GEV GPM 308 Service manual

EDIZIONE 01/12
OPERATING MANUAL
AND
SPARE PART LIST
GP + GP
VACUUM GROUPS
GENERAL EUROPE VACUUM Srl
VIA DEL COMMERCIO 9
20090 BUCCINASCO (MI) ITALY
TEL. ++39 02 48841120
FAX ++39 02 4453957
e-mail: [email protected]
http://www.gevac.com

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GP+GP – Maintenance book Pag.2 of 43

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GP+GP – Maintenance book Pag.3 of 43
The instructions shown in the present manual are related to :
Vacuum groups assembled with Oil lubricated rotary vanes vacuum pumps model “GP” and
vacuum tank
Drawings and data stated in this manual are not binding. G.E.V. reserves the right, firmly keeping
the performances and the operation of the described pumps, to alter the design and any data
herewith given , any time that it deems appropriate, either for improving the pumps same or for any
other reasons, without being forced to immediately bring to up to date this manual.
It is absolutely mandatory that these operating instructions be read and understood
prior to the vacuum group installation and start up.
The GEV vacuum groups have been manufactured according to the newest technical standards and
safety regulations as per “Machines directives 2006/42/ CE” and additions.
If not properly installed or used without following the stated instructions, dangerous situations or
damage might occur.
Warning
This signal indicates the operating procedures that must be strictly observed to prevent
hazard to persons.
.
Beware
This signal indicates the procedures that must be strictly followed to prevent damage or destruction
of the pump or its components.
Warning
When working on pumps on the pumping system, it is important to strictly observe and follow the
“Operating instructions “.
Before starting any work disconnect the unit from power supply.
Take all the precautions for ensuring that the pumps cannot suddently start
If the pumps have pumped hazardous gases, it will be absolutely necessary to determine the nature
of the hazard and take the appropriate safety precautions.
Take the appropriate precautions prior to check the intake or exhaust port, the vacuum tank & the
oil exausth piping.

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GP+GP – Maintenance book Pag.4 of 43
GEV ASSISTANCE
If you send a pump to General Europe Vacuum indicates whether the pump is free of substances
damaging the health or whether it is contaminated. If contaminated, indicate the nature of hazard.
Warning
The pump must be packed in a way that will not be damaged during shipping and that no harmful
substances can escape from the package.
Warning
This manual is valid for standard products. If the vacuum group is a special execution. The group
will be supplied with an additional manual which shall have to be considered as an integrative part
of the manual itself.

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GP+GP – Maintenance book Pag.5 of 43
GENERAL INDEX
DESCRIPTION PARAGRAPH
GENERAL INSTRUCTIONS: RISKS LIST O
-Mechanicalrisks O.1
-Electricalrisks O.2
-Temperaturerisks O.3
-Acousticrisks O.4
OPERATING INSTRUCTIONS
DESCRIPTION A
- Operating principle A.1
- Main parts into the vacuum system A.2
-Lubricants A.3
- Transport, lifting, manipulation and stock A.4
INSTALLATION OF THE VACUUM GROUPS GP+GP
-Installation B.1
- Connection to system B.2
- suction side B.2.1
- exhaust side B.2.2
- Electric connection and electric panel board B.3
- Vacuum group start-up B.4
- Vacuum group running B.5
- condensable gas and steam pumping B.5.2
- operating in cycles in / out B.5.3
- Vacuum switch regulation B.6
- Vacuum group stop B.7
- Ultimate pressure of the pump B.8
- Assembling of gas ballast valve – Option - B.9
MAINTENANCE C
- Maintenance schedule C.1
-Oilcheck C.2
- Oil level C.2.1
- Oil condition C.2.2
-Oilchange C.3
- Replacement of oil remover cartridges at discharge C.4
-Electric motor disassembling C. 5
Vacuumswitch D
Regulation D.1
Troubleshooting guide E
Overall dimensions, technical datas of GP/GPM pumps
Safety instructions for installation in hazardous areas

