MAHA DUO GN Series User manual

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DUO GN
Scissors Lift
Original Operating Instructions
BA081101-en

II BA081101-en
© MAHA Maschinenbau Haldenwang GmbH & Co. KG
Legal notice based on ISO 16016:
The reproduction, distribution and utilization of this document as well as the communication of
its contents to others without explicit authorization is prohibited. Offenders will be held liable for
the payment of damages. All rights reserved in the event of the grant of a patent, utility model or
design.
The contents of this edition have been checked with great care. However, errors cannot be fully
excluded. Subject to technical change without notice.
Document
Document №: BA081101-en
Approval Date: 20.10.2011
Manufacturer
MAHA Maschinenbau Haldenwang GmbH & Co. KG
Hoyen 20
87490 Haldenwang
Germany
Phone: [phone]
Fax: [phone]
Fax Parts: [phone]
Internet: http://www.maha.de
E-Mail: [email protected]
Hotline: [phone] for Brake Testers and Test Lanes
[phone] for Automotive Lifts
[phone] for Dynamometers and Emission Testers
Service
AutomoTec GmbH
Maybachstraße 8
87437 Kempten
Germany
Phone: [phone]
Fax: [phone]
Internet: http://www.automo-tec.com
E-Mail: [e-mail]

BA081101-en III
CONTENTS
1Safety .........................................................................................................................1
1.1Introduction ....................................................................................................................................1
1.2Safety Instructions for Commissioning...........................................................................................1
1.3Safety Instructions for Operation ...................................................................................................1
1.4Safety Instructions for Servicing ....................................................................................................2
1.5Further Information.........................................................................................................................2
1.6Safety Features..............................................................................................................................3
1.6.1Controls...........................................................................................................................3
1.6.2Roll-off Protection ...........................................................................................................3 
1.6.3Light Barriers ..................................................................................................................3
1.6.4Protection Bars ...............................................................................................................3 
1.6.5Pressure Relief Valve .....................................................................................................3
1.6.6Seat Valves.....................................................................................................................3
1.6.7Safety Latch....................................................................................................................3
2General Information ..................................................................................................5
2.1Description .....................................................................................................................................5
2.2Intended Use..................................................................................................................................5
2.3Standard Delivery...........................................................................................................................5
2.4Noise Emission ..............................................................................................................................5
2.5Specifications .................................................................................................................................6
2.6Sample Nameplate.........................................................................................................................8
2.7Installation ......................................................................................................................................8
2.7.1Location ..........................................................................................................................8
2.7.2Foundation......................................................................................................................8
2.7.3Power and Air Supply .....................................................................................................9
3Operation .................................................................................................................11
3.1Defects / Malfunctions..................................................................................................................11
3.2Controls........................................................................................................................................12
3.2.1Operator's Controls.......................................................................................................12
3.2.2Main Switch ..................................................................................................................13
3.3Operating the Lift..........................................................................................................................14
3.3.1Switch-on / Switch-off ...................................................................................................14
3.3.2Protection against Unauthorized Usage.......................................................................14
3.3.3Raising..........................................................................................................................15
3.3.4Working with the Vehicle in Raised Position ................................................................15
3.3.5Lighting .........................................................................................................................15
3.3.6Lowering .......................................................................................................................16
3.3.7Hydraulic Inclination......................................................................................................17
3.3.8Setting the Runways on Locks for Wheel Alignment....................................................17
3.4Automatic Runway Synchronization ............................................................................................18
3.4.1Lift without Inclination Device .......................................................................................18
3.4.2Lift with Hydraulic Inclination Device ............................................................................18
3.4.3Lift with Permanent Inclination Device..........................................................................19
3.5Cross Member..............................................................................................................................20
3.6Manual Lowering..........................................................................................................................21
3.7Manual Lowering (Lift with Center Cover)....................................................................................22
3.8Operation of Wheel-Free Jack .....................................................................................................23
3.8.1Preparations .................................................................................................................23
3.8.2Raising..........................................................................................................................23
3.8.3Lowering .......................................................................................................................23
3.8.4Manual Lowering ..........................................................................................................24
3.8.5Manual Equalization .....................................................................................................25

IV BA081101-en
4Maintenance.............................................................................................................27
4.1Annual Inspection.........................................................................................................................27
4.2Checking the Fluid Level..............................................................................................................27
4.3Greasing Points............................................................................................................................28
4.4Greasing Points at the Wheel-Free Jack .....................................................................................29
4.5Pneumatic Floor Cover ................................................................................................................30
4.6Cleaning .......................................................................................................................................30
4.7Troubleshooting ...........................................................................................................................30
5Life Expectancy.......................................................................................................32
6Dismantling..............................................................................................................32
7Disposal ...................................................................................................................32
8Contents of the Declaration of Conformity...........................................................32

