PRONAR T682, Manual

Page: 95 / 131

SECTION 5 Pronar T682, Pronar T682
5.11
During braking, the brake cylinder piston stroke should be within the specified operating
range and the angle between brake cylinder piston (1) and expander arm (3) should be about
90° – compare figure (5.8). Trailer wheels must brake simultaneously.
FIGURE 5.7 Adjustment of axle mechanical brakes
(1) expander arm , (2) expander shaft, (3) adjustment bolt, (4) pneumatic cylinder, (5) cylinder piston
rod, (6) cylinder fork, (7) cylinder pin
Braking force decreases also when the operating angle of the brake cylinder piston (5), in
relation to the expander arm (1), is wrong – figure (5.7). In order to obtain the optimum
mechanical operating angle, the cylinder piston fork (6) must be installed on the expander
arm (1) in such a manner as to ensure that the operating angle at full braking is about 90°.
The inspection involves measuring the extension length of each brake cylinder rod while
braking at parking. If the brake cylinder rod stroke exceeds the maximum value (45 mm), the
braking system should be adjusted.