DPS TS-200 Manuale di istruzioni - Pagina 4

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Disassembly and Assembly

Front Cover Wear Plate Removal

The wear plate is easily accessible and may be serviced by removing the front cover assembly

Before attempting to service the pump remove the pump casing drain plug and drain the

pump.

Clean and reinstall the drain plug.

Remove the tighten handles and pull front cover and assembled wear plate from the pump

casing.

Inspect the wear plate, and replace if scored or worn. To remove the wear plate, undo the nut.

Inspect the front cover o-ring and replace if worn or damaged.

Check Valve Removal

If the check valve assembly requires to be serviced, remove the check valve pin and reach

through the front cover opening and remove the complete assembly from the suction flange.

Rotating Assembly Removal

The rotating assembly may be removed without disconnection of the suction and discharge

piping; however the engine and spacer coupling and stubshaft must be removed to provide

clearance.

The impeller should be loosened whilst the rotating assembly is still mounted to the pump

casing.

Before loosening the impeller, remove the seal cavity drain plug (square headed) and drain the

seal lubricant. This will prevent the oil in the seal cavity escaping when the impeller is

loosened. Dispose of seal oil lubricant in accordance with your local regulations.

Clean and reinstall the seal cavity drain plug. Remove the impeller cap-screw and washer

NOTE: do not remove the impeller until the rotating assembly has been removed from the

pump casing.

Remove bolt and washer holding the rotating assembly to the pump casing.

Separate the rotating assembly by pulling straight out of the pump casing

Removing the Impeller

With the rotating assembly removed from the pump casing, unscrew the impeller from the

shaft.

Beware when unscrewing the impeller; tension on the shaft seal spring will be released as the

impeller is removed.

Inspect the impeller for damage or wear and replace if necessary.

Seal Removal

Slide the integral shaft sleeve and rotating portion of the seal off the shaft as a unit.

Use a pair of stiff wires with hooked ends to remove the stationary element and seat.

An alternate method of removing the stationary seal components is to remove the screws and

separate sealing seat and sealing washer from bearing housing.

Position the seal plate on a flat surface with the impeller side down.

Press down on the back of the stationary seat until the seat, o-rings and stationary element

can be removed.

A new seal assembly should be installed anytime the old seal is removed from the pump.