Hale MG - Manual (Page 74)

Muscle Pumps
5-10
g. Insert the mechanical seal cover in
mechanical seal housing making sure
to line up the bolt holes and center
punch marks.
h. Install four 7/16-14 x 1-1/4 inch long
cap screws into the holes. Tighten cap
screws evenly and torque to 40 ft-lb (54
N-m). When installing the cap screws
make sure they are locked in place
using a suitable thread locking
compound such as Loctite #242 or
equal. If cap screws require replacement
they shall be replaced with grade 5, zinc
plated steel, nylon locking type.
i Slide the slinger onto the impeller
shaft.
j. Install new oil seal into the rear
bearing housing.
k. Place a new gasket over the mating
surface of the mechanical seal
housing and rear bearing housing.
Apply a light coating of grease to the
gaskets to hold them in place during
assembly. Use only lithium based
grease with 1 to 3% moly bdenum
disulfide. Some examples of correct
greases are: Mobile Grease Special
and Sun Oil – Sunoco MOLY #2EP.
l. Install two 1/2-13UNC studs into
mechanical seal housing in pump body
to aid in alignment of the rear bearing
housing. Slide the rear bearing housing
over the impeller shaft making sure the
oil seal aligns properly. Do not allow
the weight of the rear bearing housing
to rest on the oil seal. Align the bolt
holes and center punch marks.
m. Insert twelve 1/2-13 x 1-3/4 inch long
cap screws into the holes. Evenly tighten
the cap screws to 65 ft-lb (88 N-m).
n. Install 310 bearing onto the impeller
shaft and properly seat into bearing
housing.
o. Place the gear key into slot on
impeller shaft then install the gear
onto the impeller shaft making sure
the key lines up with the key way in
the gear.
p. Install 409 bearing over the impeller
shaft and properly seat in bearing
housing.
q. Install bearing retainer washer on
impeller shaft end and secure using
5/8-11 x 1-1/4 inch long cap screw.
Tighten cap screw and torque to 135
ft-lb (183 N-m).
r. Install gearbox in accordance with
paragraph B.2, this section.
Qflo and Qpak Pump Mechanical Seal and
Clearance Rings
1. Removal (Refer to figure 5-5)
a. Place apparatus out of service in
accordance with department pro-
cedures.
b. Open drains and drain pump body.
c. Drain gearbox oil.
d. Tag and disconnect air lines and
electrical connections.
e. Disconnect drive shafts.
GEARBOX AND IMPELLER ASSEMBLY
WEIGHS ABOUT 500 LBS (228 KG). MAKE
SURE PROPER LIFTING DEVICES ARE USED
FOR REMOVAL AND INSTALLATION OF
GEARBOX.
f. Attach proper lifting device to
gearbox.
g, Remove the twelve 7/16-14UNC X 1-
1/4 inch long screws from the bearing
housing and pump body.