LAUMETRIS PTL Series, User Manual

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USER MANUAL Tractor semitrailers PTL 20
The tractor semi-trailer is usually equipped with a pneumatic double-circuit brake system, which acts
upon all the wheels. This system, which is connected to the brake system of the tractor, acts when pressing
the brake pedal of the tractor.
The system has a three-position brake force regulator for each axle, which is controlled automatically,
depending on the weight of the load in the body.
5. STORAGE
The vehicle must be protected against direct sunlight and rain. If the wheels may be exposed to
sunshine, tyre pressure must be reduced. Protection wedges (blocks) must be placed under the wheels.
When preparing for storage, the following must be done:

wash the semi-trailer;

replace or repair any worn-out parts or assemblies;

replace any obsolete hose of the hydraulic system with new ones. This shall be done every 5
years;

paint any scratched or damaged rusted places;

apply grease to joint axles, wheel bearings, and hydraulic cylinders piston rods;

If the semi-trailer is stored outdoors, lift the body and install the mechanical support of the
body.
6. INFORMATION FOR THE USER
6.1. Preparation of the tractor semitrailer for work
IMPORTANT!
Use only a tractor in good working order!
When attaching the semi-trailer to a tractor for the first time, the following must be done:

familiarise yourself with the names and locations of the elements of the semi-trailer;

remove any unnecessary objects from the body;

check the tyre pressure;

check bolt connections and pinning of the joint axles.

Attach the semi-trailer to the tractor in accordance with the following procedure:

lower the hitch loop of the tractor to the height of the drawbar loop of the semi-trailer;
Figure 5. The diagram of the double-circuit pneumatic brake system. 1 – pneumatic coupling head; 2 – air line filter; 3 – main
air brake valve; 4 – braking force regulator (brake valve); 5 – air reservoir; 6 – drainage valve with a ring; 7 – quick release valve ABS; 8
– pneumatic brake chamber; 9 - LSV controller with integrated knuckle joint.