Yamada 711703 Ball Guide, stainless steel for NDP-25
The Yamada 711703 is a factory ball guide used in NDP-25 Series pumps with stainless steel wet ends. Without it the ball would be free to wander in the chamber, arrive back on the seat off center, and hammer the sealing face out of shape.
Because the guide, ball and seat form one check valve assembly, they are best treated as a set. Fitting a new ball and seat under a worn guide simply means the new parts are held in the wrong geometry from the first stroke.
Key Features
- Genuine Yamada replacement ball guide
- Material: stainless steel
- Fits NDP-25 Series pumps with stainless steel wet ends
- 4 per pump in a standard pump build
- Keeps the check ball captive and centered over its seat
- Replace together with the balls and seats
Applications
- NDP-25 Series pumps with stainless steel wet ends
- Wet end rebuilds and liquid side overhauls
- Replacing a cracked or eroded guide
- Restoring even check valve wear
- Service after abrasive or solids laden duty
- Marine, industrial and chemical transfer applications
Specifications
- Brand: Yamada
- Manufacturer: Yamada America
- Manufacturer Part Number: 711703
- Part Type: Ball Guide
- Material: Stainless steel
- Fits: NDP-25 Series pumps with stainless steel wet ends
- Quantity Used: 4 per pump
- Series Port Size: 1 in on the NDP-25 Series
- Condition: New
Frequently Asked Questions
Q: How much ball lift is correct?
Enough to pass full flow and no more. That is what the guide sets, which is why guides are specific to the model and are not interchangeable between pump sizes.
Q: Can I run the pump without a guide?
No. The ball will not reseat consistently, output will be erratic and the seat will be hammered out of shape quickly.
Q: Does the guide material have to match the wet end?
It should be compatible with the fluid and with the temperature. Yamada supplies guides in materials matched to each wet end build for exactly that reason.
Q: How often should guides be replaced?
Inspect at every liquid end service and replace when the ball contact points are visibly worn or any opening has eroded. On abrasive duty that is often every second ball and seat change.
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 ball guide.
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