Humbaur TANDEM-PLATFORM User manual

OPERATING
MANUAL
TANDEM-BOX
TANDEM-PLATFORM
MAKES IT HAPPEN

2 Version 07/20 Operating Manual for Tandem-Platform

Operating Manual for Tandem-Platform Version 07/20 3
Contents
1 Identification 5
2 Product description 6
3 Intended use 9
4 Use contrary to the intended 9
5 General safety information 9
6 How does the brake system works? 13
6.1 Service brake 13
6.2 Handbrake 13
6.3 Spring brake-emergency release 14
7 How does the pneumatic suspension works?
( HT 10xxxx and HT 11xxxx trailers) 14
7.1 Lifting the trailer using the pneumatic suspension 15
7.2 Lowering the trailer using the pneumatic suspension 15
7.3 Setting the trailer in the driving position 15
8 How do I couple and connect the trailer to my vehicle? 16
8.1 Setting the drawbar at the coupling height of the towing vehicle ( HT up to 11,9t) 16
8.2 Extension and retraction of the jockey wheel or the supporting base 16
7.3 Coupling the trailer 16
9 How do I couple and secure the trailer? 17
10 How do I load and unload the trailer? 17
10.1 Load distribution 18
10.2 Load protection 18
10.3 Lowering/Lifting the supporting base 19
10.4 Handling the sidewalls 19
10.5 Handling the box structure 20
10.7 Unloading the trailer 20
10.8 Handling the underrun protection 21
11 How do I maintain the trailer ? 21
12 How do I service the trailer? 23
12.1 Maintenance regime 23
12.2 Axle 24
12.3 Towing ring 24
12.4 Lubrication of the drawbar 24
12.5 Lubrication of the folding legs 24
11.6 Lubrication of the supporting base 24
12.6 Maintenance of the compressed air system 25
12.7 Tightening torque 25
12.8 Tyres 26
12.10 Plug connection 27
12.11 Changing the lights 28

4 Version 07/20 Operating Manual for Tandem-Platform
13 Accessories 29
13.1 Duomatic-coupling 29
13.2 Night park warning signs 30
13.3 Spare wheel holder 31
13.4 Fire extinguisher box 33
13.5 Plastic toolbox 34
13.6 Cutainsider Structure 35
13.7 Tarp and hoop 41
14 How do I dispose of the trailer or parts of the trailer? 44
15 What should I do in the event of a malfunction? 45
16 Service and Warranty policy 47

Operating Manual for Tandem-Platform Version 07/20 5
1 Identification
Product name: Tandem Platform HT (Humbaur Tandem)
There are 12 different types of HT trailers:
Type 1
Type designation: HT 504124
Type 2
Type designation: HT 505124
Type 3
Type designation: HT 506124
Type 4
Type designation: HT 507124
Type 5
Type designation: HT 504024-20S
Type 6
Type designation: HT 505024-20S
Type 7
Type designation: HT 506024-20S
Type 8
Type designation: HT 105224
Type 9
Type designation: HT 106224
Type 10
Type designation: HT 107224
Type 11
Type designation: HT 116224
Type 12
Type designation: HT 117224
For special vehicles deviations in box dimensions are pos-
sible.
Name and address of manufacturer:
Humbaur GmbH
Mercedesring 1
Germany-86368 Gersthofen
Tel. 0049/ (0)821/24929-0
Fax [phone]
Name and address of dealer:
Name:
Address:
Telephone:

