SERVICE MANUAL
Fig. 9 Sectional View of E7 Brake Valve
1
STEM
2
NUT, Spring Seat
3
SPRING, Stem
4
GUIDE, Stem Spring
5
NUT, Lock
6
SEAT, Spring
7
RETAINER
8
PISTON, Primary
9
SPRING, Rubber
10
PISTON, Lower Static
11
SPRING, Primary Piston Return
12
BODY
13
PISTON, Relay
14
SPRING, Relay Piston Return
15
PISTON, Upper Static
16
VALVE, Secondary Inlet & Exhaust
17
RING, Retaining
18
VALVE, Primary Inlet & Exhaust
19
RING, Retaining
20
GROOVE, Locking
5.
Install O-rings on relay piston (13) and primary
piston (8).
6.
Position rubber spring (9), concave side down, in
primary piston (8) and place spring seat (6), flat
side up, over rubber spring.
7.
Install spring seat nut (2) on primary piston with
hex head closest to spring seat and rotate nut
clockwise until top surface of spring seat is even
with top surface of piston (8).
8.
Position relay piston spring (14), which is lighter
of the two piston return springs, relay piston (13),
primary piston spring (11) and primary piston (8)
in lower static piston (10). Compress both
primary and secondary pistons in lower static
piston. Hold them manually or mechanically.
A screwdriver may be used by inserting it through a
rectangular opening in static piston
into locking groove (20) in primary piston.
9.
Insert stem (1) through exhaust passage of relay
and primary pistons and engage a screwdriver
with slot in head of stem; then position stem
spring (3), spring guide (4) on spring seat nut
(2).
10.
Compress guide spring assembly and install lock
nut (5) on stem. Torque nut to 2.3 -3.4 N.m (20 -
30 in lbs).
Torque is a specified value for assembly;
after assembly, torque value will fall off.Do
not
retorque nut.
11.
Remove screwdriver from lower static piston
assembly.
CTS-4079 - CHAPTER Page 10