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GP+GP – Maintenance book Pag.6 of 43
O RISKS LIST
O.1 Mechanical risks.
The presence inside the vacuum group of moving parts leades to the evaluation of the possible
mechanical risks due to the same parts. For this reason, GEV has equipped all their machine with
protective casing firmily screwed on pumps and fit for protecting dealing with the pumps. It is
recomended to provide for skilled personnel. GEV production complies the machine directives no.
89/392.
O.2 Electrical risks.
GEV vacuum groups are built in compliance with CEI 17-13/1; CEI 64-8; CEI 20-22; CEI EN
60204. Check that electric panel board is connected to earth and the vacuum group is protected by
means of magnetothermical device.
O.3 Temperature risks.
GP vacuum pumps work with oil as lubricant. This, during the running increase the temperature of
the pump, covers, piping. Each part, where the temperature can increase, and protective cover is
missing, a lable is stickered on, to prevent high temperature risks.
O.4 Acoustic risks
GEV vacuum group have been designed and manufactured taking into consideration the acoustic
risks standards for medical & industrial applications.

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GP+GP – Maintenance book Pag.7 of 43
OPERATING INSTRUCTIONS
A. Description
A.1 Operating principle :
GEV vacuum groups GP+GP or GPx2 are assembled with two or more oil-sealed rotary vanes
vacuum pumps, single stage, type GP. Each vacuum group is calculated and manufactured in order
to work with one vacuum pump with technical datas enough for the vacuum application. A second
pump, installed in stand by, will start-up whenever the vacuum level won’t be keep with just one
pump in working. Two vacuum switches will give the start and the stop to each pump in relation to
the vacuum level adjusted on the instruments. However, a standard vacuum group is verify to work
between –550 and –700 mmHg vacuum. An electric selector is assembled to the electric panel
board to select which pump use as working and stand by. A suggest is to select the pump priority
checking the hourconters on the panel board, in order to allow the same number of working hours
for each pump. If asked, the electric panel board can be supplied with time-automatically pumps
inversion.
Warning
The GP vacuum pump are not engineered for pumping aggressive, corrosive,poisoned,
inflammable or explosive gases. These vacuum pumps cannot operate in explosive, inflammable or
classified under this standard environments.
In case of any doubt, contact GEV.
Beware
GP cannot suct gases containing liquid or solid substances. All precations shall have to be taken in
case of this situation.
In case vacuum pump should run in dusty environment it is recommended to fix it with an
additional filter, properly sized. In some applications, It is worthwhile to mount an oil-sump filter
(GFOP) together with a cartridge filter in the following manner : vacuum pump, oil-sump filter,
cartridge filter – intake. In case of any doubt, contact GEV
A.2 Main parts into the vacuum system
No.2 Oil lubricated vane vacuum pumps GP with internal no-return valve
No.2 vacuum switch to start/stop the pumps automatically
No.2 inlet filter to protect the pumps against dust
No.2 manual exclusion valve to allow standard maintenance operation
No.1 electric panel board
No.1 vacuum tank (horizontal or if asked vertical)
No.1 outlet common piping complete of outlet liquid trap.

