SERVICE MANUAL
4.
Position valve and seal assembly (16) into
secondary valve body (21) such that valve seal
rests on exhaust seat in body.
5.
Install spring (20) over tube to rest on seal
retainer. Then place O-ring (19) over exhaust
valve body (12). Align exhaust valve body to
spring and push exhaust valve body firmly into
valve body (21) and hold to prevent the spring
from pushing the exhaust body out. Install the
retaining ring (18) into valve body (21) making
sure ring seats properly in groove.
6.
Install new O-ring (27) on new valve (29) and
seal assembly.
7.
Place seal retainer (8) over tube and around
valve seal.
8.
Place valve and seal assembly (29) into primary
valve body (4) so that valve seal rests on
exhaust seat in valve body.
9.
Install spring (20) over tube to rest on seal
retainer.
10.
Install new O-rings (10 and 17) on exhaust valve
body (9). Then align exhaust valve body to
spring and push exhaust valve body firmly into
primary valve body (4) and hold to prevent spring
from pushing exhaust body out. Install retaining
ring (26) making sure it seats properly.
11.
Install O-Ring (24) on secondary piston (23).
12.
Position spring (22) into secondary body (21);
then install piston (23) into body (21).
13.Position O-ring (11) on primary body (4) and
align valve body (4) with piston (23) and valve
body (21). Push the two valve bodies together
and align with original alignment marks. Install
four screws (28) and tighten to 5.7 - 6.8 N.m (50
- 60 in lbs) torque.
14.
Install shims (30) and reaction ring (6) into
primary piston (31) as shown in Fig. 10. Then
install spring (32) in piston (31). Place spring
retainer (1) on top of spring and apply force to
depress retainer beyond the retaining ring
groove. Be sure to support the piston (31) in a
fixture (press) so that exhaust seat "B" will not
be damaged and install retaining ring (2)
properly in primary piston. Check force required
to start movement of spring retainer away from
retaining ring (2). Use a hydraulic press to
support piston so that exhaust seat "B" will not
be damaged. Then press spring retainer and
record pressure required to move retainer.
If force is less than 218 N (49 lbs), disassemble piston
assembly,
add
required
number
of
shims
and
reassemble. If force is more than 258 N (58 lbs),
disassemble piston assembly, remove required number
of shims and reassemble.
15.
Install O-ring (5) onto primary piston (31). Place
spring (7) into primary valve body (4). Align
piston to spring and push piston (31) firmly into
valve body (4) and hold to prevent spring from
pushing piston out. Install retaining ring (3)
making sure it seats properly in valve body.
16.
Test rebuilt brake valve by performing operation
and leakage tests as outlined in SERVICE
CHECKS.
CTS-4079 - CHAPTER IV - Page 15
