Yanmar 124770-42030 Pump Shaft for 3QM30
The Yanmar 124770-42030 is the genuine pump shaft for 3QM30 engines. It carries the drive from the engine into the impeller, and it is the surface the pump seals run on, which means its condition decides how long a set of seals will last.
A shaft is replaced for wear at the seal, for corrosion, or for damage at the impeller drive. The seal area is the one that matters most: once the lip has worn a groove into the shaft, a new seal has nothing flat to follow and will weep within hours. Run a fingernail along it - if you can feel a step, the shaft is finished as a sealing surface however good it looks.
Key Features
- Genuine Yanmar replacement pump shaft
- Fits 3QM30 engines
- One per pump
- Ground sealing surface for correct seal life
- Carries the drive from the engine into the impeller
- Renew the pump seals at the same time
Applications
- 3QM30 engines
- Raw water pump rebuilds
- Replacing a shaft grooved where the seal runs
- Repairing corrosion after salt water past a failed seal
- Restoring a worn impeller drive
- Spring commissioning and layup service
Specifications
- Brand: Yanmar
- Manufacturer: Yanmar Marine
- Manufacturer Part Number: 124770-42030
- Part Type: Pump Shaft
- Fits: 3QM30 engines
- Quantity Used: One per pump
- Condition: New
Frequently Asked Questions
Q: Why does the shaft corrode?
Salt water that has been past a failed seal sits against it. That is why a weeping seal is worth dealing with early rather than at the next service.
Q: Does the impeller drive matter?
Very much. A worn keyway or drive flat lets the impeller move on the shaft, which wears the vanes unevenly and eventually rounds off the drive altogether.
Q: Do I need special tools?
A press or a suitable puller makes the job straightforward. Driving a shaft in or out with hammer blows damages the bearing and the seal bores.
Q: How do I know the shaft needs replacing?
Run a fingernail along the area the seal runs on. Any ridge or groove you can feel means a new seal cannot follow it, and the pump will weep again quickly.
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 pump shaft.
CLRMarine
