Sherwood Pump Catalog

37 T ECH GU I DES 4 14 5 3 2 1 18 15 8 7 16 17 9 10 13 12 11 6 P Series Technical Guide – 10615 Impeller Assembly/Disassembly Instructions The following assembly/disassembly procedures apply to many P Series pumps. Deviations from pump to pump are primarily a result of different methods of drive and mounting. Disassembly: A. Remove the screws (1) and lockwashers (2) that hold the cover (3) to the housing (4). B. Remove the o-ring or gasket (5) from the housing. C. Using two pliers or an impeller puller, remove the impeller (6) from the housing. Knock the key (7) out of the shaft (8). D. Remove the cam screw and washer (9) from the cam (10) and pull the cam out of the housing. The wear plate (11) can now be removed from the housing. E. Using an external snap ring pliers, remove the retaining ring (12) that holds the seal seat in place. Slide the seal seat (13) and washer (14) off the shaft. F. From the drive end of the pump (pulley end or hub end) locate a support directly between the pump housing and hub (15) as close to the shaft as possible. Make sure the housing is free and not supported, and then press the shaft out of the hub. G. Remove the large internal retaining ring (16) from the housing at the end of the bearing. H. Support the housing and press the shaft, bearings (17), spacer (18), slinger (19), and retaining ring (12) out through the pulley end or hub end of the housing. I. The seal assembly (13) is pressed into the body. It can be removed by pushing a tool through the bearing end and up against the metal or back side of the seal. J. Remove the retaining ring from the shaft and bearing assembly. Support the bearings on the inner race and push the shaft out of the bearings. Assembly: A. Assemble a retaining ring (12) on the shaft into the second groove from the impeller end. Push the first ball bearing (17) from the pulley or drive end of the pump over the shaft (8) and against the retaining ring by pressing on the inner race of the bearing. Assemble the spacer (18), and then the push the second ball bearing on the shaft and against the spacer in the same manner the first bearing was pressed on the shaft. Slide the slinger (19) against the retaining ring (it should be positioned between the bearings and mechanical seal). B. Press the mechanical seal (13) into the body from the impeller end. Make sure the seal is pressed in square and that the carbon face is not scratched during assembly. A tool should be used to assure proper assembly. The carbon face is positioned toward the impeller. C. Push the bearing and shaft assembly into the housing (4) using care not to cock the bearing. A tool is recommended that will give you uniform pressure on the bearing outer race. Lock the bearing in place with the large internal retaining ring (16). D. Assemble the ceramic seat assembly (13), washer (14) and retaining ring (12) over the shaft from the impeller end. Locate the white ceramic surface against the carbon face of the seal. Warning: Do not damage (scratch) the white ceramic surface of the seat or the carbon face of the seal – minor scratches can cause the seat assembly to leak. Lubricate the rubber part of the seat with a non-petroleum fluid for ease of assembly. E. Support the shaft at the impeller end without contacting the mechanical seal. Press the hub (15) onto the shaft flush to the