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GP+GP – Maintenance book Pag.8 of 43
A.3 Lubricants
General Europe Vacuum recommends its special oil “TYPE G 880” to allow vacuum pump works
properly
If you use a non-approved oil, GEV cannot guarantee that the pumps will meet their operating
specifications ( ultimate pressure, pumping speed, operating temperature etc. ) However the
warranty is voided only if a non-approved oil adversely affects the operation and reliability of the
pump.
Use of others special grades lubricants for special applications is allowed after GEV approval.
If a synthetic oil has been selected, GEV recommends its synthetic oil “TYPE SYG 880”
Caution:don’t mix different oil into the pump.
A specific procedure has to be applied to change standard oil by a synthetic oil.
This specific procedure has to be done by GEV
For any additional information and/or explanation please refer to our office .
GENERAL EUROPE VACUUM Srl
VIA DEL COMMERCIO 9
20090 BUCCINASCO (MI) ITALY
TEL. ++39 02 48841120
FAX ++39 02 4453957
e-mail: [email protected]
http://www.gevac.com
A.4 Transport, lifting, manipulation and stock
Pumps are supplied complete with electric motor. Usually the pumps are supplied with oil.
Avoid any other orientation while moving vacuum group. If the vacuum group keep in storehouse
without working for a long time, do the standard maintenance operations and change the oil into the
pumps. Check GEV technicians for the assistance.
For vacuum group lifting use the proper bands, balacing the weight properly, do not touch the
electric panel board, piping, filters. The transport has to be done with fork lift or trolley. Put a
wooden bare thru the tank feet, both side, and lifting up the vacuum group by means a fork lift. This
system allows to keep the vacuum group in horizontal position during the transfer. a wooden bare
put there in horizontal.or equip vacuum pump with a hook screwing it inside the proper threaded
hole.
Warning
Check if pump leaks oil because there is slip danger . Use proper lifting equipment and make sure
that all the safety norms have been observed.

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GP+GP – Maintenance book Pag.9 of 43
B. Installation of the vacuum groups GP+GP
B.1 Installation
It is essential to observe the following instructions, step by step, to ensure a safe start up. Group
start up shall have to be carried out by skilled and trained personell. Group must be installed on a
flat and horizontal surface. There are holes for securing the vacuum group to the floor.
Beware
Environmental temperature should be between 12°C. and 40° C. To ensure proper air cooling to the
pumps it is advisable to leave sufficient space to group side being sure that the motor cooling side is
free.
Moreover check to leave enough space close to the group allowing easy access to all the
components, for checking and having maintenance.
B. 2 Connection to system
The standard vacuum pump does not fit for being installed in explosion and hazard areas. Take
contact with GEV if you are planning to install it in such areas. Before installing pump, or in case of
maintenance, disconnect it from the electric mains to prevent the pump from running up suddently.
Vacuum pump must be installed by skilled and trained personell. Take all safety precautions.
B.2.1 Suction side
Warning
- Disconnect vacuum group from mains when connected to suction piping.
- Use flexible hoses either in suction and discharge so you can easily remove to have maintenance
- It is worthwhile to foreseen in suction an insulating ball valve
- The suction piping must at least have the same diameter of the pump connection .
A smaller piping can reduce the pumping speed. It is advisable to apply Loctite or Teflon
band to the threaded fittings for better tightness.
-The maximum suction pressure must not exceed the the atmospheric pressure
( around 1013 mbar ).Do not run the group with a suction pressure above this range.
- Both raw material and seals used for piping assembling must comply with sucked gases nature.
- If the sucked gas contains dust, it is absolutely necessary to equip vacuum pumps a filter
for dust additionally to the fine filter usually applied to pump suction inlet.
- In the event of steams suction, it is advisable to contact GEV in advance.
- No solid or liquid particles shall enter the pump.

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GP+GP – Maintenance book Pag.10 of 43
B.2.2 Exhaust side
The vacuum pumps type GP are equipped in exhaust by one or more oil remover cartridges
(according to the pump size) having a filtration in the range of 0,01 micron. When the oil remover
cartridges are clogged, smokes in exhaust is visible, the pump temperature and the absorbed power
gets increased and it may happen that the motor thermal protection switches on. It is advisable
therefore to replace the oil remover cartridges as per the notice stated in the next pages. The volatile
substances can enter the oil remover cartridge. We recommend you to connect a discharge hose fit
for any type of sucked gas. This is always necessary when the discharge gases are dangerous . At
the outlet is installed a common piping and a liquid trap with drain valve fit for stop any liquid
condensation.
Warning
Follow all the precautions when sucting process gases. The exhaust piping section must be at least
like the pump exhaust hose .If the exhaust pipe is too small an overpressure in the pump can
happen. Before installing exhaust piping check that the oil remover cartridge in exhaust are
properly tight. They could be relaxed during transport or installation. A relaxed filter can create
smoke in exhaust when running.
Warning
Do not run the group with clogged or reduced exhaust piping. Before pumps start up make sure that
blind flanges or valves inside the exhaust piping are opened and that the exhaust piping is not
clogged by foreign particles. The max exhaust pressure allowed must not be superior to 1.15 bar
(absolute) The exhaust piping and the accessories must be properly sized for the max displacement,
which is equal to the pumping speed of the pumps same. Possible reductions to exhaust reduce
pumping speed, increasing pump’s temperature and could overheat the motor or cause pump’s
pressure increase damaging tightnesses or other internal components.If you are sucting dangerours
gases, the exhaust piping must be tight.
B. 3 ELECTRIC CONNECTIONS
Warning
Check that electric main is off before connecting the junction box or in case you have to operate on
it- The connection to main must be carried out by a skilled technician and according to the safety
norms. Refer to the scheme underneath for connection.
Connect the feeding cables to the junction box. The European standards declare to protect the
electric motor with a proper device calibrated according to the datas shown on motor lable.

