Airflex
®
DBB 8110 Brake Assembly
E-CLCL-TT001-E December 2012
13
TABLE 7
Wear Limits for DBBS Components (Ref. Figs. 1 & 2 and Section 4.2)
Item
Description
Wear Limit
Remarks
Fully Worn at Bottom of
dust groove. See Figure #4.
Friction Material must also
be replaced if contaminated
Brake has adjustment provision
#8 Friction Disc
Friction Material
with oil or grease.
See Section 4.2
Wear will be in the form of
#14 Pressure Plate
elongation of the holes. Original
and
Maximum wear is
hole diameters are shown on the
#31 Reaction Plate
Reaction Holes
0.031 in. (0.80 mm)
table below
Maximum wear is
Wear will be in the form of notch or
#12 Clamp Tube
Reaction Area
0.015 in. (0.38mm)
step on the side of tube.
Maximum wear is
Wear will be in the form of notch or
#12Clamp Tube
Reaction Area
0.015 in. (0.38mm)
step on the side of tube.
Wear will be in the form of grooves
Maximum wear is
where the seals contact the
#19 Cylinder
Seal Area
0.005 in. (0.13mm)
cylinder wall.
Wear will be in the form of grooves
Maximum wear is
where the seals contact the
#19 Cylinder
Seal Area
0.005 in. (0.13mm)
cylinder wall.
Original free height shown on the
Maximum free height shown
table below. Springs must be
#22, 34, & 52 Spring
Spring Free Height
on the table below.
replaced on complete sets.
Backlash is measured at the pitch
diameter. Replace the disc and
Maximum total backlash is
gear together. If step is worn in
#28 & 58 Gear & Disc
Gear Backlash
0.060 in. (1,5mm).
gear, gear must be replaced.
Original thickness for sizes 20 and
Maximum wear is
25 is 1.00 in (25,4mm), for size 38
0.045 in. (1,12mm)
and 50 it is 1.25 in. (31, 75mm).
Friction Wear
per surface 0.090 in.
Wear will be in the form of circular
#58 Disc
Surfaces
(2,24mm) total
grooves on the iron surface.
Item Reference
Description
Element Size
20DBBS
25DBBS
38DBBS
50DBBS
Original Reaction Hole
14 & 31
Diameters in Pressure
1.34
1.69
2.06
2.38
Plate and Reaction Plate
(34,11)
(42,9)
(54,4)
(60,33)
Original Free Height
2.84
2.5 7
3.64
4.25
34
inch/(mm)
(72,1)
(65,3)
(92,4)
(108,0)
Minimum Free Height
2.65
2.40
3.40
4.12
inch/(mm)
(67,3)
(61,0)
(86,4)
(104, 7)
Original Free Height
4.56
5.18
6.65
9.00
22
inch/(mm)
(115,8)
(131,6)
(168,9)
(228,6)
Minimum Free Height
4.25
4.90
6.3 7
8.75
inch/(mm)
(108,0)
(125,5)
(161,8)
(222,3)
Original Free Height
n/a
5.23
6.78
n/a
52
inch/(mm)
n/a
(132,8)
(172,2)
n/a
Minimum Free Height
n/a
4.95
6.50
n/a
inch/(mm)
n/a
(125, 7)
(165,1)
n/a
DBBS Brakes
Summary of Contents for Airflex DBBS
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