26
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
12M
12L
12N
12P
M
A
INTE
N
A
N
C
E
12L
12H
NOTCH
DRAG PIN
12G
13
12L
12H
NOTCH
DRAG PIN
12G
12K-O
13
12K-O
13
10. Place the O-ring (
12N
) on the static face of
the secondary seal (
12P
) and insert it on the seal
housing (
12L
); match the notches with the pins on
it. Press evenly with both hands until the element
gets completely inside the housing. If the pins
are not aligned with the notches the element can
be damaged; the final position is determinate by
the spring and the O-ring so there should be no
contact between metal and the static face of the
secondary mechanical seal.
14. The static face of the primary mechanical
seal (
12G
) has a notch to prevent rotation. Place
O-ring (
12H
) on this element and insert both on
the pump housing. Be sure the notch matches
the drag pin on the seal housing (
12L
) and push
gently until the element gets completely inside;
the final position is determined by the O-ring so
there should be no contact between metal and
the static face of the primary mechanical seal.
11. Continue placing the seal housings (with seal
faces and O-rings) inside the back cover (
5
).
12. Tighten the hexagonal socket head cap screws
(
13
) to secure the seal housing in the back cover.
13. Repeat this procedure with the next seal
housing.
12H
12G
12L
DRAG PIN
NOTCH