6 Version 07/20 Operating Manual for Tandem-Platform
2 Product description
The HT (Humbaur tandem) trailers are available in four different models. Three models for the tandem platform, HT
50xxxx, HT 10xxxx and HT 11xxxx. And the other model is the tandem box trailer HT 50xxxx-20S.
The tandem trailers are designed to be attached to a towing vehicle.
The trailer has anodizes aluminium sidewalls with locks. The load can be lashed in the lashing shackles that are placed
over the entire length of the trailer. The trailer with 5 tonnes allowed total weight has maintenance free due to the rubber
spring axle. The trailer has an air brake with ABS, ALB controller and spindle handbrake. The connection to the towing
vehicle is realized with and adjustable height towing device and a towing ring.
The box trailers HT 50xxxx-20S have folding doors. These can be closed using the door locking gears.
The trailers with a allowed total weight up to 11.9 tonnes have an air system brake with EBS and spring brake.
Further, the trailers are equipped with a pneumatic suspension which adjusts the driving height depending on the load.
The bridge floor is resilient to DIN EN 283. The connection to the towing vehicle is realized with and adjustable height
towing device and a towing ring, which is adjustable with a crank.
13
4
7
810
9
5
11
6
2
HT 50xxxx Tandem-platform
1 Sidewall locks
2 Side posts
3 Sidewall
4 Front wall
5 Drawbar
6 Towing ring
7 Wheel chocks
8 Fender
9 Tyres
10 Sidewall hinge
11 Jockey wheel
1
23
HT 50xxxx front wall
1 Electrical plug(15-pin)
2 Interchangeable pneumatic brake heads
3 Crank for spindle handbrake

Operating Manual for Tandem-Platform Version 07/20 7
1
4
5
67
2
3
8
HT Tandem box trailer
1 Box body
2 Drawbar
3 Towing ring
4 Door check strap
5 Wheel chock
6 Tyres
7 Fender
8 Jockey wheel
2
1
3
4
56
78
HT Tandem box trailer rear view
1 Locks of the door
2 Door hinges
3 Door locking gear
4 Loading area
5 Rear lights
6 License plate light
7 Underrun protection
8 Folding door

8 Version 07/20 Operating Manual for Tandem-Platform
1
2345
67
8
910 11 12 13 14
HT 10xxxx and HT 11xxxx Tandem-Platform up to 11,9 rear view
1 Frontwall
2 Side posts
3 Sidewall locks
4 Sidewall hinge
5 Sidewall
6 Folding underrun protection
7 Control panel for the pneumatic suspension
8 Fender
9 Tyre
10 Wheel chock
11 Case support
12 Rear lights
13 License plate light
14 Underrun protection
1
2
345
6
7
8
HT 10xxxx und 11xxxx Tandem-platform up to 11,9 tons front view
1 Loading board
2 Drawbar height adjustment
3 Crank for the supporting base
4 Drawbar
5 Towing ring
6 Wheel chock
7 Lashing shackle
8 Supporting base

Operating Manual for Tandem-Platform Version 07/20 9
3 Intended use
The next description applies for HT 50xxxx, HT 50xxxx-20S,
HT 10xxxx and HT 11xxx trailers.
The trailers are designed to be attached to a permissible
towing. They must be loaded within the permissible total
weight. Transporting dangerous goods, like chemical ma-
terials, is not allowed. A steady weight distribution must
be possible trough the load. When loading a single load
this one must have a uniform distribution. The driver is re-
sponsible for the load and their protection. The driver has
to follow the respective country specific laws for the load.
To optimise the braking efficiency, the braking tuning must
be performed after 2000 to 5000 km, and after every
change of the towing vehicle.
Trailers must be use only in a technically flawless state
4 Use contrary to the intended
The following are considered to be contrary to the inten-
ded use for all models of the Tandem HT series:
• Load with a high payload.
• Transport persons on the trailer.
• Drive with unsecured loads.
• Unapproved structural changes to the trailer.
• Exceeding the support and trailer load.
• Transporting hot materials (e.g. Tar).
5 General safety information
The safety information is valid for all HT trailers
Danger to life!
Coupling the trailer to the towing vehicle.
Engage the trailer to the towing ve-
hicle. Since the trailer doesn’t have a
handbrake and can not be controlled,
this can lead to accidents. People can
be injured or killed, objects could be
damaged.
Coupling the towing vehicle to the
trailer. Never vice versa.
Danger to life!
Coupling the trailer to the towing vehi-
cle with a position adapter.
The position adapter stands between
the towing vehicle and the trailer. He
can be run over.
Instruct the position adapter to
never stand between the towing
vehicle and the trailer.
Danger!
Danger!
Danger to life!
Couple and uncouple the air pressure
heads.
If the order is swapped, the brake
and the trailer release the brakes. The
trailer can roll. This can lead to fatal
accidents.
Be sure to connect the air pressure
heads correctly.
Danger to life!
Loading the trailer on an area with strong slope. The trailer
is perpendicular to the slope. The focus
of the load shifted out of the center.
The trailer can tip over.
Do not load the trailer perpendicu-
lar to the slope.
Danger to life!
Loading the trailer in the uncoupled
state, without lowering the supporting
base.
The supporting base at the rear of the
trailer is not folded down for loaded
and unloaded. The trailer can tilt over.
People can be injured or killed, things
could be damaged.
Fold the supporting base down to
load and unloaded in the uncouple
state.
Danger to life!
Driving with the supporting base
down.
The supporting base can tear down in
the journey and fly around uncontrolla-
bly. This can lead to accidents. People
can be injured or killed.
Make sure the supporting base is
always folded up before the jour-
ney begins.
Danger to life!
Securing the load with the lashing
shackles or the lashing rings.
The allowable strength of the lashing
shackles or the rings is exceeded. It
can not hold the load and breakdown.
This can cause accidents. People can
be injured or killed. Objects could be
damaged.
Do not exceed the allowable
strength of the lashing shackles or
rings.
Danger!
Danger!
Danger!
Danger!
Danger!

