PRONAR T669, Operator'S Manual

Page: 100 / 135

Pronar T669 SECTION 5
5.12
Trailer wheels must brake simultaneously. Brakes adjustment involves changing the setting
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.
FIG. 5.5 Adjustment of axle mechanical brakes
(1) expander arm, (2) expander shaft, (3) adjustment bolt, (4) cylinder fork
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