Hale MG - Manual (Page 80)

Muscle Pumps
5-16
m. Remove the remaining screws from
the rear bearing housing, and the
lower pump body.
n. Lift the impeller assembly from the
lower pump housing. Set the
assembly aside.
o. Clean the gasket surfaces of the upper
and lower pump bodies, as well as
those on the AutoLube® and the rear
bearing housing face.
p. Clean the clearance ring and clearance
ring seats in both the upper and lower
pump body halves to remove all the
“build up” material so that the new
clearance ring will seat properly.
NOTE: Pitting of the clearance rings may occur
from the “build up” of material and the effects of
corrosion. Once the seats are cleaned, any pitting
on the clearance rings is considered normal.
2. Disassembly (Single -Stage Pump)
a. Place the impeller shaft assembly on a
workbench. Note the orientation of
impeller vanes and clearance rings.
b. Carefully remove the AutoLube®
assembly from pump shaft end.
c. Remove the outer retaining ring and
outer clearance ring.
NOTE: Before removing impeller, note the
orientation of vanes for proper reassembly. The
vanes will turn in a clockwise manner when
viewed from the front.
WEAR PROTECTIVE, HEAT-RESISTANT
GLOVES WHILE HEATING THE IMPELLER
TO REMOVE OR INSTALL IT INTO THE
IMPELLER SHAFT. HEATED METAL CAN
CAUSE INJURY TO YOUR HANDS.
DO NOT OVER HEAT THE IMPELLER. THE
IMPELLER IS CONSTRUCTED OF BRONZE.
IF THE IMPELLER IS OVERHEATED (AND
TURNS RED OR BLUE DURING REMOVAL
FROM THE SHAFT), IT HAS BEEN
WEAKENED AND MUST BE REPLACED.
d. Using an acetylene torch, carefully
heat the “eye” and hub of the impeller
in an even fashion for approximately
two minutes.
e. When heated properly, the impeller
should be removed from the shaft
using a gear puller. If the impeller
moves but does not slide free, do not
immediately reheat. Allow the
complete assembly to cool to room
temperature, then reheat and continue
removing the impeller.
f. Allow the components to cool to room
temperature.
g. Remove the inner clearance ring.
h. Remove the impeller key.
3. Assembly (Single -Stage Pump)
a. Clean the impeller shaft and the
keyway.
b. Check the water way in the seal
housing for restrictions.
c. Install the inner retaining ring.
d. Install the new gasket on the seal
housing face.
e. Verify the key is free to slide in the
impeller keyway, then install the key
into the keyway.