Mach III Clutch X7C2R-21H, X7C2R-21HCA, X7C2R-21HSS - Manual (Page 2)

7/9/2013 CLUTCHBR_NEMA_MANUAL Page 2 of 4
I. New Clutch-Brake Torque
New clutch or 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. Clutch-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 clutch-brake over key on the shaft.
B. MOUNTING
The clutch-brake mounts between a motor and gear reducer. These units may be 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 clutch.
D. FINAL INSPECTION & TESTING
Cycle the clutch with the machine off to check for air leaks and to ensure proper engagement and
release. After a short run, check mounting screws.
III. Clutch-Brake Operation
The maximum operating pressure should not exceed 80 PSI. Operation at pressures
greater than that required for proper function will decrease the life of the bearings.
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, clutch or 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.
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.