10 Version 07/20 Operating Manual for Tandem-Platform
Danger to life!
Driving with the electrical system disconnected.
The lighting at the rear does not work.
Other road users may not recognizes
when the trailer brakes. In the dark
other road users can not see the trailer.
This can lead to injuries up to death.
Check before every ride that the
electric system is connected and
the lights are working properly.
Danger to life!
Drive with the compressed air uncon-
nected.
The trailer can not brake. This can lead
to injuries up to death.
Check the connections before each
journey.
Danger to life!
Driving with unsecured loads.
The load or load parts can be thrown
outwards the trailer. People can be
injured or killed.
Secure the load in every journey.
Danger to life!
Driving with a wrong load distribution.
The axles are unevenly loaded and can
be damaged. This can lead to acci-
dents.
Distribute the load for the journey
according to the valid laws and
regulations.
Danger to life!
Drive on an extreme sloping situation.
The trailer can tip over. If the trailer is
loaded, the danger increases, becau-
se the main focus of the load moves
upwards.
Do not drive across the slope.
Danger to life!
Danger!
Danger!
Danger!
Danger!
Danger!
Danger!
Driving with unventilated air suspension bellows.
The axles are unevenly loaded and can
be damaged. This can lead to acci-
dents.
Before departure, make sure that
the air suspension bellows are
ventilated.
Danger to life!
Drive with uncouple hitch or wrong
coupled.
The hitch will opens during the journey
and the trailers will be uncoupled. The
supply lines break off and the trailer
makes a full braking. This can lead to
accidents.
Check the coupling; be sure that
the hitch is properly closed.
Danger to life!
Drive with defective tyres or with high
pressure.
The tyres burst during the ride and the
trailer starts to roll. This can lead to
accidents.
Check the tyres like the chapter of
maintenance describe.
Danger to life!
Drive at excessive speed.
The trailer can skidding and causes the
towing vehicle skid too. This could cau-
se personal injuries, death or property
damage.
Drive according the valid laws and
regulations about the speed limits
in the country.
Danger to life!
Drawbar or towing ring damaged.
The damage has to be repair, because
these components are highly loaded,
do not load in this condition because
the components could breakdown.
Replace any damaged drawbar or
towing ring for new ones. Welding
and changes in the structure are
not allowed.
Danger to life!
Danger!
Danger!
Danger!
Danger!
Danger!