BA081101-en 1
1 Safety
1.1 Introduction
Thoroughly read this manual before operating the lift and comply with the instructions. Always
display the manual in a conspicuous location.
Personal injury and property damage incurred due to non-compliance with these safety
instructions are not covered by the product liability regulations.
Warning: Failure to comply with instructions could result in personal injury.
Caution: Failure to comply with instructions could result in property damage.
Important information.
Carefully observe all safety instructions. They are provided to warn of dangers and help prevent
personal injury and property damage.
It is the operator’s responsibility to comply with the applicable accident prevention regulations
and to bring them up to date continually.
1.2 Safety Instructions for Commissioning
Installation and commissioning by authorized service personnel only.
The standard lift version may not be installed and commissioned in the vicinity of explosives
or flammable liquids. Lifts with explosion protection are available on request.
1.3 Safety Instructions for Operation
Read the operating manual.
Only use the lift for its intended purpose.
Do not overload the lift. The rated load capacity is indicated on the lift nameplate.
Lift operation by trained personnel over 18 years only.
Keep the lift area free of obstructions.
Closely watch the vehicle and the lift during raising and lowering cycles.
Do not allow anyone to stay in lift area during raising and lowering cycles.
Do not allow anyone to climb on lift or raised vehicle.
Secure the vehicle against inadvertent roll-off by using chocks.
Keep the lift and vehicle free of tools, parts etc.
Keep the lift and lift area clean.
The main switch serves as emergency switch. In case of emergency turn to position 0.

2 BA081101-en
Protect the lift against unauthorized usage by padlocking the main switch.
Provide adequate ventilation when working on operating internal combustion engines.
Danger of carbon-monoxide poisoning!
1.4 Safety Instructions for Servicing
Maintenance or repair work by authorized service personnel only.
Turn off and padlock the main switch before servicing the lift.
Work on pulse generators or proximity switches by authorized service personnel only.
Work on the electrical equipment by certified electricians only.
Ensure that ecologically harmful substances are disposed of only in accordance with the
appropiate regulations.
1.5 Further Information
Take precautions against soil contamination by hydraulic fluid.
Position the control panel in such a way that the main switch is easily accessible at all times.
For low shop ceilings the installation of a safety light barrier is recommended.
Protect the plunger rods against soiling and damage.
Drive on runways only in their fully retracted position.
The use of high pressure or steam jet cleaners could result in equipment damage.
The use of cleansing agents which attack paintwork, coatings, or sealing materials could
result in equipment damage.

BA081101-en 3
1.6 Safety Features
1.6.1 Controls
1.6.1.1 Dead Man's Type Control
The operator is required to hold the control in the engaged position to initiate and maintain a
particular operation.
1.6.1.2 Front Rings
The control buttons are provided with front rings to prevent inadvertent actuation.
1.6.2 Roll-off Protection
Once the runways are raised, the approach ramps rise and act as chocks.
1.6.3 Light Barriers
1.6.3.1 Longitudinal Light Barriers (Pinch Point Protection)
The outside edges of the runways are equipped with light barriers. Once the light beam is
interrupted the lift stops immediately.
1.6.3.2 Transverse Light Barrier (Runway Synchronization Check)
This light barrier is used to check the runway synchronization. Once a certain level difference is
exceeded the lift stops immediately.
1.6.4 Protection Bars
The surface mounted version is equipped with longitudinal protection bars.
1.6.5 Pressure Relief Valve
The working pressure is limited to a maximum of 260 bar by the pressure relief valve.
1.6.6 Seat Valves
Positive-control seat valves at the hydraulic cylinders prevent sudden lowering movements in
case of a rapid pressure drop due to line break.
1.6.7 Safety Latch
The safety latch prevents sudden lowering movements caused by pressure drop or cylinder
leakage.

4 BA081101-en

BA081101-en 5
2 General Information
2.1 Description
The DUO-GN is a scissors lift equipped with runways. In its standard version, the lift has a
maximum lifting height of 2075 mm.
2.2 Intended Use
The lift is intended to be used for the safe lifting of automotive vehicles. Be sure to observe the
rated load capacity and load distribution.
Lift Version Load Capacity
DUO-GN 4,200 kg
2.3 Standard Delivery
Scissors lift, model DUO-GN
Control desk including power unit
Cable covers
Two approach ramps (for surface mounted version) or four flaps (for flush mounted version)
Two pneumatic quick couplers at runway inside
Operating manual
2.4 Noise Emission
The sound pressure level is below 70 dB(A) in the working area of the operator.

