26
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
Uninstalling the Single Mechanical Seals
1.
Remove with your hands the stainless steel rotary holder subassembly
(12B-F)
by grabbing
and pulling out from the rotating face
(12F).
When pulling, the static face (
12G)
might come
along.
2.
To inspect the O-rings inside, remove the rotating face pulling gently out the rotary holder;
inside are the springs
(12C)
and the O-ring
(12D),
be careful because the springs are loose.
Finally remove the O-ring
(12E)
which is on the rotary holder groove.
3.
Remove the O-ring
(12A)
housed in the rotary holder on the front groove. Sometimes O-rings
can be loose out of their grooves and get stuck to other components.
4.
On the back cover
(5)
pull out the static face
(12G)
and the O-ring
(12H).
Avoid any harsh
contact on the sealing faces.
5.
To remove the seal housing
(12J)
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
(14).
The back cover is centered with dowel pins
(25)
, this pins can go out along with the back cover or can stay in the bearing housing as well.
7.
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
seal housing to avoid any harsh contact. This step is not necessary if only a seal replacement is
needed
8.
Repeat these steps to disassemble the other mechanical seal.
28
12B-F
25
12H
12G
12A
6
12J
13
