Operat ion and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
M
A
IN
T
E
N
A
N
C
E
5. To loosen the tapered driven ring (
20
) it is necessary to use three of the socket head cap
screws (
46
) to pull it out as illustrated. The first tapered driven ring has three threads for this
purpose.
6. Remove the first half of the keyless shaft hub (20). Inside the bore of the gear will be the second
half of the keyless shaft hub (18). By completely removing the hub, the driven gear (42) will rotate
freely over the synchronization ring (19).
20
20
46
18
19
7. On the pump side place both rotary holder subassemblies (
12A-F
) on the shafts. In this step it is
not necessary to assemble the complete seals; it is just a preliminary assembly to keep position.
It is recommended to remove the O-rings (
12A
and
12D
) in the subassembly.
8. Take the new rotors with each hand respectively [left hand-left rotor (
2
) / right hand-right rotor
(
3
)] and mesh them together. The faces of both rotors must be at the same level.
12A-F
3
2
9. With the rotors meshed, place them on the shafts. Turn the shafts until the splines coincide.
10. Push the rotors on the shaft until they reach each rotary holder subassembly. Install the rotor nuts
(
11
) and tighten them simultaneously. Avoid contact between rotors. Consult torque specifications
for proper settings.
Ampco Pumps Company QTS Manual M-030 Rev A 1.16
31
