Product Manual

V. PUMP DISASSEMBLY AND REPAIR
Use a thread locking compound such as Loctite #242 on the bracket screws (Item #9 in fig. 7), and on the impeller screw (Item #16 in fig. 7)
A. DISASSEMBLY
Remove the ten 1/4”-20 body screws. Remove the pump body. Remove the rubber check valve from the volute and the large 0-ring from around the perimeter of the bracket. Remove the volute. 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 impeller, gently force two screw-drivers 180° apart, under the back of the impeller and gently pry the impeller off the shaft.) One half of the shaft seal is in the impeller hub, 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 flat polished faces. Remove the four bracket screws* and the small 0-rings on each screw and remove the 9” 0-ring segment which forms an arc over the shaft seal. Pull the bracket off of the engine. The stationary portion of the shaft seal can now be pressed out from the back side of 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 0-ring from around the seal. *NOTE: ASSEMBLY Put all parts back together in the reverse of the order used in disassembly. When installing a new seal, always replace both elements of the seal and put the 0-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 into place, use a piece of pipe that will bear only on the flange of the metal seal case. Be sure both seal halves are fully seated and square with respect to the pump shaft. During final assembly, it is recommended that all of the screwhead 0-ring seals (item #8, fig. 7) be replaced. Lubricate these with vegetable oil (
Do
Not
use Petroleum base oil) before
assembly.
1.
2. 3. 4. 5. 6.
B.
1.
2. 3.
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.
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 away from the bracket face by: a. Adding one or more washer type
shims (Item #30, fig. 7) under the
impeller hub.
The impeller can be shimmed closer to the bracket by: a. Removing one of more washer type
shims (Item #30, fig. 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. 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: Check volute face for excessive wear. Slight scoring is acceptable. 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. NOTE: Carefully assemble the pump. The bracket and the pump body when assembled will hold the volute in place. Lubricate the body o-ring with a vegetable based lubricant before replacing it in the pump. When assembling nipples, fittings, and elbows into the pump body, wrap the
male threads with teflon sealing tape. Proper tightness is hand tight plus one full turn with a pipewrench.
4. 5. 6.
7.
8. 9.
10.
11.
If the vane thicknesses are less than noted above, shimming up to .090 (Item #30, fig.7) is acceptable. If more shimming than .090 is required, the impeller should be replaced.
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With pump running and with pump body full of water, put vacuum gauge over suction opening and check suction ability according to section IV.
VI. SPECIAL INFORMATION
After pump is assembled and before starting, rotate the shaft by hand and listen for possible scraping
CAUTION:
noises. A scraping noise indicates improper clearances, requiring disassembly and reshimming.
12.
A.
8.
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 flexible couplings chart number VI-A). Proper shaft and coupling alignment reduces vibration and prevents premature coupling failure. The following 8 steps help in obtaining proper shaft alignment:
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 basePlate kits listed after couplings chart VI-A)** Place the pump and drive-unit on the base plate. Measure the distance between the center- line of the pump shaft and the base plate surface. Measure the distance between the centerline of the drive-unit shaft and base plate. Compare measurements obtained from steps 3 and 4 and use spacer blocks for height adjustment to insure alignment of both shafts. Place the coupling halves over each shaft. Put the “spider” between the two halves and couple the two halves together. To assure parallel alignment (Figure 5) place a straight edge along the side of
both coupling halves in two different locations, 90° apart. The coupling is aligned when the straight edge rests squarely on the sides of both coupling halves. To avoid angular misalignment, insert a measuring device (taper gauge or feeler gauge) between the coupling faces at four locations 90° 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.
FIGURE 5
FIGURE 6
CORRECT
INCORRECT
COUPLING
PART
NUMBER
POWER
UNIT
SHAFT*
DIAMETER
ELECTRIC
MOTOR
FRAME
SIZES
58-0786 .625” 58-0786 .875” 58-0787 1.125” 58-0788 1.375” 58-0875 1” 58-0876 75”
FLEXIBLE-COUPLINGS CHART VI-A
*One-half of each coupling has a .750” diameter bore to fit the pedestal pump shaft.
56
143T-145T
182-184
182T-184T
213T,215T
213-215
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1.
2. 3. 4. 5. 6.
7.
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