Operating Manual for Tandem-Platform Version 07/20 11
Drive with dirty filter of the compressed air lines.
This may lead to failures in the braking
system and to fatal accidents.
Clean the filter according to the
maintenance instructions.
Danger to life!
Adjusting the side underrun protection.
The underrun protection is not adju-
sted or is defective. In an accident, it
doesn’t fulfil the purpose any more,
people can be injured.
Make sure the underrun protection
is mounted in the required position
and has not damage
Danger to life!
Securing the wheel chocks under the
loading area.
The wheel chocks under the loading
area are not properly secured. The
wheel chocks may become loose duri-
ng the journey and flung through the
air. This can lead to accidents. People
can be injured or killed, objects could
be damaged.
Secure the wheel chocks for every
journey.
Risk of injury!
Working in the electrical system.
The power supply was not ceased.
The person touches the wires. This can
injure the person.
Disconnect the power supply from
the towing vehicle when you are
working with the electrical system.
Risk of injury!
Climb on the drawbar.
The drawbar works under the additio-
nal load down. This can lead to the loss
of balance and to injuries.
Do not climb on the drawbar.
Risk of injury!
Danger!
Danger!
Caution!
Caution!
Slip
Danger!
Enter to the loading area with inappropriate footwear.
The loading area can be slipper with
soling or moisture. The person can be
injured.
Enter the trailer only with adequa-
te footwear.
Retighten the wheel nuts after the
first journey, the first 50 km, or af-
ter a wheel change. Check regularly
that the wheel nuts are tight.
Additional safety information for HT 50xxxx-20S:
Danger to life!!
Driving with the double folding doors
open
Load can get lost during the journey
or the immersive air flow makes the
trailer spin. This can lead to accidents.
People can be injured or killed, objects
could be damaged.
Close the double hinged doors pro-
perly for every journey.
Danger to life!
Closing the double folding doors.
The doors are not properly secured for
the journey. The vibrations during the
journey could opened the doors and
turn them independently. This may
cause accidents. People can be injured
or killed, objects could be damaged.
Close the double folding doors
properly for every journey.
Risk of injury!
Caution!
Danger!
Danger!
Achtung!

12 Version 07/20 Operating Manual for Tandem-Platform
Opening and closing the folding doors. The fingers can
be crushed between the door and the
box body when you open or close the
doors.
Take care when operates the dou-
ble doors that you do not crimp
their fingers.
Risk of injury!
Open the double doors.
When you open the double doors
people can be injured or objects can be
damaged.
Make sure that there aren’t people
or objects in the pivot area when
you open the double doors.
Risk of injury!
Open the double doors when the trai-
ler is loaded.
The double doors can jump up by the
pressure which is exerted by the load
and this can fall down.
Open the double doors carefully
when the load is against the doors.
Additional safety information for tandem platform
HT up to 11.9 ton:
Danger to life!
Driving with unplugged EBS cable
The brakes brake under full load. This
can lead to accidents, people could
injure or killed.
Check the connector before each
journey.
Danger to life!
Driving with unventilated air suspensi-
on bellows.
The axles are unevenly loaded and can
be damaged. This can lead to acci-
dents.
Before departure, make sure that
the air suspension bellows are
ventilated.
Danger to life!
Danger!
Caution!
Danger!
Danger!
Danger!
Adjust the drawbar height.
The height of the drawbar is not adju-
sted to the wheel height of the towing
vehicle. The trailer is in a tilted position.
This can lead to accidents. People can
be injured or killed, objects could be
damaged.
Adjust the drawbar height to the
towing vehicle height.
Danger to life!
Securing the crank of the drawbar and
the supporting base.
The crank is not secured for the
journey. The supporting base can fall
during the journey down. The drawbar
can rise or fall, causing tension in the
coupling. This can lead to accidents.
People can be injured or killed, objects
could be damaged.
Secure the crank and the suppor-
ting base of the drawbar for each
journey.
Material damage!
Activating the handbrake when the
brake is overheated.
The brake discs can be damaged by
the different cooling rates that occur
in the braking process. At high tempe-
ratures the disc brakes expand slightly
and press the brakes pad harder. When
the brake is released, the pads could
present irreparable damages.
Activate the handbrake when the
brake is cold.
Danger!
Caution!

