20
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
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. This is normal.
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 gear case (
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 gear case 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 necesary if only a seal replacement is
needed
8. Repeat these steps to disassemble the other mechanical seal.
28
12A
6
25
12H
12G
12B-F
28
12A
6
25
12H
12G
12B-F
12J
13
M
A
INTE
N
A
N
C
E
