Yamada 771727 Polypropylene Center Disk for NDP-50
The Yamada 771727 is a genuine Yamada center disk, Polypropylene, used in NDP-50 series air-operated double diaphragm (AODD) pumps. It clamps the outer bead of the diaphragm to the center rod, transferring the reciprocating motion of the air side to the diaphragm on the wet side. It has to stay flat and true or the diaphragm will flex unevenly and fail early.
Genuine Yamada replacement parts are machined and molded to the original factory tolerances, so fit, alignment and seal engagement match the component being replaced. One or two per pump. Always compare the exact part number against your pump's nameplate before ordering, since Yamada varies internal components by both pump size and body material / elastomer combination.
Key Features
- Genuine Yamada replacement center disk
- Material: Polypropylene
- Fits NDP-50 series AODD pumps
- One or two per pump
- Molded or machined to factory tolerances for correct fit and seal engagement
Applications
- NDP-50 series AODD pump service and rebuilds
- Scheduled preventive maintenance
- Restoring lost flow, leaks, or erratic cycling
- Marine, industrial, chemical and wash-down service
Specifications
- Brand: Yamada
- Manufacturer: Yamada America
- Manufacturer Part Number: 771727
- Part Type: Center Disk
- Material: Polypropylene
- Fits: NDP-50 Series
- Condition: New
Frequently Asked Questions
Q: How do I confirm this is the correct part for my pump?
Match the part number to your pump's nameplate model and suffix, since Yamada varies this component by both pump size and body material across the model range.
Q: Does this part need to match the pump body material?
Yes. Mixing dissimilar materials in the wetted path can cause galvanic corrosion or chemical incompatibility, so match this part to the body material and elastomer combination already on the pump.
Q: What should I check before reassembling around this part?
Confirm mating surfaces are clean and undamaged, replace the gaskets or O-rings it seals against rather than reusing them, and torque fasteners to the factory sequence and spec rather than just snugging them down.
Q: What causes this kind of structural part to need replacement?
Wear from repeated contact with a moving component, corrosion or chemical attack from the pumped fluid, or physical damage from an impact or overtightened fastener during a previous rebuild.
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 center disk.
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