PRONAR PT510, Operator'S Manual, Page: 103 / 133

SECTION 5 Pronar PT510
5.11
Mark position of expander arm (1) with regard to the shaft (2).
Dismantle arm and set it in the appropriate position.
in direction (A), if braking is too early,
in direction (B), if breaking is too late.
Repeat the process for the second arm.
Replace the pin fixing the cylinder fork to expander arm.
FIGURE 5.4 Adjustment of axle mechanical brakes
(1) expander arm, (2) expander shaft, (3) pin, (4) cylinder fork
Adjustment should be conducted separately for each wheel. Expander arm (1) should be
moved by one notch in chosen direction. If the extent of cylinder action is still incorrect, move
the lever again. After proper brake adjustment, at full braking, the expander arms should
create the angle 90
0
with the cylinder piston, and the stroke should amount to approximately
half the length of the total stroke of the piston. After brake release expander arms may not be
supported on any structural elements, because too little withdrawal of a piston ram may
cause abrasion of brake shoes in drum and result in overheating trailer brakes. Expander