5020-M Owner's Manual
Kobelt Manufacturing Co. Ltd.
rev B
mnl5020-M.docx
13 of 27
4
C
OMMISSIONING
4.1
A
IR
G
AP
The running clearance between the pads and disc is factory set and not adjustable. As a
check prior to putting the brakes into service, ensure that the airgap between the brake pads
and disc when the brakes are released is at least 0
.01” [
0.25 mm] per shoe.
If the pads have worn excessively (0.25 inches [6.4 mm] or more per side), the shoes can be
shimmed with a 5020-0750 shim kit.
4.2
F
UNCTION
T
EST
Before burnishing the brakes perform a quick inspection and function test of the brakes:
1.
Ensure that all mounting bolts are properly installed.
2.
Ensure proper running clearance (air gap) with the disc.
3.
Ensure unobstructed movement of the brake levers for full actuator extension.
4.
Ensure the brake disc surface is clean. Remove all contamination from the disc with
cleaning solvent.
5.
Check that all bolts are tight and cotter pins are in place.
6.
Cycle the brakes and ensure that the brakes are operational (reference section 5.2 for
operating the brake).
4.3
B
URNISHING
Burnishing is required in order to achieve rated brake torque. The process of burnishing
removes minor contaminants from the rubbing surfaces and improves the degree of contact
between the brake pad and disc.
Before burnishing, the brake disc must be checked to ensure it is free from contamination
and oil. Use a solvent and cloth to remove any oil residue. Slight surface rust will be removed
during the burnishing process, but heavy rust should be removed prior to burnishing.
If present, safety interlocks of the drive mechanism should be temporarily defeated to allow
the disc to be driven with the brake partially applied.
The temperature of the disc surface must be monitored during the burnishing process and
kept between 250
o
F (120
o
C) and 500
o
F (260
o
C). If the upper temperature is reached, pause
the burnishing process until the disc is cooled to the lower limit.
Extreme care must be taken not to overheat the disc during the process. On water cooled
discs it may be necessary to limit the flow of cooling water in order to achieve the necessary
disc temperature for effective burnishing.
