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halves of the pump body. Then remove the roller assembly, noting the slot in one end of the center shaft of the assembly.
This slot must engage with the pump motor shaft on the 2960. Be certain to orient the "slot end" correctly on reassembly.
Remove the old tubing, removing tubing retainers as required. The 2990 Preventive Maintenance Kit contains new
retainers and fittings. Clean the inside of the pump housings as needed. A small amount of lubricant helps to control noise
("squeaks") when the pump rollers are turning. Appropriate lubricant is provided in the maintenance kit. Using a tissue or
swab, lightly coat the inside of the pump body chambers and rollers with lubricant before installing tubing.
Install the new pump tubing as shown in the figure below.
When installing new pump tubing, first thread the waste line tubing through one chamber of the pump body. Install the
roller assembly (slot in center shaft oriented up) into the pump body chamber. It will help to twist the roller assembly as
you install it to more easily capture the tubing in between the rollers and chamber wall. Once in place, install the retainer
and adjust the lengths of tubing on each side, locating the retainer on the inlet side of the pump chamber. You should
have about 3 inches on the inlet (right) side.
Next install a retainer washer on the sample line and insert the tubing through the outer pump chamber such that the
plastic retainer tab and washer will be located on the right when mounted.
Reassemble the 2 pump housings insuring they mate flush. Rotate the halves so that the mounting holes are aligned.
Secure the two pump housings together with the O-rings.
Finally, resecure the pump body assembly to the 2960 using the two thumb screws.
Reconnect the tubing as shown in the figure below.
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