Fristam Pumps FP Series, Instruction And Maintenance Manual, Page: 9 / 32

Fristam FP/FPX Series Pump
9
Figure 14
m) Rotate the pump shaft so the keyway is on top.
Now slide the rotating seal assembly which in-
cludes: the rotating seal, the seal o-ring, the seal
washer, the seal spring and the seal driver onto the
pump shaft.
n) Lubricate the outside o-ring with a food grade
lubricant, if it is not EPDM, and install it in the
groove on the front of the seal spring and driver
assembly.
o) Compress the spring assembly with two fingers
and install the impeller key into the keyway on the
pump shaft (
Figure 15
).
p) Slide the impeller onto the pump shaft. The slot in
the impeller hub will slide over the impeller key.
q) Generously lubricate the new impeller nut gasket
with a food grade lubricant (if it is not EPDM) and place it onto the impeller nut.
r) Thread the impeller nut with the gasket in place onto the pump shaft.
s) Place the 5/16” diameter rod in the pump shaft hole. Allow the
rod to rest against the pump flange support to keep the shaft
from rotating while tightening the impeller nut with the 15/16”
socket wrench (
Figure 16 ). Tighten to the proper torque listed
on page 5.
t) Now install the new cover gasket onto the pump cover. When
placing the cover gasket into the pump cover, gently stretch the
gasket into position. Do not roll the gasket into position. With
the cover gasket in position, place the pump cover onto the
front of the pump. (
Note:
the pump serial number is stampeded
into the ‘top’ of the pump cover.)
u) Thread the cover nuts onto the housing studs. Make sure the
cover o-ring is properly seated in the cover to ensure that it will
not get pinched when tightening the cover nuts. Tighten the
cover nuts by tapping on them with the soft-faced hammer.
v) Now rotate the pump shaft to make sure that the impeller moves freely. If it does not, recheck your
assembly to make sure that gaskets are not pinched and everything is seated properly.
Listen to the pump as you turn the shaft. A small amount of noise from the seals is normal, but if there
is metal-to-metal contact, the sound will be notice-
able. If there is metal-to-metal contact, check the
impeller gap. Regap the impeller if necessary. See
page 16 for directions. Replace the shaft guard and
secure with the guard screws.
Reconnect the suction and discharge piping.
WARNING:
Mechanical seals must never run dry, even
momentarily. Seal damage will result.
Figure 15
1265000087
12/10/02
Figure 16