Dragon Wholesaling 178 Series Anweisungen für Installation, Betrieb und Wartung - Seite 10

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are not torn or otherwise damaged.

General: All parts should be clean before assembly. This is especially important for retaining

rings and O-ring grooves, threads, gasket surfaces, bearings, and bearing surfaces. Any burrs

should be removed with crocus cloth.

Assembly

To reassemble the pump, follow the disassembly instructions in reverse order. New gaskets

should be used throughout. Gaskets should be 1/16 inch thick and should be made of a material

suitable to the pump operating conditions.

1. Install the bearings in the pedestal.

2. Install new grease seals in the bearing caps.

3. With the impeller installed on the shaft and rigidly keyed in place, insert the shaft from the

front through the shaft hole in the wear plate. Feed on parts in the following order:

Water Slinger

Front Bearing Cap

Bearing Cap Gasket

Front Eccentric Lock Washer

Then feed the shaft through the front and then rear bearing and add the remaining parts in

the following order:

Rear Eccentric Lock Washer

Rear Bearing Cap Gasket

Rear Bearing Cap

Impeller Adjustment with the Casing Off the Pump

1. Push the rear against the shoulder with the rear bearing cap.

2. Push the impeller back against a 0.020 inch shim between the rear impeller pump-out vanes

and the front of the wear plate.

3. Push the rear bearing in again to be sure it is against the shoulder. Lock the bearing eccentric

lock ring in the direction of rotation.

4. Tighten the set screw in the eccentric lock.

Impeller Adjustment with the Casing On the Pump

1. Put on the casing with the casing gasket and tighten the casing stud nuts uniformly.

2. Push the shaft forward until the impeller hits the casing. Mark the shaft. Pull the shaft back

until the impeller hits the wear plate. Mark the shaft again.

3. The shaft should be set halfway between the shaft marks so that the clearance

between the impeller and the casing is approximately the same as the distance between the

impeller and the wear plate.

4. Make sure the rear bearing is seated against the pedestal shoulder and then lock it against

the shaft with the bearing eccentric lock ring. The lock ring should be set in the same direction

of rotation as the shaft. Lock the ring with the set screw.

5. The front bearing should not seat against the housing shoulder. The bearing should be

free to float along with the shaft to compensate for expansion and contraction of caused by

temperature changes. The outer race clearance is about 1/16 inch on each side. Push the

bearing in until it seats against the shoulder and pull it out 1/16 inch.

6. Lock the front bearing to the shaft in the same manner as the rear bearing.

Packing the Pump

1. Make sure the box is cleaned of all old packing and the plastic lantern ring.