Yamada 709812 Air Motor Body for NDP-20 to NDP-32
The Yamada 709812 is the genuine air motor body for NDP-20, NDP-25 and NDP-32 Series pumps. It belongs to the air motor - the mechanism that takes a steady supply of compressed air and turns it into the reversing push and pull that drives the two diaphragms.
Symptoms of a worn air motor are easy to mistake for a diaphragm fault, so it is worth being systematic: a pump that stalls but has no product at the muffler is almost always an air side problem, while product at the muffler points at a split diaphragm. Chasing the wrong one wastes a rebuild.
Key Features
- Genuine Yamada replacement air motor body
- Fits NDP-20, NDP-25 and NDP-32 Series pumps
- One per pump
- Part of the air distribution system that cycles the pump
- Machined to the factory specification for correct valve timing
- Direct replacement, no modification or adjustment required
Applications
- NDP-20, NDP-25 and NDP-32 Series pumps
- Air motor overhauls and rebuild work
- Curing stalling, hesitation or continuous exhaust
- Service after moisture or debris has entered the air supply
- Scheduled preventive maintenance on hard working pumps
- Marine, industrial and transfer duty
Specifications
- Brand: Yamada
- Manufacturer: Yamada America
- Manufacturer Part Number: 709812
- Part Type: Air Motor Body
- Fits: NDP-20, NDP-25 and NDP-32 Series pumps
- Quantity Used: One per pump
- Series Port Size: 1 in on the NDP-25 Series
- Condition: New
Frequently Asked Questions
Q: Can I replace one air motor part on its own?
You can, but if the assembly is open it is worth renewing the gaskets, seal rings and springs at the same time. They are inexpensive and reaching them is the expensive part.
Q: Why does the pump exhaust continuously without cycling?
Air is crossing between passages that should be isolated - a failed gasket, a worn seal ring or a valve face that is no longer flat.
Q: Does air pressure affect how long the air motor lasts?
Yes. Running at more pressure than the duty needs increases impact and wear throughout the motor, so set the regulator to the lowest pressure that gives the flow you need.
Q: The pump stalls at the end of a stroke. Where do I start?
Check whether there is product at the muffler. If there is, a diaphragm has split. If there is not, the fault is on the air side - a tired spring, a worn seal ring, a blown gasket or a scored valve face.
Not sure this is the right part? Send us a Picture of the Pump Plate on your pump and the CLR Marine team will confirm the correct air motor body.
CLRMarine
