Viking Pump N323E

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 the pump is not running and all power to drive the pump is locked out

Loosen the two set screws in the outer face of the bearing housing

Rotate the bearing housing clockwise until it cannot be turned anymore

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

Rotate the bearing housing counter clockwise past the mark by 6.09 in. (155 mm) or 9.09 in. (231 mm)

Contact local Viking representative for additional end clearance if operating at higher temperatures or viscosities

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.

Remove the two gland nuts and slide the cartridge seal out through the bearing housing opening.

Ordering parts for pressure relief valve

Provide model number and serial number of pump

Specify pressure setting when ordering springs

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

Lock out or make non-operational the driving means (motor, turbine, engine, etc.).

Identify the liquid the pump has been handling and understand the necessary safety precautions.

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

Mark head and casing before disassembly to ensure proper reassembly.

Remove nuts from head and use jackscrews to back head away from casing.

Avoid damaging head gasket and prevent idler from falling from idler pin.