Humbaur HA Series, HA 253015, HN Series, HN 202616, HN 203118 Operating Instructions Manual

Tandem trailers

Operating
Instructions

Part 2 - HA - HN - HT

MACHT’S MÖGLICH

en

2000 series

Name and address of manufacturer:

Name and address of dealer:

Humbaur GmbH
Mercedesring 1
86368 Gersthofen
Germany

Tel. [phone]
Fax [phone]

[e-mail]
www.humbaur.com

Name:

Address:

Telephone:

►► 

►► Please enter the name of your dealer.

Notes on use/target group

PART 2 - Original - “Tandem Trailer” Operating Instruction Manual

This “Tandem Trailer” Operating Instruction Manual Part 2 is intended for you as the user of a ready-to-use trailer.
It provides detailed instructions for handling tandem trailers.
It contains all the relevant details on safe operation, care/cleaning, maintenance/servicing, troubleshooting and decommissioning/disposal.
This specific operating instruction manual (Part 2) for your trailer is provided on the enclosed CD. You can also download it from

www.humbaur.com in the section: Download – Operating Instructions.

PART 1 – “Trailers up to 3.5 to General Points”

For all other general information on trailers up to 3.5 to, see the operating instruction manual, “Trailers up to 3.5 to (General Points – Part 1).”

• PART 1 and PART 2 together form the complete documentation for your trailer, which you, as the user, should have at your disposal.

Read this operating instruction manual carefully and completely before using your trailer for the first time and observe all of the
instructions, safety information and warnings. Comply with the steps for handling.

• Non-observance of any of the documentation can cause injuries to you and to other persons and can cause material damage.

• Non-observance may invalidate your warranty entitlement.

• Keep this operating instruction manual in a safe place for the entire service life of your trailer.

• We advise you to store the operating instruction manual in the driver's cab and to keep it on hand for reference.

• It should be passed on to the new user/owner if you rent out or sell your trailer.

Furthermore, as a road user, you are obliged to observe all national regulations for driving a vehicle with trailer and to comply
with your obligations as the owner of a commercial vehicle.

• This includes carrying out regular service and maintenance and periodically subjecting your trailer to a full technical inspection.

• Observe any special stipulations that are specific to your country.

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Index

1 Identification 4

1.1 Confirmation of compliance 4

2 Product description 5

2.1 Components 5

2.2 Flatbed trailers aluminium HA 6

2.3 Aluminium HN and HT wheels-in trailer 6

2.4 Special versions 7

2.5 Optional accessories 8

3 Intended use 9

3.1 HA 9

3.2 HN / HT 9

4 Foreseeable misuse 9

4.1 HA 9

4.2 HN / HT 9

5 General safety instructions 9

6 Loading and unloading 10

6.1 Load distribution 10

6.2 Load securing 11

6.3 Drop sides 14

6.4 Side wall extension (optional) 18

6.5 Two-part drop side (optional) 19

6.6 Raised drop side (optional) 20

6.7 Steel mesh extension – HA (optional) 20

6.8 Supports (optional) 21

6.9 Wood/aluminium cover (optional) 22

6.10 Flat cover (optional) 25

6.11 Tarpaulin cover (optional) 25

6.12 Ramp wall – HN/HT (optional) 29

6.13 H-frame (optional) 31

6.14 Drive-up ramp – HN / HT (optional) 32

6.15 Cable winch (optional) 35

6.16 Grid ramp wall – HA (optional) 38

6.17 Toolbox (optional) 41

9 Cleaning/maintenance/servicing 43

9.1 Care/cleaning 43

9.2 Maintenance/servicing 43

10 Troubleshooting 45

11 Decommissioning/disposal 45

11.1 Shutdown 45

11.2 Disposal 45

7 Driving 42

8 Parking 42

8.1 Parking an uncoupled trailer 42

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1 Identification

►► Put a cross next to the type of trailer you have

acquired.

►► Read the general operating instruction manual

for car trailers (PART 1).

