339-0047-000 8/00 mRoy A and B - Milton Roy Company - #29

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4.9.3 Diaphragm Replacement (Figures 20-27) The different mRoy models (A, B, H, L, M, P, S & dou-ble diaphragm) all have slightly varying diaphragm con-figurations. Be sure to refer to the appropriate Figure(20-27) when replacing the diaphragm(s). Disassembly 1.Remove the six (6) or eight (8) bolts (350 or 355)from the diaphragm head (330), depending onthe model.2.Remove diaphragm (290) using knife blade.3.Remove contour plate(s) (282).4.If servicing a pump with a square ring (260),remove and discard the square ring.5.If servicing a double diaphragm style pump,remove the intermediate chamber and squarehead plated pipe.6.Carefully clean any parts to be reused. If anychemicals are used in the cleaning process,ensure that they are compatible with the process liquid and hydraulic oil. 4.9.4Motor and Worm Replacement (Figures 18 & 19) The motor will need to be removed in order to replaceor inspect the motor or the gears. Disassembly 1.Remove oil drain plug and drain oil.2.Remove the screws that attach the motor to thepump.3.On plate mounted units, remove motor; the gearshaft may come out as well. If the motor separates from the worm shaft (640), use carenot to lose the shaft key and coil spring. Reassembly 1.Place pump on its side with diaphragm cavityfacing up.2.Install contour plate(s) (282) into position in thehousing and/or diaphragm head (330), as appropriate.3.If servicing a pump with a square ring, fit a newsquare ring (260) into position in the recessedsquare ring groove in the housing.4.Carefully center diaphragm (290) in the shallowrecess in the housing.5.If servicing a double diaphragm style pump,position the intermediate chamber and squarehead plated pipe over the diaphragm. Fit a second new square ring (260) (if required) intoposition in the recessed square ring groove.Carefully center the second diaphragm (290) inthe shallow recess in the intermediate ring.6.Retain diaphragm with thin, flat blade 1/2” to l”wide. 7.Carefully position the diaphragm head andcontour plate (this diaphragm head side contourplate is not used on some models) in place, aligning bolts holes. Remove blade and torquebolts as follows (See Figure 17):a.mRoy Model A, H, & P Metal Heads:265–275 in. lbs. (30-31 N-m) bolting torque(grade 5 or stronger bolts)b.mRoy Model A & L Plastic Heads: 60–70 in. lbs. (7-8 N-m) bolting torquec.mRoy Model B, M, & S Metal Heads: 340–360 in lbs. (38-41 N-m) bolting torqued.mRoy Model B Plastic Heads:75–85 in. lbs. (8.5-9.6 N-m) bolting torquetie down nuts— 25 in. lbs. (3 N-m).Procedures for complete disassembly of the mRoypump are listed below. Some steps can be omitteddepending on which part is replaced. 4.Remove worm assembly (120).5.On units with API motor mount adapters;removal of the motor and adapter together will also lift the worm gear shaft from the pump. Reassembly 1.Reinstall by reversing steps 1 through 5 or followthe “motor conversion” directions. 23