Pneumatic System Operation - PRONAR T780 Translation Of The Original Instructions

The parking brake system should be inspected annually and in case of need should be
regulated.

5.4 PNEUMATIC SYSTEM OPERATION

As a part of trailer maintenance, it is necessary to conduct inspection of individual pneumatic
systems, giving particular attention to places of all connections. Tightness of the system
should be checked at nominal pressure in system of approximately 600 kPa (6.0 kg/cm
If conduits, seals or other system elements are damaged, compressed air will escape in
these damaged places with a characteristic hiss. Lack of system tightness may be exposed
by covering checked elements with washing fluid or other foaming preparations, which will
not react aggressively with system elements. Damaged seals or conduits, causing leaks
should be replaced. If the cause of the system leak is the outflow from a piston, control valve
body or braking force regulator should be taken to authorised repair provider for repair or
replacement of parts.
Condensation collecting as water should be removed from air tank periodically. In order to do
this open out drain valve (2) placed in lower part of tank. The compressed air in the tank
causes the removal of water to the exterior. After release valve mandrel should automatically
close and stop air flow from tank. Annually before the winter period unscrew drain valve and
clean off accumulated dirt. Replace copper seal.
Annually before the winter period unscrew and clean drain valve.
Inspection of tightness and inspection of pneumatic braking systems in detail should be
conducted at least annually and after repairs associated with this system.
Depending on trailer working conditions, but not less than once in three months, take out and
clean air filter inserts, which are placed in pneumatic system connection conduits. Inserts are
used many times and are not subject to changing unless they are mechanically damaged. In
order to clean insert first reduce pressure in supply conduit. Next slide out the safety slide
lock (1) – figure (5.4A) - filter cover (2) should be covered with other hand. After removing
slide lock, the cover is pushed off by the spring, in the filter housing. The insert and the filter
5.7
2
).