Yamada 711612-4 C Spring
The Yamada 711612-4 is a factory c spring used in Yamada air operated double diaphragm pumps using this spring. It is a small part with a direct effect on how the pump runs, because the air motor is a timed mechanism and the spring is part of the timing.
Springs lose free length and lose rate. A spring that has relaxed no longer returns the valve firmly, so the shift becomes lazy and the pump hesitates at the end of the stroke, cycles unevenly, or stops altogether at low air pressure while running acceptably at high pressure. That pressure dependent behavior is a good clue that a spring rather than a seal is at fault.
Key Features
- Genuine Yamada replacement c spring
- Fits Yamada air operated double diaphragm pumps using this spring
- One per pump
- Provides the return force that times the air valve shift
- Restores clean, even cycling at low air pressure
- Direct replacement, no adjustment required
Applications
- Yamada air operated double diaphragm pumps using this spring
- Air valve and pilot valve overhauls
- Curing hesitation or uneven cycling
- Restoring reliable operation at low air pressure
- Service after moisture has corroded the air motor internals
- Marine, industrial and transfer duty
Specifications
- Brand: Yamada
- Manufacturer: Yamada America
- Manufacturer Part Number: 711612-4
- Part Type: C Spring
- Fits: Yamada air operated double diaphragm pumps using this spring
- Quantity Used: One per pump
- Condition: New
Frequently Asked Questions
Q: The pump only runs at high air pressure. Is the spring the problem?
It is a strong candidate. A weak spring needs more pressure to complete the shift, so the pump works when pushed hard and hesitates or stalls when the air is turned down.
Q: Should both springs be replaced together?
Yes where the pump uses a pair. Different rates on the two halves of the cycle give an uneven beat and uneven wear.
Q: What causes a spring to corrode?
Moisture carried in the compressed air. A filter and water trap on the air supply is the single most effective way to extend the life of every part inside the air motor.
Q: What happens if a spring breaks?
The valve loses its return and the pump usually stops mid stroke. The broken piece stays in the valve, so the assembly needs to be cleaned out as well as re-sprung.
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 c spring.
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