Gardner Denver Wittig SLS 34 Guide

T-BA/ET-1250-0-GB
September 2013
SLS 34-54
Operating Manual
and Spare Parts List
(Original Instructions)

2 T-BA/ET-1250-0-GB-10-11
Contents
Contents
1.0 Technical data................................................. 3
2.0 Safety regulations ........................................... 5
2.1 Proper use........................................................5
2.2 Acceptance and monitoring..............................5
2.3 Hazard symbols and signs ...............................5
2.4 Pictographs used..............................................5
2.5 Safety at work...................................................5
3.0 Transport......................................................... 7
3.1 Transport ..........................................................7
3.2 Storage............................................................7
3.3 Scope of supply...............................................7
4.0 Installation....................................................... 8
4.1 General.............................................................8
4.2 Assembly..........................................................8
4.2.1 Stationary operation..............................8
4.2.2 Installation in vehicles...........................8
4.3 Power transmission ..........................................8
4.3.1 Articulated shaft drive ...........................8
4.3.2 V-belt drive............................................9
4.3.3 Coupling drive.......................................9
4.4 Pipelines...........................................................9
4.5 Safety and monitoring equipment.....................9
4.5.1 Check valve...........................................9
4.5.2 Safety valve...........................................9
4.5.3 Vent valve............................................10
4.5.4 Float valve...........................................10
4.5.5 Pressure gauge/vacuum gauge ..........10
4.5.6 Thermometer ......................................10
4.5.7 Touch guard ........................................10
4.5.8 Silencer...............................................10
4.5.9 Intake air filter......................................10
4.5.10 Vacuum filter .......................................10
5.0 Commissioning ............................................. 11
5.1 Prior to commissioning...................................11
5.2 Oil tank...........................................................11
5.3 Shut-off fittings ...............................................11
5.4 Prelubricate....................................................11
5.5 Direction of rotation........................................11
5.6 Drive...............................................................11
5.7 Check operating parameters..........................11
5.8 Check safety valves........................................11
5.9 Version with four-way cock.............................11
6.0 Operation ...................................................... 13
6.1 Restarting.......................................................13
6.2 Regular inspections........................................13
6.2.1 Safety valve.........................................13
6.2.2 Vent valve............................................13
6.3 Possible operating errors................................14
6.4 Action for prolonged standstill ........................14
6.5 Flushing after excess intake...........................15
6.6 Troubleshooting..............................................15
7.0 Maintenance.................................................. 17
7.1 Warranty.........................................................17
7.2 Maintenance, maintenance schedule.............17
7.2.1 Cooling................................................17
7.2.2 Rotary compressor/
Compressor vacuum pump.................18
7.2.3 Vacuum filter.......................................18
7.2.4 Combination intake air filter ................18
7.2.5 V-belt and belt tension ........................19
7.2.6 Clean the oil tank................................19
7.2.7 Check valve.........................................20
7.2.8 Vent valve............................................20
7.2.9 Rotary slide valve rate of wear............20
8.0 List of spare parts ......................................... 21

1.0 Technical data
T-BA/ET-1250-0-GB-10-11 3
1.0 Technical data
Rotary compressor
DIAGRAM 1. Dimensions of rotary compressor
Parameters Unit Type SLS 34 Type SLS 54
Quantity of air with clear throughput m3/h 200 325
Volumetric flow rate at an operating pressure of 2 bar gauge m3/h 180 300
Intake temperature °C 20 20
Intake pressure bar a (absolute) 1 1
Maximum operating pressure bar g (gauge) 2 2
Permissable Speed Range rpm (min-1) 1000 - 1500 1000 - 1500
Power requirement at the shaft at 2 bar gauge kW 9,5 15,5
Motor power required kW 11 18
Oil consumption l/h 0,07 0,09
Mass moment of inertia kgm20,05 0,07
Weight with check valve kg 62 81
Weight with foundation plate, without motor kg 160 200
Sound pressure level at a distance of 7 metres at 2 bar gauge dB(A) 79 81
Capacity of the oil tank l 2,6 2,6
Dimensions
(mm) SLS 34 SLS 54
A 420 510
E 100 165
F 130 195
G 198 243
H 150 195
Ø S M10 M14
3 = Intake side Y = Oil filler inlet
4 = Delivery side Z = Oil drain
X = Dip stick RV = Check valve

