Product Manual A

Maintenance
54 MTP4000-6000DZV/DZD Operating Manual 31609 A
2. Remove the impeller lockscrew with a breaker bar. Do not use an impact wrench. Make sure to apply steady
and even torque to break lockscrew loose. Allen head tooling to remove the lockscrew should be in excel-
lent condition. Discard the lockscrew. Remove the impeller washer. Refer to Figure 21 and Figure 22.
Figure 21 - 4 Inch Pump Cross-Section
3. Remove any flush lines to the seal gland. Remove the gland capscrews evenly until capscrews are free of
the backplate.
4. Space wedges in pairs 180° apart between the impeller and backplate. Be sure the wedges are placed
along impeller vanes. Tap opposed wedges at the same time to force off the impeller. Use extreme care to
avoid damage to impeller, shaft and bearings. Remove the impeller and impeller key.
5. Unbolt and remove the backplate from the bracket. Remove the mechanical seal.
1. Shaft key 11. Wear ring
2. Lip seals (3) 12. Priming chamber
3. Shims 13. Impeller lockscrew
4. Frame 14. Impeller washer
5. Breather 15. Mechanical seal
6. Mechanical seal oil reservoir 16. Pump end bearing
7. Backplate 17. Shaft
8. Volute gasket 18. Drive end bearing
9. Impeller key 19. Engine bracket
10. Impeller
1
2
3
4
5
6
7
8
11
12
1314
15
216
17
19
18
9
10
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