Roper G12-436 instruction

3700/4700 “GHBO,” “GHB,” and “BHB” Pumps (Standard Mechanical Seal) (See Figure 7.1)

28.Place drive gear (34) into case bore. Install key (B) in keyway of drive shaft (32). Slide drive shaft into bore of drive gear.

29.Place appropriate number of case gaskets (20) on backplate side of case (19A, B, C, D). 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).

30.Install retaining ring (12) on drive shaft (32).

31.Carefully remove all burrs and sharp edges from shaft over which rotating element of seal will slide.

32.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 element are together.

33.Install lip seal (5) in backplate (6A, B).

34.Install retaining ring (4) on drive shaft (32).

35.Install ball bearing (2) on drive shaft (32) and into backplate (6A, B) using retaining ring (3) to secure ball bearing

(2) in place. The fit between drive shaft and ball bearing may be a light press fit. DO NOT damage seal parts while pressing ball bearing on drive shaft.

36.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).

37.Install spacer (47).

38.A.) For 3700/4700 “GHB” gear reduction unit, follow steps 19 – 27.

B.) For 3700/4700 “BHB” hydraulic drive assembly, go to Section 5, INSTRUCTIONS FOR ASSEMBLY OF A TYPE “BHB” HYDRAULIC DRIVE, in the following pages.

3700/4700 “GHBO,” “GHB,” and “BHB” Pumps (Positive Drive Mechanical Seal) (See Figure 7.1)

39.Place drive gear (34) into case bore.

40.Install retaining ring (12) on drive shaft (32) to locate mechanical seal.

41.Carefully remove all burrs and sharp edges on shaft over which the rotating element of seal will slide.

42.Apply a compatible lubricant to seal I.D. and O.D. of drive shaft (32).

43.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.

44.Slide faceplate end of drive shaft (32), with mechanical seal attached, into backplate (6A, B) through bore for ball bearing.

45.Place appropriate number of case gaskets (20) on backplate side of case (19A, B, C, D). 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) using two washer head cap screws (K) and eight hex head cap screws (L).

46.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.

47.Install lip seal (5) in backplate (6A, B).

48.Install retaining ring (40) on drive shaft (32).

49.Install ball bearing (2) on drive shaft (32) and into backplate (6A, B) using retaining ring (3) to secure ball bearing

(2) in place. The fit between drive shaft and ball bearing may be a light press fit. DO NOT damage seal parts while pressing ball bearing on drive shaft.

G12-436 specifications

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