Danfoss Airflex DBBS Installation, Operation And Maintenance Manual page 21

DBBS Brakes
Apply Loctite #262 to the screw threads and reinstall
the hex head screw. Immediately torque the hex
head screw to the value shown on Table 4.
Note
When removing and reinstalling the hex head screw
(20), spray the cleaned bolt threads with Locquic
Primer "T". Let parts dry and then apply Loctite #262
on the same surface. Install the hex head screw and
immediately torque as stated in 4.5.2.11.
Warning
Loctite #262 may cure prior to properly tightening the
hex head screw (20) if not tightened to the proper
torque value immediately after installation.
Caution
Loctite #262 must be shaken prior to application.
Caution
Loctite #262 may irritate sensitive skin. Refer to the
product label for safety precautions.
4.5.1.12 Hoist the cylinder/spring housing/pressure plate
subassembly into position and align the holes in the
spring housing with the studs and slide the assembly
until it is positioned against the face of the disc.
Assembly a flat washer and locknut on each stud,
tightening until it just begins to make contact with
the spring housing.
4.5.1.13 While supporting the weight of the cylinder/spring
housing/pressure plate assembly, tighten the
locknuts, ONE TURN AT A TIME and in a crosswise
pattern, until the spring housing is seated against the
clamp tubes. Torque the locknuts to the appropriate
value. See Table 4.
Caution
The locknuts (18) must be tightened gradually to
prevent damage to the brake components.
4.5.2 Spring Replacement for 38 DBBS & 50 DBBS
Brakes
Warning
Make sure that the machinery and related loads
are properly secured or supported to prevent shaft
rotation prior to releasing, removing or performing
maintenance on the DBBS brake assembly.
4.5.2.1 Disconnect the air supply lines from the brake.
4.5.2.2 Remove the fasteners that secure the brake and
support brackets (if applicable) to the mounting
structure
4.5.2.3 Using soft slings, rig the brake and slide the brake o
of the gear. Avoid placing slings or straps directly on
the release springs (34).
4.5.2.4 Transport the brake to a clean working area and
position the assembly on a flat surface with the
mounting flange (2) facing down.
4.5.2.5 Wipe the brake clean of oils, dirt and grease or other
contamination.
4.5.2.6 Match-mark the mounting flange (2), reaction plate(s)
(31), pressure plate (14), spring housing (16) and
cylinder (19) to one another prior to disassembly
to adequately show the proper orientation of
components to one another.
4.5.2. 7 With the brake still fully assembled and the cylinder
(19) facing up, loosen the hex head screws (20) ONE
TURN AT A TIME, following a crosswise sequence.
Remove the hex head screws and washers (1
Caution
Failure to loosen the screws (20) evenly and in small
increments as described may cause the screws or
cylinder (19) to bind.
4.5.2.8 Loosen the locknuts (18) –ONE TURN AT A TIME-
and in sequence until the spring force is relieved.
4.5.2.9 Carefully lift the spring housing (16) and cylinder (19)
subassembly o of the studs to expose the springs
(22) (52) and spring retainers (53). Note the locations
of the springs and spring retainers for reassembly
purposes.
Note
If the cylinder (20) is removed from the spring
housing (16), refer to Section 4.4 for inspection of the
seals, replacement (if necessary) and reassembly of
the cylinder/spring housing assembly.
Caution
Before removing the old springs (22) (52), make note
of the number used and the position that they are in
Airflex DBB 8110 Brake Assembly E-CLCL-TT001-E
®
7).
December 2012 21