Operat ion and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
M
A
IN
T
E
N
A
N
C
E
2. To inspect the O-rings inside, remove the rotating face pulling the rotary holder out gently; inside
are the springs (
12C
) and the O-ring (
12D
), CAUTION, 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 come 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 seal 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 hold the back cover to the gear case
(
6
) and extract it through the studs (
14
). The back cover is centered with dowel pins (
25
); these
pins can come 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 necessary if only a seal replacement is
required.
8. Repeat these steps to disassemble the other mechanical seal.
28
12B-F
6
25
12J
13
12H
12G
12A
Ampco Pumps Company QTS Manual M-030 Rev A 1.16
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