Operating Manual for Tandem-Platform Version 07/20 13
6 How does the brake system
works?
You must realize a braking tuning every time you chan-
ge the towing vehicle and after 2000 to 5000 km. This
ensures that the braking powers is optimally and the brake
pad wear is minimized.
The brake has an EBS or ABS module. Faults and damages
are detected in the braking system and warning lights are
displayed in the towing vehicle.
There are two different stages.
1. The yellow warning lamp lights up.
The system has detected an error, which is not serious.
You should visit the garage when the yellow warning lamp
appears.
2. The red warning lamp lights up.
The system has discovered a serious mistake. Stop imme-
diately and let a breakdown service come. Journeys in this
state are not allowed, because the brake assembly is not
functional any more.
If the warning lamps already indicate a mistake while
starting the vehicle, drive at low speed a few metres. If the
warning lamps do not go out, visit a garage if is yellow or
stop the car in case is red.
1
23
Brake control panel for trailers with pneumatic suspension
1 Swing lever for pneumatic suspension
2 Spring brake
3 Service brake
6.1 Service brake
The service brake is automatically activated when the
supply line from the towing vehicle is disconnecting. To
solve this, you must press the black button on the control
panel. The service brake will be activated by hand, pulling
the knob.
The pressure in the system drops repeatedly by activating
and releasing the brake. If it falls below 3 bar the service
brake can not be activated.
6.2 Handbrake
Danger to life!
Releasing the handbrake.
The spring brake is released and the
trailer rolls off. This can cause injuries
and even death.
Secure the trailer with the wheel
chocks.
Spindel handbrake
1
2
Crank of the spindle handbrake
1 Safety cord of the crank
2 Crank of the spindle handbrake
The trailers HT 50xxxx und HT 50xxxx-20S are equipped
with a standard spindle handbrake. To operate this you
should take off the safety cord of the crank. Turn the
crank clockwise until the brake is tight. To release the
handbrake, turn it counter clockwise until it stops.
Insert the safety cord in the crank.
Spring cylinder
The HT 10xxxx und HT 11xxxx are equipped with a spring
parking brake. Press the spring brake when it is cooled.
You activate this by pulling the red button on the control
panel until it snaps into place.
To release it press the same button. The pressure in the
system drops repeatedly by pressing and releasing the
brake. If it falls below 5.2 bar, the spring brake can not be
activated on the control panel.
Danger!

14 Version 07/20 Operating Manual for Tandem-Platform
6.3 Spring brake-emergency release
If you need to release the sprig-loaded brake, although the
pressure in the reservoir is lower that 5.2 bar, you can do it
using the emergency release.
The HTD is equipped with four spring brakes (two in the
rear axles). You will have to release them individually.
Releasing the spring loaded brake
1
2
3
Spring loaded brake- emergency release
1 Brake cylinder
2 Protection cap
3 Threaded bolt
Danger to life!
The spring-loaded brake is activated when the trailer brake
valve is out of function.
The trailer can run over people and
also cause property damage.
The trailer brake valve needs to be
deactivated before driving with the
trailer.
Place the wheel chocks. Open the protection cap on the
spring. Rotate it to the side. Loosen the nut (wrench size
24) on the threaded bolt. Remove the bolts from the
bracket.
Opening the spring brake
Put the loose thread bolt with the profile at the end of the
opening in the spring brake. Turn the thread bolt around
approximately 90°. Put the washer and the nut on the
thread bolt and tighten them up to the case of the spring
brake.
Danger!
Screw wrench
Spring brake with screw wrench
Now using the screw wrench you can turn complete the
threaded rod from the housing and rotate it to release the
spring.
You must perform this operation on all spring brakes.
Deactivated the emergency release before the journey and
before you put the pressure on the handbrake back.
Resetting the emergency release
If the operating pressure of the trailer reaches at least 5.2
bar, you will need to unscrew the threaded bolts in all the
springs brake and remove them.
Place the threaded bolts back on the housing of the spring
brake and then secure them properly. Close the assembly
with the protection cap.
The emergency release brake is deactivated and the trailer
can be braked with the spring-loaded brake.
7 How does the pneumatic suspen-
sion works? ( HT 10xxxx and
HT 11xxxx trailers)
1
23
Brake control panel for trailers with pneumatic suspension
1 Swing lever for pneumatic suspension
2 Spring brake
3 Service brake

