Operat ion and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
M
A
IN
T
E
N
A
N
C
E
Using thickness gages check the clearances between the rotors turning them slowly and
introducing one gage at every point where the rotors are meshed. A practical way is to put
the
gage between the rotors in the front side and slowly rotate them so the gage moves along the
rotors by its rotation. If the clearances do not comply (according to the pump model) it is possible
that the synchronization is incorrect.
9. Once you have tightened and checked the rotor
clearances continue closing the pump. Place the dowel
pins (
25
) inside the holes on the back cover.
WARNING: Operating the pump without all four
dowel pins in place will cause severe damage to the
pump.
11. Insert the casing (
4
) carefully, it should be mounted
and centered on the back cover (
5
) with the dowel pins.
Push back to slide through the studs (
14
). The plug (
53
)
on the casing was used during machining and has no specific use.
12. Insert gasket (
27
) into the groove on the front cover (
1
) and close the pump; use the pocket in
the front cover as a guide for assembling it with the casing.
13. Secure the front cover with the washers (
22
) and nuts (
21
); tighten using a wrench or a six points
female socket. Remember to use the corresponding torque values according to the pump model. This
concludes the rotor assembly.
53
14
27
4
22
5
1
25
21
Ampco Pumps Company QTS Manual M-030 Rev A 1.16
29
