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Malfunctions: Causes and elimination
Fault
Cause
Troubleshooting
Important
The vacuum pump
produces a abnormal
noise
(The blades making
a hammering noise
when starting from
cold is normal if it
disappears within
two minutes as the
operating tempera-
ture increases)
The pump housing is worn
(chatter marks)
Repair by manufacturer or
authorised workshop
Elmo Rietschle
Service
The vacuum adjustment valve
(if available) is vibrating
Replace the valve
Section 7.4
Blades are damaged
Repair by manufacturer or
authorised workshop
Elmo Rietschle
Service
Vacuum pump or its oil is too
cold
Note the ambient temperature
and the intake temperature
Section 2.3
The lubricating oil is too vis-
cous
The oil viscosity must comply
with ISO VG 100 as per DIN
ISO 3448
Section 7.2.3
Water in lubricating
oil
Pump sucks in water
Install water interceptor up-
stream of the pump
—
The pump sucks in more wa-
ter vapour than is suitable for
its water vapour compatibility
Contact the manufacturer for
increased gas ballast
—
Pump only works for a short
time and therefore does not
reach its normal operating
temperature
Let the pump continue to run
with a closed suction side
after extracting the water
vapour until the water has
evaporated from the oil
—
Please contact Elmo Rietschle Service for other malfunctions or those that cannot be eliminated.
Summary of Contents for Elmo Rietschle V-VC 40
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