Viking Pump RS323A

Lock out all power to the pump drive

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

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

Ordering parts for pressure relief valve

Provide model number and serial number

Specify pressure setting for springs

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.

Identify the type of mechanical seal

For other seal types, refer to the Seal Installation Drawing (SID) or contact a Viking representative

Is the new seal properly installed and secured?

Clean the work area after replacement