Product name: Tandem trailers

1.1 Confirmation of compliance

Humbaur GmbH hereby confirms compliance

with all relevant EU directives for the registra­tion and safe use of trailers of the 2000 series tandem trailers
with accessories.
You may request a detailed EU declaration of conformity from us
separately.

2000 Series:

HA flatbed trailer

Type 1: HA 202513 o
Type 2: HA 203015 o
Type 3: HA 253015 o

HN wheels-in trailer

Type 1: HN 202616 o
Type 2: HN 203116 o
Type 3: HN 203118 o
Type 4: HN 253118 o
Type 5: HN 303118 o
Type 6: HN 203121 o
Type 7: HN 253121 o
Type 8: HN 303121 o
Type 9: HN 204118 o
Type 10: HN 254118 o
Type 11: HN 304118 o
Type 12: HN 204121 o
Type 13: HN 254121 o
Type 14: HN 304121 o
Type 15: HN 255121 o
Type 16: HN 305121 o

HT wheels-in trailer

Type 1: HT 202616 o
Type 2: HT 203116 o
Type 3: HT 203118 o
Type 4: HT 253118 o
Type 5: HT 303118 o
Type 6: HT 353118 o
Type 7: HT 203121 o
Type 8: HT 253121 o
Type 9: HT 303121 o
Type 10: HT 353121 o
Type 11: HT 204118 o
Type 12: HT 254118 o
Type 13: HT 304118 o
Type 14: HT 354118 o
Type 15: HT 204121 o
Type 16: HT 254121 o
Type 17: HT 304121 o
Type 18: HT 354121 o
Type 19: HT 255121 o
Type 20: HT 305121 o
Type 21: HT 355121 o
Type 22: HT 255124 o
Type 23: HT 305124 o
Type 24: HT 355124 o
Type 25: HT 256121 o
Type 26: HT 306121 o
Type 27: HT 356121 o
Type 28: HT 256124 o
Type 29: HT 306124 o
Type 30: HT 356124 o

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2 Product description

4

2.1 Components

Illustrated examples

HA

1

2

3

5

6 7 8

11 12 13

10

9

14 15

16

17

HT HN

14

15

16

Front view

HA

18

1. Cargo bed

2. Covered lock

3. Hand brake lever

4. Ball coupling

5. Safety cable

6. Drawbar support

7. Parking socket electric systems /
plug holder

8. Jockey wheel

9. V drawbar

10. Drop side hinge (HA)

11. Front drop side

12. Front reflector /
side light

13. Wheel chock

14. Mudguard

15. Wheel/tyre

16. Spray flap

17. Side reflector / yellow reflector

18. Side drop side

19. Tie-down point

20. V lashing rails

21. Tail light, combined with trian­gular reflector, indicator, brake
light, rear fog light, optional
reversing light, position lamp

22. Number plate light

23. Rear drop side

24. Underride protection

25. Stanchion

26. Drop side hinge (HN/HT)

27. Ramp slot

28. Rear reflector / red reflector

HT

19

20 22231021

Accessories/extensions are
separately explained in the
partial description below
or in the operating
instruction manual
“Trailers up to 3.5 to
General Points – Part 1.”

24

25

Rear view

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26 27

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2824

2.2 Flatbed trailers aluminium HA

2.3 Aluminium HN and HT wheels-in trailer

The HA is equipped with anodised aluminium drop sides.
The rear and side drop side can be folded down and removed.
The locks are recessed in the drop sides.
The 15-mm thick floor plate is made of multiple layers of lami­nated wood and an anti-slip coating.

The HA is available braked with 2000 kg and 2500 kg gross weight.
The HA permits a wide range of applications for payloads of up
to 2113 kg.
The load is secured with the aid of 6 tie-down brackets integrat­ed into the side drop sides.
The tie-down brackets are Dekra-tested and allow a tractive force
of 400 daN (kg) per tie-down bracket.
The tyres have a standard size of 13" or 15" (inch).

