4.4
Friction Material Replacement
(Sizes 8 and 14)
Note: When replacing friction material, it is
recommended that the mating wear surface be
replaced or machined flat to ensure good
contact between the mating surfaces. See
Table 14 for wear limits.
4.4.1
Friction disc cores may be relined with new
friction material per the following instructions.
Refer to Section 6.0 for the appropriate friction
disc replacement kit part number.
Use only genuine, Airflex friction
material. Use of material not of Airflex
origin may result in unpredictable
brake performance and/or excessive
wear of the brake components.
4.4.2
Drill out the old rivets and discard the old
friction discs.
4.4.3
Clean and de-burr the friction disc cores. If rivet
holes in the core are elongated or damaged, the
disc core should be repaired or replaced.
4.4.4
Position the friction discs on both sides of the
disc core and align the rivet holes, using several
rivets as a guide.
Manual setting of the rivets using
a punch very frequently results in
splitting of the clinched end of the
rivet. When this occurs, the rivet will
ultimately fail in service due to fatigue.
It is therefore recommended that rivets
be set using an automatic rivet setting
machine if possible.
4.4.5
Insert a rivet through any hole and set using a
washer on the clinched end of the rivet. Figure
12 illustrates machine setting and Figure 13
illustrates setting the rivet manually. When
setting manually, use an arbor press and keep
the setting tool square to avoid splitting the rivet.
The clinched end of the rivet must have
a washer in place prior to clinching.
Failure to use the washer or use of
excessive force when clinching the
rivet will fracture the friction lining.
4.4.6
The remaining rivets may be installed
in any reasonable sequence following
a crosswise pattern.
After replacement of friction material,
a minimum wear-in period of four
hours at 50% of the rated horsepower
is recommended for the friction couple
to achieve rated torque.
4.5
Friction Material Replacement
(Sizes 18, 24, 36 and 48)
Note: When replacing friction material, it is
recommended that the mating wear surface
be replaced or machined flat to ensure good
contact between the mating surfaces. See
Table 14 for wear limits.
4.5.1
Refer to Section 6.0 for the appropriate friction
disc (or block) replacement part numbers .
Use only genuine Airflex friction
material. Use of material not of Airflex
origin may result in un-predictable
performance.
4.5.2
Disassemble the tensioner per Section 4.3.
Rivet
Friction
Disc
Washer
Anvil Pin
Friction Disc Core
Driver
Friction Disc
Core
Punch
Washer
Friction
Disc
Anvil
Rivet
Figure 12
Figure 13
WCB 11070 VP 4.2 Format
19
© Copyright Eaton Corp., 2003. All rights reserved
April 2002 (Revised June 2003)