Weinman 135671 Impeller Kit for Size 4Q S Frame, 375 and 575 Series
The Weinman 135671 is the genuine Weinman impeller kit for size 4Q, S frame on 375 and 575 Series back pull out pumps. The impeller is the only part that adds energy to the liquid - the driver spins it, the vanes throw water outward, and the casing turns that velocity into the pressure you read at the discharge.
A physical strike is the other common reason. Debris through the suction chips or bends a vane, the rotating assembly goes out of balance, and the shaft seal and bearings then carry a load they were never designed for. Once that has happened the impeller is not something to straighten and reuse.
Fit it with a new casing seal and check the shaft seal while the rotating element is out. This kit covers size 4Q, S frame, and on a back pull out pump the casing stays on the pipework - so the awkward part of the job is already done once the element is withdrawn.
Key Features
- Genuine Weinman factory impeller kit for size 4Q, S frame
- Supplied with the impeller key, retaining screw and washer
- Restores the running clearance that erosion opens up
- Returns flow and discharge pressure toward the original curve
- For Weinman 375 close coupled and 575 frame mounted pumps
- Back pull out design keeps the pipework undisturbed
Applications
- Weinman 375 and 575 Series back pull out pump rebuilds
- Recovering flow and head that have fallen away slowly
- Replacing an impeller with eroded or chipped vanes
- Repairing cavitation pitting on the vane faces
- Restoring balance after a foreign object strike
- HVAC, hot water, commercial building and municipal systems
Specifications
- Brand: Weinman
- Manufacturer: Crane Pumps and Systems
- Manufacturer Part Number: 135671
- Part Type: Impeller kit
- Size: size 4Q, S frame
- Fits: Weinman 375 and 575 Series back pull out pumps
- Condition: New
Frequently Asked Questions
Q: How do I know the impeller is what is costing me flow?
Rule out the easy causes first: a partly closed or blocked suction, air leaking into the suction line, and a driver turning the wrong way after rewiring. If those are clear and the pump still will not make its numbers, internal clearance is the usual answer.
Q: Can I fit a larger impeller to get more pressure?
Only within what the pump and driver were designed for. A bigger impeller draws more power, raises axial thrust on the bearings and can push the casing past its rating. Stay with what Weinman lists for your model.
Q: Is the old impeller worth repairing?
On very large pumps with long lead times, weld build-up and re-machining is sometimes done. At this size it rarely pays, because vane profile and balance both have to be restored properly and the labour costs more than the kit.
Q: Do I need to reset any clearance after fitting?
Yes. The axial position of the impeller relative to the casing is set during assembly on these pumps, and the Weinman procedure for your model gives the figure. Guessing it away is a common reason a rebuilt pump underperforms.
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 impeller kit before you order.
CLRMarine