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GP+GP – Maintenance book Pag.11 of 43
Warning
If any motor or electric switch cuts the pump out. Re-start up of the pump can be carried out
only manualy. After having carefully checked the stopping reason.
Vacuum group can start up also when suction is already under vacuum.
After connecting motor and every time you alter the wiring, check motor rotation direction, check
the arrow shown on motor lable.During check, suction must be open. If motor rotation is wrong, oil
may be flushed back from the suction fitting (the vacuum system gets overpressed). Switch on the
motor for a while for checking the situation . If the motor rotates contrarily to the correct direction,
stops it immediately and inverte 2 phases of the electric connection to wiring. It is recommended to
check the motor rotating sense with device fits for indicating phases sequences.
A prolonged motor rotation in the wrong direction will damage the pump.
Supply includes electrical scheme, electric panel board legenda, electric panel board layout
B.4 Vacuum group start-up
Pumps must be filled up to the half of the oil sight glass. Always check that oil level & and motor
rotation are correct before start up pumps for the first time or before changing electric connections
The pumps can run to a temperature over 12° C.
-Turn on the key and the switch on the electric panel board
-Adjust the electric vacuum gauge with the alarm arrow on –350mmHg
-Select the priority on pump 1 or 2; switch on the pumps thru the switches in manual
-Pumps start up togheter: got selected vacuum level (on vacuum switch 1) of -550mmHg
the ” stand by” pump will stop. Other “ working “ pump, instead, will continue in
running till –700mmHg (selection on vacuum switch 2). Vacuum group starts/stops will
go head automatically by means of vacuum switches.
Warning
Before group start up check that the connected components are both matching with the final
application of the system
Do not expose body parts to vacuum as this might cause injure. Do not run the group with
and reachable intake.
Vacuum connections and fill-up/dreinage caps must not be opened during pumps running.
Any safety precautions should have to be taken for any specific application. This
refers particularly to installation, functioning and maintenance and for the exhaust
oils treatment and their transport.
Warning
Do not put the hand on suction intake for checking the efficiency. Exposure to vacuum of a body
part could lead blood concentration to the exposed part.

