Hale MG - Manual (Page 71)

Muscle Pumps
5-7
C. Packing Replacement
When the packing adjustment has been taken up, a
single ring of packing can be added. However, it is
usually more satisfactory to repack the pump.
Refer to figures 1-9 and 5-3 for a cross-section
showing the packing arrangement and number of
packing rings. The three rings adjacent to the
packing gland can be replaced without
disassembling the pump. The ring in front of the
lantern does not need to be replaced. Repack the
pump as follows.
DO NOT RUN ENGINE WHILE MAKING
PACKING ADJUSTMENT
1. Loosen the packing nut lock.
2. Loosen the packing nut. If necessary, soak
the threads with penetrating oil and work
the nut back and fourth to loosen it.
Loosen the adjusting nut just enough to
remove the split glands. If the front part of
the gland is of the split type, remove the
two halves.
3. Remove the old packing rings with a
packing hook or blow the packing out. The
hook can be made from a bent piece of stiff
wire or small pointed rod. Another type of
packing hook consists of a corkscrew on the
end of a flexible shaft. Be sure to remove all
shreds of old packing, and clean out the
packing housing as much as possible.
4. Remove all old packing, dirt, and foreign
matter from the bearing housing under the
packing gland.
5. Repack using the Hale packing kit
recommended for your particular pump.
For most pumps, the packing is 7/16-inch
square cut to the proper length. Wrap one
length of packing around the shaft to form
a ring, and push the ring into the packing
housing. Install the second ring the same
way, but stagger the joint one-third of the
way around from the first joint. Put foil
separators between each packing ring. The
foil separators must be cut to fit the shaft.
Install the other rings, again stagge ring the
joints.
6. Replace the gland and adjust it according
to the Packing Gland Adjustment
procedure in this section.
7. Operate the pump normally for about 15
minutes, and check the packing gland. If
necessary, adjust the packing nut
according to the Packing Gland
Adjustment procedure in Section 3.
D. Mechanical Seal Replacement
NOTE: Before starting disassembly matchmark
with a center punch the rear bearing housing,
mechanical seal housing, and pump body for
proper alignment during reassembly.
Qmax and Qtwo Pump Mechanical Seal
1. Removal (Refer to figure 5-4)
a. Remove gearbox in accordance with
paragraph B.1, this section.
b. Remove the 5/8-11 x 1-1/4 inch long
cap screw and bearing retainer washer
from the end of the impeller shaft.
c. Remove twelve 1/2-13 x 1-3/4 inch
long cap screws that hold the rear
bearing housing to the pump body.
d. Install two 1/2-13 x 2-1/2 inch long
cap screws into the 1/2-13UNC
threaded holes on the rear bearing
housing to use as jacking screws.
Install a 1/2-13 x 2-1/2 inch long cap
screw into one of the holes on the rear
bearing housing into the pump body
to keep the mechanical seal housing
from rotating while removing rear
bearing housing.
NOTE:
It may be necessary to use prybars to
loosen the back bearing and gear before attempting
to remove the rear bearing housing.