Viking Pump LQ4124AE

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

Rotate the bearing housing in a clockwise direction until it cannot be turned any more.

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

Make another mark on the pump bracket per 'Table 4' on page 14.

Rotate the bearing housing in a counter clockwise direction until the mark on the outside diameter of the bearing housing lines up with the second mark on the pump bracket.

Check end clearance with feeler gauge between idler and rotor faces, if possible.

Ensure the pump is stopped and isolated from the system.

Loosen the packing gland nuts evenly.

Adjust the packing gland nuts by tightening them evenly by 1/6 of a turn.

Check for leakage after adjustment. Is the leakage within acceptable limits?

Inspect the packing gland for further adjustment needs.

Determine if packing replacement is necessary.

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

Gather necessary tools and materials, including Light Refrigeration Oil and a container for old oil

Place a container under the reservoir to catch the old oil

Open the drain plug and allow the oil to completely drain out

Check for any metal particles or contaminants in the drained oil

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

Gather necessary tools and materials

Place the oil drain pan under the reservoir

Remove the drain plug and allow the oil to completely drain

Check the compatibility of the Light Refrigeration Oil with the Neoprene seal

Fill the reservoir with one pint of Light Refrigeration Oil

Remove valve cap covering the adjusting screw

Loosen locknut on the adjusting screw

Install a pressure gauge in the discharge line

Adjust the pressure setting by turning the adjusting screw

Close the discharge line beyond the pressure gauge

Limit the operation time to prevent rapid temperature rise

Record the maximum pressure shown on the gauge

Tighten the locknut and replace the cap gasket and valve cap