4 T-BA/ET-1250-0-GB-10-11
1.0 Technical data
Compressor vacuum pump
DIAGRAM 2. Compressor vacuum pump dimensions
The check valve is fitted in the four-way cock.
Dimensions in mm
Parameters Unit Type SLS 34 DV Type SLS 54 DV
Quantity of air with clear throughput m3/h 200 325
Volumetric flow rate with residual pressure 400 mbar / 60 % vacuum m3/h 185 310
Maximum Operating Pressure with 4-way valve bar g (gauge) 1,5 1,5
Maximum Operating Pressure bar g (gauge) 22
Permissable Speed Range rpm (min-1) 1000-1500 1000-1500
Power requirement at the shaft at 0.5 bar (absolute) kW 5,7 10
Oil consumption l/h 0,06 0,08
Mass moment of inertia kgm20,05 0,07
Operating vacuum during continuous operation (where suitably
designed) mbar/% 200/80 200/80
Sound pressure level at a distance of 7 m at 400 mbar/0.5 bar excess
pressure dB(A) 70/74 70/74
Capacity of the oil tank l 2,6 2,6
Weight with check valve kg 62 81
Dimensions (mm) SLS 34 DV SLS 54 DV
A 420 510
E 100 165
F 130 195
G 198 243
H 150 195
Ø S M10 M14
X = Dip stick Z = Oil drain
Y = Oil filler inlet

2.0 Safety
T-BA/ET-1250-0-GB-10-11 5
2.0 Safety
2.1 Proper use
The rotary compressor, respectively the compressor
pump, is exclusively intended for the compression,
respectively the extraction of filtered air. Any other
type of use is deemed to be improper.
Proper use also includes compliance with the operat-
ing data and the maintenance specified in the operat-
ing manual.
2.2 Acceptance and monitoring
The machine as such is not subject to any general
acceptance and monitoring requirement.
Where special regulations apply at the place of use of
the rotary compressor/compressor vacuum pumps,
the operator is responsible for complying with these
regulations.
The safety at work regulations of the local health and
safety executive must be observed in any event.
2.3 Hazard symbols and signs
The following hazard symbols and signs can be used
in the operating manual:
Hazards for people! In line with the safety
at work requirements, such references
must be precisely observed. All users
must be aware of the safety notes!
ATTENTON! is used for reference to
those directives and regulations that pre-
vent damage to the machine.
Important information!
Note environmental protection regula-
tions!
2.4 Pictographs used
The following pictographs can be used on the
machine:
Danger!
Attention Electricity!
Read the operating manual carefully!
Wear hearing protection!
Hot surfaces; risk of burns!
No access without authorization!
Noise absorbing cover ventilation auto-
matically switches ON/OFF.
2.5 Safety at work
The rotary compressor/compressor vac-
uum pump is designed according to the
latest state-of-the-art and the acknowl-
edged safety regulations. Nevertheless,
hazards may arise through their use for
the life and limb of the user or of a third
party, respectively damage may occur to
the machine or other property.
•The machine may only be used when it is in a tech-
nically perfect condition in accordance with the
intend use and in line with the safety requirements.
Any defects of relevance where safety is con-
cerned must be rectified immediately.

6 T-BA/ET-1250-0-GB-10-11
2.0 Safety
•Alterations, attachments or conversions to the
rotary compressor/compressor vacuum pump,
which may affect safety, are not permitted without
consulting the manufacturer.
•All warnings on the machine must be observed
and must be kept in a fully legible condition.
•Fire alarm and firefighting possibilities must be
observed.
•Work on electrical equipment must only be carried
out by a qualified electrician.
Before carrying out any work, the staff
instructed to work on the machine must
have read the chapter in the operating
manual entitled “Safety Regulations”.
Doing so once work has started is too
late!
•Work may only be carried out on the machine
when it is at a standstill.
•Before starting work, secure the machine to pre-
vent restarting.
•The system must not be pressurized or contain a
vacuum when work is being carried out on the
machine.
•Vehicle side: Close shutoff valve. Vent, respec-
tively aerate delivery pipe between system and
shut-off valve.
•Use the safety valve so as to manually release
excess pressure, respectively vent the machine by
means of the ventilation valve.
•Note pressure gauge reading!
•Only remove the safety devices from the drive
when the machine is at a standstill.
•The shock-hazard protection may only be removed
when the machine and the delivery pipe has coo-
led down.
•Before starting the machine, ensure that all protec-
tive fixtures have been reattached.
Environmental safety requires the collec-
tion and safe disposal of all fluids that
may escape during maintenance work,
e.g. lube oil.

