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4
Problem analysis
Troubleshooting Guide
Fault
Possible cause
Remedy
Reference
section
t
Pump does not
start.
Pump
is
connected
incorrecfly.
Motor protection
switch
incorrectly
set.
Operating voltage does
not
match
motor.
Motor is malfunctioning.
Oil
temperature is
below
12
.C
(S4.Ð.
Oil
is
too
viscous.
Exhaust
filter
/
exhaust
line is
cloqqed.
Connect
the pump
correctly.
2.5
2.5
Set
motor
protection sw¡tch
properly.
Replace
the
motor.
Replace
the
motor.
Heat
the pump
and pump oil
or
use different
oil.
Use appropriate oil
grade.
2.1
3.3
3.4
Replace the filter or
clean
the exhaust
line.
Pump does not
reach
ult¡mate
pressure.
External
leak.
Float valve
does not close.
Anti-suckback valve is malfunctioning.
lnadequate lubrication due to:
-
unsuitable or contaminated
oil,
-
clogged oil
lines.
Vacuum
lines
are
dirty.
Pump
is
too
small.
Repair
the
pump.
Repair
the
valve.
Repair
the
valve.
Change the oil (degas it,
if necessary).
Clean
the
oil
casing.
Clean vacuum
lines.
3.9
aa
Check
the
process date;
replace
the
pump,
if necessary.
Pumping speed
is
too
low.
Dirt
trap
in
the
intake
port
is
clogged.
Clean
the
dirt trap.
Precaution:
install a
dust filter in intake
line.
lnstall new filter
elements.
3.6
Exhaust
filter
is
clogged.
Connecting
lines are
too
narrow or too
long.
Use
adequately wide and short connecting
lines.
3.4
2.2
After switching
ofi
pump
under
vacuum, pressure
in
system
rises
too
fast.
System
has
a
leak.
Anti-suckback is malfunctioning
Check the system.
Repair
the
valve.
Q7
Pump gets
too
hot.
Cooling
air
supply
is
obstructed,
Cooler
is dirty.
Ambient temperature
is
too
high.
Process gas
is
too
hot.
Oil
level is
too
low.
Oil
is
unsuitable.
Oil
cycle
is
obstructed.
Exhaust
filter
/
exhaust
line is
obstructed.
Set
pump
up
correctly.
Clean
the
cooler.
,r
Set
pump
up correctly max
40o C.
Change
the
process.
Add
oil
to
reach the
conect
oil
level.
Change
the
oil.
Clean
or
repair
the oil
lines.
Replace the exhaust
filter,
clean the exhaust
line.
1.4
o,o
ó..J
3.4
Oil in intake
line
or
in
vacuum
vessel.
Oil
comes from the vacuum system.
Check the vacuum system.
Anti-suckback valve
is
obstructed.
Clean
or
repair
the
valve.
Sealing
surlaces of anti-suckback
valve are
damaged
Clean
or
repair
the
intake port and
valve.
or
dirtY
Drain
the
excess
oil.
Oil
level
is
too
high.
ö.
/
3,7
.J.J
Pump's
oil
consumption
too
high, oil mist
at
exhaust.
Exhaust filters are clogged or damaged.
Nozzle of float valve
is
clogged,
Oil
level is
too
high.
Replace the
f¡lters.
Check the
valve,
clean the
nozzle
Drain
the
excess
oil.
3.4
3.9
3.3
Oil
is
turbid.
Condensation
Degas
the
oil or change
the
oil
and clean the pump.
Precaution:
open the gas
ballast valve
or
inseft a
condensate trap.
Clean
the
gas ballast intake
filter.
2.6
QF
Pump
is
excessively Oil
level is
very low
(oil
is no longer
visible)
noisy.
Add
oil
aa
*
Reference section: This column
refers
to
the section
in
the Operating lnstructions
that
contains the applicable repair information.
N.B.: Never
mount
used
seals.
Always mount new
seals,
GA02314_000_03
-
07/2014 19
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