Mach III Clutch D5C3R-21H , D5C3R-21HCA & D5C3R-21HSS - Manual (Page 2)

7/9/2013 BRAKES_NEMA_SPRING_MANUAL Page 2 of 4
I. New Brake Torque
New brake torque is approximately 40% less than rated design torque until the friction
and drive discs are worn in (lapped, burnished). The length of time for wear-in to occur
depends upon the application.
II. Brake Installation
A. SHAFT PREPARATION
Mach III Clutch products are bored to fit a precision plug gauge for the specified bore size and
should slide fit the mating shaft. Make certain that the shaft is free of burrs or nicks. It may be
necessary to file or sand the shaft to assure a slide fit. Never hammer the brake onto the
shaft. Hammering on the brake may cause evident damage or subtle injury that will shorten the
wear life of the unit, and will void the warranty.
(1) Apply the anti-seize (E-Z Break
®
) lubricant from the packet provided, or equivalent, to
the shaft.
(2) Insert key (customer supplied) onto the shaft.
(3) Slide brake over key on the shaft.
B. MOUNTING
The brake mounts between a motor and gear reducer. These units are not suitable for belt drive
(pulley output) applications. Consult factory for options.
C. AIR LINE CONNECTION
Refer to the dimensional spec sheet for NPT size to obtain correct fitting. Install fitting using a
thread sealing compound to prevent air leakage. Connect an air line to the fitting. Air supply
should be both filtered and regulated. Contamination in the air supply may damage the brake.
D. FINAL INSPECTION & TESTING
Cycle the brake with the machine off to check for air leaks and to ensure proper engagement and
release. After a short run, check mounting screws.
III. Brake Operation
This brake is spring engaged (air released). The air pressure required to release the
brake is between 60 and 70 PSI. For maximum life of the brake, air pressure should not
exceed 80 PSI.
Special Note Regarding Friction Disc Contamination:
The friction material used in this product will absorb oil, water, chemicals and other
contaminants. Depending on the type of contamination, brake may either seize up
entirely or lose torque capacity. If friction discs become contaminated, they should be
replaced. See repair kit ordering information below. If application requires exposure to
contamination consult factory for optional covers.
IV. Routine Maintenance
When installed and operated according to the preceding guidelines, Mach III clutch
products should require little or no routine maintenance. A repair kit is available which
contains all parts subject to typical wear: friction discs, springs and O-rings.