Operat ion and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
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7. Repeat this procedure with the next housing.
NOTCH
DRAG PIN
12L
8. Take the back cover (with the seal housing
inside) and carefully slide along the studs and
shafts pushing it to the back until making
contact with the gear case; use the dowel
pins to center it with the gear case.
WARNING: Operating the pump without all
four dowel pins in place will cause severe
damage to the pump.
12G
28
12H
25
12E
9. Assemble the back cover and the gear case
using the hexagonal socket head cap screws
(
28
) and tighten them firmly.
10. Place the O-ring (
12D
) within the inside
groove of the rotating seal driver (
12B
). Next
insert a spring into each of the holes located on
the inside face of the seal driver.
11. Lubricate the inside diameter of the O-ring
(
12E
) and place it on the inside groove of the
holder. Make sure it is secured.
12. Take the rotating face (
12F
) and insert it
into the O-ring; the holder pins must fit the
notches on the rotating face. Use your hand
to push against the holder until the spring
are compressed and the rotating
components stays inside the holder.
12F
12A
12D
12C
13. It is important that the notches of the rotating face fit the holder pins; the physical contact
is led by the O-ring and the springs with no contact between metal and the rotating face. This step
is critical to the correct assembly of the mechanical seal; failing 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 front groove. This completes the subassembly of the rotating part of the seal.
Ampco Pumps Company QTS Manual M-030 Rev A 1.16
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