A Davey Silensor SLL300 pool pump takes a mechanical shaft seal for a 5/8″ shaft, and the Davey part number it replaces is 49771SP. This CapacitorsNZ seal is an aftermarket replacement for 49771SP, to suit the SLL300. The same seal is also listed for the Silensor SLL150, SLL200, SLL400, SLS75, SLS100, SLS150, SLS200 and SLS300 and the Davey HS50 and HS60, so one part covers several Davey pumps.
Davey Silensor SLL300 seal part number: 49771SP
If a parts diagram, a pool shop quote or the old seal packet gives you Davey 49771SP, this is the seal it replaces. It suits a 5/8″ shaft, which is the shaft size listed for the Silensor SLL300. On the pump label the model may be written as SLL300 or SLL 300. The Silensor SLL150, SLL200 and SLL400 are different models, but they take the same seal.
Before ordering, measure the shaft where the seal sits or compare your old seal side by side with the photos. A mechanical seal is a matched pair, so always fit both halves together rather than reusing the old seat.
Other Davey pumps listed with the 49771SP seal
The 49771SP replacement is shared across several Davey pumps, each with its own page: Silensor SLL150, Silensor SLL200, Silensor SLL400, Silensor SLS75, Silensor SLS100, Silensor SLS150, Silensor SLS200, 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 Davey HS50 / HS60 / Silensor / ProMaster pool pump seal. For other Davey models, see our Davey service kits and parts.
Signs the SLL300 seal has failed
A mechanical seal works by a spring pressing a rotating face on the shaft against a fixed seat pressed into the pump housing. Wear, sand, chemical attack or running the pump dry damages those faces, and water starts to get past.
- Drips or a wet patch under the join between the pump housing and the motor.
- Rust or white mineral streaks running down the motor end.
- Sometimes air drawn in around the shaft, so the pump struggles to hold prime.
- A gritty or squealing noise from the motor end once leaking water has reached the bearings.
Fitting the SLL300 seal
Turn off and unplug the pump, close the valves and drain it before separating the motor from the wet end. With the impeller off, press out the old seat and clean the bore so the new seat sits square. Wet the rubber parts with water or a little dishwashing liquid rather than grease, and keep fingers off the polished faces. Refill the pump with water before switching on, because even a short dry run can damage the new seal faces.
Before you order
Check the old part before fitting: match the size of your old seal.
Capacitor details for this pump: Davey Silensor SLL300 capacitor guide.