Step #8: Let the inside of the pump dry and then spray Extra Virgin Olive Oil inside at the top of the
pump body. Reinstall the Piston Assembly and Top Plate. Reattach the Rod Connector to the Handle.
Step #9: Store pump in a dry location until needed for reinstallation.
Adding Food-Grade RV Antifreeze
In extreme freezing conditions the addition of a Food-Grade Antifreeze to the inside of the pump can
help ensure the safety of the pump’s internal components. Be sure to only use FOOD-GRADE RV
ANTIFREEZE inside the pump body.
To add Food-Grade RV Antifreeze, remove the four screws as described for the handle orientation
adjustment (Detail E – Item A). Grasp the handle and slowly raise it. Then rotate and pull the Top Plate
and Lift Rod with an upward motion. Once there is a sufficient opening (a couple of inches) add the
proper amount of Food-Grade Antifreeze per the manufacturer’s recommendation. Return the Top
Plate to its original position and replace the four top plate screws. The process is complete.
Dewinterizing
Be sure that the weather has warmed sufficiently before continuing with this process, assuming the
pump is not in a heated environment.
Step #1: Open water access
If the water source valve was closed during the draining operation, turn the valve on to allow the pump
to have access to water. If using the Bison Pumps Drain Back Water Shut-off Valve and Drain Valve,
open the drain back water shut-off valve and make sure the drain valve is closed.
Step #2: Pump water
If Food-Grade Antifreeze was added to the pump, then you should pump water until the color of the
Food-Grade Antifreeze is no longer visible.
Note: If you initially have difficulty moving the handle, you may need to warm the pump manually (with
your hands held on the side, for example). Do not force the handle to move as this could cause damage
to the seals.
Model 1900 Owner's Manual Rev C
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