Viking Pump N324AH

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.

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

Rotate the bearing housing clockwise until it cannot be turned anymore

Ensure the rotor is touching the head and cannot be turned by hand

Make a mark on the outside diameter of the bearing housing and a corresponding mark on the bearing bracket

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

Identify the type of mechanical seal

Refer to the Seal Installation Drawing (SID) for unlisted seal types

Contact a Viking representative if necessary

Ensure the pump is turned off and isolated from the power source

Remove any obstructions around the seal area

Ensure all pressure in the chamber is completely vented

Lock out or make non-operational the driving means

Identify the liquid the pump has been handling and understand necessary 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