How to Winterize the Pump
a) If your pump has the Drain Back Feature
To winterize the pump, you need to drain it of water to prevent freezing which can cause damage to the
pump. The Bison Model 1900 Stainless Steel Pitcher Pump is equipped with special drain features inside
the pump body that allow water to drain from both above and below the piston (Detail G).
Step #1: Drain water from pump body
Before draining, remove the brass hose bibb cap or pressurizing check valve from the spout.
The Bison Pumps Drain Back Water Shut-off Valve and Drain Valve should be installed on the incoming
water line leading to the pump. See Detail J for the installation and operation of the drain back water
shutoff valve and drain valve. Close the drain back water shut-off valve. A hose can be attached to the
drain valve if desired. Open the drain valve by turning it counterclockwise (prepare a way to gather the
water coming out the drain valve).
Raise the handle to the upper most position (Detail G – Item A). The pump has now engaged the Drain
Valve and Drain Activator for the Piston Check Valve. This allows water to drain from above and below
the piston back to the water source. Hold the handle at its upper most position until all water drains
from the pump body.
Step #2: Lower handle to normal resting position
Now lower the handle to the standard resting position. Now the drain valve can be closed (turn
clockwise until tight).
Do NOT stroke the pump while the shut-off valve is closed. This may create a vacuum on the pump,
causing the handle to remain in an upright position.
b) If your pump does not have the Drain Back Feature
To winterize this pump, you must remove it from its mounting location.
Step #1: Turn OFF the water supply to the pump and disconnect the water source.
Step #2: Pump the handle to remove as much water as possible from the pump.
Step #3: Disconnect the pump from the mounting location.
Step #4: Disconnect the Rod Connector from the Handle.
Step #5: Remove the four screws from the Top Plate and pull the Top Plate/Piston
Assembly out of the pump body.
Step #6: Drain all water from the pump body.
Step #7: Inspect the Piston Assembly for any wear, etc. that may need to be addressed.
Model 1900 Owner's Manual Rev C
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