VSS 10-12
OVERVIEW OF OPERATION
Liquid is drawn from the tank and through the suction strainer by a positive displacement
diaphragm pump. Excess flow returns to the tank through a pressure regulator. The
returning flow provides agitation in the tank.
When the lever is in the bypass position, (See photos 9 and 11) the fluid returns to the tank
under no restriction, therefore the system is at very low pressure. Move the lever to the
bypass position when starting and shutting down the engine, when priming the pump, and
when maximum agitation is desired. All spraying is done when the lever is in the spray
position. (See photos 10 and 12)
Operating pressure is adjusted by turning the plastic knob on the regulator clockwise to
increase pressure and counter-clockwise to decrease pressure. Pressure is only achieved
when the lever on the regulator is in the spray position. (See photos 10 and 12)
It is important that all fittings on the suction side of the pump, particularly the suction
strainer, remain tight. Otherwise, the pump can draw air into the system and that will affect
performance. The pump fittings are sealed with O-rings and should not be over-tightened.
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