Operation & Maintenance Instruction
Page 18 of 24
August, 2003
4225-50, S.6
7.6.26 Remove the service portion filling piece, plunger,
check valve assembly, and mounting gasket (25 to 32) as a
unit from the body (49).
7.6.75 Remove and SCRAP the filling piece mounting
gasket (32).
7.6.28 Compress and remove the spring seat (28), check
valve spring (29), and accelerated release check valve (30)
from the filling piece (31). SCRAP the check valve (30).
7.6.29 Remove the service accelerated release valve plunger
with o-ring (25, 26) by pushing it out of the cover end of the
filling piece (31). Remove and SCRAP the
1
/
4
" O.D. o-ring
(26) from the end of the plunger (25).
7.6.30 Remove and SCRAP the
11
/
16
" O.D. ring gasket (27)
from its groove in the filling piece.
7.6.31 Retrieve the release valve portion (54) which was
previously set aside in a clean, protected area.
7.6.32 Disassembly of Release Valve Portion
See Figure 14
7.6.33 Remove the five
3
/
8
" x 1
1
/
2
" hex head screws (1) which
secure the top cover (2) of the release valve portion to the
release valve body (35).
7.6.34 Remove the top cover (2) from the body (35).
7.6.35 Remove and SCRAP the two 1" O.D. ring gaskets
(3) from their grooves in the top cover (2).
7.6.36 Remove the two check valve springs (12), the
auxiliary and emergency reservoir check valves (13) and the
two check valve plungers (14) from the body (35). SCRAP
the two check valves (13).
7.6.37 Remove the spool valve spring (4) from the body (35).
7.6.38 Remove the spool valve - diaphragm follower -
diaphragm assembly (5 to 11) from the body (35) as a unit.
7.6.39 Remove and SCRAP the three
3
/
4
" O.D. o-rings (11)
from their grooves on the spool valve (10).
7.6.40 Using an open end wrench to hold the spool valve
(10), remove the
3
/
8
" self-locking nut (5), diaphragm follower
(6), diaphragm (7) and the piston with o-ring (8, 9) from
the threaded end of the spool valve (10). Remove the
1
/
2
"
O.D. o-ring (9) from its groove in the piston (8). SCRAP
the o-ring (9), diaphragm (7) and the self-locking nut (5).
7.6.41 Remove and SCRAP the
3
/
16
" x 2" cotter pin (24)
which secures the release valve stem guard (25) to the stem
and end plate (27). Remove the stem guard (25).
WARNING:
The bottom cover (31) is under spring load.
Exercise care so that no parts are inadvertently expelled
from the assembly. Accidently expelled parts may cause
bodily injury.
7.6.42 Remove the five
3
/
8
" x 1
3
/
4
" hex head cap screws
(15) that secure the bottom cover, valve seal, exhaust seal
stem, and end plate assembly (27 to 33) to the body (35).
Remove the cover assembly from the body (35).
7.6.43 Remove the stem and end plate (27), bottom cover
gasket (28), seal (30) and
5
/
8
" O.D. ring gasket (29) from the
cover (31). SCRAP the gaskets (28, 29) and seal (30).
7.6.44 Remove the lifter (26) and lifter spring (23) from the
body (35).
7.6.45 Remove the bottom cover sleeve (34) from the bottom
cover (31).
7.6.46 Cut off the head of the
3
/
16
" x
1
/
2
" aluminum pop rivet
(33) and remove the rivet (33) and seal (32) from the bottom
cover (31). SCRAP the rivet (33) and seal (32).
7.6.47 Remove the retaining check valve (20) and its spring
(19) from the body (35). SCRAP the check valve (20).
7.6.48 Remove the reset check valve spring (22) and the
reset check valve (21) from the body (35). SCRAP the check
valve (21).
7.6.49 Remove the reset spool valve with o-ring assembly
(18, 17) and the reset spool valve spring (16) from the
body (35).
7.6.50 Remove and SCRAP the three
3
/
4
" O.D. o-rings (17)
from the reset spool valve (18).
