Davey Silensor SLL400 Mechanical Seal

The Davey Silensor SLL400 pool pump takes a mechanical seal for a 5/8″ shaft, and this CapacitorsNZ seal replaces Davey part number 49771SP. The same seal is listed for the Silensor SLL150, SLL200 and SLL300 and the Silensor SLS75, SLS100, SLS150, SLS200 and SLS300. If the pump has been repaired before, compare the old seal with the photos before fitting.

Which pumps use the same seal as the Davey Silensor SLL400

Check the pump label first. On the Davey Silensor SLL400 the model code reads SLL400 or SLL 400.

This seal, which replaces Davey 49771SP, is shared with several other Davey pumps. We list it for the Davey HS50, Davey HS60, Silensor SLL150, Silensor SLL200, Silensor SLL300, Silensor SLS75, Silensor SLS100, Silensor SLS150, Silensor SLS200 and Silensor SLS300. It also suits the Davey HS60-08 and ProMaster, which don’t have their own pages yet.

The same seal is sold on its own as our seal to suit Davey HS50, HS60, Silensor and ProMaster pumps.

Signs the Silensor SLL400 seal is on its way out

A leaking shaft seal is worth fixing early. Water that tracks along the shaft into the motor end is a common reason pool pump motors lose their bearings.

• drips or a steady weep from the gap between the pump housing and the motor
• white mineral crust or rust streaks below the motor end
• the pump drawing air at the motor end or struggling to hold prime (other suction-side leaks can cause this too)

Fitting a new seal to the Silensor SLL400

Turn the power off at the wall and the switchboard, then separate the motor from the wet end and remove the impeller to reach the old seal. Clean the seat recess thoroughly. Press the new stationary seat in square using even finger pressure, and don’t touch either sealing face with bare fingers. Wet the rubber parts with clean water or a little soapy water rather than grease or oil, and keep the sealing faces clean. Never run the pump dry once it is back together, because even a short dry run can overheat and damage new seal faces.

If the run capacitor is also due, the Silensor SLL400 service kit packs this seal with the 25 µF (25 uF / 25 MFD) capacitor. Seals 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 SLL400 capacitor guide.

What seal fits a Davey Silensor SLL400?

The Davey Silensor SLL400 uses a mechanical seal for a 5/8″ shaft. This CapacitorsNZ seal replaces Davey 49771SP.

What is the Davey part number for the Silensor SLL400 seal?

The Davey reference for the Silensor SLL400 mechanical seal is 49771SP. Our aftermarket seal is made to replace it.

Do other Silensor pumps use the same seal as the SLL400?

Yes. We list the same 5/8″ seal, replacing Davey 49771SP, for the Silensor SLL150, SLL200 and SLL300 and the SLS75, SLS100, SLS150, SLS200 and SLS300, as well as the Davey Silensor SLL400.

What shaft size is the Davey Silensor SLL400 seal?

The seal for the Davey Silensor SLL400 suits a 5/8″ shaft. Measure the shaft where the seal sits if you're unsure.

Can I replace just the seal on my Silensor SLL400?

Yes. The seal on a Davey Silensor SLL400 can be changed on its own without replacing the motor, as long as the bearings are still quiet and the shaft is not scored where the seal runs.

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.