Operating Manual for Tandem-Platform Version 07/20 15
Danger to life!
Driving with the swing lever not placed
in the driving position.
The trailer can fling during the jour-
ney or throw parts of the trailer out.
This can lead to accidents. People can
be injured or killed, objects could be
damaged.
Place the swing lever in the “dri-
ving position” before each journey.
Danger to life!
Driving with the swing lever not placed in the driving
position.
Driving with higher air pressure can
lead to exceed the maximum allowa-
ble height. This can lead to accidents.
People can be injured or killed, objects
could be damaged.
Set the swing lever in the “driving
position” before every journey.
All Humbaur tandem Platform and trailers from the series
10xxxx Ht and 11xxxx are equipped with a pneumatic
suspension. With the pneumatic suspension, the driving
position always has the same height regardless of the
different loads. The control lever of the pneumatic suspen-
sion is located on the control panel on the left, under the
loading area. With the pneumatic suspension the lever of
the trailer can be adapted for loading and unloading.
The lift and lower valve is equipped with a security func-
tion called “stop position”
Make sure that you release the handbrake before you lift
or lower the trailer.
7.1 Lifting the trailer using the pneumatic sus-
pension
1 2
Swing lever in "Lifting" position
1 Position "Lift"
2 Position"Stop"
To lift the trailer, press the lever inwards and turn it coun-
ter- clockwise on the symbol “lift”. The trailer is lifting.
Danger!
Danger!
If the desired height is reached, turn the lever to the
“stop” position. The trailer will remain in that position.
7.2 Lowering the trailer using the pneumatic
suspension
1
2
Swing lever in "stop" position
1 Position "Stop"
2 Position"Lower"
To lower the trailer, press the lever inward and turn it
clockwise on the symbol “lower”. The trailer starts to
lower. If the desired height is reached, turn the lever to the
“stop” position. The trailer will remain in that position.
7.3 Setting the trailer in the driving position
1
2
Swing lever in driving position
1 Driving position
2 Swing lever
If the swing lever stands in the driving position, this is pul-
led out and can not be swung. In this position the trailer
can be driven.
Set the swing lever in the driving position before every
journey.

16 Version 07/20 Operating Manual for Tandem-Platform
8 How do I couple and connect the
trailer to my vehicle?
8.1 Setting the drawbar at the coupling height
of the towing vehicle ( HT up to 11,9t)
1
2
3
Drawbar height adjustment
1 Crank to adjust the elevation
2 Crank locking device
3 Drawbar
Release the crank locking device. Turn the crank to adjust
the drawbar to the towing vehicle height. Insert the crank
locking device again when you set up the drawbar to the
desired height.
Do not change the connections of the height adjustment.
8.2 Extension and retraction of the jockey
wheel or the supporting base
Danger to life!
Driving with supporting base or jockey wheel incorrectly
raised or wound up.
The supporting base or jockey wheel
can be torn down and thrown away.
People can be injured or killed, objects
can be damaged.
Make sure the supporting base or
the jockey wheel is fully retracted
for the journey.
Danger!
Jockey wheel
Jockey wheel
Pay attention to the crank lever, always ensure that the
jockey wheel does not block the brake rod when is folding
up. Wind the jockey wheel always completely up until is
fully retracted.
Supporting base
1
2
3
Supporting base
1 Crank
2 Locking device
3 Supporting base
To extent the supporting base, release the crank locking
device. Wind the supporting base down.
To retract the supporting base to the driving position, wind
it using the crank upwards. Insert the crank locking device.
7.3 Coupling the trailer
Drive your towing vehicle to the trailer so the towing ring
engages in the hitch of the vehicle. Pull the handbrake in
the towing vehicle. Check the trailer is correctly coupled.
Now connect the terminals of the trailer to the towing
vehicle. Make sure to connect in the right order.

