Specifications

17. Remove case gaskets (20) from opposite side of case (19A, B, C, D, E).
18. Remove two dowel pins (J) from opposite side of case (19A, B, C, D, E).
19. Remove drive key (A) from drive shaft (32).
20. A.) For 3600/4600 “BH” pumps, follow steps 21 – 24.
B.) For 3600/4600 “HB” and 3622 “SBFO” pumps, follow steps 25 – 30.
C.) For 3700/4700 “BH” pumps, follow steps 52 – 55.
D.) For 3700/4700 “HB” and “SBFO” pumps, follow steps 56 – 61.
3600/4600 “BH” Pumps (See Figure 14.1)
21. Remove two locknuts (F) from studs (AG) securing packing gland (14) in place. Remove packing gland
clip (13) and packing gland (14).
22. Remove packing rings (16) and packing washer (18). Remove lantern ring (17) if used. Packing hooks are
commercially available to assist in removal of packing rings.
23. Remove drive shaft (32). Clean drive shaft and adjacent parts. Examine drive shaft. Replace drive shaft if
excessively worn or scored.
24. Visually inspect all parts. Replace all worn or damaged parts before reassembling pump. It is
recommended that new gaskets (20, 22, 25) be installed each time pump is disassembled and
reassembled.
3600/4600 “HB” AND 3622 “SBFO” Pumps (See Figure 14.2)
25. Remove retaining ring (3) from backplate (6A, B).
26. Loosen setscrews in ball bearing (2). Remove ball bearing.
27. Remove two locknuts (F) from square head bolts (G) securing packing gland (14) in place. Remove
packing gland clip (13), packing gland (14), spring clip (15), and two square head bolts (G).
28. Remove packing rings (16) and packing washer (18). Remove lantern ring (17) if used. Packing hooks are
commercially available to assist in removal of packing.
29. Remove drive shaft (32). Clean drive shaft and adjacent parts. Examine drive shaft. Replace drive
shaft (32) if excessively worn or scored.
30. Visually inspect all parts. Replace all worn or damaged parts before reassembling pump. It is
recommended that new gaskets (20, 22, 25) be installed each time pump is disassembled and
reassembled.
3700/4700 “BH” Pumps (See Figure 14.1)
31. Remove two hex head cap screws (E) securing seal retainer (9) to backplate (6A, B). Remove seal
retainer (9).
32. Remove drive shaft (32) along with mechanical seal (11) and retaining ring (12) from
backplate (6A, B).
33. When removing following types of single seals (John Crane

Type 21, Type 8-1, Type 9; Pac-Seal

Type 21; Sealol

Type 43), clean and lubricate drive shaft (32) prior to removing mechanical seal making
sure that drive shaft is smooth and free from all burrs. Loosen
setscrews (if present) on mechanical seal.
Remove mechanical seal (11). Inspect sealing surfaces of stationary seal face and inspect rotation
element. Replace as required. Remove retaining ring (12) from drive shaft (32) if applicable.
34. Visually inspect all parts. Replace all worn or damaged parts before reassembling pump. It is
recommended that new gaskets (20, 22, 25) be installed each time the pump is disassembled and
reassembled.
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