Operation & Maintenance Instruction
Page 16 of 24
August, 2003
4225-50, S.6
7.6
DISASSEMBLY of ABDX-SS SERVICE PORTION
See Figures 13 & 14
7.6.1
Remove the release valve portion (54) from the body
(49) by first removing the three
3
/
8
" flanged hex nuts (52).
7.6.2
Remove and SCRAP the five
13
/
16
" O.D. ring gaskets
(56) and the
7
/
8
" O.D. ring gasket (55) from the mounting face
of the release valve portion (54). Remove the wire mesh
strainers (57) from the body (49).
7.6.3
Set the release valve portion (54) aside in a clean,
protected area for later disassembly.
7.6.4
Service Diaphragm Piston
7.6.5
Remove the top cover (2) from the body (49) by
removing the four
1
/
2
" x 1
3
/
4
" hex head screws (1).
7.6.6
Remove and SCRAP the 1
1
/
16
" O.D. ring gasket (3)
from the top cover (2).
7.6.7
Carefully remove the service piston assembly
(4 to 17) as a unit from the body (49).
7.6.8
Place the service piston assembly (4 to 17) on the
Service Piston Assembly fixture, Part No. 564522 as shown
in Figure 8. Hold the service piston assembly in position so
that the slide valve spring (13) rests on the fixture with the
seat of the slide valve (15) facing upward.
7.6.9
Using the driver pin that is furnished with the piston
holding fixture, carefully drift the
3
/
32
" x 1" cylindrical spring
pin (11) from the slide valve (15).
7.6.10 Remove the slide valve spring (12), slide valve (15),
graduating valve (14) and graduating valve spring (13) from
the service piston (16).
7.6.11 Remove the
5
/
8
" x 1" hex head cap screw (4) which
secures the diaphragm follower (5) and diaphragm (6) to the
service piston (17).
7.6.12 Remove the diaphragm follower (5) and diaphragm
(6) from the service piston (16). SCRAP the diaphragm (6).
7.6.13 Remove the spring seat retaining ring (7) from the
tail of the service piston (16), then remove the spring seat
(8), spring (9) and spring guide (10). Remove and SCRAP
the service piston rings (17) from the service piston (16).
7.6.14 Limiting Valve, Back Flow Check Valve
7.6.15 Remove the four
1
/
2
" x 1
1
/
4
" hex head screws (33)
which secure the bottom cover (44) to the body (49).
WARNING:
The bottom cover (44) is under spring load.
Exercise care so that no parts are inadvertently expelled
from the assembly. Inadvertently expelled parts may cause
bodily injury.
7.6.16 Remove the bottom cover (34) from the body (49).
7.6.17 Remove and SCRAP the
11
/
16
" O.D. ring gasket (38),
the 2" O.D. ring gasket (35) and the 2" flange fitting gasket
(39) from the cover (34).
7.6.18 Remove the check valve spring (36) and the check
valve (37) from the body (49). SCRAP the check valve (37).
7.6.19 Remove the brake cylinder limiting valve spring (42),
diaphragm follower (43) and the brake cylinder limiting valve
diaphragm (44) from the body (49).
7.6.20 Remove and SCRAP the o-rings (46 & 47) from the
brake cylinder limiting valve stem (45).
7.6.21 Remove the piston return spring (40) and the spring
cage (41) from the body (49).
7.6.22 Accelerated Service Release Valve
7.6.23 Remove the service accelerated release valve cover
(19), wear protection disk (20), and diaphragm/piston
assembly (21 to 24) as a unit from the filling piece (31) by
first removing the four
1
/
2
" x 2
3
/
4
" hex head screws (18).
7.6.24 Remove the service accelerated release valve piston/
diaphragm assembly (21 to 24) from the cover (19).
7.6.25 Using the Service Accelerated Release Valve Piston
Spanner Wrench, as shown in Figure 10, to hold the service
accelerated release valve piston (24), remove the
9
/
16
" hex
head nut (21), diaphragm follower (22) and the diaphragm
(23) from the threaded end of the piston (24). SCRAP the
diaphragm (23).
NOTE:
If required, use a flat bar placed in the slot to retain
the service accelerated release piston (24) while removing
the
9
/
16
hex head nut (21).
