Davey Silensor SLL150 Mechanical Seal

The mechanical seal to suit the Davey Silensor SLL150 pool pump is a shaft seal for a 5/8″ shaft that replaces Davey part 49771SP. This CapacitorsNZ seal is an aftermarket replacement, not a Davey part. The same seal is also listed for the Silensor SLL200, SLL300 and SLL400, the Silensor SLS75, SLS100, SLS150, SLS200 and SLS300, and the Davey HS50 and HS60.

Which Davey pumps use the same seal as the Silensor SLL150

The seal that replaces Davey 49771SP is shared across several Davey pumps. Each of these has its own listing: Davey Silensor SLL200, Davey Silensor SLL300, Davey Silensor SLL400, Davey Silensor SLS75, Davey Silensor SLS100, Davey Silensor SLS150, Davey Silensor SLS200, Davey Silensor SLS300, Davey HS50 and Davey HS60.

It is also listed for the Davey HS60-08 and the Davey ProMaster, which don’t have their own pages. The same part is sold on its own as our pump seal to suit the Davey HS50, HS60, Silensor and ProMaster.

Signs the Davey Silensor SLL150 seal is leaking

A mechanical seal has a spring-loaded rotating face on the shaft that runs against a stationary seat in the pump body. When those faces wear, chip or dry out, water gets past them.

• Drips or a damp patch where the pump wet end meets the motor.
• Rust or white mineral streaks running down beneath the motor.
• A puddle under the pump that keeps coming back after you dry the area.

Fitting the Silensor SLL150 seal

Confirm the pump first: look for the model code SLL150 (also written SLL 150) on the label. Then isolate the power and close the valves before opening the pump. To reach the seal you separate the wet end from the motor and remove the impeller; the rotating half of the seal sits on the shaft behind it and the seat sits in the housing.

Measure the shaft where the seal runs: 5/8″ is about 15.9 mm. Press the new seat in squarely, keep fingers and grease off the polished faces, and use water or a little soapy water as an assembly lubricant. Prime the pump before switching on after fitting, as running dry can quickly damage new seal faces. Check the size of your old seal against the new one before you start. If the motor has also been slow to start, the Silensor SLL150 service kit pairs this seal with a run capacitor, and kits for other Davey pumps are on our Davey service kits page.

Before you order

Check the old part before fitting: match the size of your old seal.

Capacitor details for this pump: Davey Silensor SLL150 capacitor guide.

What seal fits a Davey Silensor SLL150?

A mechanical seal for a 5/8″ shaft that replaces Davey 49771SP. This CapacitorsNZ seal is an aftermarket replacement to suit the Silensor SLL150.

What is the Davey part number for the Silensor SLL150 seal?

The Davey seal number for the Silensor SLL150 is 49771SP. This seal replaces 49771SP; it is not made by Davey.

Does the Silensor SLL200 use the same seal as the SLL150?

Yes. The Silensor SLL200, SLL300 and SLL400 are listed with the same 49771SP-type seal as the SLL150, for example the Silensor SLL200 seal. Check the size of your old seal before fitting.

Is the Davey Silensor SLS seal the same as the Silensor SLL150 seal?

Yes, the Silensor SLS75, SLS100, SLS150, SLS200 and SLS300 are listed with the same 49771SP-type seal as the Silensor SLL150, as are the Davey HS50 and HS60. Check the size of your old seal before fitting.

What shaft size is the Davey Silensor SLL150 seal?

The Silensor SLL150 seal suits a 5/8″ shaft, which is about 15.9 mm. Measure the shaft where the old seal sits to confirm.

Can I replace just the seal on a Silensor SLL150?

Yes, the seal can be changed on its own on a Silensor SLL150. If the pump has also been slow to start, the Silensor SLL150 service kit adds a run capacitor for less than buying both separately.

What if it doesn't fit?

If you're unsure, send us a photo of your old part and the pump's label before ordering.