3.0 Transport
T-BA/ET-1250-0-GB-10-11 7
3.0 Transport
Symbols on the packaging:
Top!
Fragile!
Store in a dry place!
3.1 Transport
During transportation avoid force and
careless loading and unloading. The
machine may only be suspended on
firmly screwed in eyebolts (arrow).
DIAGRAM 3. Compressor with transport eyebolt
Possibly attached transportation safeguards must be
removed.
3.2 Storage
Prior to fitment, the machine must be stored in a dry,
heated room. Prior to final assembly, leave the covers
in place on the delivery socket.
The preservation of the bright parts lasts
for about 1 year. For prolonged storage,
this must be reapplied.
3.3 Scope of supply
The content of the shipment is listed on
the delivery note. Check immediately to
ensure that the shipment is complete.
Damage during shipment as well as
errors can only be acknowledged provi-
ded written notification is given without
delay.

8 T-BA/ET-1250-0-GB-10-11
4.0 Installation
4.0 Installation
4.1 General
The air-cooled rotary compressor (SLS 34 / SLS 54)
and vacuum pumps (SLS 34 DV / SLS 54 DV) gene-
rate pressure or vacuum. For constant duty they are
designed for a maximum pressure of 2 bar or a
vacuum of 100 mbar (90 %).
A ventilator fastened on the end of the drive shaft
cools the compressor. The automatic lubricating
device is driven by the rotor shaft. For V-belt propul-
sion, the pulley wheel can be placed directly on the
end of the compressor shaft, provided the radial load
does not exceed 105 kg.
4.2 Assembly
4.2.1 Stationary operation
Assemble the compressor bolted on the foundation
panel in a vibration-free manner. A concrete founda-
tion is not required. Using bolts, fasten the foundation
panel on the surface.
Drive
When driven by an electric motor, the compressor
must be precisely aligned with the motor. Ensure cor-
rect spacing of the wobbler (about 3-5 mm). Switch
motor on briefly and check direction of rotation (see
arrow on fan cowl of the compressor).
Coupling
The coupling must be of a resilient design and must
not transmit any axial thrust from the motor to the
compressor.
4.2.2 Installation in vehicles
The installation site for the compressor must be easily
accessible and protected against falling objects. The
compressor must be firmly bolted on the chassis. Suf-
ficient space must be provided for connection of the
delivery and intake pipes.
4.3 Power transmission
The power is transmitted by an articulated shaft, a V-
belt or a coupling.
4.3.1 Articulated shaft drive
The articulated shaft must be designed as a
•spline shaft and must be
•balanced, as well as having the
•smallest possible angle and must be as short as
possible.
The centre axes of the articulated shaft flanges must
be parallel to each other.
The articulated shaft attachment flange is to be
pushed on the drive shaft of the rotary compressor /
the vacuum pump.
The spline shaft section of the articulated shaft must
be bolted on the attachment flange of the compressor
shaft.
The resultant prop. shaft angle must not exceed 15° at
a speed of 1500 min-1.
Do not fit the drive shaft the wrong way -
observe the marking!
1 Rotary compressor 3 Marking
2 Spline shaft 4 Drive
DIAGRAM 4. Drive shaft
The machine must be adequately
earthed.
An earth bonding strap should be
securely fastened between the machine
body and a suitable point on the vehicle
frame.
Ensure that the machine and all ancil-
liaries are earthed inaccordance with
BS5958 Pt1: 1991; 'Control Of Undisira-
ble Static Electricity'.

4.0 Installation
T-BA/ET-1250-0-GB-10-11 9
4.3.2 V-belt drive
V-belt drive is recommended where the motor speed
needs to be transformed or reduced.
Note nominal speed according to „1.0
Technical data“ on page 3!
The V-belt pulleys listed in the following diagrams can
be placed directly on the free end of the shaft.
DIAGRAM 5. V-belt pulley for SLS 34
DIAGRAM 6. V-belt pulley for SLS 54
Carefully and precisely align the axes in all planes,
both for the driving as well as for the driven shaft!
The grooves of the belt pulley must not be offset.
The selected length of the V-belt is decisive for uni-
form belt tension.
The tension setting for the V-belts must allow them to
be depressed by about an inch.
4.3.3 Coupling drive
see „Stationary operation“ on page 8.
4.4 Pipelines
Remove the dummy flanges and plugs from all pipe-
lines, in addition thoroughly clean all pipes prior to fit-
ting.
Condensate traps with drain cocks must be fitted at
the lowest point of the outlet pipes, in particular in
riser pipes.
4.5 Safety and monitoring equipment
4.5.1 Check valve
For compressor and vacuum pumps, the check valve
(8) is to be fitted in way of the intake fitting (7)
(Diagram 7 on page 12).
On machines with a four-way cock, the
check valve is fitted inside the cock!
4.5.2 Safety valve
In accordance with the applicable regulations, a non-
lockable safety valve must be fitted downstream of
every compressor.
The size and setting of the safety valve must be
selected so that the highest permissible pressure is
not exceeded by more than 10 %.
It must be able to blow-off the complete quantity sup-
plied by the compressor.
The safety valve must be fitted with a manually opera-
ted vent.
Important installation instructions:
•Install directly downstream of the com-
pressor and upstream of every shut-off
fitting.
•The component markings by the TUV and the
security seals must be present.
•Adjust in accordance with the permissible opera-
ting pressure (see „Technical data“ on page 3.).