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GP+GP – Maintenance book Pag.12 of 43
B.5 Vacuum group running
Warning
Pumps when running are hot and some parts could reach a surface temperature of 80°C. Burning
risk in case of touching. Read carefully the warning printed on the red lable stickered to pumps.
B.5.2 Condensable gas and steam pumping
With option of gasballast valve and right temperature, vacuum pumps GP can suck water steams up
to the values written on each technical sheet. Gasballast can be opened with a tool. When it is
opened, noise level of vacuum pump gets increased. Before evacuating steams, it is advisable to
prewarm the pump for at least 30 minutes with closed suction and opened gasballast valve.
Important
Do not enter the group with condensable steams untill it reaches the correct temperature.
The gases sucked from process, when pumps is cold, are condensating into the oil.
In those processes where there is high percentage of condensable steams, suction must be opened
quietly and only after reaching the correct pump temperature.
Steams condensation in the pump is visible from oil-level increase during pump operation as steams
condensating are mixing with the oil.
Traces of condensable steam changes oil property causing corrosion or low lubrication to pumps
Therefore, if steams have been sucked, pumps must not be switched off soon after process because
condensate mixed up with oil could cause alteration or corrosion.
In order to prevent such problem, it is advisable to run the pump with the gasballast valve opened
and the suction closed untill the oil is free from mixture.
We recommend to let the pump run in this ways at least for 30 minutes after the process has been
completed. With water presence in the inlet is better to drain frequently the tank at atmospherical
pressure and install a by-pass piping to the tank.
B.5.3 Operating in cycles in/out
It is recommended to limit the pumps start up to 5 / 6 times in one hour. Regulate the Vacuum
switches to avoid many start up. Many start can demage electric motors and the pump coupling.
B.6 Vacuum switch regulation
The vacuum switch gives an electric contact in relation to the process vacuum level. This value can
be adjusted by an handle on the top of the vacuum switch and it stops the pump. The same pump
will start again automatically depending to the differential of pressure of vacuum switch. The
differential of pressure could be changed, from 1 to 10, as you can see opening the instrument. GEV
suggests to put it around 3-4, with value of 120-150mmHg.

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GP+GP – Maintenance book Pag.13 of 43
B.7 Pump stop
GP vacuum pumps are equipped in suction by an anti-suckback valve closing the suction when
vacuum pump is off keeping vacuum steady in all the connected appliances thus avoiding the flush
back of oil into the appliance same. Therefore, under normal circumstances, pump stops after
disconnection to mains.
Warning
If a vacuum pump has been disconnected due to the intervention of the thermalswitches or other
safeties, pump has to cool up to environmental temperature and start up must be manualy carried
out provided that stopping reason has been erased. For avoiding the sudden vacuum pump starts up
it is recommended to start it again manually.
B. 8 Ultimate pressure of the group
If the values stated in the technical sheets have not been achieved during process, measure the
ultimate pressure directly to pump suction inlet after its disconnection from system.
After a long period of storing and after oil changement,it is advisable to wait for a while before
pump reaches its max pressure. Infact vacuum pump must reach its functioning temperature while
the oil is degassing. The best max pressure can be achieved wih a low pump temperature and using
the recommended oils. The max vacuum level of the vacuum group can be changed by the vacuum
switches adjustments.
B.9 Assembling of gasballast valve – Option
Vacuum pumps type GP are supplied without gasballast. This gasballast can be assembled also
afterwards .
C. MAINTENANCE
Warning
Disconnect electric supply before disconnecting group. It is important that group does not start
up accidentally.
If vacuum group has sucked dangerous substances, check the nature risk and take the adequate
safety precautions. When sending back vacuum pumps to manufacturer, it is advisable to
indicate if these are free from dangerous substances. In that case, check nature risk.
Pumps must be properly packed so that it does not get damaged during transport and it does not
permit the pouring out of dangerous substances
When wasting the exhaust oil , follow the environmental norms, any intervention must be
skilled personell
Use only original spare parts
Maintenance or repairing being wrongly carried out or using unproper materials could
damage the pump
Maintenance or repairing must be carried out by skilled technicians as an uncorrect intervention
on pumps could affect their lifetime and performances thus cancelling the warranty.
Do not use weared gaskets, use new one.