The HN/HT is equipped with anodised aluminium drop sides.
All of the drop sides can be folded down and removed.
The locks are recessed in the drop sides.
The 18-mm thick floor plate is made of multiple layers of lami­nated wood and an anti-slip coating.
The load height with HN is lower than with HT due to the smaller
wheels.

HN

The HN is available braked with 2000 kg, 2500 kg and 3000 kg
gross weight.
The HN permits a wide range of applications for payloads of up
to 2495 kg.
The load is secured with the aid of 4 tie-down brackets recessed
into the V-profile of the trailer frame.
The tyres have a standard size of 10" (inch).

HT

The HT is available braked with 2000 kg, 2500 kg, 3000 kg 3500 kg
gross weight.
The HT permits a wide range of applications for payloads of up
to 2930 kg.
The load is secured with the aid of 4 tie-down brackets recessed
into the V-profile of the trailer frame.
The tyres have a standard size of 13" to 15" (inch).

HA front view

HA rear view

HN front view

HT front view

HT / HN rear view

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2.4 Special versions

1

2

Ramp wall with tarpaulin cover

Ramp wall rear view

Tarpaulin cover without drop sides

Vehicle transporters

HN with aluminium checker plate, rear view

Tarpaulin cover without drop side

3-axle trailer

HN with cable winch frame, front view

Long drawbar

1333

1621

HN / HT with long drawbar, side view

1. Standard drawbar

2. Long drawbar (288 mm longer)

3-axle trailer rear view

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2.5 Optional accessories

H-frame Side wall extension

Wood/aluminium cover Rail

Cover net Two-part drop side

Drawbar toolbox HN/HT toolbox

Drawbar spare wheel Side spare wheel

Prop stand Telescopic prop stand

Flat cover Tarpaulin + frame

Steel mesh extension Aluminium checker plate

Aluminium drive-up ramp Grid ramp wall

Lashing ring HV drawbar

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3 Intended use

• Transport of goods, with the exception of hazardous
goods, e.g., explosive, chemical or liquid materials.

• Transport of fixed and loose loads.

• Transport of long loads (e.g., square timber, profiles).

• Transport of materials and load materials as solid/packaged
load units, such as bricks on pallets.

• Load securing on the cargo bed with lashing brackets using
form and force load securing methods.

3.1 HA

• Transport of vehicles – only for version with grid ramp wall.

3.2 HN / HT

5 General safety instructions

Observe the other general safety recommendations in
the operating instruction manual, “Trailers up to 3.5 to”
(General Points – Part 1).

WARNING

Driving with folded down/unsecured

drop sides/side wall extensions.

Folded down/unsecured drop sides and side wall extensions may

be torn off and flung away while driving – risk of impact/crushing!

Folded down drop sides cover the vehicle lights/vehicle

markings – increased accident risk!

• Transport of large loads as a flat-bed variant, without drop
sides and stanchions.

• Transport of vehicles – only for version with drive-up ramp.

4 Foreseeable misuse

• Transport of persons and animals.

• Driving with insufficient load securing.

• Driving with an unsecured, projecting load.

• Driving with the wood/aluminium cover/drop sides not locked.

• Driving with side wall extensions/H-frame not bolted to
stanchions.

• Driving with support devices not retracted at the rear.

• Transport of inadequately secured vehicles.

• Non-observance of the safety instructions in the operating
instruction manual, “Trailers up to 3.5 to” (Part 1).

4.1 HA

• Overloading the grid ramp wall.

• Driving with unsecured grid ramp wall.

4.2 HN / HT

• Overloading the drive-up ramp.

• Driving as flat-bed without drop sides, but with inserted
stanchions.

►► Before driving off, check that all drop sides/side wall

extensions are closed and secured.

►► Remove all drop sides/side wall extensions/

stanchions when using the trailer as a flat-bed.

Loading/unloading bulk goods!

The bulk goods can press against the drop sides
during loading. Unsecured drop sides may spring
open, presenting a hitting/crushing risk!

►► Before loading bulk goods, make sure that all drop sides

are closed and secured.

►► Stand to one side when unlocking the drop sides – not

directly in front of it.

