Gradall 534B (9020-7317) Service Manual - Manual (Page 103)

Burnishing Procedures
for MICO Caliper Disc Brakes
TECHNICAL NOTICE
Maximum torque will be achieved only after the
brake has been properly burnished. Actual customer
testing will be required to determine final acceptance
and approval of brake system components.
MICO recommends the following SAE burnishing pro-
cedures be performed immediately following the installa-
tion and adjustment of the brake. These “SAE
recommended practices” (J360; paragraph 7.3 for
parking brakes and J786a; paragraph 5.5 for service
brakes) are intended to be used as guidelines only.
Contact the vehicle (or equipment) manufacturer for
specific recommendations.
PARKING BRAKE: Make 10 stops from 10 mph
(45 m/s) at 3 ft/s
2
(0.9 m/s
2
). Space the stops a mini-
mum of 2.5 miles (4000 m) apart and operate the
vehicle at 20 mph (9 m/s) between stops.
SERVICE BRAKE: Make at least 200 “Brake Snubs”,
not less than 50 in a series, from 40 to 20 mph (64 to
32 km/hr.) at 10 ft/s
2
(3 m/s
2
) in normal gear range.
[A “Brake Snub” is the act of retarding a motor vehicle
between two positive speed values by the use of a
brake system.]
Accelerate to 40 mph at moderate acceleration after
each “snub” and drive 40 mph (64 km/hr) between
snubs.
At every 25th application (minimum), make a full stop
from 40 mph (46 km/hr.).
APPLICATION INTERVALS:
•
For light trucks and buses [6,000-10,000 lb.
(2,700-4,500kg) GVW]: 1.0 mile (1.6 km)
•
For truck, bus, and combination of vehicles [over
10,000 lb. (4,500 kg) GVW]: 1.5 miles (2.4 km)
NOTE: Other burnish procedures which produce
similar braking conditions and performance charac-
teristics are permissible.
After burnishing, adjust the parking brake and actuation
system in accordance with MICO specifications (or the
appropriate manufacturer’s specifications for compo-
nents of the actuation system not supplied by MICO).
Immediately following any dynamic stop resulting from
the application of the parking brake, the brake and disc
must be inspected for any unusual wear or conditions
and then adjusted in accordance with MICO specifica-
tions.
Recommended Disc Material
High quality brake discs should be used in
conjunction with MICO Caliper Disc Brakes.
Depending on strength and performance
requirements, low to medium carbon steel is
generally recommended. Fabrication proce-
dures are as follows:
1. Flame cut or machine to required
outside diameter with inside diameter
machined to size.
2. Stress relieve after all machining
operations.
3. Blanchard ground to a surface finish
of 54 Ra to 72 Ra with a visible cross-
hatch pattern.
4. Surfaces to be parallel within .05 mm (.002").
5. Surfaces to be flat within .13 mm (.005").
Form No. 81-950-016 Revised 10/14/98 Printed in U.S.A.
MICO could not possibly know of and give advice with respect to all conceivable applications in which this product may be used and the possible hazards and/or
results of each application. MICO has not undertaken any such wide evaluation. Therefore, anyone who uses an application which is not recommended by the
manufacturer, first must completely satisfy himself that a danger will not be created by the application selected, or by the particular model of our product that is
selected for the application.
MICO has made every attempt to present accurate information in catalogs, brochures and other printed material. MICO can accept no responsibility for errors from
unintentional oversights that may exist. Due to a continuous program of product improvement, both materials and specifications are subject to change without no-
tice or obligation.
MICO is a registered trademark of MICO, Incorporated. MICO is registered in the U.S. Patent and Trademark Office as well as in Canada, Great Britain, South Korea, and Australia.
MICO, Incorporated MICO West Division
1911 Lee Boulevard (Zip Code 56003-2507) 701 East Francis Street (Zip Code 91761-5514)
P.O. Box 8118 / North Mankato, MN U.S.A. 56002-8118 P.O. Box 9058 / Ontario, CA U.S.A. 91762-9058
(
507.625.6426 Facsimile 507.625.3212
(
909.947.4077 Facsimile 909.947.6054