27
26
23
3
2
1
22
External bypass
opening—1/2" NPT
4
5
6
25
11
7
8
9
10
11
17
16
15
14
13
18
19
20
21
12
24
Material Code
A Buna-N
B Neoprene
®b
Ref
No.
Part No. Description Qty.
1. 2592 Key—1/8" sq. x 9/16" 1
2. 3442 Pipe plug—1/4" NPT 1
3. 2468-1 Case 1
4. 2492-X Rotor and shaft assembly 1
5. 2491 Sideplate 2
6. 2296-1X_6
a
Seal assembly 2
7. 2595 Seat location pin 2
8. 2472 Head 2
9. 2-15 4_
a
Case O-ring 2
10. 2471
d
Roller bearing 2
11. 5000-112 Retainer ring 4
12. 2451-2 Carbon vane 8
13. 2590
c
Flush plug—1/8" NPT 1
14. 2760-53 Retainer ring 1
15. 2589 Stem seal 1
16. 2585 Relief valve plug 1
17. 2590 Flush plug—1/8" NPT 1
18. 2584-X Adjusting stem assembly 1
19. 2587
c
Outer relief valve spring 1
20. 2586
c
Inner relief valve spring 1
21. 2588 Relief valve 1
22. 2591 Nameplate 1
23. 2594 Base 1
24.
2158 Grease zerk—1/8" NPT 2
2159 Lubricap #2 (not shown) 2
Ref
No.
Part No. Description Qty.
25. 7002-025NC062A Bolt socket head 12
26. 7002-010NC050A Bolt socket head 3
27. 7012-006SF019E Nameplate screw 2
Appendix E—Parts Details for Model F51 (Frame Mount)
WARNING
CAUTION: Always relieve pressure in the
unit before attempting any repairs.
a
_ denotes material code. See material chart for details.
b
Registered trademark of the DuPont company.
c
The pump relief valve is installed at the factory to operate as an external
bypass through the 1/2" NPT hole back to the storage tank. To change from
this external configuration to an internal relief valve, remove relief valve plug
2585 and relief valve springs 2586 and 2587. Then remove flush seal plug
2590 and plug the 1/2" NPT opening. Replace the relief valve plug and
springs. In this case a separate external bypass valve must be used in the
piping between the pump discharge and the storage tank. Set the internal
valve at a pressure slightly above the setting on the external valve. Use only
the outer relief valve spring 2587 for units with 1/3 hp motors. Use both
springs for 1/2 hp motors and larger. Always replace the flush seal plug 2590
that screws into the relief valve plug 2585 after any relief valve adjustment.
d
Bearing replacement: Install roller bearing 2471 with open side of grease
seals toward outside of pump as shown below.
29
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