Hale Rear Mount - Manual (Page 10)

the greater the pressure at which the pump is operating, the larger will be the bypass and the
more the performance will be reduced.
When new, the clearance between the impeller hubs and the ring is approximately five to nine
thousandths of an inch per side (.005-.009). Any increase will allow more bypass and lower
performance, but when the pump is adequately powered, it should not be necessary to replace
clearance rings and impellers until the average radial clearance reaches 15 to 20 thousandths
or more.
If the clearance rings wear faster than the impeller hubs, it is necessary to replace only the
clearance rings. This will largely reduce the bypass and restore the pump to near original
performance. A complete restoration requires that the impellers also be replaced. Undersize
clearance rings and replacement impellers are available through Hale Service Department.
SERVICE – PARTS – INFORMATION
If you have any questions concerning the pump or require service or replacement parts, contact the
apparatus manufacturer or Hale Products, Conshohocken, Pennsylvania, 19428, telephone
610-825-6300, web address: www.haleproducts.com. Be sure to include the pump serial number
which is recorded on the face of this manual. It is also stamped on the name plate attached to the
drive unit.
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