valutazioni - 5, GPA: 4
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Facilità d'uso
D. Mechanical Seal Removed. CAUTION C. Impeller and Key Removed. B. Casing, Gasket, and Wearing Ring Removed. MODELS 341A-342A-344A 4 13. The seal flexible cup and stationary seat should be pressed out of the bracket (35) and the cavity cleaned of all residue. Make sure that the 1/32 inch radius in the seal seat cavity is not damaged during disassembly since a sharp edge can easily cut the flexible cup during reassembly. 14. On Model 344A pumps, remove key (42) from the shaft and remove slingers (47 and 47A). 15. Unscrew capscrews (48) and remove bearing cap (49). Remove “O” ring (oil lubed only) (50) and retainer ring (52). 16. Slide out shaft (55) and bearings (53 and 54). Since bearings (53 and 54) are press fitted on the shaft, they will have to be pulled or pressed off the shaft. Remove grease seals (51) from frame (57), and bearing cap (49). 17. Remove nameplate (34) and screws (33) only if replacement is needed. REASSEMBLY Reassembly will generally be in reverse order of disassembly. If disassembly was not complete, use only those steps related to your particular repair program. 1. Press grease seals (51) into frame (57). (344A) 2. Press bearings (53 and 54) onto shaft (55). Snap retainer ring (52) into place. (344A) 3. Slide shaft (55) and bearings (53 and 54) into frame (57) until retainer ring on bearing (54) comes in contact with frame (57). Place “O” ring (oil lubed only) (50) in place. (344A) 4. Fasten bearing cap (49) in position with capscrews (48). Insert grease seals (51A) and position slingers (47 and 47A) on the shaft. (344A) 5. The mechanical seal (27) (see Figure 1) cannot be installed as an assembly. It is necessary to have the seal seat properly in place in bracket (35) before the balance of parts can be added. Thoroughly inspect the seal cavity in seal bracket, checking for burrs or nicks which could damage flexible cup of mechanical seal. Apply a film of liquid dishwashing detergent (do not use oil or grease) to the flexible cup and seal seat. Insert seat in cup and install in seal bracket, taking care to seat it evenly and squarely. NOTE If it is not possible to insert seat with fingers, place the cardboard protecting ring furnished with seal over lapped face of seat and press into place with a piece of tubing having end cut square. Tubing should be slightly larger than the diameter of the shaft. Remove cardboard after seat is firmly seated. 6. On Model 344A pumps, mount bracket (35) by screwing capscrews (32) evenly into frame (57) to assure proper alignment. Turn all capscrews in an even amount. Fasten the bracket and frame to supports (41 and 64) by placing washers (40 and 63) over capscrews (39 and 62) and screwing them into position. On Model 341A and 342A pumps position bracket (35) on the motor and secure with capscrews (32). Tighten screws evenly to assure proper alignment. H. Shaft Assembly Removed. G. Bearing Cap and Slinger Removed. F. Bracket and Slinger Seal Flexible Cup and Stationary Seat Removed. E. Support Feet Removed. MODELS 341A-342A-344A Secure support (41) to bracket (35) with capscrews (39) and washers (40). Frame sizes 143 thru 184-JM Model 341A only. 7. If nameplate (34) was removed, install and attach with screws (33). 8. Wipe the sealing faces of the seat and seal washer clean. Replace pin (61) in sleeve if it was removed during disassembly. Apply a film of liquid dishwashing detergent to the washer and bellows of the seal and slide the remaining seal parts onto the sleeve making sure the washer is seated against the seal seat. Check the proper sequence of assembly as indicated in Figure 1. The shaft sleeve with the seal rotating assembly on it may now be replaced onto the motor shaft. Spring tension will probably prevent the sleeve from remaining in position axially until the impeller is locked against it. 9. Press wearing ring(s) (7 and 16) in casing (6) and bracket (35). Rings should not be hammered into place. Use a press, or clamp the parts in a bench vise, using wooden blocks to protect the rings. It may be necessary to pin or dowel the rings after assembly if the insert or casing has had rings replaced before, since each reassembly can stretch or tear metal and thereby loosen the fits. If the facilities are available, it is good practice to take a very light finish cut or to ream the inside diameter of the casing rings after pressing to restore roundness. When rings are pressed, they may get squeezed out of shape. 10. Coat the mating surfaces of impeller wear ring(s) (optional 14 and 15) and impeller (11) with Locktite sealant grade 271. Replace wear rings, using the same care as for the case wear ring(s). If the rings are to be trued on a lathe, do not clamp the impeller so tightly that it is permanently distorted. 11. Carefully replace gasket (10) on motor end of impeller. Assembly key (12) and impeller (11) to motor shaft. Secure impeller with gasket (9B), washer (9A), capscrew seal (9C) and impeller screw (9). 12. Install the two pipe plugs (4)...
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