Hale Fyr Port - Manual (Page 19)

a) 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 thread.
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
Pump Head
Impeller Disc
Impeller Cavity
Wedge
Impeller
Vane
Bent or Cracked
Impeller Disc
Wedge
(Incorrect)
CORRECT INCORRECT
Figure 4