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72. Place appropriate number of case gaskets (20) on backplate side of case (19A, B, C, D, E). Align
backplate (6A, B) on dowel pins (J). Secure backplate to case using two washer head cap screws (K) and
eight hex head cap screws (L).
73. Install retaining ring (12) on drive shaft (32).
74. Carefully remove all burrs and sharp edges from shaft over which rotating element of seal will slide.
75. Lubricate drive shaft and mechanical seal bore with a compatible lubricant. Install mechanical seal (11) on
drive shaft and position seal back against retaining ring (12). Care must be taken not to nick o-ring. Be
sure lapped (polished) faces of stationary seal face and rotating elements are together.
76. Install ball bearing (2) on drive shaft (32) and into backplate (6A, B). The bearings are prelubricated and
do not require lubrication at time of initial installation. A small amount of grease will be required during
regular maintenance. Tighten setscrews in ball bearings (2) to secure bearing on drive shaft (32). Install
retaining ring (3) into backplate (6A, B) to secure ball bearing (2) to backplate (6A, B).
77. Place one square head bolt (G) through each slot in backplate (6A, B) and through each hole in seal
retainer (9). Secure seal retainer against backplate using two locknuts (F).
78. Install drive key (A).
79. Read and understand all safety instructions and warnings before installing and operating pump.
3700/4700 “HB” and 3722 “SBFO” Pumps (Positive Drive Mechanical Seal) (See Figure 15.1)
80. Place drive gear (34) into case bore.
81. Install retaining ring (12) on drive shaft (32) to locate mechanical seal.
82. Carefully remove all burrs and sharp edges on shaft over which rotating element of seal will slide.
83. Apply a compatible lubricant to seal I.D. and to O.D. of drive shaft (32).
84. Slide rotating element of mechanical seal (11) onto drive shaft (32) before removing three or four clips
that are taped to rotating element. Push rotating element back against retaining ring (12), tighten
setscrews in seal, and remove clips that are taped to seal.
85. Slide faceplate end of drive shaft (32) with rotating element of mechanical seal attached, into backplate
(6A, B) through bore for ball bearing (2).
86. Place appropriate number of case gaskets (20) on backplate side of case (19A, B, C, D, E). Install key (B)
in keyway of drive shaft (32). Slide drive shaft into bore of drive gear while aligning backplate (6A, B) on
dowel pins (J). Secure backplate (6A, B) to case (19A, B, C, D, E) using two washer head cap screw (K)
and eight hex head cap screws (L).
87. Lubricate o-ring on stationary seal face and seal chamber bore with a compatible lubricant. Slide
stationary seal face over keyway end of drive shaft (32) and down to seal chamber. Be sure lapped
(polished) face is toward rotating member of seal. Push stationary seal face into seal chamber.
88. Slide ball bearing (2) over drive shaft (32). Align setscrews in ball bearing (2) with groove in drive shaft
and tighten setscrews. The bearings are prelubricated and do not require lubrication at time of initial
installation. A small amount of grease will be required during regular maintenance.
89. Install retaining ring (3) into backplate (6A, B) to secure ball bearing (2) to backplate (6A, B).
90. Install antirotation pin (T) in locator ring (60).
91. Position locator ring (60) with antirotation pin (T) toward seal face. Align antirotation pin (T) with slot in
back of stationary seal face and pus into counterbore of backplate (6A, B).
92. Place one square head bolt (G) through each slot in backplate (6A, B) and through each hole in seal
retainer (9). Secure seal retainer against backplate using two locknuts (F).
93. Install drive key (A).
94. Read and understand all safety instructions and warnings before installing and operating pump.
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