Roper G12-436 - Manual (Page 8)

D.) For 3700/4700 “GHBO” and “BHB” pumps, follow steps 54 – 61.
3600/4600 ‘GHB” Gear Reduction Unit (See Figures 7.1 and 7.2)
21. Drain oil from gear reduction unit.
22. Remove drive key (A). Remove four hex head cap screws (U) and slide seal retainer (37) assembled with lip
seal (39) off end of pinion shaft (42).
23. Remove seal retainer gasket (38) between seal retainer (37) and gear case (44).
24. Remove pinion shaft (42) assembly with ball bearing (41) and retaining ring (40).
25. Remove six hex head cap screws (W), twelve flat washers (X), and six lockwashers (Y).
26. Remove gear case (44). Remove gear case gasket (48).
27. Remove needle bearing (43). This bearing is installed with a press fit.
28. Remove retaining ring (45).
29. Remove drive gear (46). A gear puller may be necessary in removing gear, as a close fit is maintained between
gear and shaft.
30. Remove drive gear key (Z).
31. Remove four socket head cap screws (AD) securing cover (49) to backplate (6A, B). Remove cover gasket (50).
32. Remove spacer (47).
3600/4600 “GHBO” and “BHB” Pumps (See Figure 7.1)
33. Remove retaining ring (3) securing ball bearing (2) in place.
34. 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).
35. 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.
36. Remove drive shaft (32) along with ball bearing (2) and retaining ring (4) from backplate (6A, B).
37. Remove ball bearing (2) from drive shaft (32).
38. Remove retaining ring (4) from drive shaft (32).
39. Remove lip seal (5) from backplate (6A, B) and discard. It will be damaged during disassembly.
40. Clean drive shaft and adjacent parts. Examine shaft. Replace drive shaft if excessively worn or scored.
41. Visually inspect all parts. Replace all worn or damaged parts before reassembling pump. It is recommended that
new gaskets (20, 22, 25, if applicable, 38, 48, 50) and new lip seals (5, 39) be installed each time the pump is
disassembled and reassembled.
3700/4700 “GHB” Gear Reduction Unit (See Figures 7.1 and 7.2)
42. Drain oil from gear reduction unit.
43. Remove drive key (A). Remove four hex head cap screws (U) and slide seal retainer (37) assembled with lip
seal (39) off end of pinion shaft (42).
44. Remove seal retainer gasket (38) between seal retainer (37) and gear case (44).
45. Remove pinion shaft (42) assembly with ball bearing (41) and retaining ring (40).
46. Remove six hex head cap screws (W), twelve flat washers (X), and six lockwashers (Y).
47. Remove gear case (44). Remove gear case gasket (48).
48. Remove needle bearing (43). This bearing is installed with a press fit.
49. Remove retaining ring (45).
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