Oberdorfer N202M-15 Bronze Flexible Impeller Pump — Direct Replacement for Universal 301357
If you've been running a Universal engine with a Kubota diesel block — whether it's an M12, M18, M25, M25XP, M30, M40, or M50 — and you need a reliable cooling pump replacement, the Oberdorfer N202M-15 is the pump that drops right in. It's the direct replacement for Universal part number 301357, built to the same exacting standards your engine demands, but with the added confidence of Oberdorfer's well-established reputation for quality bronze pump manufacturing.
What makes this pump stand out beyond just being a replacement part is how it's built. The N202M-15 is constructed from corrosion-resistant bronze with a high-chrome nickel stainless steel shaft — materials chosen for long service life in demanding environments. The full-cam design, 5-bolt mounting flange with male tang shaft, and vertical 3/8-18 FNPT inlet and outlet ports are all engineered for a straightforward, secure installation. Dual seals protect both the main pump body and the flange mounting, and a convenient drain plug makes routine servicing quick and clean. When it's time to swap the impeller, the design makes that easy too — this pump is built to be serviced rather than thrown away.
Key Features
- Full cam design machined directly into the pump body (integral cam, post-2004 production)
- Corrosion-resistant bronze pump body construction
- High-chrome nickel stainless steel shaft for long service life
- 5-bolt mounting flange with male tang shaft drive
- Neoprene impeller standard (nitrile/Buna impeller available by special order)
- Two independent seals — one on the main pump, one on the flange mounting
- Vertical 3/8-18 FNPT inlet and outlet ports (ports point upward)
- Convenient drain plug for easy maintenance
- Self-priming at low and high speeds — will not air lock
- Smooth, pulsation-free flow with no metal-to-metal pumping action
- Designed for easy impeller replacement and full serviceability
- Direct replacement for Universal part number 301357
- Note: Mounting gasket p/n 298485 sold separately
Applications
- Universal M12 (Kubota Z-500) diesel engines
- Universal M2-12 diesel engines
- Universal M18 (Kubota Z-400) diesel engines
- Universal M25 and M25XP diesel engines
- Universal M30 (Kubota D1101 / D1102) diesel engines
- Universal M40 diesel engines
- Universal M50 (Kubota V-1902) diesel engines
- Engine cooling and raw water circulation systems on Kubota-block diesel engines
- Industrial and agricultural equipment using compatible Kubota diesel powerplants
- Any application currently using Universal pump part number 301357
Specifications
- Part Number: Oberdorfer N202M-15
- Replaces: Universal 301357
- Pump Type: Flexible impeller pump, engine-mounted, pump end only
- Construction: Corrosion-resistant bronze body; high-chrome nickel stainless steel shaft
- Cam Type: Full cam (machined integral)
- Mounting: 5-bolt flange with male pilot; male tang shaft
- Port Size: 3/8"-18 FNPT inlet and outlet (vertical, ports point upward)
- Impeller Material: Neoprene standard (nitrile/Buna optional)
- Seal Type: Buna lip seal; two separate seals (main pump and flange)
- Flow Rate: Up to 11 GPM
- Maximum Shaft Speed: 3,500 RPM
- Maximum Pressure: 26 PSI
- Suction Lift: Up to 15 feet (fully primed)
- Temperature Range: 45°F to 180°F (7°C to 82°C) — neoprene impeller
- Repair Kit (basic): p/n 10725 (impeller, lip seals, retaining ring, O-ring, paper gasket)
- Repair Kit (with bearing): p/n 11691
- Major Service Kit: Oberdorfer N202M-15MJK
Frequently Asked Questions
Q: Is the Oberdorfer N202M-15 a true direct replacement for Universal 301357, or will modifications be required?
The N202M-15 is a direct drop-in replacement for Universal 301357 with no modifications required. It uses the same 5-bolt mounting flange, male tang shaft, and 3/8" FNPT port configuration as the original pump. Note that the mounting gasket (p/n 298485) is sold separately and should be replaced at installation.
Q: Does this pump work on non-marine Kubota diesel engines, such as those used in industrial or agricultural equipment?
Yes. While many listings reference marine applications, the Oberdorfer N202M-15 is suitable for any application using compatible Universal series or Kubota-block diesel engines, including industrial generators, agricultural machinery, and other power equipment using these engine families.
Q: What happens if the pump runs dry — will it be damaged immediately?
Flexible impeller pumps rely on the liquid being pumped for lubrication. Running dry, even briefly, will cause the neoprene impeller to degrade rapidly. On initial startup, the pump must be primed to avoid dry-running. Once primed, the pump is self-priming and will re-prime on its own.
Q: Can I replace just the impeller instead of the whole pump?
Absolutely. The N202M-15 is fully serviceable. Basic repair kit p/n 10725 includes the impeller, lip seals, retaining ring, and cover plate gaskets. The major kit (N202M-15MJK) covers a more comprehensive rebuild. Oberdorfer designs this pump to be restored to like-new condition rather than replaced outright.
Q: What is the difference between the old-style and new-style cover plates on this pump?
Older cover plates (p/n 6597) have a raised casting on the outside and seal with a paper gasket. Newer cover plates (p/n 6597B, approximately post-2003) are smooth on both sides and seal with an O-ring seated in the pump body. Repair kit 10725 includes both an O-ring and a paper gasket so it is compatible with either cover plate style.
Q: Is a nitrile (Buna) impeller available if my application involves fluids incompatible with neoprene?
Yes. A nitrile/Buna impeller (p/n 8514) is available by special order for applications where neoprene is not suitable. Contact your Oberdorfer distributor for availability.
Q: What is the maximum temperature the pump can handle?
With the standard neoprene impeller, the N202M-15 is rated from 45°F to 180°F (7°C to 82°C). Operating with water colder than 45°F is possible but will shorten impeller life. The pump body itself — bronze construction — is rated for significantly higher temperatures; the impeller material is the limiting factor.
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