Specifications

3700/4700 “”HB” and 3722 “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 seal retainer (9) to backplate (6A, B).
Remove seal retainer (9).
38. Remove drive shaft (32) along with mechanical seal (11) and retaining ring (12) from backplate (6a, b).
39. 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.
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.
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.
9. BEARING REMOVAL AND INSTALLATION
BEARING REMOVAL
Pump bearings are available in bronze, iron, carbon, and glass/graphite impregnated PTFE. Any of these bearings
may be removed using a Snap-On

tool puller, part number CG45. This tool may be purchased through your local
tool dealer or through Roper Pump Company. If you do not have this bearing puller, any of the bearings may be
removed by using a hacksaw blade to cut through the bearing in two places 180° apart. This procedure will usually
loosen the bearing enough to be pulled out. If this procedure is used, take care to prevent damage to the bore into
which the bearing is pressed.
Carbon bearings may also be removed by carefully chipping the bearing out with a chisel. Take care not to scar the
endplate bores during the bearing removal process.
WARNING
DO NOT chisel bearings
without wearing proper
safety glasses.
After removing the bearings, always check the endplate bores for nicks and burrs caused by the removal process.
The bores must be clean, smooth, and free of burrs before attempting to install new bearings.
24