PRONAR T046H, User Manual

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Chapter 6 Technical Support
6.6
PRONAR T046H
mark with a line the position of the
maximum extension of the piston rod
(B).
• Measure the distance between
the lines (A) and (B). If the piston
rod stroke is not within the correct
working range - 25-45mm, adjust the
expander lever.
• Check that the cylinder piston moves
freely and within the full nominal
range.
• Check the correct mounting of the
actuator.
• Check that the actuator ventilation
openings are not clogged with dirt and
that there is no water or ice inside.
• Clean the actuator, defrost if nec-
essary and remove water through
the vent holes. If 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 brake lever (8)
matches the hole of the cylinder fork.
During adjustment, the
diaphragm (2) must rest on the
rear wall of the actuator.
• Install the piston rod fork pin and
washers and secure the pin with
cotter pins.
• Turn the adjustment screw (4)
clockwise to make one or two clicks
in the expander lever adjustment
mechanism.
• Repeat the adjustment on the second
cylinder.
• Apply the brake.
• Wipe previous markings and measure
piston rod stroke again.
• If the piston rod stroke is not within
the correct operating range, repeat
the adjustment.
FUNCTIONAL CHECK
• After completing the adjustment,
carry out a test drive.
• Perform several brakes. Stop the
trailer and check the temperature of
the brake drums.
• If any drum is too hot, correct the
brake adjustment and perform the
test drive again.
J.3.9.622.05.1.EN