Yamada K225-AP Air Motor Repair Kit for NDP-20 / NDP-25
The Yamada K225-AP is a genuine Yamada air motor repair kit for NDP-20 / NDP-25 series air-operated double diaphragm (AODD) pumps. It contains the wear parts on the air side of the pump - the seals, O-rings and gaskets in the pilot valve and main air valve assembly that shift air between chambers on every stroke.
Rebuilding the air motor restores crisp, reliable cycling and eliminates the continuous exhaust, stalling or hesitation that worn air-valve seals cause. Replace every part included in the kit in one pass rather than only the piece that has visibly failed, since the other seals in the same assembly have seen the same cycles and are close behind it.
Key Features
- Genuine Yamada air motor repair kit
- Fits NDP-20 / NDP-25 series pumps
- Includes air valve, pilot valve and piston seals, O-rings and gaskets
- Complete kit - no separate parts to source
Applications
- Air motor overhauls and preventive rebuilds
- Restoring lost flow, slow cycling or erratic operation
- Scheduled maintenance on hard-working pumps
- Marine, industrial, chemical and wash-down service
Specifications
- Brand: Yamada
- Manufacturer: Yamada America
- Kit Part Number: K225-AP
- Kit Type: Air Motor Repair Kit
- Fits: NDP-20 / NDP-25 Series
- Port Size: 3/4 in / 1 in
- Condition: New
Frequently Asked Questions
Q: Do I need to replace every part in the kit at once?
Yes, that is the point of a kit. Replacing only the failed component while leaving other worn seals in place is the most common reason a rebuilt pump needs attention again within weeks.
Q: What is included in an air motor kit?
An air motor (air side) kit includes the seals, O-rings and gaskets for the pilot valve and main air valve assembly, and often the pistons or diaphragm seal for the air chamber - the parts that wear from cycling, not from contact with the pumped fluid.
Q: What is included in a wet-end repair kit?
A wet-end kit typically includes both diaphragms, the check valve balls and seats, and the O-rings or gaskets that seal the liquid chamber and manifolds, everything needed to rebuild the fluid side of the pump in one pass.
Q: Will this kit work if my pump has the -PP suffix?
The -PP suffix denotes a specific pump variant, usually a polypropylene wetted-parts option, and needs the matching -PP kit. Check your pump nameplate against the exact kit number before ordering.
Not sure this is the right part? Send us a picture of your Pump Plate to https://www.clrmarine.com/Contact-Us and the CLR Marine team will confirm the correct repair kit.
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