Dragon Wholesaling 178 Series Інструкції з монтажу, експлуатації та технічного обслуговування - Сторінка 10
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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.
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