Mach III Clutch D5C3R-21H, D5C3R-21HCA, D5C3R-21HSS User Manual

CLICK on product numbers
above to obtain the product detail
sheet which includes dimensional

data helpful during installation.

Installation & Maintenance Manual

NEMA FRAME SPRING ENGAGED FRICTION BRAKES

Catalog Products:
D3C3R-56H , D3C3R-56HCA & D3C3R-56HSS
D3C3R-14H , D3C3R-14HCA & D3C3R-14HSS
D5C3R-18H , D5C3R-18HCA & D5C3R-18HSS
D5C3R-21H , D5C3R-21HCA & D5C3R-21HSS

And non-catalog variations of this brake design.

Mach III Technical Support

Toll Free: 866-291-0849

International: 001-859-291-0849

Email: [e-mail]

www.machiii.com

Detail sheets and 3D models are available on the Mach III website:

http://www.machiii.com/Products/Brakes/Spring-Set-Brakes/NEMA-Frame-Spring-Set-

Brakes-C-Face-Mount.asp

Please contact Mach III to obtain assembly and parts list drawings.

This product includes rotating equipment and should be guarded according to

OSHA requirements and other Federal, State and local regulations. It is the

responsibility of the user to provide necessary guarding.

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© Mach III Clutch, Inc. All Rights Reserved

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.

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