When the pump has problems starting in the morning after sitting overnight
it is due to one of these issues.
1. Amperage supplied to pump is short of the motors requirement.
Check that the amperage is sufficient at the circuit box. Motor
damage will eventually happen if there is insufficient current to the
motor over extended periods of time.
2. Pump is cold. The pour point of the oil is roughly 10-15
If you are near this temperature
Make sure the pump oil sump is heated. Move the pump to
a "warm room." If your ambient temperature
where the pump is, is around this number in the winter the pump will have
trouble starting because the oil is "froze". Because this
condition creates a situation where the pump is inadequately lubricated
(until the oil is fluid in the pump) then it is possible to accelerate
wear of the pump if this situation persists.
3. The pump is getting contamination from water or acidic components which
is causing rust or scale formation overnight that then has to be cleared
for the pump to operate. This issue should be dealt with if it is
the case, because eventually the pump will stop working at all.
4. When pump is shut down the inlet of the pump is not vented to atmospheric pressure and oil
has backed up into pump inlet causing the pump to temporarily lock. A
review of pump shut down procedure posted on this web site should help rectify
this problem once it is understood. The vacuum pump is not a
positive displacement pump ie... it is not designed to pump oil or
liquids. The inlet needs to be relived as part of the shutdown