Forestry Mulcher DOC Rebuild

New England Supply House rebuilds the diesel oxidation catalyst (DOC) on forestry mulchers and mulching track carriers — core exchange, built to meet EPA emissions standards, usually a 3–5 business day turnaround, for a fraction of OEM cost.

Brands & machines we rebuild

Does your forestry mulchers have a rebuildable DOC?

Mulchers live in extreme dust and high load, so their catalysts foul fast — recurring rebuild demand. The best-fit machines run Cummins QSF3.8 / QSB6.7 / QSB4.5 diesels (roughly 2014–2019 US builds), which use a filter-free DOC+SCR — a standalone flow-through DOC, exactly what we rebuild. Cat-engined carriers (Rayco T415, PrimeTech PT-300/475) and newer Stage V machines use a full DOC+DPF+SCR stack where the DOC isn’t a simple swap — call us to check yours before shipping.

Pricing: Off-road converter rebuilds are quoted per engine and converter — call 774-701-6374 for your price.

How the rebuild works

Core exchange is required — we rebuild your catalytic converter, so we need your core to complete the job.

  1. Get a quote. Tell us your machine’s model, engine, and serial, and we’ll reply with a price.
  2. Ship us your catalytic converter core (with tracking and insurance).
  3. We rebuild it with new internals, built to meet EPA emissions standards.
  4. We ship it back — usually within 3–5 business days of receiving your core.

Get your quote

Tell us your machine’s make, model, and engine and we’ll confirm we can rebuild the converter and give you a price.

Get your quote → or call 774-701-6374

Unsure whether your machine has a rebuildable catalyst? See DOC vs DPF vs SCR — which do you have? or our catalytic converter rebuild program.