Product Manual

A scraping noise indicates improper clear ances, requiring disassembly and reshim- mimg. 12. With pump running and with pump body full of water, put a vacuum gauge over the suction opening and check suction ability according to section IV.
4
A. DISASSEMBLY 1. Remove the ten 1/4”-20 body screws. Re- move the pump body. 2. Remove the rubber check valve from the volute and the large O-ring from around the perimeter of the bracket. 3. Remove the volute. 4. Unscrew the impeller screw and remove it along with the small O-ring. Slide the impeller and the key off the shaft. (to facilitate removal of the impeller, gently force two screw drivers 180 degrees apart, under the back of the impeller and gently pry the impeller off the shaft.) 5. One half of the shaft seal is in the impel- ler hub, and the other half is around the shaft, inside the bracket. The impeller portion of the seal can be carefully pried out with a screwdriver. If you plan to reuse the seal, be careful not to nick or scratch either of it’s at polished surfaces. 6. Remove the four bracket screws* and the small O-rings on each screw and remove the 9” O-ring segment which forms an arc over the shaft seal. Pull the bracket off the engine. The stationary half of the shaft seal can now be pressed out from the back side the bracket. Use a round wooden plug 1-3/16 in diameter and carefully press the seal out straight if it might be reused. (Be careful not to damage the seal face). Remove the O-ring from around the seal. *NOTE: If plugs are installed over the bracket screws on your pump remove the plugs by screwing a body screw into the hole and carefully pulling them out. B. ASSEMBLY 1. Put all parts back together in the reverse of the order used in disassembly. 2. When installing a new seal, always replace both elements of the seal and put the O-ring in place around the bracket half of the seal. Protect the smooth lapped sealing surfaces from damage when pressing in the new parts. To press the bracket portion of the seal in place, use a piece of pipe that will bear only on the ange of the metal seal case. Be sure both seal halves are fully seated and square with respect to the pump shaft. 3. During the nal assembly, it is recommend- ed that all of the screw head O-ring seals (item #8, g. 7) be replaced. Lubricate these with vegetable oil (DO NOT use petroleum base oil) before assembly.
4. Use a thread locking compound such as Loctite #242 on the bracket screws (Item #9 in g. 7), and on the impeller screw (Item #16 in g. 7). 5. The clearance between the impeller vanes and the volute face should be about .015” to .025” for good performance. This front clearance can be attained by shimming. The impeller can be shimmed from the bracket face by: a. Adding one or more washer type shims (Item #30 g. 7) under the impeller hub. The impeller can be shimmed closer to the bracket by: a. Removing one or more washer type shims (Item #30 g. 7) from under the impeller hub (if any were used on your pump). After shimming turn the impeller to ensure that the impeller is not touching the bracket. If necessary, add or remove more shims. Be sure that the impeller is completely on the shaft when checking shimming. Put pressure only on the hub when pressing impeller on the shaft. 6. Check the impeller vanes for proper height. The following measurements should be found when measuring the vane height on the outside perimeter of the impeller: *Impeller Number Vane height at tip of vane 58-0667 .535” 58-0704 .535” 58-0706 .535” 58-0974 .600” 58-0975 .975” *See parts list for further description NOTE: If the vane thicknesses are less than noted above, shimming up to .090” (Item #30 g. 7) is acceptable. If more shimming than .090” is required, the impeller should be replaced. 7. Check volute face for excessive wear. Slight scoring is acceptable. 8. The four bracket screws (with O-ring on each) holding pump bracket to engine should be tightened securely with a large screwdriver or socket wrench. 9. NOTE: Carefully assemble the pump. The bracket and the pump body when assembled will hold the volute in place. 10. Lubricate the body O-ring with a vegetable based lubricant before replacing it in the pump. 11. When assembling nipples, ttings and elbows into the pump body, wrap the male
threads with teon sealing tape. Proper tightness is hand tight plus one full turn with a pipe wrench. CAUTION: After pump is assembled and before starting, rotate the shaft by hand and listen for possible scraping noises.
V. PUMP DISASSEMBLY AND REPAIR
VI. SPECIAL INFORMATION
A. FLEXIBLE COUPLED PUMPS: COUPLING ALIGNMENT Measure the diameter of the pump shaft and power unit shaft. Choose the appropriate coupling for your pump and power unit. (See exible couplings chart VI-A). Proper shaft and coupling alignment reduces vibration and prevents premature coupling failure. The following 8 steps help in obtaining proper shaft alignment: 1. Make sure you use a rigid base plate large enough for the assembly of the pump and the drive unit. We offer kits, 58-0028 and 58-0016, for this purpose. (See base plate kits listed after couplings chart VI-A)** 2. Place the pump and drive unit on the baseplate. 3. Measure the distance between the
centerline of the of the pump shaft and the baseplate surface. 4. Measure the distance between the cen- terline of the drive unit shaft and the baseplate. 5. Compare measurements obtained from steps 3 and 4 and use spacer blocks for height adjustment to ensure alignment of both shafts. 6. Place the coupling halves over each shaft. Put the “spider” between the two halves and couple the two halves together. 7. To assure parallel alignment (Figure 5) place a straight edge along the side of
INCORRECT
CORRECT
PUMP SHAFT
PUMP SHAFT DRIVE SHAFT
DRIVE SHAFT
COUPLING
COUPLING
FIGURE 5
both coupling halves in two different locations, 90 degrees apart. The coupling is aligned when the straight edge rests squarely in the sides of both coupling halves. 8. To avoid angular misalignment, insert a measuring device (taper gauge or feeler gauge) between the coupling faces at four locations 90 degrees apart. (See arrows in Figure 6) and measure the gap at each of the four locations. For proper alignment all four measurements should be equal. Reshimming may be required to achieve this alignment.
90
O
ANGLE
DRIVE SHAFT
FEELER GAUGE
FIGURE 6
COUPLING
PART
NUMBER
POWER
UNIT SHAFT*
DIAMETER
ELECTRIC
MOTOR
FRAME SIZES
58-0786 .652” 56
58-0786 .875” 143T-145T 182-184 58-0787 1.125” 183T-184T 213T-215T 58-0788 1.375” 213-215 58-0875 1” ------- 58-0876 .75” -------
FLEXIBLE COUPLING CHART VI-A * One half of each coupling has a .750” diameter bore to t the pedestal pump shaft.