PRONAR T400 Operator's Manual page 100

Pronar T400
Secure the trailer against rolling away using wheel chocks.
Mark the position of piston rod (1) during maximum retraction when the trailer
is unbraked with line (A)
Press the brake pedal on the tractor, mark the position of maximum extension
of the piston rod with line (B).
Measure the distance between the lines (A) and (B). If the piston rod stroke is
not within the correct working range, adjust the expander arm.
Remove the cylinder fork pin.
Memorize or mark the original position of the cylinder fork (5) pin (6) - figure
(5.6), in the expander arm hole (3).
Check whether the cylinder piston moves freely and within the full nominal
range.
Check that the actuator's ventilation openings are not clogged with dirt and
that there is no water or ice inside. Check the correct mounting of the actuator.
Clean the actuator, defrost if necessary and remove water through the
unblocked ventilation holes. If any damage is found, replace the actuator with
a new one. When mounting the actuator, keep its original position relative to
the bracket (7).
Turn the adjusting screw (4) so that the marked hole of the expander arm
coincides with the hole of the cylinder fork
Mount the piston rod fork pin, pads and secure the pin with cotter pins.
Turn the adjusting screw (4) clockwise to make one or two clicks in the
expander arm adjustment mechanism.
Repeat the adjustment on the second cylinder on the same axis.
Apply the brake.
Wipe the previous marks and measure the piston rod stroke again.
During adjustment, the diaphragm (2) must rest on the rear wall of the
actuator - see figure (5.6).
5.14
CHAPTER 5