5.If the pump works against an initial load for a long enough period of time, the thermal overload switchmay shut off motor. If this occurs, allow pump to cool (for approximately 10 minutes] and re–startpump without a load. Once the pump is in operation, reconnect tubing to equipment to be evacuatedor pressurized and continue operation.6.Ensure that the temperature in which the pump is to be operated is above 40 “F, otherwise the unitwill not function.CAUTIONThis pump is not explosion proof, therefore observe the necessaryprecautions in areas where explosion hazards may be present and/orwhen using combustible liquids or vapors In conjunction with theoperation of the pump.M A I N T E N A N C EUnder normal operating conditions, and employing proper handling and maintenance procedures, theMillipore Vacuum/Pressure Pump should provide many hours of trouble–free operation. However, it iswise to observe the following recommendations and instructions to achieve the best results with this unit.1.Unless advised in specific instances, do not lubricate any of the parts with oil, grease or petroleumproducts, or clean with acids, caustics, or chlorinated solvents. Although well protected with anArmalon cover, be careful to keep the diaphragm from contacting any petroleum product ofhydrocarbons. It can affect the service life of the pump.2.If a drop in vacuum or pressure is observed after many hours of operation, it may be due to a partialclogging of the polyurethane filters. To clean or replace the filters (and/or the rubber gasket) removethe two gauges from the top plate. Next, remove the five phillips screws.The filters (3) and gasket are located beneath the top plate in the pump head. Remove the filters andwash with 1, 1, 1, tricloroethane (chlorothene) and/or blow off and replace, when dry, in correctposition. If damaged, replace with new units from Service Kit. Clean the Hypalon gasket with water;dry, and replace in proper postion.3.To replace the diaphragm, remove the four socket cap screws from the head of the pump. Thediaphragm is held in place by two phillips head screws. Remove screws, retainer plate, and thediaphragm. The diaphragm will fit in any postion on the connecting rod. Replace the plate and thetwo phillips head screws, Torque to 30 inch–pounds.CAUTIONDo not raise any burrs or nicks on the heads of these screws. Theseburrs could cause damage to the inlet valve.4.To replace the inlet and/or outlet leaf–valve, remove the slotted machine screw that holds eachvalve in place. The stainless steel inlet and outlet valves are interchangeable. Clean them withwater. When replacing the outlet valve, note that there is a retaining bar near the machine screwhole. This retaining bar holds the valve in position. When replacing the inlet valve, note that thevalve holder is marked with an X in one corner. This X should be in the lower right hand cornertoward the inlet of the-air chamber. Replace the head and tighten the socket head screws to100 inch-pounds of torque.3
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