Checking Of Mechanical Brakes - PRONAR T679/4M User Manual

Chapter 5
5.12

CHECKING OF MECHANICAL BRAKES

In a correctly adjusted brake, the piston
stroke (X-Y) (FIGURE 5.10) of the cylinder
should be within the range given in Table
5.3 and depends on the type of cylinder
used. When the wheel is fully braked, the
optimal angle between the expander lever
and the piston rod should be approx. 90
°. With this setting, the braking force is
optimal. Checking the brakes consists in
measuring this angle and the piston rod
stroke in each wheel.
THE SCOPE OF ACTIVITIES
• Measure the distance X with the
tractor brake pedal released.
• Measure the distance Y with the
tractor brake pedal pressed.
• Calculate the distance difference X-Y
(rod stroke).
• Check the angle between the cylinder
piston axis and the expander lever.
• If the expander arm angle (2) and
piston rod stroke exceed the range
given in table 5.3, the brake should
be adjusted.
5.16 PRONAR T679/4M
Technical inspection schedule
X
Y
B
A
4
3 2 5 1
X
Y
B
A
4
3 2 5 1
Figure 5.10 Service brake control
(1) cylinder piston
(3) adjustment screw
(5) pin position
(A) position of the arm in the released position
(B) arm position in braking position
609 I.05-1
(2) expander arm
(4) of the cylinder fork
I.3.2.589.12.1.EN