot loading. When the filter plugs, backpressure codes appear and chipping performance drops. Ash loading from normal oil consumption also contributes to filter plugging over time.
What’s Included in the Rebuild
- Full disassembly and inspection of the catalyst housing and substrate
- New catalyst substrate installed to OEM specifications
- Reassembly using your existing housing (core exchange — your housing returns to you)
- Performance verification before return shipping
- Warranty against manufacturing defects
How Core Exchange Works
Core exchange is required — we rebuild your catalytic converter, so we need your core to complete the job.
- Place your order. Order the converter rebuild you need — gas or diesel — at newenglandsupplyhouse.com.
- Get your converter to us. Choose drop-off or shipping at checkout and we’ll send instructions — drop-off is by appointment at our Foxboro shop, or ship it to us from anywhere in the country. We rebuild your unit with new internals.
- Back to work in 1–2 days (typically). Standard turnaround is 1–2 business days. Need it sooner? Ask about our 24-hour rush rebuild.
Call for a quote
We rebuild the catalytic converter on the Carlton Apache 2518 on a core exchange. Call with your machine and engine and we will confirm fit, give you a price, and set up your order. Rebuilt and on its way back in 1–2 business days, typically.
Have your chipper’s make, model, and engine handy. Photos of the converter help too.