Hale Fyr Pak(2006 to Present) - Manual (Page 19)

Fyr Pak
Operation and Maintenance Manual
19
c) Disconnect the overspeed switch wire at the connector. Disconnect the short overspeed switch
ground wire by pulling spade connector from the overspeed switch.
d) Remove the overspeed switch tubing from the overspeed switch.
e) Remove the three locknuts from the vibration isolators that fasten them to the pump mounting base.
f) Lift the pump/engine assembly from the mounting base.
4. Assembly of Pump/Engine to Mounting Base
Assembly is the reverse of the removal procedure above.
5. Repair or Replacement of Any Components in Pump (Replacing mechanical Seal):
a) Remove pump/engine assembly from mounting base. Refer to item 3 “Removal of Pump/Engine
assembly.”
b) Remove the four screws that fasten the volute body to the pump head. Remove the volute body
c) Remove the impeller retaining screw and washer.
ATTENTION: The impeller screw is left hand threaded.
NOTE: To prevent the engine from rotating, when removing the impeller screw, place a long 3/8” screw
or 3/8” diameter bar through one of the pump head mounting holes and a flat bar in one of the impeller
cavities.
d. Remove impeller by putting hardwood wedges on each side of impeller, between impeller
and pump head. The wedges should bear against impeller disc directly behind impeller
vanes to prevent damaging the impeller; refer to figure 4. Tap end of engine shaft with
a Soft (rawhide, rubber) headed mallet, while maintaining pressure with wedges until
impeller comes off.
DO NOT PUT TOO MUCH PRESSURE ON WEDGES
e) With impeller removed, remove the impeller key.
f) Remove the spring and carbon section (sealing washer) of mechanical seal from engine crankshaft
sleeve. Observe the ceramic seal seat and carbon sealing washer. If they are scored or lip on the
sealing washer is worn or cracked, replace complete assembly.
g) If further disassembly is required beyond mechanical seal replacement, remove the four 5/16-18 x
2-1/2 Lg. screws and 5/16 flat brass washers that fasten pump head to engine.
h) If mechanical seal ceramic seal was not removed previously, remove from head.
i) Pull engine crankshaft brass sleeve from shaft,
j) There is a replaceable clearance or wear ring used in this pump. Inspect impeller hub and clearance
ring bore, replace if any of these surfaces are scored or worn excessively.