Elmo Rietschle V-VGC 4/6 - Manual (Page 26)

26 | www.gd-elmorietschle.com © Gardner Denver Schopfheim GmbH, Gardner Denver Deutschland GmbH
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
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 46 as per DIN
51519 Section 7.2.2
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.