Technical Description
Troubleshooting and Corrective Action
5
Dual Stage Rotary Vane Pumps User Manual/ 87-900-937-01(L) 129/140
Troubleshooting and Corrective Action
NOTE
If the pump breaks down or does not work well, first check thoroughly that all
the standards rules listed in the sections relevant installation and operation are
currently observed.
If you cannot get sufficiently low pressure, the problem may lie with the system
connected to the pump, i.e. the vacuum chamber and inlet line.
Even when the design sizes are correct, the problems listed below are still fairly
frequent:
a) faulty seals: check that the seals are fitted, are in good working orderand are
clean; check all joints, taps, sight glasses, weld joints, etc.
b) unsuitable materials: avoid the use of rubber, plastic or even metal parts that
are porous or permeable.
c) volatile substances: as far as possible, eliminate humidity, grease, dirt, rust,
solvents (even small traces).
Tab. 12
SYMPTOM PROBABLE CAUSE SUGGESTED REMEDY CARD REF.
1 The pump does not
start (or stops
immediately).
A) The motor-pump
coupling is defective.
Check state of the elastic
joint and replace the parts as
needed.
105
B) Viscosity of the oil has
increased.
Examine the oil and change if
necessary (find out why it
has deteriorated).
102
C) Excessive friction
inside pump.
Test the resistance to
rotation, by turning the joint
by hand. If the rotors are
blocked, disassemble the
pump body and check state
of the parts inside.
111
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