Yamada 771056 Gasket for NDP-20 to NDP-32
The Yamada 771056 is the genuine replacement gasket specified for NDP-20, NDP-25 and NDP-32 Series pumps. It goes between two machined faces and keeps the air passages behind them separate from each other.
Gaskets take a set in the shape of the joint and stick to one face, so they almost always tear on disassembly. Replacing rather than reusing is not a preference, it is the practical reality of opening the joint. Clean both faces back to bare metal before fitting the new one and check for scoring while the joint is open.
Key Features
- Genuine Yamada replacement gasket
- Fits NDP-20, NDP-25 and NDP-32 Series pumps
- One per pump
- Cut to the factory port pattern so air passages line up
- Restores a positive seal between machined faces
- Inexpensive part that prevents erratic running and stalling
Applications
- NDP-20, NDP-25 and NDP-32 Series pumps
- Air valve and pilot valve overhauls
- Chasing erratic cycling or a pump that stalls
- Reassembly after any joint in the air motor is opened
- Scheduled air motor service
- Marine, industrial and transfer duty
Specifications
- Brand: Yamada
- Manufacturer: Yamada America
- Manufacturer Part Number: 771056
- Part Type: Gasket
- 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: Does it matter which way round the gasket goes?
Yes. The holes match the port pattern of that joint and are often not symmetrical. Fitting one reversed blocks a passage and the pump will not cycle.
Q: Should I use sealant as well?
No. The joint is designed to seal on the gasket alone, and sealant squeezed into an air passage is a good way to create a fault that is very hard to find.
Q: How should the faces be prepared?
Clean both back to bare metal with a plastic scraper, then check for scoring across the joint. Do not use an abrasive disc, which dishes the face and creates the leak you are trying to cure.
Q: How often should gaskets be replaced?
Every time the joint is opened, and as a matter of course whenever the air valve or pilot valve is being serviced for a running fault.
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 gasket.
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