How to Connect 2 Stages of Multiple Pumps: “Z-Drive” Technique

Multiple pump stages were created to always have in stock the parts needed to assemble multiple pumps quickly and easily. This is precisely why, at Vivoil, we have designed a wide and versatile range. In fact, our stages are available in different finishes, including Primary, Intermediate and Final pumps of all size groups (zero, one, two and three) and are designed to allow you to connect them easily.

For example, in the case of the stages in which there is no primary shaft – that is, the shaft equipped with a splined rear tang, which is necessary to assemble the multiple pump -, it is still possible to make the connection and transfer the motion from the front pump to the rear pump via the secondary shaft or driven shaft.

To do this you need to modify the final pump and reverse its direction of rotation, allowing you to have the connection Z-Drive.  In this article you will find all the steps to perform this operation.

Steps to follow: the example of the final pump 

In the video below, we show you how to modify a standard Vivoil final pump of group two so that it can be coupled with a primary pump of the same group, in case the transfer of motion is via the driven shaft.

The video clearly shows that the two stages cannot be coupled, because the connection of the primary pump is on the driven shaft at the bottom, while that of the final pump is on the top.

In order to connect them, it is necessary to change the latter and reverse its direction of rotation, following these steps:

1 – Disassemble the final pump 

Remove the nuts and unscrew the four retaining screws, then slip off the flange and gears, being careful not to rotate the bushing in any way. 

2 – Reposition the gears

Move the gears like this:

  • the shaft that takes motion from the primary pump should be positioned at the bottom;
  • the bushing should be placed back inside the pump, in exactly the same direction as it was before disassembling the gears.

It is very important to make sure that the bushing is in the correct position, because only then will suction occur correctly.

3 – Reassemble the flange 

Reassemble the flange, insert the four retaining screws, and replace the nuts. Tightening torques vary by size group, and values are given in the catalogs.  You can now proceed with the connection of the two stages.

4 – Connect the two pumps using the sleeve and splice that make up the coupling kit.

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