
FL2 S
erieS
P
umP
13
p
ump
e
nD
D
iSaSSembLy
Drain all product from the pump head prior to disassembly. The pump
head may be isolated with inlet and outlet valves. Disconnect the suction
and discharge piping from the pump. Disconnect the seal flush supply
and return lines to your pump if the pump is
equipped with a double mechanical seal.
a) Loosen and remove the four cover dome nuts
from the cover.
b) Next remove the cover. If it is stuck, tap on
the cover with a soft-faced hammer (
Figure 5
).
c) Remove the cover o-ring.
d) To remove the rotors, first loosen the first
rotor, place the dowel between the rotors to
prevent rotation as shown in
Figure 6
.
FL3 Only: Secure the drive shaft with a chain wrench to prevent rotation.
e) Turn the first rotor nut counter-clockwise
(models 15-75 require a Flat Cover Rotor
Bolt Tool).
f) Remove the rotor nut and o-ring.
g) To loosen the other rotor, place the dowel
between the rotors on the opposite side of
the pump (FL2 only). Again turn the rotor
nut counter-clockwise.
h) Remove the rotor nut and o-ring.
i) The rotors and rotor o-rings can now be
removed from the pump housing by pulling
straight. Handle the rotors with care to avoid
damage. While removing the rotors watch for the stamped markings. There should be one
dot on the rotor for the drive shaft and two dots on the rotor for the idle shaft.
FL3 Only: Both rotors must be removed at the same time.
r
emove
the
mechanicaL
SeaL
a) Remove the two housing nuts securing the
pump housing to the gearbox.
b) Slide the pump housing away from the
gearbox. If the housing is stuck, alternately
tap on the inlet and outlet ports with a soft-
faced hammer (
Figure 7
).
Note:
the gapping
spacers and the rotating seals will come off
with the pump housing (except for the FL2
15).
c) Clean and examine all of the pump compo-
nents for damage. Replace damaged com-
! Warning
Figure 5
Figure 6
Figure 7