Operat ion and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
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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 stays inside the holder. Check this subassembly by 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
determined by the O-ring and the springs with no contact between metal and the rotating face.
This step is crucial for the proper 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 gently until reaching
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.
Insert 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.
5
5
4
4
23. At this point you have completed assembly of the double mechanical seals, now continue with
the assembly of the rotors.
Ampco Pumps Company QTS Manual M-030 Rev A 1.16
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