Yamada 804697 Muffler for NDP-20, NDP-25
The Yamada 804697 is a genuine Yamada muffler, used in NDP-20, NDP-25 series air-operated double diaphragm (AODD) pumps. It quiets and directs the exhaust air leaving the air motor after each stroke. A clogged or damaged muffler restricts exhaust flow, which slows cycling and can make the pump stall under load even though the air supply is adequate.
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 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 muffler
- Fits NDP-20, NDP-25 series AODD pumps
- One per pump
- Molded or machined to factory tolerances for correct fit and seal engagement
Applications
- NDP-20, NDP-25 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: 804697
- Part Type: Muffler
- Fits: NDP-20, NDP-25 Series
- Condition: New
Frequently Asked Questions
Q: Do I need any other parts to complete this repair?
Depends on what you are replacing this alongside. Anything the pump was disassembled to reach - gaskets, O-rings, seals - should be replaced as a set rather than reused, even if this is the only part that visibly failed.
Q: What symptoms suggest this component needs replacing?
Erratic cycling, stalling, unusual noise from the affected area, or visible wear, play, or damage on inspection are the usual signs that a specific internal component needs attention.
Q: Is this a wear item or does it last the life of the pump?
That depends on the specific component, but as a rule any part that moves, reciprocates, or seals against another part should be inspected whenever the pump is opened for service and replaced if it shows wear, scoring, or play.
Q: Can I install this myself, or does it need a service technician?
Most Yamada AODD pump components are designed for field service with basic hand tools, following the torque sequence and reassembly order in the pump's maintenance manual.
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 muffler.
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