Operating Manual for Tandem-Platform Version 07/20 17
1 First, plug the power supply and the ABS or EBS
connector of the trailer to your vehicle. Secure it by
putting down the locking bracket.
2 Clean the sealing surfaces and sealing rings of the
coupling heads of the compressed air with a clean
cloth. Clean it in the towing vehicle as well as in the
tractor.
3 Couple the compressed air line for the control system
(yellow).
4 Couple the compressed air line for the supply (red).
Check the connection between the trailer and the towing
vehicle are properly connected and tight.
Take the chocks away under the tyre. Plug these into the
designated holder under the loading area. Release the
spring brake in the HT 10xxxx and HT 11xxxx trailers. Do
this by pressing the red button on the control panel.
Before every journey, check:
• The wheel chocks are secured.
• The connections for the electrical system and air
pressure are properly connected.
• The lighting system is working.
• The air suspension bellow is not damaged.
• The brake system is working.
• The trailer is properly coupled.
• The spring bars of the supporting base are closed at
the rear.
• The supporting base is folded up.
• The spring brake is released.
• The load is fastened properly.
• The overall weight, the nose weight and the axle
loads are observed.
• The underrun protection is correctly installed and
there is not damaged.
9 How do I couple and secure the
trailer?
When you remove the air pressure lines the service brake
of the trailer is automatically activate. Follow the sequence
of your connections to distinguish.
1 Disconnect the compressed air hose for the supply
(red) from the towing vehicle.
2 Disconnect the compressed air hose for the controller
system (yellow) from the towing vehicle.
Button
Pneumatic holder
Fasten the pneumatic holder on the drawbar. To do this,
put the coupling head with the hole on the button. Turn
the coupling head counter clockwise until it stops. Unplug
the connector for ABS or EBS and the electrical system.
Plug these into the pneumatic hold on the drawbar.
Material damage!
Activating the handbrake when the brake is overheated.
The brake discs can be damaged by
the different cooling rates that occur
in the braking process. At high tempe-
ratures the disc brakes expand slightly
and press the brakes pad harder. When
the brake is released, the pads could
present irreparable damages.
Activate the handbrake when the
brake is cold.
Activate the spindle handbrake in the HT 50xxxx and HT
50xxxx-20S trailers.
In the trailers with spring brake, you should following the
next step. Pull the red button on the brake control panel.
Place the wheel chocks under the tyres. Uncouple the
trailer. Drive the towing vehicle away.
10 How do I load and unload the trai-
ler?
Fold down the supporting base for loading and unloading
the trailer in the uncoupled state.
Danger to life!
Loading and loading the trailer.
The supporting base at the rear is not
folded down. The rear axle or the fra-
me can be damaged.
Always support the trailer for loa-
ding and unloading.
Danger to life!
Loading and unloading of the trailer.
The trailer is on loose ground for loa-
ding or unloading. The supporting base
and the folding legs sink. Thus, the rear
or the front is no longer supported.
Thus the rear or front axle or the frame
can be damaged.
Load and unload the trailer on a
solid surface.
Risk of injury
Caution!
Danger!
Danger!
Slip
danger!

18 Version 07/20 Operating Manual for Tandem-Platform
Enter to the loading area with inappropriate footwear.
The loading area can be slipper with
soling or moisture. The person can be
injured.
Enter the trailer only with adequa-
te footwear.
Risk of injury
Entering and leaving the loading
area.
One can easily stumble at the ente-
ring or leaving area, because the loa-
ding zone doesn’t offer support to
climb at this area. Wrong footwear
makes easier to stumble. The person
can be injured.
Enter the trailer only with the
adequate footwear. Always enter
carefully, never hastily.
10.1 Load distribution
Danger to life!
Driving with a wrong load distribution.
The trailer can skidding, this could cau-
se personal injuries, death or property
damage.
Distribute the load for the journey
according to the valid laws and
regulations.
Distribute the load evenly and centered on the loading
area of the trailer.
You must obey the valid laws of the country in where you
are transporting the load. Also you must follow all the
applicable laws regarding the load protection.
Danger!
Sturdy
shoes
Danger!
10.2 Load protection
Danger to life!
Driving with unsecured loads.
The load or load parts can be thrown
outwards the trailer. People can be
injured or killed.
Secure the load in every journey
The load must be properly secured. You must check this
before and during the journey. Depending on the model,
the load can be fastened to different points.
HT 50xxxx, HT 10xxxx and HT 11xxxx
Lashing shackle
The HT 50xxxx, HT 10xxxx und HT 11xxxx trailers have
integrated in both sides of the loading area a V-lashing
rod. The number of lashing shackles depends of the length
of the trailer. If you don not use the lashing shackles, they
will lie completely in the V-lashing rod.
Notice the maximum allowed load of the lashing brackets.
The lashing shackle may be loaded up to 2000 daN. The
lashing angle must be at least 30° to the loading floor.
In addition, you must follow the valid rules for the load
protection. Also you must obey any other law regarding
the load property.
HT 50xxxx-20S (accessories)
Lashing point
The 50xxxx HT-20S trailers have lashing points integrated
in the loading area. The number of lashing points will
depend on the length of the trailer. They are suitable for a
tensile load of 400 daN / kg.
Danger!

