HALE AP, Technical Manual

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C. Wherever procedures call for removal of gaskets, gasket should be replaced.
Clean all gasket mating surfaces before installing new gaskets.
D. Bearings and other components should be cleaned using only recommended
solvents.
E. Bearings and seals should be inspected whenever parts are disassembled.
Look for signs of excessive and irregular wear. Replace seals with tears, that
are out-of-round, hardened, cracked, rusted, impact damaged (dents), etc.
F. Replace any hardware (including pump and input shaft keys) that shows
signs of excessive wear.
G. When inspecting impellers and clearance rings for wear, measure impeller
hub diameter and inner diameter of clearance ring. Compare these meas-
urements to data in Table 23. If measurements indicate, obtain replacement
clearance rings and impeller.
NOTE
If either the impeller hub or clearance rings are out-of-tolerance, both rings and the
impeller must be replaced as well as the mechanical seal.
5.7.7.1 Recommended Cleaners
Hale recommends the following:
•
Safety Kleen
•
Stoddard Solvent
• Loctite Clean-Up Solvent (thread locker removal for hardware and clearance rings)
5.7.8 Repair Kits
Reference the applicable pump drawing REPAIR PART KITS IDENTIFICATION sheet (typically
sheet 3 of 6) for the available level 1, 2, or 3 repair kit part numbers.
5.7.9
Impeller Renew Kits
Reference the applicable pump drawing REPAIR PART KITS IDENTIFICATION sheet (typically
sheet 3 of 6) for the available impeller renew kit part number (or numbers). Refer to the following
paragraph for additional information about the need for installing an impeller renew kit.
5.7.9.1
Worn Clearance Rings And Impeller Hubs
Because clearance ring replacement requires pump disassembly, it is advisable to thoroughly
check other possible causes of low performance before assuming that clearance ring wear is at
fault.
Clearance rings limit the internal bypass of water from the discharge side of the pump back to
the suction side. The radial clearance between the impeller hub and the clearance rings is only a
few thousandths of an inch when new. In clear water, the clearance rings continue to effectively
seal for hundreds of hours of pumping. In dirty or sandy water, the impeller hub and clearance
rings will wear faster. The more wear, the greater the bypass and the lower the pump perfor-
mance. Refer to Table 23.