Compact & Utility Tractor DOC Rebuild

New England Supply House rebuilds the diesel oxidation catalyst (DOC) on compact and utility tractors — 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 compact have a rebuildable DOC?

The dividing line is DEF. Compact and utility tractors under about 100 hp meet Tier 4 with EGR plus a diesel oxidation catalyst (DOC) and no SCR/DEF — that DOC is rebuildable. Higher-hp row-crop tractors, and all combines and self-propelled sprayers, use SCR+DEF, which isn’t a rebuildable catalyst. Simple test: if your tractor doesn’t take DEF, it has a rebuildable DOC.

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.