Airflex
®
DBB 8110 Brake Assembly
E-CLCL-TT001-E December 2012
20
4.4.6
Carefully examine the seal surfaces in the cylinder
(19). If the surfaces have worn to the point as
indicated on Table 7, the cylinder must be replaced.
4.4. 7
Lubricate the seal surfaces in the cylinder (19)
with Molykote
®
55M Grease and carefully slide the
cylinder onto the spring housing (16). Take special
care to avoid damaging the seal lips.
4.4.8
Attach the cylinder (19) to the pressure plate (14)
with the screws (20), washers (1
7) and spacer tubes
(27) removed in 4.4.2. Use Loctite Loc-Quic Primer
Grade “T” to clean and prepare the screw threads
and install with Loctite #262. Using a crosswise
pattern, torque the screws to the value shown on
Table 4.
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
Spring Replacement
4.5.1
Spring Replacement for 20 DBBS & 25 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.
4.5.1.1 Disconnect the air supply lines and loosen the
locknuts (18), ONE TURN AT A TIME and in a
crosswise pattern, until the spring force has been
relieved.
4.5.1.2 Match mark the pressure plate and spring housing to
one another.
4.5.1.3 Remove the locknuts (18) and washers (1
7) and
carefully remove the cylinder/spring housing/pressure
plate assembly. Transport to a clean work area.
Caution
The locknuts (18) must be loosened gradually to
prevent damage to the brake components.
4.5.1.4 Loosen the screws (20) gradually ONE TURN AT
A TIME, following a crosswise pattern until the
remaining spring force is relieved. Remove the
screws and washers (17).
4.5.1.5 Carefully lift the cylinder and spring housing off of the
pressure plate, exposing the springs (22).
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/pressure plate assembly.
Note
Before removing the old springs, make note of the
number used and the position that they are in so that
the new springs may be installed similarly for proper
brake functioning.
4.5.1.6 Noting their orientation, remove the spring retainer
plates (53), exposing the springs.
4.5.1. 7 Remove the springs and check the free height. If the
free height of any spring is less than the value shown
on Table 7, or any springs are cracked or broken, the
entire complement of springs must be replaced.
4.5.1.8 Re-install the springs into the pockets in the pressure
plate.
Caution
No spring retainer plate (53) should cross over the
ribs in the spring housing (16).
4.5.1.9 Place a spacer tube (2 7) in position over each tapped
hole in the pressure plate (14), align the match
marks and carefully lower the spring housing/cylinder
assembly onto the springs, making sure the springs
engage the bosses in the spring housing.
4.5.1.10 Clean the threads on the hex head screws (20) and
install the hex head screws and flat washers (1
7).
Using a crosswise pattern, tighten the screws one
turn at a time until the spacer tubes are clamped
between the cylinder and pressure plate.
4.5.1.11 Remove the hex head screws (20) one at a time.
Clean and prepare the screw threads and apply
Loctite LocQuic
®
Primer “T” to the screw threads.
DBBS Brakes
Summary of Contents for Airflex DBBS
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