21
3500/4500 “BH” Pumps (See Figure 14.1)
21. Remove two locknuts (F) from square head bolts (G) securing seal retainer (9) to backplate (6A, B). Remove
the seal retainer (9).
22. Remove drive shaft (32) by sliding it out from case side of backplate.
23. Remove packing washer (18) and triple lip seal from backplate (6A, B) by prying out.
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. Triple lip seal
must be replaced anytime it is removed from backplate.
3500/4500 “HB” AND 3522 “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 seal retainer (9) to backplate (6A, B). Remove
the seal retainer (9).
28. Remove drive shaft (32) by sliding it out from case side of backplate.
29. Remove packing washer (18) and triple lip seal from backplate (6A, B) by prying out.
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. Triple lip seal
must be replaced anytime it is removed from backplate.
3600/4600 “BH” Pumps (See Figure 14.1)
31. Remove two locknuts (F) from square head bolts (G) securing packing gland (14) in place. Remove packing
gland clip (13) and packing gland (14).
32. 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.
33. Remove drive shaft (32). Clean drive shaft and adjacent parts. Examine drive shaft. Replace drive shaft if
excessively worn or scored.
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 pump is disassembled and reassembled.
3600/4600 “HB” AND 3622 “SBFO” Pumps (See Figure 14.2)
35. Remove retaining ring (3) from backplate (6A, B).
36. Loosen setscrews in ball bearing (2). Remove ball bearing.
37. 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).
38. 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.
39. Remove drive shaft (32). Clean drive shaft and adjacent parts. Examine drive shaft. Replace drive shaft (32)
if excessively worn or scored.
40. 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.
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