Hale MG - Manual (Page 75)

Muscle Pumps
5-11
h. Install 7/16-14UNC screws into
threaded holes on bearing housing to
use as jacking screws.
i. Turn the jacking screws clockwise
evenly to back the bearing housing
out of the pump body. Make sure the
gearbox and bearing housing stay
straight as the assembly is backed out.
j. Remove the gearbox and impeller
assembly to a suitable work area.
k. Remove cotter pin and nut from
impeller shaft.
l. Using a suitable puller remove the
impeller and impeller key from the
shaft.
m. Use hooks that fit around the shaft
and seal then remove the spring and
spring retainer then the remainder of
the mechanical seal assembly.
n. Remove the cup and seat from the
bearing housing.
o. Clean impeller shaft and all com-
ponents.
p. Measure the impeller wear surfaces
and the wear rings. The wear rings
should be replaced if the radial
clearance is 0.015 to 0.020 inch per
side or overall.
q. If necessary, remove and replace the
wear rings in the pump body and rear
bearing housing.
r. Inspect the oil seal in the rear bearing
housing and replace if necessary.