Sherwood Pump Catalog

46 3 2 1 12 15 11 13 22 19 16 17 21 18 10 9 7 4 8 6 5 14 25 23 20 18000 Series Technical Guide Assembly/Disassembly Instructions The following assembly/disassembly procedures apply to all 18000 Series pumps. Deviations from pump to pump are primarily a result of different methods of drive and mounting. Pump numbers can be found stamped into the cover plate of the pump. Disassembly: A. Remove the bolts (1) and lockwashers (2) from the cover (3). B. Remove the cover, quad rings (4), impeller (5), cam liner halves (6), and wearplate (7). Note the direction of the impeller blades to ensure proper replacement of the impeller during the assembly procedure. Caution: the pin (8) might fall out from its place between the cam liner halves. The impeller can be removed using impeller puller 23631, 25105, or a 3/4” x 16 UNF bolt. C. Using external snap ring pliers, remove the retaining ring (9) from the shaft. D. Slide the washer (10) and mechanical seal (11) off of the shaft. E. Remove the bolts (12) holding the body (13) to the housing (14). F. Slide the housing off of the shaft and body assembly. G. Press the seal seat (15) out of the housing. H. When applicable remove the drive gear assembly: while supporting the drive gear (16), remove the nut (17), nut washer (18), and key (19) from the shaft. Slide the gear off of the shaft and remove the thrust washer (20) behind the gear. I. Using internal snap ring pliers, remove the retaining ring (21) from the body. Remove the bearing shield (24) from the body. J. Press the bearing and shaft assembly (22) out of the body. K. Remove the lip seal (23) and washer (25) from the body. L. Inspect the shaft for grooving of the lip seal area and heavy fretting of the spline portion that drives the impeller. Inspect the bearings for loss of grease, corrosion, and rough rotation. If the shaft or bearings exhibit such a wear, replace the entire shaft and bearing assembly (22). Warning: Do not try to build the shaft and bearing assembly from the individual parts, but instead purchase the entire shaft and bearing assembly. Due to extremely tight tolerances, special assembly procedures for this assembly must be followed to prevent galling of the shaft in the lip seal area. Assembly: A. Replace the washer (25) then press the lip seal (23) into the pump body (13) with the metal backing ring of the lip seal toward the housing (14) and away from the engine. Care should be taken to ensure proper alignment of the lip seal to the pump body and that the lip seal is uniformly pressed to prevent distortion. B. Press the shaft and bearing assembly (22) into the pump body. C. Slide the bearing shield (24) into the pump body and against the inner bearing. D. Using internal snap ring pliers, install the retaining ring (21) into the body.