JMP Marine Caterpillar 4255412 Replacement Pump JPR-CT0440
This is a JMP Marine raw-water pump (JMP part JPR-CT0440), built as a 100% plug-and-play replacement for the genuine Caterpillar pump it replaces below. It is designed for Caterpillar C4.4 engines and Perkins M92B engines, and ships complete with a bronze cam liner, a marine-grade non-magnetic 3X Series shaft, a long-life mechanical seal, and a high-performance impeller (7400-01K) already fitted.
This pump replaces Caterpillar 4255412 / 425-5412, Jabsco 29630-1201, Perkins W100006 (and can possibly replace Jabsco 29630-1101 — confirm drive gear tooth count matches before substituting). Parts are internally compatible with the genuine Caterpillar pump with one exception: if you are servicing an original Caterpillar pump housing rather than swapping in this complete unit, use Caterpillar mechanical seal part 4204328 in place of the JMP mechanical seal (MCSSET0008) supplied with this pump.
Key Features
- 100% compatible, plug-and-play replacement
- Long-life mechanical seal
- Heavy-duty marine-grade casting
- Heavy-duty bronze cam liner
- Marine-grade 3X Series non-magnetic shaft
- High-performance impeller
- High volume flow capacity
- Fast flow velocity
Applications
- Caterpillar C4.4 engines and Perkins M92B engines
Specifications
- Weight: approx. 8.75 lbs (4.0 kg)
- Drive gear teeth: 33
- End cover screws: 4
- Impeller part number: 7400-01K
- Major service kit: JSK0143
- Minor service kit: JSM0143
- Mechanical seal note: use Caterpillar seal p/n 4204328 when servicing an original Caterpillar pump housing (not the JMP seal supplied with this complete pump)
- Replaces: Caterpillar 4255412 / 425-5412, Jabsco 29630-1201, Perkins W100006 (and can possibly replace Jabsco 29630-1101 — confirm drive gear tooth count matches before substituting)
Frequently Asked Questions
Q: Will this fit my engine if it isn't listed under Applications?
Send us a picture of the pump plate on your engine's raw-water pump and the CLR Marine team will confirm fitment before you order.
Q: Why does the drive gear tooth count matter?
The drive gear must mesh correctly with your engine's timing gear train — an incorrect tooth count will cause the pump to run at the wrong speed or fail to engage, so always confirm the tooth count against your original pump before ordering.
Q: Is this a genuine Caterpillar part or an aftermarket replacement?
This is a JMP Marine aftermarket raw-water pump, built as a 100% plug-and-play replacement for the genuine Caterpillar pump it lists here — it is not a Caterpillar-branded part.
Q: Can I use this pump's mechanical seal to service my original Caterpillar pump?
No. If you are servicing an original Caterpillar pump housing rather than replacing the whole unit, use the Caterpillar mechanical seal listed under Specifications, not the JMP mechanical seal supplied with this pump.
Not sure this is the right part? Send us a picture of the pump plate on your engine and the CLR Marine team will confirm the correct part.
CLRMarine