6 BA081101-en
2.5 Specifications
DUO-GN
2.5 kW
(Standard)
DUO-GN
5.5 kW
(Option)
DUO-GN
2 x 5.5 kW
(Option)
Rated load capacity 4200 kg 4200 kg 4200 kg
Full travel 1850 mm 1850 mm 1850 mm
Lifting height max. 2075 mm 2075 mm 2075 mm
Lifting height max. with
compensating plates 2125 mm 2125 mm 2125 mm
Lifting height min. 225 mm 225 mm 225 mm
Lifting height min. with
compensating plates 275 mm 275 mm 275 mm
Dimensions of
standard version
L x W x H
4000 mm x 2075 mm
x 225 mm
L x W x H
4000 mm x 2075 mm
x 225 mm
L x W x H
4000 mm x 2075 mm
x 225 mm
Raising time approx. 45 s approx. 25 s approx. 12 s
Lowering time approx. 45 s approx. 25 s approx. 12 s
Anchoring with MKT
heavy-duty anchors
12x SZ-B 15/45
or
12x SZ-B 15/95
12x SZ-B 15/45
or
12x SZ-B 15/95
12x SZ-B 15/45
or
12x SZ-B 15/95
Anchoring with Fischer
heavy-duty anchors
12x FH 15/50 B
or
12x FH 15/100 B
12x FH 15/50 B
or
12x FH 15/100 B
12x FH 15/50 B
or
12x FH 15/100 B
Anchoring with UPAT
heavy-duty anchors
12x PS-B 15/50
or
12x PS-B 15/100
12x PS-B 15/50
or
12x PS-B 15/100
12x PS-B 15/50
or
12x PS-B 15/100
Motor power 2.5 kW 5.5 kW 2 x 5.5 kW
Supply voltage 3~ 400 V, 50 Hz 3~ 400 V, 50 Hz 3~ 400 V, 50 Hz
Wire size min. 2.5 mm² 4 mm² 6 mm²
Rated current 6.2 A 12 A 24 A
Fuse protection 16 A 25 A 35 A
Reservoir capacity approx. 38 l approx. 38 l approx. 38 l
Petroleum-based fluid
specification HLPD 32 min. HLPD 32 min. HLPD 32 min.
Biodegradable fluid
specification MAHA HLP 32 MAHA HLP 32 MAHA HLP 32
Working pressure max. 260 bar 260 bar 260 bar
Pump capacity 3.1 cm3/U 6 cm3/U 2 x 6 cm3/U
Specifications are subject to change without notice.

BA081101-en 7
Overview of DUO GN Lift (with Wheel-Free Jack)

8 BA081101-en
2.6 Sample Nameplate
Lifts of this model series have one large and one small nameplate each at the control desk and
at the hydraulic power unit. In the event of customer complaints, hotline requests or spare parts
orders, serial number and YoM of the lift should always be indicated.
SCHERENHEBEBÜHNE
Seriennummer / Baujahr: ***
Projekt: ***
Typ und Ausführung: ***
Spannung: ***
Frequenz: ***
Nennstrom: ***
Absicherung: ***
Traglast: ***
2.7 Installation
Lift installation and commissioning by authorized service personnel only.
Provision of handling means such as forklifts etc. is the owner's responsibility.
2.7.1 Location
The standard lift version may not be installed outdoors, in moist rooms, at hazardous locations,
or in the vicinity of explosives or flammable liquids.
Choice of a suitable lift location is the owner's responsibility.
2.7.2 Foundation
Prior to installation a sufficiently stable foundation and level lift bay floor shall be completed in
accordance with manufacturer recommendations.
Lift Version Minimum Concrete
Thickness
DUO-GN 140 mm (reinforced)
Always use the current foundation plans.
Proof of safe floor load capacity is the owner's responsibility.

BA081101-en 9
2.7.3 Power and Air Supply
Power supply cable and air hose should be run to the control desk location with an excess
length of at least 1.5 m.
2.7.3.1 Power Supply
3~ + N + PE 400 V, 50 Hz. Select a wire size appropriate for lift model and cable length.
Motor power in kW Time-delay fuse in A Rated current in A
Standard 2.5 16 6.2
Option 5.5 25 12
Option 2 x 5.5 35 24
2.7.3.2 Air Supply
R1/4" incl. maintenance unit; delivery rate and working pressure appropriate for lift model.

10 BA081101-en

BA081101-en 11
3 Operation
Lift operation by trained personnel over 18 years only.
Apply the parking brake after positioning the vehicle on the lift.
Do not allow anyone to stay in lift area during raising and lowering cycles.
Closely watch the vehicle and the lift during raising and lowering cycles.
Observe the rated load capacity.
Do not allow anyone to climb on lift or raised vehicle.
Drive onto runways only in their fully lowered position.
The DUO-GN lift can be equipped with various accessories. In some cases your lift version may
differ slightly from the illustrations in this manual.
3.1 Defects / Malfunctions
In case of defects or malfunctions such as jerky lift movement or deformation of the
superstructure, support or lower the lift immediately.
Turn off and padlock the main switch. Contact qualified service personnel.