10 T-BA/ET-1250-0-GB-10-11
4.0 Installation
•The safety valve must be secured so as to prevent
unauthorized or mistaken manipulation.
•The safety valve must not be blocked.
•The safety valve must not be used for controlling
the amount of air during compression.
4.5.3 Vent valve
The vent valve for the vacuum pump is
used for controlling the system and for
safeguarding the intake pipe. It must be
fitted!
The size and setting of the vent valve must be selec-
ted so as to ensure that the intake pressure is restric-
ted to the permissible minimum of 200 mbar.
4.5.4 Float valve
Where the vacuum pump is at risk of a fluid intake, an
automatically closing float valve must be fitted in the
intake pipe.
4.5.5 Pressure gauge/vacuum gauge
Design the pressure gauge/vacuum gauge according
to the maximum achievable operating pressure/
vacuum. Install immediately downstream of the deli-
very socket.
4.5.6 Thermometer
The thermometer for measuring the final compression
temperature must be installed in the pressure pipe
directly downstream of the delivery socket. It must
have an adequate range for the type of use.
The constant temperature of the compressed air must
not exceed 180 °C. Higher temperatures are briefly
permitted during vacuum operation,
4.5.7 Touch guard
The moving and hot parts of the machine must be fit-
ted with a touch guard.
4.5.8 Silencer
The air escaping from the vacuum pump produces a
loud noise. To reduce the sound level, we recommend
the fitment of our silencer.
4.5.9 Intake air filter
The air filter may only be fitted horizontally. It must not
face down towards the clean air socket, since dirt
might enter the clean air pipe during cartridge remo-
val, and may thus enter the compressor which would
affect the dust removal by the presettling tank.
It must be ensured that the arrow in the
“TOP” marking on the dust collection tank
points upwards.
4.5.10 Vacuum filter
The vacuum-tight filter provides protection against
mechanical impurities. Install in the intake pipe!
During installation note the following:
•Direction of flow,
•Space for changing the filter insert.
Vacuum filter SFA is not suitable for
excess pressure.
Vacuum filters of series VFD are pres-
sure surge proof up to 11 bar.

5.0 Commissioning
T-BA/ET-1250-0-GB-10-11 11
5.0 Commissioning
When commissioning the machine, the
safety regulations (see „Safety“ on
page 5.) and the additionally applicable
accident prevention regulations must be
observed.
Commissioning and all associated work may only be
carried out by suitably skilled personnel.
5.1 Prior to commissioning
Read the operating manual!
Train the operating personnel!
Carry out a visual inspection of the
machine!
5.2 Oil tank
Fill the storage oil tank (2) up to the lower edge of the
thread on the oil tank (Diagram 7 on page 12).
Oil tank capacity = 3.4 litres /
Useful capacity = 2.9 litres
Never allow the oil level to drop below the
minimum (lower notch on the oil dipstick
(4) level)!
After filling firmly close the plug (1) of the oil tank.
5.3 Shut-off fittings
Open all manually operated valves and slide valves on
the system.
5.4 Prelubricate
To prelubricate, inject about ¼ litre of oil in the intake
socket. Repeat every 15 minutes during the initial 1-2
operating hours.
5.5 Direction of rotation
Briefly switch on the drive and check the direction of
rotation according to the arrow on the housing.
5.6 Drive
Switch on drive and check whether pressure/vacuum
is produced.
5.7 Check operating parameters
Check pressure/vacuum, speed and temperature
according to the identification plate and technical data
(see „Technical data“ on page 3.)
5.8 Check safety valves
Check that the safety valves blow off!
5.9 Version with four-way cock
Link the connection (8) (R 2”) on the change-over
four-way cock with the tank.
Using a short pipe, an exhaust silencer can be fitted
on the connection (7) (R 2”), so as to effectively
dampen the exhaust noise. An agitating lance can be
operated here via a flexible tube.
The fitted change-over four-way cock (5) has the posi-
tion 9 = “Suction” and 10 = “Pressurise”.
The changeover lever must always be
pushed against the pertinent stop. An
intermediate setting is not permitted
whilst the machine is operating!
When the machine is at a standstill, the tank can be
quickly aerated or vented with an intermediate posi-
tion.

