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Product Service: Domestic 1-800-522-7658, International 816-333-8811
Chapter 7: Troubleshooting
Drain the oil and refill with clean oil. Repeat as
necessary.
2. Check the oil level in the pump. Ensure it is filled
to the correct level.
3. Check vacuum hose connections from the pump to
the Freeze Dryer and try running the unit.
If vacuum problems continue, consider obtaining a
second vacuum gauge capable of reading a vacuum of
10 x 10
-3
mBar. It is often useful in determining if the
vacuum pump is good and the vacuum sensor reading is
accurate.
4. Isolate the pump by disconnecting the vacuum hose
from the Freeze Dryer. Deadhead the pump by
inserting the vacuum sensor from a secondary
vacuum gauge into the end of the vacuum hose and
observe the vacuum reading obtained. Confirm that
the pump is capable of achieving an ultimate
vacuum less than 10 x 10
-3
mBar or approximately
10 microns. If an inadequate vacuum reading is
obtained, the pump has most likely failed and may
need to be replaced or rebuilt.
II. Gaskets, Tubing, Connections,
Sample Valves
1. Inspect gasket(s) for cracks or defects. Ensure the
gasket is clean. Apply a thin coat of vacuum grease
to the gasket. Keep in mind, too much vacuum
grease can actually cause leaks.
2. Check the drain line and ensure the drain plug is
installed and the tube appears to be in good
condition.
3. Check all rubber vacuum tubing for signs of
deterioration or cracking.
4. Check all connections and make sure they are
secure and leak tight.
5. Check all sample valves on the collection chamber
and ensure all valves are closed or in the vent
position. Check to ensure all fittings are tight and
sealed properly against the chamber. Inspect valves
for cracks or cuts.
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