PRONAR RC2100-2, Operator'S Manual

Page: 91 / 121

SECTION 5 Pronar RC2100-2
5.13
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 air pressure in tyres and visual inspection of steel wheels:
•
every 1 month of use,
•
every week during intensive work,
•
if needed.
5.2.8 ADJUSTMENT OF MECHANICAL BRAKES
During trailer operation drum brake linings are subjected to wear. Piston stroke extends and,
after exceeding the limit value, braking force declines.
Adjustment must be made when:
•
piston rod 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 (5.6), in relation to expander shaft (2). To do this rotate
adjustment screw (4) in appropriate direction to displace the expander lever:
•
in direction B - if brake brakes too late,
•
in direction A, if braking is too early,
Adjustment should be conducted separately for each wheel. After proper brake adjustment,
at full braking, the expander arms should create the angle o 90
0
with the cylinder piston, and
the stroke should amount to approximately half the length of the total stroke of the piston.
After brake release expander arms may not be supported on any structural elements,
because too little withdrawal of a piston rod may cause abrasion of brake shoes in drum and
result in overheating trailer brakes. Expander arms must be positioned in parallel with regard
to each other at full braking. If this is not so, adjust the position of the lever, which has the
longer stroke.