Hale MG - Manual (Page 81)

Muscle Pumps
5-17
IF THE IMPELLER OR CLEARANCE RINGS
ARE DROPPED, DAMAGED OR DEFORMED,
THEY WILL NEED TO BE REPLACED.
f. Install the inner clearance ring over
the impeller shaft with proper
orientation.
WEAR PROTECTIVE, HEAT-RESISTANT
GLOVES WHILE HEATING THE IMPELLER TO
INSTALL IT INTO THE IMPELLER SHAFT.
HEATED METAL CAN CAUSE INJURY TO
YOUR HANDS.
g. Using the torch, heat the “eye” and
hub of the new impeller in an even
fashion for approximately two
minutes. Then, slide the impeller onto
the shaft with vanes in proper
orientation. (Note: vanes will turn in
clockwise direction when viewed
from the front of the impeller
assembly). If the impeller does not
fully slide onto the shaft allow the
assembly to cool to room temperature
before re-heating.
h. Install the outer retaining ring.
i. Install the outer clearance ring in the
proper orientation.
j. Carefully slide the AutoLube®
assembly over pump shaft.
k. Install the impeller shaft assembly on
the pump.
4. Disassembly (Two-Stage Pump)
a. Remove AutoLube® assembly from
front of impe ller shaft.
IMPORTANT: Mark the impellers as to whether
they are the primary or secondary impeller in
relation to the AutoLube®. Improper or backward
installation of the impellers affects pump
performance.
b. Place the impeller shaft assembly on a
workbench. Note position of impellers
and mark for reassembly.
c. Remove impeller retaining rings.
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. With an acetylene torch, carefully
heat the “eye” and hub of the first
impeller in an even fashion for
approximately two minutes.
e. When heated properly, remove
impeller from shaft using a gear
puller. If the impeller moves but fails
to slide free, do not immediately
reheat. Allow the complete assembly
to cool to room temperature, then
reheat and continue removing the
impeller.
f. Remove the center support bearing.
Then rotate the impeller shaft
assembly end for end and heat and
remove the second impeller.
g. Remove the impeller key.