Mach III Clutch 98BK & 98BK-ULOW User Manual
Page 5
7/10/2013
BRAKES_SENSIFLEX_BK_MANUAL
Page 5 of 5
Diaphragm Replacement (Continued)
by applying pressure while gliding a finger along each perimeter of the diaphragm and then
assure that the lips are fully seated by running your thumb across the surface of the diaphragm in
a clockwise motion several times.
2. Bearing Inspection & Replacement
Check bearing for external damage (missing seal, etc.). Make sure the bearing rotates freely and
smoothly by hand. OD of bearing is press fit into the cylinder. If bearing replacement is
necessary, remove additional retainer ring (at the bearing OD). The bearing should be removed
from the cylinder using an arbor press. New bearing should be pressed back into the cylinder and
outer retainer ring must next be replaced.
If new bearing was not installed, gently scrape away any Loctite® residue from the inside diameter
of the bearing in the air cylinder and assure that surface is clean.
C. REASSEMBLY
1. Reassembly from the point of diaphragm and/or bearing replacement:
Make sure that face of diaphragm is free from debris. Apply a thin coat of grease (such as
Molykote® G-N Metal Assembly Paste) to the polygon shaped I.D. of the piston. Reconnect
air cylinder and piston by carefully lining up clearance holes in piston over threaded holes in
cylinder. Place springs over studs and snug-screw studs into cylinder. DO NOT OVER-TIGHTEN.
Apply a thin coat of Loctite® #609 retainer compound to the inside diameter of the bearing, then
slide the air cylinder assembly over the drive hub. Applying an excessive amount of Loctite® will
make future disassembly more difficult. Replace the inner retainer ring at cylinder end of the
drive hub (outer retainer ring should have already been replaced) making sure that it is fully
seated in the groove provided in the hub.
2. Reassembly from the point of friction disc replacement:
Replace wave spring if worn. Wave spring should be placed over the drive hub and seated onto
the flange located above the studs. Apply a thin coat of grease (such as Molykote® G-N Metal
Assembly Paste) to the hex shaped I.D. of the drive disc. Replace drive disc. Place nut on
threads and tighten using spanner wrench to a point where a 0.010 - 0.020 gap remains between
the friction and drive disc surfaces.
It is recommended that a 0.010 feeler gauge be used. Drive
disc 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.
See Installation of Brake section of this document for the proper re-installation procedure.
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