Operat ion and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
M
A
IN
T
E
N
A
N
C
E
Installing the Double Mechanical Seals
1. Special tools are not required to install the mechanical seals, components can be hand
assembled.
2. Place the dowel pins (
25
) on the gear case, slide them smoothly, if you feel resistance stop and
check the surface finish of the pins and the holes in the gear case; replace the pins if necessary
and clean the holes using a soft towel.
3. Place the set screws (
12T
) in the drive ring (
12S
) using a hexagonal key. The screws must not
pass through the inner diameter of the drive ring. Slide the ring on the shafts until the end and
tighten the set screws.
4. Insert the O-ring (
12R
) into the groove on the rotating face of the secondary mechanical seal
(
12Q
) and slide them together on the shafts until reaching the drive ring. Make sure the set screws
fit the notches on the rotating face.
5. Repeat these last two steps with the other rotating components of the double mechanical seal.
12T
DRAG PIN
NOTCH
12S
12Q
12R
7. The seal housing (
12L
) has a drag pin in the front for the static face of the primary mechanical
seal (
12G
) and two drag pins on the inside for the static face of the secondary mechanical seal
(
12P
).
8. Place O-ring (
12K
) in the outside groove of the seal housing (
12L
).
9. Continue placing the springs (
12M
) inside the seal housing.
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Ampco Pumps Company QTS Manual M-030 Rev A 1.16
