31
OPERATION AND MAINTENANCE MANUAL
QTS SERIES
Twin Screw Positive Displacement Pump
QTS-M
08
seal.
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 bearing housing, slide them smoothly, if you find difficulties
stop and check the surface finish of the pins and the bores on the bearing housing; replace the
pins if necessary and clean the inside bores (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
shoulder 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 drag
pins fit the notches on the rotating face.
NOTE: For ease of assembly, you can lubricate the O-rings with an FDA approved silicone grease
5.
Repeat these two last steps with the other rotating components of the double mechanical
seal.
6.
The seal housing
(12L)
has a drag pin in the front for the static face of the primary mechanical
seal
(12G)
and drag pins on the inside for the static face of the secondary mechanical seal
(12P).
7.
Place O-ring
(12K)
in the outside groove of the seal housing
(12L).
8.
Continue placing the springs
(12M)
inside the seal housing.
12T
DRAG PIN
NOTCH
12S
12R
12Q
12T
DRAG PIN
NOTCH
12S
12R
12Q
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