Mach III Clutch 118SI, 118SI-ULOW User Manual
Installation & Maintenance Instructions
SENSIFLEX® SHAFT INPUT TENSION CONTROL CLUTCH
Patent No. 6,578,691 B1
Catalog Products:
38SI & 38SI-ULOW
58SI & 58SI-ULOW
78SI & 78SI-ULOW
98SI & 98SI-ULOW
118SI & 118SI-ULOW
And non-catalog variations
of this clutch design.
Mach III Technical Support
Toll Free: 866-291-0849
International: 01-859-291-0849
Email: engineering@machiii.com
www.machiii.com
Spec sheets and 3D models are available on the Mach III website:
http://www.machiii.com/Products/Tension-Control/Pneumatic-Clutch/SensiFlex-Shaft-Input-Clutches.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.
© Mach III Clutch, Inc. All Rights Reserved
CLICK on product numbers above
to obtain the product detail sheet
which includes dimensional data
helpful during installation.
7/10/2013 CLUTCH_SENSIFLEX_SI_MANUAL Page 1 of 5
X
DRIVE HUB
INPUT MEMBER
FRICTION LINING
AIR INLET
RETAINER NUT
AIR CYLINDER
INPUT FOR REACTION ARM
E
PISTON - DRIVE DISC
ASSEMBLY
SLEEVE
OUTPUT MEMBER
H
BC
Reference Diagram:
Product#
H E X
BC
Air Inlet
Reaction Arm Input
38SI/38SI-ULOW
1.875
0.61
(3) 10 - 24
2.25
1/16" NPT
10 - 24
58SI/58SI-ULOW
2.749
0.87
(3) 1/4 - 20
3.25
1/8" NPT
1/4 - 20
78SI/78SI-ULOW
3.875
1.20
(3) 5/16 - 18
4.50
1/8" NPT
1/4 - 20
98SI/98SI-ULOW
5.000
1.25
(6) 3/8 - 16
5.63
1/8" NPT
1/4 - 20
118SI/118SI-ULOW
6.250
1.50
(6) 7/16 - 14
7.00
1/4" NPT
5/16 - 18
**IMPORTANT**
The gap between the friction and drive surface is factory set between 0.010 and 0.020 Inch.
This is the ideal clearance for proper performance.
Increasing this gap may result in air leaks and damage to the diaphragm actuator.
Decreasing this gap prevents full disengagement of the brake.
I. Installation
A. SHAFT PREPARATION & MOUNTING
7/10/2013 CLUTCH_SENSIFLEX_SI_MANUAL Page 2 of 5
Mach III Clutch products are bored to fit a precision plug gauge for the specified bore size
and should slide-fit your 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. Apply the anti-seize (E-Z
Break®) lubricant from the packet provided, or equivalent, to the shaft. Slide the clutch
over the key on the shaft, align the pulley or sprocket and tighten the set screws.
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