30
OPERATION AND MAINTENANCE MANUAL
QTS SERIES
Twin Screw Positive Displacement Pump
QTS-M
08
QTS-M
08
MAI
N
T
E
N
AN
C
E
secondary seal
(12P)
it is necessary to remove the back cover of the pump.
6.
Loosen the hexagonal socket head cap screws
(28)
that fix the back cover to the bearing
housing
(6)
and extract it through the studs. The back cover is centered by dowel pins
(25),
this
pins can come out with the back cover or stay in the bearing housing.
7.
When extracting the back cover it is possible that the rotating face
(12Q)
comes attached
to the secondary static face
(12P);
handle it with care to prevent any harsh contact to the seal
faces with the shafts.
8.
Loosen the hexagonal socket head cap screws
(13)
on the back of the cover to eject the seal
housing. Push with your thumbs from the front of the back cover. Be careful when removing the
housing to avoid any harsh contact.
9.
Take away the O-ring
(12K)
on the housing using the O-ring hook.
10.
To remove the static face of the secondary mechanical seal
(12P)
hold the housing with
the static face looking up and pull with your thumbs.
12M
12L
12M
12N
12L
12P
NOTE: Always place the seal face looking up to prevent the springs from falling out.
11.
Using the O-ring hook, remove the O-ring
(12N).
Remove the springs
(12M)
if necessary.
12.
To extract the rotating components of the secondary mechanical seal pull out of the shaft
the seal face
(12Q)
and remove the O-ring
(12R)
located inside this rotating seal face.
13.
With a hexagonal key, loosen the set screws
(12T)
from the drive ring
(12S)
and pull it out if
needed.
14.
Repeat these steps to uninstall the rest of the components of the other double mechanical
12K-O
13