22
3700/4700 “BH” Pumps (See Figure 14.1)
41. Remove two locknuts (F) from square head bolts (G) securing seal retainer (9) to backplate (6A, B). Remove
the seal retainer (9).
42. Remove drive shaft (32) along with mechanical seal (11) and retaining ring (12) from backplate (6A, B).
43. 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.
44. 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.
3700/4700 “”HB” and 3722 “SBFO” Pumps (See Figure 14.2)
45. Remove retaining ring (3) from backplate (6A, B).
46. Loosen setscrews in ball bearing (2). Remove ball bearing.
47. Remove two locknuts (F) from square head bolts (G) securing seal retainer (9) to backplate (6A, B). Remove
seal retainer (9).
48. Remove drive shaft (32) along with mechanical seal (11) and retaining ring (12) from backplate (6a, b).
49. When removing following type 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 fro 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.
50. 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.
John Crane is a registered trademark of John Crane Inc.
Pac-Seal
is a registered trademark of Pac-Seal Inc.
Sealol is a registered trademark of EG & G Sealol.
To Next Page
Loading...