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GP+GP – Maintenance book Pag.14 of 43
C.1 Maintenance schedule
The maintenance schedule stated in the maintenance sheet underneath are approximate values for a
normal function of the group. Difficult environmental conditions and/or aggressive gases can
increase significally the maintenance interventions.
CHECK AND MAINTENANCE FREQUENCY
Oil level check Daily
Oil conditions check Depending upon process
First oil change After 100 : 150 running hours
Subsequent oil change Refer to C.3 paragraph
Oil filter replacement Every oil change
Replacement of oil remover cartridge/s In case of oil mist in exhaust or yearly
Net cleaning Monthly
Check of anti-suckback valve Every 6 months
Oil cooler cleaning Yearly ( just for models from 45 to 300 )
Replacement of filter – gasballast Every 6 months or according to final application
Replacement od vanes and gaslets Every 2 years or when there are efficency
trouble
C. 2.1 Oil level
The pumps oil casing has two oil sight glasses.:
-at the bottom, where the oil must never go below
-at the top, for normal check of oil status
The oil status must always be in the middle of the oil sight glass.
If the pump has an oillevelswitch installed on it, fit for showing oil gauge, the oil level must cover
completly upper sight glass. The test must be carried out when pump is stopped
Greater oil consumption shows that the exhaust elements are clogged.The oil level must be checked
over once a day as stated in chart. When oil level in each pump is under emergency, a lamp will
light on the electric panel board by the oil level switch. Then, fill up the oil in the pump.
C. 2.2 Oil condition
Under normal conditions, oil looks transparent. If it gets black, must be changed.
Final pressure is compromized, if gases or liquids are mixed into the oil
It is possible to de-gas the oil by running the pump for about 30 mins. With closed suction and
gasballast valve opened (option).

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C.3 Oil change
Oil must be changed according to the following chart :
VACUUM PUMPS MOD.
GP – GPM 11 or 21 200 hours running Or every 1 / 2 months
GP – GPM 45-65-100 500 hours running Or every 3 / 4 months
GP – GPM 210– 308 1000 hours running Or every 5 / 6 months
WARNING
Pumps are hot when running, it is therefore necessary to use proper protections before acting on
surfaces under hot temperature.
Unscrew the oil drainage tap and let the oil flow into the proper tank carefully following the safety
norms.
Unscrew the oil filter. Take a new filter, damp gasket with oil and screw it on manually again.
Close the oil draining tap.
Unscrew the oil fill-up tap again and fill-up pump with fresh oil up to the bottom limit of the oil-
glass level, switch on the pump shortly and then change the oil again following the above
mentioned procedure.
Do follow all the environmental instructions when wasting exhausted oil
C.4 Replacement of the oil remover cartridges at discharge
When the oil remover cartridges in exhaust are clogged, this causes oil-mist in exhaust and an
excessive oil consumption. Oil remover cartridges need to be immediately replaced.
They must be replaced more often when subjected to oil-craking running at high-temperature and/or
aggressive gases.
. Take the cover away the oil-remover casing
. Unscrew nut, pull out the oil remover cartridges and replace them
During the dissassembling phase check that all the elements are correctly assembled.
Beware
Do not run the pumps without the oil remover cartridges. These, infact, do produce a differential
pressure inside the pumps, fit for keeping the oil in circulation. It is however recommended to
change the oil when replacing the oil remover cartridges.

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C.5 Electric motor disassemblig
WARNING
Check that motor cannot start and the electric main is off
For disassembling the electric motor unscrew the three screws which are coupling pump to turret.
Pull out the joint with fun from the motor’ shaft
Unscrew the 4 fixing screws from motor turret
After check out and replacement of the electric motor, reassemble all operating inversaly
Beware
In case of motor replacement, check the pump rotating sense following the described instructions
stated at B 4 paragraph.

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GP+GP – Maintenance book Pag.17 of 43
VACUUM SWITCH
D.1 Regulation
Open and close the valve (pos.5) up the Vacuum switch code no. 62007. If rotate it, the switching
vacuum level change (check the value thru the glass). Remove the mask and change from 1 to 10
the wheel (pos.19). It can change the delta pressure from pump start to stop.
See below the diagram.
This differential need to be add to the starting set-point installed before to get the max working
pressure.
1 2 3 4 5 6 7 8 9 10
MIN MAX
REGOLAZIONE
GHIERA
BAR
mmHg
0,1 0,2 0,3 0,4
0,15 0,25 0,35
187.575 112.5 150 262.5225 300
TABELLA TARATURA DIFFERENZIALE