12 T-BA/ET-1250-0-GB-10-11
5.0 Commissioning
9 5 10 Lever position “Pressurize” 4 1
7 Exhaust, respectively intake pipe (R 2”) 8 to Tank (R 2") 2 3
DIAGRAM 7. Compressor

6.0 Operation
T-BA/ET-1250-0-GB-10-11 13
6.0 Operation
6.1 Restarting
The rotary compressor, respectively the compressor
vacuum pump is normally started as specified in
Chapter 5 “Commissioning”.
6.2 Regular inspections
During compression operation
Check working pressure on the pressure gauge (the
permissible pressure is listed on the rating plate of the
machine).
During vacuum operation
Check operating vacuum on the vacuum gauge (the
permissible vacuum is listed on the rating plate of the
machine).
Final compression temperature
Read off the final compression temperature
Depending on the operating condition,
the compression temperature can also
be well above the stated figures (up to
about 200 °C)!
Drain off condensate
Drain off condensate from the condensate and safety
tanks.
The system must not be pressurized
when draining off the condensate.
There is a risk of freezing during the win-
ter!
Speed
Check the operating speed.
Oil level
Read off the oil level from the inspection glass of the
storage tank.
Top up with lubricating oil when the oil level reaches
the red marking.
Lube oil specification (see „Recommended lubricant“
on page 22.)
6.2.1 Safety valve
In accordance with accident prevention regulations, a
safety valve without a cut-off must be fitted in the pres-
sure pipe downstream of every compressor. It must be
set so as to prevent the maximum permissible opera-
ting pressure being exceeded by more than 10 %.
The valve setting must be secured to pre-
vent unauthorized or incorrect alteration.
The safety valve must not be blocked or
manipulated in any other manner.
Blowing off the complete volumetric flow
via the safety valve with a closed pres-
sure pipe must be avoided, since this
may result in the occurrence of dange-
rous compressive oscillations.
The safety valve must not be used as a
pressure control device.
Usage as a control device can cause
damage to the valve!
The safety valve selected must be sufficient to permit
the complete volumetric flow rate to be blown off via
the valve when suitably pressurized.
Check function during commissioning and subse-
quently every week by actuating the manual vent
when the machine is operating.
6.2.2 Vent valve
The vent valve is the controller for a vacuum system.
It opens when the set vacuum is achieved and permits
the vacuum pump to take in additional atmospheric
air.
Ensure function every week by testing whilst observ-
ing the vacuum gauge on the intake socket of the
compressor vacuum pump.
Do not exceed the permissible vacuum of
200 mbar.

14 T-BA/ET-1250-0-GB-10-11
6.0 Operation
Monitoring periods
6.3 Possible operating errors
Operating errors can cause machine
failure.
To be avoided at all costs:
•Excessively low or high speeds
•Excessive pressure
•With the pressure pipe closed, blow off the total
volumetric flow through the safety valve
•Vacuum too low
•Compressed air temperature too high (see 6.2)
•Poor cooling (affecting supply of cooling air)
•Blocked vacuum filter
•Block exhaust silencer
•Intake of fluid
•Water hammer due to failure to drain away con-
densate in time from the safety tanks (risk of freez-
ing in winter)
•Lack of lube oil
•Wrong lube oil
•Do not open tank when vacuum is applied
•Empty only with pump at a standstill
In the event of damage due to operating
errors, no warranty claim can be submit-
ted to Gardner Denver.
6.4 Action for prolonged standstill
•Clean the machine thoroughly.
When cleaning with a pressure washer,
there is a risk of water penetration.
•After wet cleaning, run machine for several minu-
tes until warm so as to prevent the rotary slide
valve from sticking.
Where the rotary compressor/compressor vacuum
pump fitted in the vehicle is to remain unused for more
than one month, we recommend operating the
machine once each month for at least 15 minutes.
This will ensure a fresh supply of oil to all components
that are endangered by corrosion.
see chapter
During
operation
every 10 -
20 minutes
after every
use daily weekly
Operating speed 6.2 •
Operating pressure, respectively vacuum Identification
plate •
Air outlet temperature 6.2 •
Drain off condensate (contains oil!)
Silencer oil trap
Safety tank
6.2
•
•
Oil level 6.2 •
Actuate safety valve 6.2.1 •
Actuate vent valve 6.2.1 •
Clean the machine •
Clean air intake and outlet openings •
Check fastening of the fan cowl and cover
panels •

