Bosch 0445020200 Common Rail Injection Pump for Kubota V2403-CR, D1803-CR and Cat C2.4

This is a brand new, genuine Bosch 0445020200 (0 445 020 200) common rail fuel injection pump, the high pressure supply pump fitted to Kubota’s V2403-CR and D1803-CR engines and the Kubota-built Caterpillar C2.4. It is the exact Bosch-manufactured unit that Kubota sells as part number 1J801-50500, complete with the integrated fuel pressure regulator, so it bolts on and runs with no modifications. If your machine is hard starting, losing rail pressure, or derating with low pressure codes, this pump is one of the most common failure points on these engines.

Owners search for this part in a lot of ways: as a Kubota V2403 injection pump, by the Kubota number 1J801-50500, or by the Cat number 477-7689. They all point to this same Bosch-built pump. And because Bosch builds it for Kubota, the Bosch-boxed unit is the identical component that ships in the Kubota box, usually at a significantly lower price. Call us for current pricing before you order elsewhere.

Application & Fitment

Bosch 0445020200 fits the following common rail engines:

• Kubota V2403-CR (including V2403-CR-EF03 and V2403-CR-TIE4BG-MLR1)
• Kubota D1803-CR (common rail versions of the D1803)
• Caterpillar C2.4

Typical equipment applications include:

• Kubota excavators: KX040-4, KX040-5, U48-5
• Kubota R430 wheel loader
• Kubota L series tractors: L3301, L3302, L3560, L3770 series, L3901, L4060, L4701, L4760, L4802, L5460, L6060
• Kubota MX series tractors: MX4800, MX5200, MX5400, MX5800, MX6000
• Kubota M5660 (reported fitment, please verify by serial number)
• Cat C2.4 powered machines, per aftermarket cross reference listings: 304.5E, 304E2 CR, 305E2 CR, 305.5E2 CR, 306, 307.5 and 307E2 mini excavators, plus 902C2, 903C2 and 903D compact wheel loaders

One important caveat on Cat minis: the 302.7D and 303E CR do not use this pump. The 302.7D runs a Yanmar engine and the 303E CR runs a Cat C1.3, so double check before ordering. Fitment can also vary by serial number range. As an authorized Kubota dealer, we can verify the correct pump against your engine model and serial number in minutes, so call before you buy if there is any doubt.

Cross-Reference Part Numbers

• Bosch: 0445020200 (0 445 020 200)
• Kubota: 1J801-50500, 1J801-50501, 1J801-50502 (revision levels of the same pump)
• Kubota factory reman: KEARP-1J801
• Caterpillar: 477-7689
• Alliant Power: BOS12120

Note: Bosch 0445020166 (Kubota 1J800-50501) is the earlier generation V2403-CR pump and is a different part number. If your old pump carries either number, call us and we will confirm the correct replacement.

Frequently Asked Questions

My old pump is stamped 1J801-50501 or 1J801-50502. Is this the right replacement?

Yes. Kubota uses the trailing digit to track revisions, so 1J801-50500, 1J801-50501 and 1J801-50502 are the same pump at different revision levels, and pumps sold under the -50500 number are frequently stamped -50501. Bosch 0445020200 is the current new replacement for all three.

Does this pump fit Cat mini excavators?

It fits machines powered by the Cat C2.4 engine, which is built on the Kubota V2403-CR, and it carries Cat part number 477-7689. Aftermarket cross reference listings show it on the 304.5E, 304E2 CR, 305E2 CR, 305.5E2 CR, 306, 307.5 and 307E2. It does not fit the 302.7D or the 303E CR, which use different engines. Send us your engine serial number and we will confirm before you order.

Will this fit an older mechanical V2403 or V2203?

No. Non common rail V2403 and V2203 engines, common in older Bobcat skid steers and compact excavators, use a Zexel in-line mechanical pump such as 104139-4151 (Kubota 1G796-51011 / 1G796-51012). That is a completely different pump. Not sure which engine you have? Call 530-668-0818 and we will identify it from your serial number.

Why do I see this pump cheaper online?
Short answer: it is usually not the same part — and a pump failure does not stay in the pump. Read why ↓

Search any OE number and eBay, Amazon and a dozen storefronts will show it well under dealer cost, sold by outfits with no name, no address and no phone number. We lose business to those listings every week — and we see a lot of them come back through our shop. Here is what is actually different.

• The part number proves nothing on its own. Counterfeit injectors and pumps are stamped with the same OE numbers as the real thing, in housings cast to look identical. The number in the listing title tells you what the seller claims it is, not what came off an OE line.
• “Remanufactured” is not a regulated word. A genuine reman unit is stripped to bare components, has its wear parts replaced — nozzle, plunger and barrel, solenoid, seals — and is then run on a calibration bench until it meets the original flow and response spec. A cheap one is very often cleaned, resealed, painted and shipped. Both get called remanufactured.
• No full teardown, so no idea what is worn. A proper rebuild means the unit comes apart completely and every part gets inspected and measured against spec — not just the ones that are obviously bad. Skip the teardown and you are reusing worn internals inside a freshly painted housing. It will run on the truck. It will not last.
• No factory-spec bench load testing. A unit is not finished until it has been run under load on a test bench and made its numbers across the range, not just at one easy point. That bench time is most of what you are paying for. Sellers working on price cut it first, because nobody can see it in a photo.
• The warranty has to be honored by someone. Everything we remanufacture in house carries a one-year warranty, with 30 days on electrical components. Parts we supply as an authorized dealer carry the manufacturer’s own warranty. Either way you call us, a real shop in California, and we sort it out. A marketplace warranty usually means shipping the part overseas at your own cost and hoping for a reply.
• No core program. We credit your rebuildable core back in full. Discount sellers generally will not take one, so the gap narrows the moment you account for the core you are now stuck holding.
• A pump failure does not stay in the pump. When a high-pressure pump comes apart it sends metal downstream through the rails, the lines and every injector. That is the whole reason fuel contamination kits exist. A pump that was never tested to spec is the cheapest possible way to buy that repair.

We are an authorized dealer and a working fuel-injection shop — we have been rebuilding and testing this hardware in Woodland since 1993, and the people who answer the phone are the people who run the benches. Not sure this is the right part for your engine? Call us with your serial number before you order and we will confirm it. Send your rebuildable core back and the core charge is refunded. And if a price somewhere else looks too good, call 530-668-0818 and we will tell you straight whether it is a deal or a problem.

Why Buy From Valley Fuel Injection

Valley Fuel Injection & Turbo has specialized in diesel injection since 1993. We are an authorized Kubota dealer in Woodland, California, and common rail repair is our daily work, so you are buying from a shop that installs, tests and troubleshoots these exact pumps, not a box mover. Every order is checked against your engine model and serial number before it ships, and our technicians are a phone call away if questions come up during installation. Need more than a pump? We provide complete diesel fuel injection services, from injector testing to full system diagnosis.

Pricing & Availability

Call 530-668-0818 for current pricing and availability. Have your engine model and serial number ready and we will confirm fitment on the spot. Prefer email? Send us a message and we will get right back to you.