SERVICE MANUAL
17.
Install seal ring (12) in lower body and secure
lower body to upper body using four hex head
capscrews and lockwashers; torque capscrews
to 7.9 - 11.3 N.m (70 - 100 in lbs).
18.
Install treadle assembly to basic brake valve
using three 5/16-18 hex head capscrews and
lockwashers; torque to 9 - 11.3 N.m (80 -100 in
lbs).
19.
Test the rebuilt E6 dual brake valve by
performing operation and leakage tests out-
lined in SERVICE CHECKS.
DISASSEMBLY
Suspended Pedal Type Valve (17))
Refer to Fig. 9 for numbers in parenthesis.
1.
Remove three capscrews and pedal assembly.
2.
Apply force on retainer, disengage locking tabs
from body and remove retainer (7).
3.
Grasp lock nut (5) of lower static piston
assembly (10) with pliers and pull piston
assembly from body (12).
4.
Fasten a hook from a 152 mm (6") piece of .125
mm (1/8") diameter wire (approx.), bending one
end 90 degrees at a length 12.7 to 19.mm (1/2"
to 3/4") from end of wire. Insert hook end in
bore of body and through secondary inlet valve
exhaust bore hooking onto valve. Pull firmly and
remove upper static piston (15) assembly with
secondary inlet and exhaust valve (16).
5.
Apply firm pressure on spring seat (6) which will
compress primary piston spring (11). Locking
groove (20) in piston is now accessible through
rectangular opening in body. Insert wire on
screwdriver into locking groove, thus holding
primary
piston
spring
(11)
in
compressed
position.
6.
Insert blade of screwdriver through exhaust
passage of secondary and primary pistons and
into slot of stem (1). Back off locking nut (5).
7.
Remove locking nut (5), spring stem guide (4)
and stem spring (3).
8.
Remove spring seat nut (2), spring seat (6) and
rubber spring (9) using same type procedure as
item 6.
9.
Removal of screwdriver or wire from locking
groove will permit spring load to push out
primary piston (8) and relay piston (13).
Care should be used when removing tool from locking
ring because of spring load.
10.
Remove primary piston (8) and return spring
(11), and relay piston (13) and return spring (14).
11.
Remove stem (1) and O-rings from relay and
primary pistons.
12.
Remove O-rings from upper static piston (15)
and lower static piston (10).
13.
Remove large retaining ring (17) from lower
static piston and remove primary inlet/exhaust
valve assembly (18). Disassembly of inlet and
exhaust valve is not required since it is only
serviced as an assembly.
14.
Remove large retaining ring (19) from upper
static
piston
assembly
(15)
and
remove
secondary inlet/exhaust valve assembly (16).
CLEANING AND INSPECTION
Wash all metal parts in cleaning solvent and dry them.
Inspect all parts for excessive wear or deterioration.
Inspect valve seats for nicks or burrs. Check springs for
cracks or corrosion. Replace all rubber parts and any
part not considered
REASSEMBLY
Suspended Pedal Type Valve (17)
Before starting to reassemble brake valve lubricate all O-
rings, O-ring grooves, piston bores and metal moving
parts with Item 1 in LUBRICANT SPECIFICATIONS.
Refer to Fig. 9 for numbers in parenthesis.
1.
Install
new
secondary
inlet/exhaust
valve
assembly (16) in upper static piston (15) and
secure with retainer ring (19) making certain
retaining ring is engaged in groove of upper
static piston bore.
2.
Install O-ring on upper static piston assembly
and install in body of valve.
3.
Install primary inlet/exhaust valve assembly (18)
in lower static piston (10) and secure with
retainer ring (17) making certain retaining ring is
engaged in goove in lower static piston (10).
4.
Install three O-rings in grooves of lower static
piston assembly (10). The larger diameter O-ring
is installed in groove nearest to bottom of piston
assembly.
CTS-4079 - CHAPTER IV - Page 9