6.0 Operation
T-BA/ET-1250-0-GB-10-11 15
6.5 Flushing after excess intake
Proceed as follows after excess intake (liquid or
sludge has entered the machine):
•Unscrew the plug in the intake socket (disassem-
ble possibly attached additional lubrication pipe).
•Open vehicle tank so that the machine can be ope-
rated without producing a vacuum or pressure.
•Switch on machine and at slightly reduced speed
take into the machine about ½ litre diesel-oil mix-
ture through the bores in the intake socket.
•Switch off machine, screw in plug and pre-grease
as specified in Chapter 5.4 before restarting the
machine.
Intermediate settings of the change-over
four-way cock are not permitted during
the flushing procedure. The flushed out
dirt could partly return to the intake side.
6.6 Troubleshooting
Gardner Denver rotary compressors and compressor
vacuum pumps, are noted for the low rate of wear of
the rotary slide valves during normal use. If a fault
should arise, the summary below provides you with
the possibility of being able to determine the cause
and rectify the fault.
Defect Possible cause Rectification
Capacity of the compressor/vacuum pump
decreases •Vacuum filter or combination air filter
fouled
•Leaky intake pipe
•Leaky fittings
•Speed too low
•Premature wear of the rotary slide valve;
fouling (water, dirt, …) may have entered
the machine (e.g. when the machine has
experienced excess intake).
•Clean the filter
•Find and seal leaks
•Replace fittings
•Maintain speed range
•Replace rotary slide valve or have
machine overhauled in an authorized
workshop
Unusual noise •Machine is poorly aligned
•Bearing worn out
•Lack of lube oil
•Unsuitable lube oil
•Rotary slide valves knock due to worn
width
•Housing bore has grooves or undulations
due to dirt intake
•Wrong speed
•Changed pressure
•Changed vacuum
•Align machine precisely
•Have bearings replaced
•Top up oil, clean oil tank and intake
screen
•Fill with oil according to lube oil table
•Replace rotary slide valve
•Have housing bore re-turned and honed
in authorized workshop. With
considerably fouled intake filter, fit
microfilter.
•Maintain speed limits
•Maintain nominal pressure
•Maintain nominal vacuum / check exhaust
system and clean where necessary.

16 T-BA/ET-1250-0-GB-10-11
6.0 Operation
If it is impossible to overcome the problem with the
above action, please contact our customer service
department.
The machine may only be used again
when the fault has been completely
rectified.
Compressed air temperature too high •Excessive final pressure
•Exhaust silencer blocked
•Change-over four-way cock in wrong
position
•Valve plate in check valve sticks
•Vacuum filter blocked
•Excessive vacuum
•Maintain nominal pressure
•Replace exhaust silencer
•Switch change-over four-way cock
correctly
•Clean check valve
•Clean vacuum filter
•Maintain nominal vacuum
Operating pressure, respectively operating
vacuum is not achieved •Incorrect display by pressure gauge,
respectively vacuum gauge
•V-belt slips
•Change-over four-way cock in wrong
position
•Condensate drain cock open
•Replace pressure gauge, respectively
vacuum gauge
•Check belt tension, retighten where
necessary
•Switch change-over four-way cock
correctly
•Close condensate drain cock
Sludge or liquid has penetrated inside the
machine •Vehicle has experienced excessive intake •Flush with diesel-oil mixture at the lowest
possible speed and without pressure or
vacuum, subsequently fill with lube oil as
shown under “Commissioning”
Excessive power requirement •Excessive speed
•Excessive final pressure
•Pressure gauge reading incorrect
•Exhaust silencer blocked
•Maintain speed limit
•Maintain nominal pressure, actuate/check
safety valve
•Replace pressure gauge
•Replace exhaust silencer
Lack of lube oil despite full oil tank •Oil tank intake screen blocked •Clean oil tank and intake screen
Safety valve blows off •Closed valves in pressure pipe
•Blockage in delivery network
•Blockage of the exhaust silencer
•Open valve
•Eliminate blockage
•Replace exhaust silencer
Vent valve actuates •Closed valves in intake pipe
•Intake filter blocked
•Open valve
•Clean intake filter, replace filter cartridge
where necessary
Compressed air escapes from shaft end
and oil leaks •Seals are damaged •Have radial shaft seals in cover replaced
Smell of rubber (with V-belt drive) •V-belt slipping due to insufficient belt
tension
•Excessive final pressure
•Check belt tension, retighten where
necessary
•Maintain nominal pressure
V-belts shifting •Insufficient belt tension
•Worn V-belt
•Pulleys are not aligned
•Worn pulleys
•Check belt tension, retighten where
necessary
•Fit new V-belt
•Align pulleys
•Replace pulleys
Defect Possible cause Rectification

