Mach III Clutch 118SI & 118SI-ULOW User Manual
Page 5
7/10/2013
CLUTCH_SENSIFLEX_SI_MANUAL
Page 5 of 5
D. DIAPHRAGM INSPECTION & REPLACEMENT
Diaphragm replacement should rarely be necessary if the air supply is regulated and free of
contamination and if the gap between the friction and drive disc is properly set.
Separate the air cylinder and piston by pulling apart taking care not to bend pins. Pinch the
diaphragm and pull from the grooves which retain it. Make sure that the retaining grooves and
surface underneath the diaphragm are clean & free from debris. Lubricate the new diaphragm
(if replacement is necessary) with an O-ring lubricant such as Dow Corning® #4. Install with the
lips located on the ID and OD of the diaphragm facing downward. Press the lips into the
grooves by applying pressure while gliding a finger along each perimeter of the diaphragm.
Assure that the lips are fully seated by running your thumb across the surface of the diaphragm
in a clockwise motion several times.
E. REASSEMBLY
1.
Apply a thin coat of grease (such as Molykote® G-N Metal Assembly Paste) to the hex
drive surface of the drive hub. Be sure the spring is in place over drive hub and
surrounding the hex portion of the hub. Place piston/drive disc assembly over drive
hub. Drive disc assembly should move freely over hex.
2.
Place cylinder assembly over hub. Align pins in the holes in the piston and manually
press the cylinder downward to reconnect with piston. The cylinder assembly will not
fully seat until the retaining nut is tightened.
3.
Place the adjustment nut on the threads and tighten to a point where a 0.010 - 0.020
gap remains between friction lining and sleeve input member. It is recommended that a
0.010 feeler gauge be used. Sleeve output member should turn freely after reassembly.
If you can feel contact between the friction and drive surface when rotating, loosen
adjustment nut just enough to provide clearance. Tighten set screw in adjustment nut
snuggly when proper clearance has been achieved.
4.
See “Installation” section on Page 2 of these instructions for the proper procedure for
re-installing the clutch.
Technical assistance is available by contacting Mach III Clutch, Inc.
Mach III Product Warranty
Mach III Clutch, Inc.
101 Cummings Drive ● Walton, KY 41094
Toll free 866.291.0849 ● International 859.291.0849 ● Fax 859.655.8362