Viking Positive Displacement Pump G4124B

Ensure initial packing adjustment is made carefully

Is the packing gland over-tightened?

Does the inspection reveal the need for packing gland adjustment?

Does the inspection reveal the need for packing replacement?

Contact Viking Pump® representative for Engineering Service Bulletin ESB-521 regarding repacking pump

Ensure pump ports are square and in proper position

Shim or move the pump as required

Is piping forced to line up with the ports?

Flexible Coupling Alignment Check

Remove any coupling guards or covers

Check alignment of the coupling halves using a straightedge

Check alignment using a long straightedge or tightly drawn string across the face of the sheaves

Ensure all safety measures are in place before opening the pump chamber

Removal of Component Mechanical Seal

Insert brass or plastic bar through port opening to keep shaft from turning

Bend up tang of lockwasher and remove locknut and lockwasher from shaft

Loosen set screws in the face of the bearing housing and remove the bearing housing assembly

Remove the pair of half round rings under the inner spacer collar from the shaft

Loosen nuts and remove seal holder, seal seat and seal gasket(s)

Loosen setscrews in mechanical seal rotary member

Did the idler slide off the idler pin during removal?

Is the idler bushing worn beyond moderate wear?

Is the idler pin worn beyond moderate wear?

Refer to TSM for procedure in removing head of the pump

Ensure idler does not slide off the idler pin during head removal

Ensure pressure in the chamber is completely 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.

Carefully remove valve cap covering the adjusting screw.

Loosen locknut to allow pressure setting adjustment.

Install a pressure gauge in the discharge line.