Dragon Wholesaling 178 Series Kurulum, Çalıştırma ve Bakım Talimatları - Sayfa 9

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It is best to inject water into the lantern ring from an external source when pumping drilling

mud. This will keep most of the solids out of the packing. PACKING AND SHAFT LIFE WILL BE

INCREASED UP TO 500%. Also, water leakage from the packing will not be as objectionable as

mud.

PART IV- MAINTENANCE

Disassembly

The fluid end of the pump is so constructed that those parts subject to wear may be readily

replaced in the field. To replace the casing, wear plate, and impeller, the following procedures

should be followed.

1. Stop the pump and drain all the lines leading to the pump.

2. Loosen the bolts at the suction and discharge flanges of the pump and move the pipe clear

of the pump casing. Remove the pump from the system.

3. Separate the coupling and loosen the coupling half mounted to the pump shaft.

4. Remove the casing stud nuts and remove the casing.

5. Loosen the packing gland nuts and swing the packing gland bolts clear of packing gland.

Remove the packing gland.

6. Slide the water slinger along the shaft away from the bearing cap.

7. Loosen the bearing cap bolts on both ends and slide the bearing caps along the shaft.

This will expose the bearings, which are locked to the shaft by an eccentric locking ring and

set screw.

8. Loosen the bearing set screw and tap the bearing locking ring with a punch and a small

hammer so that it turns in the direction opposite to that of the shaft. When the bearing locking

ring has turned 1/4 revolution the bearing is freed from the shaft. Both bearings must be

released. File off any upset caused by the collar set screw before attempting to slide the shaft

through the bearings.

9. Remove the impeller and shaft from the pedestal, thus freeing the lantern ring, water slinger,

bearing caps, bearings, stuffing box and couplings.

10. Remove the impeller nuts and washer.

11. Remove the lantern ring and packing.

12. Remove the wear plate by using the jack bolts in the stuffing box. The wear plate is pressed

into the stuffing box and forms the bottom of the stuffing box.

13. The bearings may now be removed from the pedestal for inspection by tapping lightly with a

wooden or brass rod.

Inspection

Impeller:

Replace if impeller shows excessive erosion (especially on the pump-out vanes on

the back of the impeller), corrosion, extreme wear, or vane breakage.

Shaft: Check for runout to see that the shaft has not been bent. If runout exceeds 0.002 inch,

replace the shaft. Bearing seats and oil seal area must be smooth and free of scratches or

grooves. Shaft threads must be in good condition. Replace shaft, if necessary.

Ball Bearings: Replace if worn, loose, or rough and noisy when rotated. New bearings should

not be unwrapped until ready for use. Replacement bearings must be of the proper size and type

as supplied with the original equipment.

Seals: It is recommended that all O-ring and gasket seals be removed during disassembly and

replaced. In those cases where new seals are not available, the old ones can be reused if they