Craftsman HYDROGLASS 390.251183 Owner's Manual

Also see for 390.251183: Parts list

SERVICEREMOVING MOTOR FOR SERVICEAND REPLACING SHAFT SEALShould repair or replacement of motor or seal be necessary,the pump need not be disconnected from the piping.(If it is necessary to repair or replace the motor, ALWAYS re-place the shaft seal, Key No. 7, Page 16. Therefore, we sug-gest that you order this item and have on hand for futureuse).Remove motor as follows:1. Disassemble pump per disassembly instruction on Page10.2. Remove diffuser and impeller, Key Nos. 8 and 9, Page 16,from pump back half.Remove Impeller as follows:1. Loosen two-machine screws and remove the motorcanopy, Key No. 1A, Page 16.2. Partially unscrew capacitor clamp and move capacitor toone side.3. Place a 7/16” open end wrench on the motor shaft flat.4. To remove, turn the impeller counterclockwise (whenfacing impeller).The seal consists of two parts, a rotating member and a float-ing seat.NOTICE: The highly polished and lapped faces of the seal areeasily damaged. Read instructions carefully.5. Remove pump back half from motor by unscrewing four(4) nuts, Key No. 20, Page 16, and pry back half off ofmotor by inserting two (2) screwdrivers between theback pump half and the motor flange. Rotating portion ofseal will now come off of shaft. Motor is now separatedfrom pump (see Figure 9).6. Lay back half of pump (large surface down) on a flat cleansurface and tap out ceramic seat. Clean seal cavity fromwhich seal was removed and clean motor shaft.Install New Seal As Follows:1. Clean polished surface of floating seat with clean cloth.2. Wet the outer edge of the O-Ring on the stationary seatwith soap solution.3. Press seat into cavity firmly and squarely with finger pres-sure. (Make sure polished face of seal is facing towards in-side of pump). If seat will not locate properly, place acardboard washer over polished face of seat and use pieceof 3/4” standard pipe for pressing purposes (see Figure11).4. Dispose of cardboard washer and make sure that polishedsurface of seat is free of dirt or foreign particles and hasnot been scratched or damaged during installation.5. Inspect shaft to make sure that it is clean.6. Reassemble back half of pump to motor.7. Apply soap solution to inside diameter and outer face ofrubber drive ring.8. Slide seal assembly on shaft (sealing face first) until rub-ber drive ring hits shaft shoulder. BE SURE you don’t chipor scratch sealing face on shaft shoulder.9. Screw impeller on shaft until impeller hub hits shaftshoulder. This will automatically locate seal in place andmove the sealing washer face up against floating seat face(see Figure 11).11475 0194479 0194477 0194Figure 11Figure 10Figure 9