Materials on the trailer!

Materials such as snow/ice can be thrown on the road during
the journey – accident risk!

►► Remove ice and snow from the cargo bed/tarpaulin in

general and before driving off.

►► Check that there are no loose objects on the cargo bed/

tarpaulin before driving off.

Tandem HA, HN & HT Operating Instruction Manual (Part 2)

Loose objects on the cargo bed

Climbing on the tarpaulin is absolutely prohibited!
The operator accepts full responsibility if this is disre­garded.

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6 Loading and unloading

CAUTION

6.2.1 Loading/unloading the trailer

Folding ramp wall

After unlocking, the ramp wall can fall down
uncontrollably, e.g., from load pressure – impact
risk!

This can result in feet being crushed.

►► Stand to the side when unlocking the ramp wall.

►► Relieve the load pressure beforehand if necessary.

►► Allow the ramp wall to fall to the floor if the gas struts

are defective.
Never try to stop it.

►► Keep your feet away from the area around the

ramp wall.

►► Keep people away from the area around

the ramp wall during unfolding.

►► Use .

Walking on the mudguards is prohibited!

You can fall if you walk on the mudguards, since
the plastic mudguard gives way.

►► Do not climb on the mudguards.

The trailer must be secured so it cannot roll away.

►► Make sure that road traffic safety is not impaired

when loading and unloading the trailer.

►► If necessary, use additional signalling devices, e.g., signs,

barriers.

6.1 Load distribution

Before loading, check the max. load capacity that you
are able to transport with your trailer.
Check that the max. permissible body dimensions of
your trailer are not exceeded.

The load distribution works directly on the road handling of the
towing vehicle tension.

►► If necessary, use a stable access aid, e.g., a ladder or stool.

NOTICE

Poor/one-sided load distribution of the goods!

Strongly uneven/point load distribution can lead to

overstressing and damage to the trailer components.

►► Before loading your trailer, check which

load objects are the heaviest.

►► Position the heaviest objects centrally on

the cargo bed and in the area of the axles.

►► Distribute the goods evenly over the cargo bed

- Avoid point/one-sided load distribution.

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Correct load distribution

kg

Load in axle area

6.2 Load securing

For relevant safety information for load securing, refer to
the section “General load securing” in the operating
instruction manual “Trailers up to 3.5 to – General part 1.”

WARNING

Unsecured load!

The load can be thrown around during the journey. The trailer

may start to lurch – accident risk!

The trailer and the towing vehicle are stable with all wheels on
the ground.

Incorrect load distribution

kg

Load too far forward (toward motor vehicle)

The trailer tilts forwards; the towing vehicle tilts backwards = the max.
drawbar load has been exceeded.

Incorrect load distribution

►► Make sure that the load is secured by form and force-fit-

ting before driving off.

►► If required, have tie-down points retrofitted.

►► Ideally, secure the load with a combination of form-fitting

and force-fitting:

- Force-fitted by: Direct tie-down of the load.

- Form-fitted by: Supporting the various components
of the load against each other, against the drop sides
and against the cargo bed extensions, without spaces
in-between.

kg

Load too far backwards (from motor vehicle)

The trailer tilts backwards; the towing vehicle tilts forwards = the
drawbar load is too low or is negative.

Tandem HA, HN & HT Operating Instruction Manual (Part 2)

Tie-down options

The hook of the ties can be fastened to the tie-down bracket
from the inside or from the outside.

Loose load, not secured

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Secured with tie-down

6.2.1 Projecting load

In Germany, goods that project over the cargo bed or
drop sides must be marked in accordance with
Section 22 of the StVO (German Road Traffic Act).

> 1 m

Marking goods

1. Sign/flag (30 cm x 30 cm) or cylindrical body (ø 35 cm x 30 cm),
bright red

►► Check that your load does not exceed the maximum

permissible values according to Section 22,
“Goods,” of the StVO.

►► Mark any projecting goods.

- Make use of the prescribed means for doing so.

