Hale Rear Mount - Manual (Page 6)

5. To remove impeller, put a flat pry bar on each side of impeller between it and pump head. The
pry bars should bear against impeller disc opposite the impeller vanes. Tap end of shaft with a
soft hammer, while maintaining pressure on pry bars, until impeller comes off. Do not put too
much pressure on the pry bars. Application of heat may be necessary. Use a torch to slowly
heat the impeller hub area until the impeller comes loose. Remove the impeller lock nut (or
capscrew and washer) and impeller.
CAUTION: Impeller, nut and shaft may be hot and cause burns. Use proper protective gloves
while handling the parts.
6. After the impeller and impeller key have been removed, the seal parts can then be removed for
inspection. The seal should be replaced.
7. In replacing the seal, insert the stationary seal seat and the rubber seal with the seal surface
toward you into the pump head using pac seal lubricant.
8. Wipe a little pac seal lubricant on the inside of the steel and rubber encased carbon sealing
washer. Then, slide this assembly on the shaft with the carbon wearing lip toward the seal
seat.
CAUTION: Se sure to keep the seat and sealing washer wearing surfaces clean, and be
careful not to damage the lip on the sealing washer.
9. Spray loctite primer N on the mating surfaces of the shaft and impeller. Allow to dry.
10. Place the seal spring, smaller diameter end, on pilot of sealing washer.
11. Apply loctite #640 to entire mating surface of shaft (where contacts the impeller) and to the
threads on the shaft.
12. Insert impeller key into shaft and apply loctite #640.
13. Push impeller onto shaft, making certain the seal spring seats in the spring bore of the impeller.
14. Replace the impeller, lock nut and the 5/32" x 2" cotter pin or the capscrew and washer (where
applicable). Follow torquing instructions on appropriate cross-section plate.
15. Using a greased gasket and new sealing capscrews, bolt the Volute body to the pump head.
CLEARANCE RINGS
There are two replaceable clearance rings or wear rings in these pumps. One is pressed into the
pump head, and the other is pressed into the pump body.
CHECKING PUMPER PERFORMANCE
Periodic checks should be made to determine if the pumper performance has dropped from its
original efficiency. Every fire pump has an underwriters rating as shown:
RATING EXAMPLE
Rated capacity at 150 PSI 750 GPM at 150 PSI
Rated capacity at 165 PSI 750 GPM at 165 PSI
70% Capacity at 200 PSI 525 GPM at 200 PSI
50% capacity at 250 PSI 375 GPM at 250 PSI
The current underwriters rated capacities covering all pumps are 500, 750, 1000, 1250, 1500,
1750, 2000, 2500 and 3000 GPM.
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