Viking Pump N323A

Bracket and Bushing Installation

Install bracket bushing with groove at 12:00 o’clock position if applicable.

Install bracket and bushing assembly on the casing ensuring proper alignment with locating pin.

Coat rotor shaft assembly with light oil and insert into bracket bushing.

Coat idler pin with light oil and place idler and bushing on idler pin in head.

Head and Idler Assembly Installation

Install head and idler assembly on pump using a .010 to .015 inch thick head gasket.

Ensure pump is not running and power is locked out

Loosen set screws and rotate bearing housing clockwise until it stops

Mark the outside diameter of the bearing housing and the bearing bracket

Rotate bearing housing counter clockwise past the mark by specified distance

Rotate the rotor shaft by hand to ensure it turns freely

Carefully remove valve cap, which covers adjusting screw.

Loosen locknut to unlock adjusting screw.

Install a pressure gauge in discharge line for actual adjusting operation.

Record the initial pressure reading from the gauge.

Turn adjusting screw in to increase pressure and out to decrease pressure.

Record the adjusted pressure reading from the gauge.

Mark valve and head before disassembly to ensure proper reassembly

Measure and record length of extension of adjusting screw

Loosen locknut and back out adjusting screw until spring pressure is released

Remove bonnet, spring guide, spring and poppet from valve body

Clean and inspect all parts for wear or damage

Ensure all pressure in the chamber has been vented through appropriate openings or connections.

Lock out or make non-operational the driving means to prevent starting during maintenance.

Identify the liquid handled by the pump and understand necessary safety precautions.

Obtain and review the material safety data sheet (MSDS) for the liquid.

Remove any circulation tubing connected to the seal gland.

Loosen setscrews on the seal collar to free the cartridge seal from the shaft.