Operat ion and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
34
Ampco Pumps Company QTS Manual M-030 Rev A 1.16
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Important Notes
1. Use a six point female socket to loosen and tighten the front cover nuts to prevent marking them.
2. The wet parts are comprised of the front cover (
1
), rotor nut (
11
), rotors (
2
,
3
), pump casing (
4
),
mechanical seals (
12
) and the back cover (
5
). Check that these components are free from damage
such as hit marks, abrasion from fluids, or any damage caused by foreign objects. If considerable
damage exists and the pump efficiency is reduced, contact your distributor for spare parts. NOTE:
Any damage to the casing or rotors can cause pump failure due to the tight clearance of the Q T S .
3. If any of the gaskets or O-rings are damaged (marks, wear or deformation) replace them all
together; use a replacement kit for gaskets and O-rings of the same material according to the
pump application (either EPDM or Viton).
4. Use caution near gasket grooves, damage to the groove may cause the gasket to leak.
5. Always use a six point female socket to loosen and tighten the rotor nuts to avoid indentations.
6. The dowel pins surface finish is rectified. If they are damaged, replace them to prevent assembly
problems.
7. If rubbing marks are visible between the rotors synchronization or rotor assembly is not correct. If
rotor replacement is required it is necessary to repeat the gear synchronization procedure. Please
contact Ampco for additional information.
8. Single mechanical seal housing (
12J
) has only one external groove while the double mechanical
seal housing (
12U
) has two external grooves.
9. You may use water or a FDA food grade silicon based lubricant to lubricate O-rings and gaskets.
10. When an O-ring is damaged, it is highly recommended to replace the entire set of O-rings
(including both shafts) at the same time to ensure the service life.
11. The seal faces are very fragile; handle them with care to avoid breaking or loosing.
12. If any seal face is scratched, hit or damaged, it is highly recommended to replace the entire
seal kit to ensure the service life.
13. Ensure that the drag pins match the notches on the seal elements to assure the correct
position and assembly.
14. Every double mechanical seal without exception should be properly lubricated. Even the
shortest time operating without lubrication may damage the mechanical seals. The flush system
must be installed before starting the pum p.
