Yamada K225-AM Air Motor Repair Kit for NDP-20 / NDP-25
The Yamada K225-AM 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-AM KIT
- 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: How often does a pump need a rebuild kit?
There is no fixed interval - it depends on duty cycle, fluid chemistry and air quality. Rebuild at the first sign of reduced flow, product at the muffler, or erratic cycling rather than waiting for a full failure.
Q: Can I rebuild the pump without removing it from the line?
In most installations yes, provided the air and fluid lines can be isolated and disconnected at the pump, though it is easier to work on a bench.
Q: How do I know this is the right kit for my pump?
Match the kit number to the exact model and suffix on your pump nameplate. Yamada wet-end kits are matched to a specific body material and diaphragm elastomer combination, and the wrong kit will not seal correctly.
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.
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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