Danfoss Airflex DBBS Installation, Operation And Maintenance Manual page 18

DBBS Brakes
Friction disc replacement is required when the
friction material is worn to the bottom of the wear
groove or step for size 50 brake, as indicated in
Figure 4, or if oil or grease has contaminated the
surface. In Figure 4 note the location of the wear
grooves on the friction disc on sizes 20, 25 & 38
versus the step on the edge of the friction block for
size 50 brakes.
4.3.1 Reference section 6.3 for Friction Disc Kit part
numbers.
4.3.2 Disconnect the air supply lines from the brake.
4.3.3 Remove the brake and place it on a level working
surface, with the mounting flange facing down.
4.3.4 Loosen the locknuts (18) ONE TURN AT A TIME and
in an alternating (crosswise) pattern until the spring
force is relieved. Remove the locknuts, washers (1
and wear spacers (if stored).
Caution
The locknuts (18) must be loosened gradually to
prevent damage to the brake components.
Caution
Refer to Table 9 for power head weights before
lifting the power head. Provide properly rated lifting
devices. Failure to use the properly sized and rated
lifting devices can cause equipment damage and
personal injury.
Note
The term 'power head' refers to the subassembly
consisting of the spring housing, cylinder, and
pressure plate.
4.3.5 Lift the cylinder, spring housing, and pressure plate
o of the studs as an assembly. Set the assembly
aside on a level working surface, with the cylinder
facing down.
Note
If a stud (6) should happen to come loose, remove it
completely and clean the threads on the stud and the
threads in the mounting flange. Apply Loctite Primer
Grade "T" to the stud Threads. After the threads
18 Airflex DBB 8110 Brake Assembly
®
4.3.6
4.3. 7
7)
4.3.8
4.3.9
4.3.10
E-CLCL-TT001-E December 2012
have dried, assemble to the mounting flange using
Loctite #262. The end of the stud must not extend
past the mounting surface on the mounting flange.
Caution
Loctite #262 must be shaken prior to application.
Caution
Loctite #262 may irritate sensitive skin. Refer to the
product label for safety precautions.
On multiple disc brakes, remove the reaction plate
(31), release springs (34), clamp tubes (12) and the
remaining disc(s)(58).
Inspect the brake components for wear or damage.
Replace as required. For wear limits of components,
see Table 7.
Remove the socket head screws and friction discs or
blocks and discard.
Note
It may be necessary to use heat to soften the Loctite
to ease screw removal. Use a pinpoint torch, heating
only the socket area of the screw.
Smooth the friction mounting surfaces of any burrs
or raised areas with a course, flat polishing stone,
and clean the tapped holes of any residual Loctite
or other contamination. Check screw fit and chase
the threads if necessary being sure to final clean the
tapped holes of any residual contamination.
Caution
Before installing screws, make sure that the screw
threads and threaded holes are clean to ensure that
the new screws will lock properly.
Position the new friction discs (friction blocks on the
50DBBS) on the mounting surfaces. Apply Loctite
#262 to the threads of the screws (5
torque the screws to 20 ft.-lb.
Caution
Loctite #262 must be shaken prior to application.
7), install and