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GP+GP – Maintenance book Pag.18 of 43
E. TROUBLESHOOTING GUIDE
FAULTS CAUSES REMEDY
Pump does not
start or the
thermal device
starts after few
Motor is not properly connected
The thermal device has not been
properly adjuested
The Volts do not fit with the motor’s one
Pump is stucked
Connect motor correctly
Readjust the thermal device
Replace motor
Replace pump
Pump does not
start easily, vanes
noise and higher
power absorption
The rotating sense is uncorrect
The oil temperature is too low, ( less
then 12°C)
Oil is too viscous
Pump has been stopped since long time
Oil remover cartridges are weared
Exhaust piping is clogged
Change the rotation direction
Heat the environment and
t
he oil with a less viscousity one
Use the correct oil
Let pump run with closed suction
untill hot
Replace the oil remover cartridges
Clean all the exhaust piping
Pump does not
reach the stated
Tag vacuum
Measuring instrument is damaged or
unsuitable
Leaking from both oil and suction
pipings
Anti-suckback valve on suction does not
work properly
Misfunctioning of the floating valve, of
the oil recovery group or discharge
bulkward
Oil missing in the pump
Shaft seals out of order or uncorrectly
positioned
Poor lubrication due to :
. unsuitable or contaminated oil
. oil filter clogged
. oil pipings clogged
Vacuum line is dirty
Pump is too small
Check the measuring technique and
the used instruments
Check and tighten all fittings housed
both on suction pipings and oil
Check and repair the anti-suckback
valve
Check all the components
Fill up pump with oil
Replace the tight rings
Change the oil and in case degass it
Clean the oil lines
Clean the vacuum line
Check out the process details and in
case replace the pump
Lower pumping
speed Suction net filter is clogged
Oil remover cartridges are clogged
Non return valve does not open easily
Suction piping is not tight
Clean the net filter. Check if you need
a proper anti-dust filter in suction
Replace the oil remover cartridges
Check and release the spring

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GP+GP – Maintenance book Pag.19 of 43
The pump is too
hot Cooling air is not enough
Piping or fan is dirt
Too high temperature of the gas aspired
Insufficent oil quantity in the pump
Oil recyrculation piping obstructed
Oil filter is dirt
Oil remover cartridge or discharge line
are clogged
Place the pump in a more aired
location
Clean with air or solvent
Verify the system and the reiability of
the pump
Restore oil level
Verify and clean
Replace oil filter
Replace oil remover cartridges and
verify the discharge
The pump leaks
oil Fittings and oil cyrculation piping are not tight or are spoiled
Shaft seals too much used
Oil remover cartridges are clogged
Verify the fittings, tight them, verify
the pipings and eventually replace
them
Replace the seals
Replace the cartridges
Oil in the system
or in in the
suction piping
Oil comes from the system
The check valve is clogged or spoiled
Oil level is too high
Verify the system to the process
Verify the suction fitting
Clean or repair the check valve
Drain the oil excess
The pump has a
huge
consumption of
oil
Oil mist at the
discharge
Oil remover cartridges are spoiled or out
of their position
Oil level is too high
Replace the cartridges and verify the
correct placement in the oil remover
Drain oil excess
Oil is dark Oil has been used for too many hours
Oil is not the correct one
Oil is burned by the too high temperature
of the pump
Drain oil and replace it
Replace oil filter and oil remover
cartridges
Oil is turbid Condensation of water and mist sucted
by the pump in the oil Degas the oil opening the gas ballast or replacing the oil
Verify if the process need a
condensate trap at pump suction
The motor runs
while the pump
doesn’t
The coupling insert is broken
Verify and replace
The pump is
stopped and the
motor doesn’t
start
The pump is without oil
The blades are broken Verify and fill-up Verify and replace the blades
Pump is
excessively noisy Oil level is very low or not visible Oil filter is clogged
Coupling element is spoiled
Large vacuum leak in the system
Add oil
Replace the filter and the oil
Verify and install a new coupling
Repair vacuum leak

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GP+GP – Maintenance book Pag.20 of 43