PRONAR T669/1, Руководство оператора, Страница: 102 / 137

Pronar T669/1 SECTION 5
5.12
Proper technical condition and appropriate maintenance of wheels significantly extends the
life of these components and ensures appropriate level of safety to trailer users.
Checking tyre pressure and steel rims:
•
every month of use,
•
if needed.
5.2.8 MECHANICAL BRAKES ADJUSTMENT
During trailer operation drum brake linings are subjected to wear. Piston stroke extends, and
exceeding braking force limiting value declines.
Adjustment must be made when:
•
piston stroke amounts to 2/3 of maximum stroke,
•
expansion levers are not set in parallel to each other during braking,
•
repairs are made to braking system.
Trailer wheels must brake simultaneously. Brakes adjustment involves changing the position
of the expander arm (1) – figure (5.5), in relation to expander shaft (2). To do this rotate
adjustment screw (3) in appropriate direction to displace the expander lever:
•
to the rear - if brake brakes too late,
•
forward - brake brakes too early.
The main brake system should be inspected annually and in case of need should be
adjusted.
Adjustment should be conducted separately for each wheel. After proper brake adjustment,
at full braking the axle shaft expander should create an angle of 90
°
with the pneumatic
cylinder piston, and the stroke should amount to approximately half the length of the total
stroke of the piston. After the brake is released, expander arms may not be supported on any
structural elements, because insufficient withdrawal of a piston ram may cause abrasion of
brake shoes in drum and result in overheating the brakes. Expander arms must be positioned