Pump Assembly - Generac Power Systems MAGNUM Owner's Manual

Maintenance
2
1
1. Shaft key
2. Lip seals (3)
3. Shims
4. Frame
5. Breather
6. O-ring (sleeve)
7. Mechanical seal oil reservoir
8. Backplate
9. Volute gasket
10. Impeller key
11. Impeller

Pump Assembly

Each mechanical seal has its own particular
1.
assembly procedures. Refer to
Install the backplate.
2.
Use new gaskets. In case of an emergency
3.
situation where you need to reuse the old gaskets,
verify the gaskets are moist and flat.
Install the impeller key and impeller. For solids
4.
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
48
5
4
3 6
21 20
22 19
Figure 4-3. 6 Inch Pump Cross-Section
Wear Rings.
7
9 10
8
11
15
2
18
16
17
12. Priming chamber
13. Wear ring
14. Impeller lockscrew
15. Impeller washer
16. Impeller shims
17. Mechanical seal
18. Shaft sleeve
19. Pump end bearing
20. Shaft
21. Drive end bearing
22. Engine bracket
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.
After installing the impeller, remove the long
5.
capscrew and replace with the impeller lockscrew
with the impeller washer. The impeller lockscrew
should always be new. Refer to table
Torque Values
Install the volute, sliding it carefully over the
6.
register. Bolt the volute to the backplate.
Owner's Manual for Dry-Prime Diesel Trash Pumps
12
13
14
002308
for torque requirements.
Lockscrew