12 BA081101-en
3.2 Controls
3.2.1 Operator's Controls
Description Symbol
Power (white signal lamp)
Lights up once lift is ready for operation.
Error (red signal lamp)
Lights up or flashes in the event of errors such as light barrier interruptions.
Axle Jack Position (orange signal lamp) [optional]
Only available with option "Floor Cover with Defined Axle Jack Position".
Lights up once axle jack is moved from its defined home position.
The lift can only be lowered to bottom position with axle jack in defined home
position.
Raise (button)
Press and hold this button to raise the lift. Lift stops once button is released
or upward travel limit is reached.
Lift stops if transverse light barrier (synchronization check) is interrupted.
Lift is inoperative until obstacle/error has been removed.
Lower (button)
Press and hold this button to lower the lift. Lift stops once button is released
or downward travel limit is reached.
For lifts equipped with Set-on-Locks function: Lift slightly raises to disengage
the locking latches before lowering cycle starts.
Lift stops if one of the longitudinal light barriers or the transverse light barrier
is interrupted. Lift is inoperative until obstacle/error has been removed.
Lighting (switch) [optional]
Use this switch to turn on and off the runway lighting.
Set on Locks (button/green signal lamp) [optional]
Locking latch engages nearest serration.
The signal lamp will not light up until the main cylinders (and the inclination
cylinders) are depressurized.
Enable Runway Inclination (button) [optional]
Use this button to activate the hydraulic runway inclination for vehicles with
low ground clearance.
Disable Runway Inclination (button) [optional]
Use this button to reset the runways to their horizontal position.

BA081101-en 13
Raise Wheel-Free Jack (button) [optional]
Use this button to raise the wheel-free jack.
Lower Wheel-Free Jack (button) [optional]
Use this button to lower the wheel-free jack.
The availability of the above functions depends on the accessory equipment of your lift.
See operating manuals provided.
3.2.2 Main Switch
Position 1: Lift is ready for operation.
Position 0: Lift is disconnected from power supply. In this position
the main switch can be padlocked.
In case of emergency turn the main switch to position 0.

14 BA081101-en
3.3 Operating the Lift
3.3.1 Switch-on / Switch-off
In case of emergency turn the main switch to position 0.
ON: Turn main switch to position 1.
The POWER signal lamp lights up
once the lift is ready for operation.
OFF: Turn main switch to position 0.
The POWER signal lamp
extinguishes.

After switch-on wait approx. 3 seconds until the control electronics have performed a self-test.
3.3.2 Protection against Unauthorized Usage
With main switch in position 0 push yellow
slider and padlock the switch.

BA081101-en 15
3.3.3 Raising
Closely watch the vehicle and the lift during raising and lowering cycles.
Do not allow anyone to stay in lift area.
Be sure lift is in bottom position.
Slowly center vehicle on runways.
Secure vehicle using parking brake and chocks.
Leave vehicle and stay clear of lift area.
Press and hold RAISE button until lift has reached desired height.
Lift stops once button is released or upward travel stop is reached.
3.3.4 Working with the Vehicle in Raised Position
Observe all accident prevention regulations.
Do not allow anyone to stay under the vehicle.
Avoid excessive rocking of vehicle or lift.
Keep lift and vehicle free of tools, parts, debris etc.
3.3.5 Lighting
Runway lighting (optional).
Lighting OFF Lighting ON

16 BA081101-en
3.3.6 Lowering
Closely watch the vehicle and the lift during raising and lowering cycles.
Do not allow anyone to stay in lift area.
Press and hold LOWER button until lift has reached desired height.
Before starting the lowering cycle the lift will slightly raise to disengage the
locking latch.
Lift stops once button is released or downward travel stop is reached.
Make sure lift is fully lowered before removing the vehicle.
Release parking brake, remove chocks.
Drive vehicle off the lift.
If the lift is equipped with option "Set on Locks for Wheel Alignment", press and
hold the LOWER button until the green signal lamp SET ON LOCKS lights up.
This is to ensure troublefree operation of the automatic runway synchronization.
If equipped with option "Pinch Point Protection with Audible Warning Device“, the lift will pause
short of downward travel stop.
Release LOWER button and press again. A signal sounds until the lift is in bottom position.
If the lift is equipped with option "Floor Cover for Defined Axle Jack Position", the
lift can only be lowered to bottom position if the axle jack is in defined home
position.
Once the axle jack is in defined home position, the signal lamp AXLE JACK
POSITION goes out.