PRONAR T680, Operator'S Manual, Page: 110 / 147

Pronar T680 SECTION 5
5.12
5.2.8 ADJUSTMENT OF MECHANICAL BRAKES
Considerable wear of brake shoe linings results in increased brake cylinder rod stroke and
worse braking efficiency.
TIP
Correct brake cylinder piston stroke should be within the range of 25 – 45 mm.
During braking, the brake cylinder piston stroke should be within the specified operating
range. Braking force decreases when the operating angle of the brake cylinder piston (5), in
relation to the expander arm (1), is wrong – figure (5.5). In order to obtain the optimum
mechanical operating angle, the cylinder piston fork (5) must be installed on the expander
arm (3) in such a manner as to ensure that the operating angle at full braking is about 90°-
figure (5.6).
ATTENTION
Incorrectly adjusted brake may cause rubbing of brake shoes against brake drums, which
may lead to faster wear of brake linings and/or brake overheating.
TABLE 5.2
Operating data of pneumatic cylinder
NOMINAL CYLINDER
STROKE
L [mm]
MINIMUM CYLINDER
STROKE
L
MIN
[mm]
MAXIMUM CYLINDER
STROKE
L
MAX
[mm]
75 25 45