Page 1
CLICK on product numbers above
to obtain the product detail sheet
which includes dimensional data
helpful during installation.
Installation & Maintenance Manual
HEAVY DUTY SPRING ENGAGED FRICTION CLUTCHES
END OF SHAFT MOUNT
Catalog Products:
E5D3K-STH
E6D3K-STH
E8D3K-STH
EAD4K-STH
EBD4K-STH
And non-catalog variations
of this clutch design.
Mach III Technical Support
Toll Free: 866-291-0849
International: 001-859-291-0849
Email: engineering@machiii.com
www.machiii.com
Detail sheets and 3D models are available on the Mach III website:
http://www.machiii.com/Products/Clutches/Heavy-Duty-Clutch/End-of-Shaft-Heavy-
Duty-Clutches-Spring-Engaged.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
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I. New Clutch Torque
New clutch 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. Installing a Sprocket or Pulley
Mach III units are typically shipped from the factory with the required sprocket or pulley
preinstalled. This section pertains only to those who need to install or replace a pulley or
sprocket in the field. Please use the links on page one of this document to obtain the
detail sheet for your unit. This sheet will include the pilot diameter and other dimensions
needed to machine the sprocket or pulley.
Bore the sprocket or pulley for clearance (slide fit) over pilot and drill standard clearance
holes for the number and type of screws on corresponding bolt circle. The cap screws
used to attach the sprocket or pulley should not be longer than the sum of the depth of
the threaded hole plus the thickness of the sprocket or pulley. Otherwise, the cap screws
may bottom out. Tighten all screws to uniform torque based on screw size and use
proper Loctite® (or equivalent) compound to assure a permanent mount.
III. Clutch Installation
A. SHAFT PREPARATION & MOUNTING
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 clutch onto the
shaft. Hammering on the clutch 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 over key on the shaft, align the sprocket or pulley.
(4) Tighten set screws to secure the clutch to the shaft.
B. 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 a flexible air line to the fitting. Do not
use rigid piping. Air supply should be both filtered and regulated. Contamination in the air
supply may damage the clutch.
C. FINAL INSPECTION & TESTING
Check alignment of the sprocket or pulley. Cycle the clutch with the machine off to check for air
leaks and to ensure proper engagement and release. After a short run, check set screws and
alignment.
IV. Clutch Operation
The maximum operating pressure should not exceed 90 PSI. Operation at pressures
greater than that required for proper function will decrease the life of the air seal.
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 may either seize up
entirely or lose torque capacity. If friction discs become contaminated, they should be
replaced. See repair kit ordering information below.
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V. Routine Maintenance
Repair Kit:
Part number = Clutch Product Number + “-RPRK” (e.g. E5D3K-STH-RPRK)
Additional
Parts:
Contact Mach III to obtain a complete listing of additional parts kits available for
your specific clutch. Please reference product number when calling or e-mailing.
Repair
services:
Factory repair is available. A return materials authorization (RMA) number must
be obtained prior to sending any unit in for repair
Tools Required
Hex Wrench Set
Retainer (snap) Ring Pliers
Compounds Required
Grease
O-ring Lubricant
Anti-Seize Lubricant (for re-installation)
CYLINDER
AIR SEAL
PISTON
SEPARATOR SPRING
ENGAGEMENT SPRING
RING GEAR
FRICTION DISC
DRIVE HUB
BEARING
RETAINER RING
SLEEVE
O-RING
SPRING RETAINER
CAP SCREW
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.
VI. Parts diagram
VII. Repair Kit Installation Procedure
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Continued on next page.
Page 4
A. DISASSEMBLY
(1) Remove clutch from shaft and place in vertical position with cylinder end facing upward.
(2) Apply a minimum of 80 psi and remove cap screws in cylinder.
(3) Remove air cylinder with piston and spring retainer from unit.
(4) The disc package (consisting of friction discs, drive discs & release springs) will now be
accessible.
B. FRICTION DISC & RELEASE SPRING REPLACEMENT
(1) Remove the drive discs, release springs and friction discs.
(2) Drive discs should be clean, dry and free of burrs or nicks.
(3) Reassemble drive & friction disc section according to reference drawing using new
friction discs, release springs and iron drive discs as necessary.
(4) Assure that drive discs move freely on the drive hub and that the gear teeth of the
friction disc discs move freely in the ring gear.
C. O-RING REPLACEMENT
(1) Remove air supply from removed cylinder assembly. If needed compress piston in a
hydraulic press to compress the engagement springs and remove retainer ring.
(2) Inspect O-ring seals (in piston and spring retainer). If worn, replace using new O-rings
that have been lubricated with an O-ring lubricant such as Dow Corning® #4 Compound
or equivalent.
(3) A very thin coat of O-ring lubricant should also be applied to the inner wall of the spring
retainer and boss of the cylinder.
(4) Replace engagement springs if necessary.
D. REASSEMBLY
(1) Replace the spring retainer and piston onto cylinder. If needed compress piston in a
hydraulic press to compress the engagement springs and replace retainer ring.
(2) Apply a minimum of 80 psi to the removed cylinder assembly.
(3) Place the air cylinder/piston sub-assembly onto spacer with holes aligned.
(4) Make sure that all components are well seated and replace and tighten cap screws.
(5) See “Clutch Installation” portion of these instructions for the proper procedure for
reinstalling the clutch.
Technical assistance is available by contacting Mach III Clutch, Inc.
Mach III Product Warranty
http://www.machiii.com/Resources/Warranty-Info.asp
Mach III Clutch, Inc.
101 Cummings Drive ● Walton, KY 41094
Toll free 866.291.0849 ● International 859.291.0849 ● Fax 859.655.8362
info@machiii.com ● engineering@machiii.com ● www.machiii.com
7/9/2013 CLUTCH_ENDSHAFT_SPRING_HD_MANUAL Page 4 of 4
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