Technical Description
Troubleshooting and Corrective Action
5
Dual Stage Rotary Vane Pumps User Manual/ 87-900-937-01(L) 131/140
SYMPTOM PROBABLE CAUSE SUGGESTED REMEDY CARD REF.
6 The pump is very
noisy even at steady
operating conditions.
A) Exhaust valves
damaged.
Inspect the valves. 106
B) High suction pressure,
or gas ballast device is
open.
Check the system and the
gas ballast valve (see items
4-A and 4-B).
C) Elastic star of joint is
damaged.
Check and replace if
necessary.
D) A screw of the joint
has become loose.
Lock the screw after
application of Loctite 222 (for
slack threads).
7 When the pump is
stopped, the inlet
pressure rises rapidly.
A) The anti-suckback
device is defective.
Disassemble and check the
anti-suckback device.
108
B) The cause of the
problem is not with the
pump.
See “Note”.
8 The pump does not
produce a sufficient
vacuum.
A) Not enough oil, or oil
contaminated.
Check level and appearance
of the oil. Open the Gas
Ballast for half an hour at
least; change the oil
whenever necessary.
01
102
B) Oil ducts clogged
inside.
Proceed as at 3-B.
C) Direction of rotation
inverted.
Proceed as at 3-C.
D) OR gaskets
communicating with the
inlet line defective.
Replace the gaskets. 109
E) Exhaust valves
damaged or out of place.
Proceed as at 6-A.
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