SERVICE MANUAL
CLEANING AND INSPECTION
Wash all metal parts in cleaning solvent and dry
them. Inspect all parts for excessive wear or
deterioration. Inspect the valve seats for nicks or burrs.
Check the springs for cracks or corrosion. Replace all
rubber parts and any part not found to be serviceable
during inspection.
ASSEMBLY
Prior to reassembly of the SR-1 Spring Brake Valve,
lubricate all O-rings, O-ring grooves, piston bores and
metal-to-metal moving surfaces with the silicone base
lubricant packaged in the repair kit or Item 3 in
LUBRICANT SPECIFICATIONS.
The torque values listed in assembly procedure are
assembly torque values and can be expected to fall off
after assembly. Do not retorque after initial assembly
torques fall.
1.
Assemble check valve, valve spring guide and
valve spring and insert them in body.
2.
Apply a pipe sealant to the socket head pipe
plug and install it in body. Tighten to 15-19 Nm
(130-170 inch-pounds) of torque.
3.
Place inlet and exhaust valve assembly into
valve body.
4.
Install exhaust diaphragm in exhaust cover.
5.
Position exhaust cover on body and secure
cover with two Phillips screws. Tighten screws to
2.3-3.4 Nm (20-30 inch-pounds) of torque.
6.
Place inlet exhaust valve in body and install
valve spring and valve stop.
7.
Install O-ring on the cap nut and install the cap
nut in body. Tighten to 12-13 Nm (100125 inch-
pounds) of torque.
8.
Position small and large O-rings on small
diameter piston and insert piston in body.
9.
Install large and small O-rings on large diameter
piston and insert the piston in body.
10.
Position
piston
springs
in
their
respective
pistons.
11.
Secure cover to body using four 1/4" 20 Phillips
head screws and lockwashers. Tighten four
screws to 5.7-9 Nm (50-80 inch-pounds).
Be sure inversion valve is checked as outlined in
SERVICE CHECKS before chassis is returned to
service.
CTS-4079 - CHAPTER VII - Page 7
