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16.1 Introduction
Attention
The user forfeits all rights to claim if
parts other than those of the
manufacturer are used.
We reserve the right to modify design and
performance without prior notice. Please
quote axle number, model and article
number when contacting us with queries or
ordering spare parts.
16.2 Safety
* It is most important that the wheel and
the hub are compatible dimensionally.
This means that the P.C.D., wheel bolts
and inset must all be compatible both
with the hub and the rim. Particular
attention must be paid to the
recommended torque figures for the
wheel bolts.
* No welding is permitted on the AL-KO
axle.
* Please note the swing arm movement.
(See assembly instructions).
* The AL-KO wheel brakes are matched
to the AL-KO overrun devices.
Before using an overrun from another
manufacturer, please check the
compatibility with our Technical
Department.
Attention
Model details must not be obscured by
paint now concealed by components.
16. Undercarriage
16.3 KHV13 height-adjustable
towing system, model B 3.5.13
The adjustable joint between the drawbar
and intermediate arm, and between the
overrun system and intermediate arm,
consists of toothed heads or retainers with
Hirth-type or radial serrations.
The radial serrations are secured with
fastening screws. The fastening nut must
be tightened to the specified torque in order
to establish a no-play, torque transmitting
connection. The tightening torque depends
on the permitted gross weight of the trailer
and the length of intermediate (swivelling)
arm
Adjusting procedure
After the spring-loaded plugs have been
released from the fastening nuts, the nuts
can be loosened until the teeth are
exposed. The angle of the intermediate
arm can then be adjusted.
Danger
Care must be taken without fail to
ensure that the overrun or towing
system is always aligned parallel with
the drawbar.
The vehicle must not be driven unless
the overrun system is parallel with the
drawbar!
After the coupling has been adjusted for
height, the serrations should be locked
together with the clamping nuts and
secured against working loose by means
of the spring-loaded plugs.
The radial serrations of the intermediary
piece and the drawbar are joined by union
bolts M28x1.5 and M36x1.5 respectively.
M28x1.5 T = 400 Nm
M36x1.5 T = 650 Nm
The radial serrations of the intermediary
piece and the run-up assembly are joined
by union bolts M20x1.5 and M28x1.5
respectively.
M20x1.5 T = 250 Nm
M28x1.5 T = 400 Nm
16.4 Braking system
Introduction
* KNOTT over-run brake systems consist
of over-run hitches and wheel brakes
used in combination with KNOTT
torsional thrust spring axles. They are
approved in all countries of the EC and
in Switzerland.
* With the KNOTT autoreverse system
‘Backmat’ there is no problem changing
the direction of travel from forward to
reverse. The braking system is ready for
immediate operation again when
changing from reverse to forward travel.
* KNOTT torsional thrust spring axles as
well as rubber spring axles have superb
springing and excellent dampening
characteristics. With the torsional thrust
spring axles the spring elements with
their vulcanized rubber are pretensioned
before being pressed into the axle
tubes. There is no squashing of the
rubber during spring action. Instead the
rubber is stretched in accordance with
its characteristics.
With the rubber spring axles theaxle
tube bears the axle by pretensioned
rubber strings. The results of the
stretching are exceptionally long life and
zero maintenance.
Attention
* Use the jack only under the fixing
brackets or at the chassis, never in
the centre.
* Towing eye and ball coupling may
only be changed by specialists.
* Use a new safety nut every time one
of these items is changed.
* Use specified torque setting:
Ball coupling
M12 8.8: T = 77 Nm
M14 10.9: T = 125 Nm
Towing eyes
M12 10.9: T = 115 Nm
M14 10.9: T = 180 Nm
* When using the ball coupling, please
follow the instructions given.
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