Operat ion and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
M
A
IN
T
E
N
A
N
C
E
right side rotor (
3
) and just loosen the torque of the second nut. Slowly loosen simultaneously the
two rotor nuts until both are out.
5. Progressively loosen both nuts by slowly alternating between the two. Fully loosening one side
before the other will cause the seals to push the loose rotor forward creating interference between
the two rotors.
2
9
11
3
6. Remove the O-rings (
26
), spring washers (
23
) and the rotor nut socket set screws (
24
). Sometimes
the socket set screws may remain installed on the shafts, to remove them use a hexagonal key.
7. Take off the gasket (
27
) placed on the back cover. Sometimes this gasket may get stuck to the
casing, pull out carefully to avoid damaging it on the studs or rotors. Pull both rotors straight out.
24
23
26
27
8. You have finished the rotor removal procedure. Every time you replace the rotors be sure to
perform the synchronization procedure to guaranty the right assembly. Now continue with the
replacement of the mechanical seals.
Mechanical Seal Replacement
1. Here is a description of the procedures for inspection and replacement of the mechanical
seals. Every pump has two mechanical seals.
Ampco Pumps Company QTS Manual M-030 Rev A 1.16
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