7.0 Maintenance
T-BA/ET-1250-0-GB-10-11 17
7.0 Maintenance
7.1 Warranty
Please note that we accept no liability in the event of
failure to comply with the installation and operating
manual.
It should be noted that repairs on the rotary compres-
sors, respectively compressor vacuum pumps may
only be carried out by authorized workshops using ori-
ginal spare parts; failure to comply with this require-
ment will result in the warranty becoming void. A list of
our customer service stations is separately enclosed
with the order documentation.
7.2 Maintenance, maintenance schedule
Please follow the safety notes on page 5
when carrying out maintenance and
inspection work.
Disturbances due to inadequate or improper mainte-
nance can incur very high repair costs and prolonged
machine downtime. Regular maintenance is thus
essential.
The operating safety and service life of the machine
depends primarily on proper maintenance.
The following table contains time, control and mainte-
nance information for normal use of the machine.
The stated maintenance periods are based on a daily
operating time of about 5 hours. The maintenance
period can be extended if the specified number of
operating hours is not achieved.
Due to the different operating conditions it is impossi-
ble to predict when the check up for wear, repairs,
maintenance and inspections will be required. A suita-
ble inspection routine needs to be specified in accor-
dance with your operating conditions.
Upon completing the work, the protective
devices must be properly reattached.
When removing oil, grease, solvents or
parts, e.g. filter cartridges, please com-
ply with the regulations for safeguarding
the environment.
7.2.1 Cooling
The cooling air requires a free passage.
Check the cooling air inlets and outlets every week
and clean away the adhering dirt and dust where nec-
essary.
For an optimum cooling effect, unrestric-
ted circulation of the air is essential. Fou-
ling reduces the cooling effect and can
cause the machine to overheat and fail.
Maintenance schedule
Maintenance points Type of work see Maintenance periods
Chapter 1 week 1 month 3 months
Cooling air guide check, clean 7.2.1 •
Compressor vacuum pump clean 7.2.2 •
Vacuum filter clean 7.2.3 •
Combination air filter check, clean 7.2.4 •
Safety valve check 6.2.1 •
Vent valve check, clean 6.2.2 •
V-belt, belt tension check, retighten 7.2.5 •
Oil tank clean 7.2.6 •
Check valve check 7.2.7 •
Vent valve check, clean 7.2.8 •
Rotary slide valve Check for wear (intake flange) 7.2.9 •

18 T-BA/ET-1250-0-GB-10-11
7.0 Maintenance
7.2.2 Rotary compressor/Compressor
vacuum pump
The machine must be cleaned every week.
When washing respectively cleaning with
a pressure washer, there is a risk of
water penetration, which can cause water
hammer and thus machine failure.
Carefully clean the oil sight glass.
After wet cleaning, run machine for several minutes
until warm so as to prevent the rotary slide valve from
sticking.
7.2.3 Vacuum filter
Clean filter in line with the amount of fouling on a daily
basis, at least, however, once weekly.
When the vent valve actuates the vac-
uum filter must be cleaned as a matter of
principle.
The filter element consists of a high-
grade steel fabric or a microfilter cart-
ridge.
Opening the filter
Release or unscrew the tapered respectively star
knob. On type SFA turn the cover about 15° counter-
clockwise away from the stud bolts and then remove
the cover from the housing. On type SFD the cover
can be simply removed.
Cleaning the filter
•Wash the filter housing with gasoline or cold
degreaser.
•High-grade steel filter inserts can be washed with
gasoline or cold degreaser.
•The microfilter cartridge filter element can be
cleaned by blasting inside and out with a steam
cleaner. Check the microfilter cartridge for dam-
age. A damaged cartridge must be replaced.
•Check the round seal or gasket for damage.
Replace damaged sealing rings.
When cleaning the filter housing, take
steps to prevent any dirt, wadding or
liquids from entering the compressor/
vacuum pump. These may cause valve
breakage.
Assembling the filter
Insert filter cartridge.
Place gasket, respectively round seal in cover. Push
washers outwards against the tapered or star knob.
Push cover into the housing (on type SFA, turn cover
clockwise into the studs).
Tighten cover with tapered or star knob.
7.2.4 Combination intake air filter
Compress the dust removal valve every week to check
for considerable accumulations of dust.
The service indicator provides information about the
condition of the filter cartridge in the air intake filter.
The filter cartridge must be replaced
when the red marking is visible on the
service indicator.
Replacing the filter cartridge
1. Switch off the compressor.
2. Remove cover with dust removal valve.
3. Using a wrench, unscrew the hexagonal nut.
4. Remove fouled cartridge and throw away.
5. Using a moist rag, clean the filter housing in
particular along the seal of the filter cartridge.
6. Take care to ensure that no dust can enter the
clean air pipe.
7. Insert new cartridge in the filter housing.
8. Using a wrench, tighten the hexagonal nut.
9. Attach cover.
Assemble the filter in the reverse sequence. When
attaching the housing cover, the dust removal valve
must point downwards.

