U.S. Seal PS-3986 extra heavy duty shaft seal assembly for 3/4 inch shaftsU.S. Seal Shaft Seal Assembly, 3/4" Shaft, Extra Heavy Duty, Saltwater/Ozone Pools, PS-3986 In stock$2699
U.S. Seal PS-3986 extra heavy duty shaft seal assembly for 3/4 inch shafts
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U.S. Seal Shaft Seal Assembly, 3/4" Shaft, Extra Heavy Duty, Saltwater/Ozone Pools, PS-3986

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$2699
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Quick overview

  • Built for salt and ozone An extra heavy duty seal specified for saltwater pools and ozone systems, which are hard on ordinary seal faces.
  • Three quarter inch shaft Sized for a 3/4 inch motor shaft.
  • Listed for Baker-Hydro and Waterco The pumps this assembly is called out for.
  • Complete assembly Supplied as the seal assembly, both halves together.
  • The part that stops the drip A weeping pump between the motor and the wet end is almost always the shaft seal.
  • Do it with the impeller off The seal is only reachable with the impeller removed, so change it whenever the wet end is open.
Full description and specifications ↓

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Product details

The U.S. Seal PS-3986 is an extra heavy duty shaft seal assembly for 3/4 inch shafts, specified for saltwater and ozone pools. It is listed as fitting Baker-Hydro and Waterco pumps, and appears in some listings as U.S. Seal Pump Seal 601.

Why the duty rating matters

A shaft seal runs with its two faces pressed together and a film of water between them. Salt and ozone are hard on the elastomers and the faces, and a standard seal in a salt pool will simply not last as long. The extra heavy duty version uses materials chosen for that service.

Recognizing a failed seal

The classic symptom is water dripping from the gap between the motor and the pump body. Left alone it runs back along the shaft into the motor, rusts the bearings and turns a seal job into a motor replacement. If you see rust streaks on the motor face under the seal plate, the seal has been leaking for a while.

Fitting

The seal sits behind the impeller, so the wet end has to come apart to reach it. That makes it worth changing whenever the pump is open for any other reason.

From Pool School

How to Prime a Pool PumpFrom the breaker to a full pot, each manufacturer's time limit, and what to check when it won't catch prime. Read Replace the Pool Pump Motor or the Whole Pump?The manufacturers' tests first, what each repair replaces, and the federal motor rule. Read
Specifications
Brand U.S. Seal
Manufacturer part number PS-3986
UPC 852661157261
Type Shaft seal assembly
Shaft size 3/4"
Duty Extra heavy duty
Application Saltwater and ozone pools
Fits Baker-Hydro, Waterco
Also listed as U.S. Seal Pump Seal 601, PS3986
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

What shaft size does it fit?
A 3/4 inch shaft.
Why a special seal for saltwater?
Salt and ozone attack ordinary seal materials faster. This is the extra heavy duty version specified for those systems.
Which pumps is it listed for?
Baker-Hydro and Waterco.
How do I know the seal has failed?
Water dripping from between the motor and the pump body, or a rusty motor face under the seal plate. That water is coming past the shaft seal and it will reach the motor bearings if it is left.
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