Operating Manual for Tandem-Platform Version 07/20 19
10.3 Lowering/Lifting the supporting base
Use for your own security gloves when you operate the
supporting base and the sidewalls.
Loading and unloading the trailer on a solid surface.
A second supporting base is available as an accessory for
the right side of the trailer.
12
4
3
Supporting base in driving position
1 Bottom supporting base
2 Fastener bolt
3 Top supporting base
4 Lever
Supporting base in support position
Open the lever of the supporting base in the rear, until
the supporting base folds down independently. Release
the lever. If the supporting is in the correct position, the
lever locks independently. Remove the safety pin from the
fastener bolt. Pull the fastener bolt from the lower part of
the supporting base. Place the supporting base slowly on a
solid surface.
Insert the fastener bolt in the round holes of the suppor-
ting base and secure it with the safety pin. If this is not
possible, raise the lower part so far that you can insert the
fastener bolt.
10.4 Handling the sidewalls
Risk of injury!
Opening and closing the folding doors.
The fingers can be crushed between
the door and the side posts when you
open the lever.
Take care when operates the side-
walls that you do not crimp their
fingers.
Risk of injury!
Open the sidewalls when the trailer is loaded.
The sidewalls can jump up by the pres-
sure which is exerted by the load and
this can fall down.
Open the sidewalls carefully when
the load is against them.
Opening and closing the sidewalls
Hold the sidewall when opening down to avoid that
this jumps up. Open the sidewall locks. Fold the sidewall
down.
To close the sidewalls you must fold the sidewalls up and
close the locks.
In the HT 10xxxx and HT 11xxxx trailers the rear wall has a
folding step.
Folding step at the rear wall
To fold the step down, pull it up and then fold it away
the sidewall. Close the folding step before you fold the
sidewalls up in the driving position. To close the step, fold
it upwards and press it against the fixture down.
3
2
1
Sidewall hinge
Caution!
Caution!

20 Version 07/20 Operating Manual for Tandem-Platform
1 Hinge
2 Safety pin (only front and rear walls)
3 Sidewall
To remove the sidewall hinge, remove the safety pin from
the hinge (each sidewall hinge on the right outside). Open
all levers of the sidewalls to be removed. Hold the sidewall
at 90 ° angle to the position of the closed wall. Unhook
the sidewall.
If you have removed all sidewalls, remove the corner posts.
The assembly occurs in reverse order. Besides, is to be
noted that you must use a new protection pin if this is
defective.
10.5 Handling the box structure
Opening and closing the double folding doors
123
Door locking gear
1 Safety lock
2 Pressure relief device
3 Handle
Hold the double folding doors while opening firmly to
prevent that these jump up. Open the door locking gear.
Unlock in addition the lock of the door locking gear. Press
the pressure relief device and raise the handle, until this
stands in 90° angle to the double doors. Open the double
door and bring the handle back in his original position.
Secure the open doors using the door clamps.
To close the double doors you have to close first the left
one and then the right door. Close the door locking gear.
Make sure that the locking and the pressure relief devices
engage correctly. Close the door locking gear for every
journey.
10.6 Loading the trailer
Risk of injury
Slip
Danger!
Enter to the loading area with inappropriate footwear.
The loading area can be slipper with
soling or moisture. The person can be
injured.
Enter the trailer only with adequa-
te footwear.
Risk of injury
Entering and leaving the loading area.
One can easily stumble at the entering
or leaving area, because the loading
zone doesn’t offer support to climb
at this area. Wrong footwear makes
easier to stumble. The person can be
injured
Enter the trailer only with the
adequate footwear. Always enter
carefully, never hastily.
Provide the correct load distribution and protection accor-
ding to the valid regulations of the load protection. Follow
the allowed gross weight of the trailer.
On the loading area
Load the trailer in such way that the load does not affect
the front wheel area. With non observance of the load,
it can damage the towing vehicle while driving. Provide
the correct load distribution and protection according to
the valid regulations of the load protection. Follow the
allowed gross weight of the trailer.
Loading gravel
Check the sidewalls are closed before you load the trailer
with gravel. Now you can top up the load. Provide a cor-
rect charge distribution and load protection according to
the valid regulation on the load protection.
10.7 Unloading the trailer
Risk of injury!
Caution!
sturdy
shoes
Slip
Danger!