28
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
20. Take the rotating face (
12F
) and insert it into the O-ring; the holder pins must fit the notches
on the rotating face. Push with your hand against the holder until the springs are compressed and
the rotating component stay inside the holder. Check this subassembly pressing the rotating face
against the coil springs.
21. It is important that the notches on the rotating face fit the holder pins; the physical contact is
determinate by the O-ring and the springs with no contact between metal and the rotating face.
This step is crucial for the right assembly of the mechanical seal; failure to do so properly can
cause damage to the mechanical seals, the rotors and can even alter the integrity of the pump.
Place the O-ring (
12A
) into the holder front groove. This completes the subassembly of the rotating
part of the seal.
22. With the subassembly ready, insert the rotary holder on the shaft and push smoothly until
reach the static face placed previously on the back cover. Repeat this procedure to install the other
single mechanical seal on the next shaft.
ATTENTION:
Remember that every double mechanical seal requires lubrication without exception.
Place the flush nipples (
54
), one on each side of the back cover, one works as the inlet and the
other as the outlet of the fluid lubricant.
54
54
23. At this point you have already assembled the double mechanical seals, now continue with the
assembly of the rotors.
M
A
INTE
N
A
N
C
E