
Installation and Operating Information
The Bosworth Company
5 Doc M-09-31-111516
The motor on your Guzzler G2‐0501N SapPuller Pump has a built‐in cooling fan to keep the motor from overheat‐
ing. Ensure that the motor has adequate airflow during operation or it will overheat. Even with adequate venti‐
lation, you may notice that the motor becomes uncomfortably hot to touch during pump operation. This is nor‐
mal. The surface temperature of the motor can become as hot as 175°F (~80°C) during pump operation. If the
motor overheats, an internal thermal sensor will shut the motor off. Should this happen, allow the motor to cool
before attempting to restart the pump.
If there is a risk of freezing conditions, we recommend that you disconnect the pump from your sap lines when
the pump is not running and drain any excess sap from the pump. Sap can freeze within the pump bodies or
lines. If this happens and the pump is turned on, it will result in damage to various pump components, including
pump bodies, valves, diaphragms and manifolds. We recommend flushing the pump (i.e., letting it pull a full vol‐
ume of water) and then draining it by tipping it over to remove any remaining water from the manifolds to help
prevent freezing.
To shut the pump down and disconnect it from the mainline, first turn the pump off. Then, close the shut‐off
valve to isolate and maintain some vacuum in the mainline. Then disconnect the pump from the mainline, using
Quick Couplers if you have used these for your pump‐to‐mainline connection. Turn the pump back on briefly to
flush any remaining sap from it. Finally, tilt the pump to drain out any remaining sap from the manifolds.
Over time, the elastomer components of the pump (i.e., the diaphragms and valves) will fail. Diaphragms tend to
develop a hole or tear. If that happens to one of the diaphragms in your twin diaphragm pump, the pump will
continue to develop vacuum as a result of the action of the remaining functional diaphragm, but the flow of sap
through the pump will be reduced by half of its normal volume. It will be apparent when a diaphragm fails, be‐
cause sap will leak from the diaphragm into the housing of the pump, draining out through either of the two
drain holes at the bottom of the pump housing. Your Guzzler G2 pump ships with two spare diaphragms. Direc‐
tions for changing a diaphragm are provided on page 6.
The design of the umbrella valves in your Guzzler G2 SapPuller pump features
a rubber valve with a flat round disk held under tension against a plastic plate
(the “valve stop”) that contains a number of holes or “pores”. (Figure 6)
When pressure is applied to one side of the valve stop, it pushes the rubber
disk away from the holes, like an umbrella turning inside out. (Figure 7)
When this happens, fluid or air can pass through the holes. When the pres‐
sure is reversed, the rubber disk is forced against the holes, making a tight
seal and preventing any fluid or air from passing.
If there is material (e.g., wood shavings from taps, plastic shavings from tubing, etc.) in the sap flowing through
the pump, this material may become lodged in the valve pores, preventing the rubber umbrella valve from seal‐
ing tightly against the valve stop. When this happens, the diaphragm working these valves will be unable to de‐
velop any vacuum. The result will be the same as if the diaphragm had developed a hole or tear; namely, the
flow rate of the Guzzler G2 SapPuller will be reduced by half, but this valve malfunction will not result in any leak‐
ing of sap into the pump housing. To correct the problem the valve should be removed, inspected and cleaned.
Several of the steps involved in doing this are the same as the steps required to change a valve. (Instructions on
changing valves are provided below.)
Rubber umbrella valve
Pores in umbrella valve
plasc valve stop; O‐
ring seated in groove
Figure 6 Umbrella valve ‐Closed Umbrella valve ‐Open
Figure 7