Danfoss Airflex DBBS Installation, Operation And Maintenance Manual page 13

DBBS Brakes
TABLE 7
Wear Limits for DBBS Components (Ref. Figs. 1 & 2 and Section 4.2)
Item
#8 Friction Disc
#14 Pressure Plate
and
#31 Reaction Plate
#12 Clamp Tube
#12Clamp Tube
#19 Cylinder
#19 Cylinder
#22, 34, & 52 Spring
#28 & 58 Gear & Disc
#58 Disc
Item Reference Description
Original Reaction Hole
14 & 31 Diameters in Pressure
Plate and Reaction Plate
Original Free Height
inch/(mm)
34
Minimum Free Height
inch/(mm)
Original Free Height
inch/(mm)
22
Minimum Free Height
inch/(mm)
Original Free Height
inch/(mm)
52
Minimum Free Height
inch/(mm)
Description
Friction Material
Reaction Holes
Reaction Area
Reaction Area
Seal Area
Seal Area
Spring Free Height
Gear Backlash
Friction Wear
Surfaces
Wear Limit
Fully Worn at Bottom of
dust groove. See Figure #4.
Friction Material must also
be replaced if contaminated
with oil or grease.
Maximum wear is
0.031 in. (0.80 mm)
Maximum wear is
0.015 in. (0.38mm)
Maximum wear is
0.015 in. (0.38mm)
Maximum wear is
0.005 in. (0.13mm)
Maximum wear is
0.005 in. (0.13mm)
Maximum free height shown
on the table below.
Maximum total backlash is
0.060 in. (1,5mm).
Maximum wear is
0.045 in. (1,12mm)
per surface 0.090 in.
(2,24mm) total
Element Size
20DBBS 25DBBS
1.34 1.69
(34,11) (42,9)
2.84 2.5 7
(72,1) (65,3)
2.65 2.40
(67,3) (61,0)
4.56 5.18
(115,8) (131,6)
4.25 4.90
(108,0) (125,5)
n/a 5.23
n/a (132,8)
n/a 4.95
n/a (125, 7)
Airflex DBB 8110 Brake Assembly
®
Remarks
Brake has adjustment provision
See Section 4.2
Wear will be in the form of
elongation of the holes. Original
hole diameters are shown on the
table below
Wear will be in the form of notch or
step on the side of tube.
Wear will be in the form of notch or
step on the side of tube.
Wear will be in the form of grooves
where the seals contact the
cylinder wall.
Wear will be in the form of grooves
where the seals contact the
cylinder wall.
Original free height shown on the
table below. Springs must be
replaced on complete sets.
Backlash is measured at the pitch
diameter. Replace the disc and
gear together. If step is worn in
gear, gear must be replaced.
Original thickness for sizes 20 and
25 is 1.00 in (25,4mm), for size 38
and 50 it is 1.25 in. (31, 75mm).
Wear will be in the form of circular
grooves on the iron surface.
38DBBS 50DBBS
2.06 2.38
(54,4) (60,33)
3.64 4.25
(92,4) (108,0)
3.40 4.12
(86,4) (104, 7)
6.65 9.00
(168,9) (228,6)
6.3 7 8. 75
(161,8) (222,3)
6. 78 n/a
(172,2) n/a
6.50 n/a
(165,1) n/a
E-CLCL-TT001-E December 2012 13