7.0 Maintenance
T-BA/ET-1250-0-GB-10-11 19
Filter service is due
Filter ready for use
DIAGRAM 8. Combination air filter
Cleaning the filter cartridge
Cartridges can be cleaned when required. Irrespec-
tive of this, they must be replaced at the latest after 2
years.
Cleaning can consist of blowing or, alternatively knok-
king.
Cleaning by blowing
DIAGRAM 9. Blowing through the filter cartridge
Using dry compressed air at no more than 5 bar, blow
at an angle from the outside through the surface of the
cartridge towards the folds. Subsequently carefully
blow out the interior.
Cleaning by knocking
DIAGRAM 10. Knocking the filter cartridge
After cleaning, push the hook-shaped pushbutton of
the service indicator inwards (colour changes from
red to colourless). The service indicator is ready for
use once again.
Where necessary, the filter cartridge can
be cleaned once by blowing out and
knocking. It must then be replaced at the
next opportunity.
Gardner Denver accepts no liability for
damage due to failure to replace the fil-
ter cartridge on time.
7.2.5 V-belt and belt tension
The protective devices may only be
removed when the machine is at a stand-
still and the vehicle engine has been swit-
ched off.
The V-belt and belt tension must be checked every
week and retightened or replaced, where necessary.
Damaged V-belts may only be replaced with a com-
plete set of length sorted belts.
7.2.6 Clean the oil tank
The oil tank must be cleaned every 3 months. With the
machine at a standstill, drain away the lube oil. Flush
the oil tank with flushing oil.

20 T-BA/ET-1250-0-GB-10-11
7.0 Maintenance
Do not rinse the oil tank with solvent or
degreaser.
Do not forget to pre-lubricate (see „Prelubricate“ on
page 11.) before renewed use!
7.2.7 Check valve
Maintenance of the check valve is not required.
We recommend an initial inspection after 300 operat-
ing hours and then every 3 months.
Inspect the valve for oily carbon deposits and set the
date for the next inspection in accordance with the
appearance. The thickness of the oily carbon must not
exceed 1 mm.
Sealing and sliding surfaces must be free
from oily carbon deposits so as to ensure
the function of the check valve.
Where cleaning is required, the valve must be remo-
ved.
7.2.8 Vent valve
Fitment of the vent valve in an unfavourable position
may cause the bore for pressure compensation to
become blocked due to fouling which would restrict
the function of the vent valve.
To prevent this, inspect the vent valve regularly (at
least every 3 months, more frequently in the event of
considerable external fouling of the vent valve) and,
where necessary, disassemble the vent valve, remove
penetrating fouling and use compressed air so as to
clear the vent for pressure compensation.
7.2.9 Rotary slide valve rate of wear
Remove the vacuum filter, respectively intake pipe, so
as to be able to inspect the rate of wear of the rotary
slide valve.
Push the rotary slide valve into the rotary groove and
using a depth gauge measure the distance to the sur-
face of the rotor.
This dimension must not exceed 5 mm.
When the amount of wear has reached 5 mm, the
rotary slide valves must be replaced (see the separate
assembly instructions!).
The initial inspections should take place after about 6
months and should subsequently be repeated every 3
months (based on a daily operating time of 3-4 hours).