Kubota KX040 DOC Rebuild

New England Supply House rebuilds the diesel oxidation catalyst (DOC) on the Kubota KX040 — send us your core and we’ll rebuild it with new internals, built to meet EPA emissions standards, for a fraction of OEM cost.

How the rebuild works

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

Get a quote and place your order. Tell us your machine’s model, engine, and serial. We’ll reply with a price and set up your order.
Get your converter to us. Choose drop-off or shipping — drop-off is by appointment at our Foxboro shop, or ship it to us from anywhere in the country with tracking and insurance. We’ll send instructions with your order. We rebuild your unit with new internals, built to meet EPA emissions standards.
Back to work in 1–2 days (typically). Standard turnaround is 1–2 business days from receiving your core. Need it sooner? Ask about expedited service.

Fits the Kubota KX040

The Kubota KX040-4 is a 4-ton mini excavator powered by a Kubota 03-series (V2403) diesel with a diesel oxidation catalyst (DOC) and a DPF. We rebuild the DOC; the DPF is cleaned separately. Confirm your machine is a Tier 4 build (roughly 2014 and newer); pre-Tier 4 and the smallest sub-25 hp units have no rebuildable catalyst. Not sure what your machine has? Call 774-701-6374 with your engine model and serial and we’ll confirm before you ship.

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

Why rebuild instead of buying new

	New OEM converter	NESH rebuild
Cost	Full dealer price	Save vs. OEM
Turnaround	Often weeks via a dealer	~1–2 business days after we get your core
Emissions	OEM	Built to meet EPA emissions standards
Backing	Manufacturer	Warranty against manufacturing defects

Get your quote

Get your quote → or call 774-701-6374