►► Do not load the goods too far forward.

- The required swerving range for driving around bends
must remain open!

Secured with tie-down

Secured with tie-down

WARNING

Restricted swerving range – risk of collision!

Supporting the load on the front drop side and allowing it to

project forwards reduces the swerving range when driving

around bends – accident risk!

►► Before driving off, check that the restricted swerving

range will allow your towing vehicle to drive around
bends.

►► Adjust the distribution of the load towards the centre

between the drawbar if necessary.

►► If necessary, remove the front drop side.

Secured with form-fitting and tie-down

Driving with open front drop side

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6.2.2 Tie-down points

2

Tying down goods

31

HA - tie-down points (tie-down force = max. 400 daN (kg))

1. Loading platform

2. Tie-down brackets, recessed

3. Side drop side

1

Optional/additional tie-down points

1. Tie-down ring recessed in tie-down groove, in loading platform

(tie-down force = max. 400 or 200 daN (kg))

2

1

HN/HT - tie-down points (tie-down force = max. 400 daN (kg))

1. Loading platform

2. Tie-down brackets, recessed

3. V-frame profile

3

►► Tie down the load.

- Do not exceed the maximum permissible tie-down
forces per tie-down point.

►► Take note of the sticker providing information about the

maximum tie-down forces on the trailer.

1

Optional/additional tie-down points

1. Folding rings on the loading platform

3

2

1

Tie-down of load

1. Tie-down point

2. Tie-down equipment (tension belt)

3. Tie-down force information

►► Adhere to the maximum tie-down force for the tie-down

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equipment (e.g., tension belts).

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6.3 Drop sides

WARNING

NOTICE

WARNING

1

3

4

5

6

Driving with the rear drop side folded down!

Any rear lights are covered. The trailer cannot be seen in

traffic – danger of accident!

►► Remove the rear drop side when driving with a load

projecting to the rear.

Driving with the front drop side folded down!

The front drop side is not secured and can move while

driving – risk of material damage!

►► Remove the front drop side when driving with a load

projecting to the front.

6.3.1 Drop side – HN / HT

Functional explanation

• The 4 drop sides can be folded down, depending on the
loading/unloading process.

• The drop sides can be removed in order to transport longer
and wider cargo.

• The stanchions are secured by the closed drop sides to
prevent them from falling out.

• The stanchions can be removed when the drop sides are
removed.

2

Drop sides and stanchions fitted

1. Side drop side

2. Front drop side

3. Rear drop side

4. Stanchion

5. Covered lock

6. Drop side hinge

Opening

1

2

Driving as flat-bed with stanchions inserted!

The stanchions may be flung out while driving and hit

people – risk of accident/impact!

►► Remove all drop sides before starting to drive.

►► Remove all stanchions before starting to drive.

Driving as flat-bed (drop sides/stanchions removed)

Unlocking locks

1. Drop side

2. Covered lock

►► Unlock the recessed locks on both sides.

- While doing so, hold the drop side with one hand.

Folding down the rear drop side

►► Carefully fold down the drop side in a controlled manner.

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Taking off the drop side

2

Drop side hinge release

1

3

1

Rear drop side, folded down

1. Rear drop side, folded down

Closing

1. Securing split pin

2. Drop side hinge

3. Drop side

►► Remove the securing split pin from the drop side hinge.

►► Hold the drop side in about the middle lengthwise.

►► Fold the drop side to a horizontal position.

Taking off the drop side

►► Carefully pull out the drop side in the direction that is

now unobstructed.

►► Put the drop side where it is safe from damage.

Closing the drop sides

►► Open the covered locks as required.

►► Fold up the drop side.

►► Lock all locks on the drop side.

While doing so, hold the drop side with one hand.

- Ensure that they correctly engage with the locking lugs
of the stanchions.

1 2

Removing stanchion removed

1. Stanchion

2. Stanchion pocket

►► Pull the stanchions out of the stanchion pockets.

If the stanchions are stuck:

►► Release them by carefully tapping the side with a soft-

head hammer.

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