Product Manual

48 Owner’s Manual for Dry-Prime Diesel Trash Pumps

Maintenance

Figure 4-3. 6 Inch Pump Cross-Section

Pump Assembly

1. Each mechanical seal has its own particular

assembly procedures. Refer to Wear Rings.

2. Install the backplate.

3. Use new gaskets. In case of an emergency

situation where you need to reuse the old gaskets,

verify the gaskets are moist and flat.

4. Install the impeller key and impeller. For solids

handling pumps, install the impeller shims to

maintain 0.030 inch (.76 mm) minimum clearance

between the backplate and impeller backvanes.

Use the a long capscrew and several washers to

press on the impeller. Do not use the impeller

lockscrew. The threads must be long enough to

enter the shaft approximately eight threads or eight

turns by hand. This is necessary to protect the

threads in the shaft.

5. After installing the impeller, remove the long

capscrew and replace with the impeller lockscrew

with the impeller washer. The impeller lockscrew

should always be new. Refer to table Lockscrew

Torque Values for torque requirements.

6. Install the volute, sliding it carefully over the

1. Shaft key 12. Priming chamber

2. Lip seals (3) 13. Wear ring

3. Shims 14. Impeller lockscrew

4. Frame 15. Impeller washer

5. Breather 16. Impeller shims

6. O-ring (sleeve) 17. Mechanical seal

7. Mechanical seal oil reservoir 18. Shaft sleeve

8. Backplate 19. Pump end bearing

9. Volute gasket 20. Shaft

10. Impeller key 21. Drive end bearing

11. Impeller 22. Engine bracket

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