22
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
12L
DRAG PIN
12H
NOTCH
12G
7. Repeat this procedure with the next housing.
8. Take the back cover (with the seal housing
inside) and carefully slide along the studs and
shafts pushing it to the back until making
contact with the gear case; use the dowel
pins to center it with the gear case.
WARNING!
All four dowel pins must always be
placed before running the pump. Not doing so
will cause severe damage to the pump.
9. Fix the back cover to the gear case with the
hexagonal socket head cap screws (
28
) and
tighten them firmly.
25
25
28
10. Place the O-ring (
12D
) on the inside groove
of the stainless steel collar (
12B
). Insert the
springs (
12C
) on the inside drills on the collar.
11. Lubricate the inside diameter of the O-ring
(
12E
) and place it on the inside groove of the
holder and make sure it is fixed.
12. Take the rotating face (
12F
) and insert it
into the O-ring; the holder pins must fit the
notches on the rotating face. Push with your
hand against the holder until the springs are
compressed and the rotating component stays inside the holder.
13. It is important that the notches of the rotating face fit the holder pins; the physical contact
is lead by the O-ring and the springs with no contact between metal and the rotating face. This
step is crucial for the right assembly of the mechanical seal; failing to do so properly can cause
damage to the mechanical seals, the rotors and can even alter the integrity of the pump. Place
the O-ring (
12A
) into the holder front groove. This completes the subassembly of the rotating
part of the seal.
M
A
INTE
N
A
N
C
E
12E
12F
12D
12B
12A
12C