25
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
M
A
INTE
N
A
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C
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Installing the Double Mechanical Seals
1. You do not require special tools to install the mechanical seals, use your hands to place the
components into the assembly.
2. Place the dowel pins (
25
) on the gear case, slide them smoothly, if you find difficulties stop and
check the surface finish of the pins and the drills on the gear case; replace the pins if necessary
and clean the inside drills (may use scrub sponge).
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 tight
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 two last steps with the other rotating components of the double mechanical seal.
12T
DRAG PIN
NOTCH
12S
12R
12Q
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.
