Norton DR520, Owner'S Manual

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I. OPERATING AND MAINTENANCE INSTRUCTIONS
(GAST MODEL DOA-V185A-AA)
Do not at any time lubricate any of the parts with oil, grease, or petroleum products nor clean with acids, caustics or
chlorinated solvents. Be very careful to keep the diaphragm from contracting any petroleum product or hydro
carbons. It can affect the service life of the pump.
Danger: To prevent explosive hazard, Do NOT pump combustible liquids or vapors with these units.
Personal Injury and/or Property Damage would result.
To replace the diaphragm, remove the socket cap screws from the head of the pump. The diaphragm is held in
place by two Phillips head screws. Remove screws, retainer plate, and the diaphragm. The diaphragm will fit in any
position on the connecting rod. Replace the plate and the two Phillips head screws. Torque to 30 inch-pounds on
DOA and DAA. torque to 12 inch-pounds on MOA and MAA.
Caution: Do not raise any burrs or nicks on the heads of these screws. These burrs could cause damage to
the inlet valve.
For replacing the inlet and outlet valve, remove the slotted machine screw that holds each valve in place. The
stainless steel inlet and outlet valves are interchangeable.* Clean them with water. When replacing the outlet valve,
place the new valve in location and note there is a retaining bar near the machine screw hole. This retaining bar
holds the valve in position. When replacing the inlet valve, note that the valve holder is marked with an X in one
corner. This X should be in the lower right hand corner toward the inlet of the air chamber. Replace the head and
tighten the socket head screws to 90-100 inch-pounds of torque on DOA and DAA Torque to 30 Inch-pounds on
MOA and MAA. *DOA and DAA models only.
WARNING-The motor may be thermally protected and can automatically restart when the overload resets.
Always disconnect power source before servicing. Personal Injury and/or Property Damage could result.
Do not attempt to replace the connecting rod or motor bearings. If after cleaning the unit and/or installing a new
Service Kit, the unit still does not operate properly, contact your representative, the factory , or return the pump to
one of the GAST authorized Service Centers.
IF YOUR PUMP IS EQUIPPED WITH PLASTIC PLUGS IN THE EXHAUST AND/OR INTAKE PORTS, REMOVE
BEFORE STARTING UNIT.
WIRING INFORMATION
For any D.C. unit-red lead goes to positive side of power source.
For any permanent split capacitor motor which has four leads(4) leads is
as follows:
Brown leads to capacitor.
Black leads to Power Source.
For any permanent split capacitor for DOA & DAA motor which has (3)
leads is as follows: Figure 3
DO NOT ATTEMPT AT ANY TIME TO REMOVE THE CONNECTING ROD OR COMPLETELY
DISASSEMBLE THE PUMP. IF IT DOES NOT GIVE YOU THE PROPER SERVICE EVEN AFTER
INSTALLING A NEW SERVICE KIT, PLEASE RETURN IT TO ONE OF THE AUTHORIZED GAST
SERVICE CENTERS LISTED IN THE SERVICE CENTER PAGES.
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