26
11. Install drive key (A).
12. For 3500/4500 “BH” hydraulic drive assembly, go to Section 13, INSTRUCTIONS FOR ASSEMBLY OF A
TYPE “MBH” HYDRAULIC DRIVE.
13. Read and understand all safety instructions and warnings before installing and operating pump.
3500/4500 “HB” and 3622 “SBFO” Pumps (See Figure 14.2)
14. Place drive gear (34) into case bore.
15. Install two hollow dowel pins (J) in backplate end of case. Place appropriate number of case gaskets (20)
on backplate side of case (19A, B, C, D, E).
16. Set case assembly aside and build backplate assembly as described in following steps.
17. Place triple lip seal (10) with two lips facing toward seal chamber onto opening of seal chamber in
backplate (6A, B). Press triple lip seal into seal chamber until back side of seal is flush with face of seal
chamber. Take care to use a tool that will not damage or distort seal casing. Install one packing washer
(18).
18. Place one square head bolt (G) through each slot in backplate (6A, B) and through each hole in seal
retainer (9). Using two locknuts (F), secure seal retainer in place.
19. Use a small file or stone to break sharp edges of drive shaft (32) keyway that will be under pump drive
gear (34).
20. Install outboard ball bearing (2) on drive shaft (32) as shown in Figure 14.2. Bearings are pre-lubricated
and do not require lubrication at time of initial installation. A small amount of grease will be required
during regular maintenance. Align setscrews in inner race of ball bearing with wide groove in shaft.
Tighten setscrews in ball bearing (2) to secure bearing to drive shaft (32).
21. Lubricate triple lip seal (10) in backplate and shaft on end that will slide through triple lip seal with a light
oil. Carefully slide shaft through backplate and triple lip seal from outboard bearing end until ball bearing
(2) seats in bearing bore.
22. Install retaining ring (3) to secure ball bearing (2) to backplate.
23. Install key (B) in keyway of drive shaft that will be under gear.
24. Align key in shaft of backplate assembly with keyway in drive gear of case assembly and slide backplate
assembly together with case assembly.
25. Secure backplate to case using two washer head cap screws (K) and eight hex head cap screws (L).
26. Read and understand all safety instructions and warnings before installing and operating pump.
3600/4600 “BH” Pumps (See Figure 14.1)
27. Install backplate end retaining ring (36A) on drive shaft (32). Install key (B) on drive shaft. Slide drive
gear (34) onto drive shaft. Install faceplate end retaining ring (36B) on drive shaft to secure drive gear.
28. Place appropriate number of case gaskets (20) on backplate side of case (19A, B, C, D, E). Slide drive
gear (34) assembled with drive shaft (32), and backplate (6a, B) into case bore. Align backplate (6A, B)
on hollow dowel pins (J). Secure backplate (6A, B) to case (19A, B, C, D, E) using two washer head cap
screws (K) and eight hex head cap screws (L).
29. Install packing washer (18) over drive shaft (32) and into packing bore of backplate (6A, B).
30. Install packing rings (16) and lantern ring (17), if used, in backplate bore. Stagger joints on each packing
ring 180 apart. Seat each ring before adding next ring. Rings must not be tamped or seated too tightly.
31. Check drive shaft (32) for free movement after each ring is installed.
32. When packing box is sufficiently full to allow entry of packing gland (14) about ¼ of an inch [6 mm],
reassemble packing gland.
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