2
FIGURE 1 - TWO COMPARTMENT RESERVOIR WITH CHECK VALVE
c. Momentarily open drain device on # 2 compartment.
Do not completely drain #2 Compartment.
5. Apply a soap solution to the drain ferrule #1
compartment. A slight bubble leakage is permitted.
If #2 compartment fails to hold air pressure or if excessive
leakage is evident at the drain ferrule of #1 compartment,
the check valve should be inspected for serviceability and
its parts replaced if necessary.
DISASSEMBLY
GENERAL
There are two types of two-compartment reservoir check
valves and they are;
1. The old ball style check with a removable seat and a
seat spring (see Figure 2).
2. The new flat style that has a non-removable stainless
steel seat (see Figure 3).
Both types of check valves are located in a housing (large
ferrule) with a cap nut cover. They are generally located on
top of the reservoir shell.
DISASSEMBLY OF THE BALL STYLE CHECK
VALVE (FIGURE 2)
Block and hold vehicle by means other than air brakes.
Completely drain compartments #1 and #2. Remove cap
nut and cap nut o-ring. Remove check valve and check valve
spring. Remove seat spring. With a hook or similar device,
carefully remove the check valve seat and its
o-ring so as not to mar or scratch it.
DISASSEMBLY OF THE FLAT STYLE CHECK
VALVE (FIGURE 3)
Block and hold vehicle by means other than air brakes.
Completely drain compartments #1 and #2.
Remove cap nut and cap nut o-ring.
Remove valve spring.
Remove valve and valve guide.
CLEANING AND INSPECTION
Wash all metal parts in a good cleaning solvent and dry
them thoroughly. All rubber parts should be wiped clean.
Inspect springs for distortion, corrosion, and cracks. Inspect
valves and valve seats for nicks, cuts and burrs. Inspect all
rubber parts for swelling and deterioration. Replace or repair
as necessary.
CAP NUT
CAP NUT
GROOVE IN
CAP NUT
O-RING
VALVE
SPRING
GUIDE
CHECK
VALVE
VALVE
SPRING
O-RING
SEAT SPRING
CHECK VALVE
O-RING
SEAT
SERVICE EACH 50,000 MILES
OR EVERY 6 MONTHS WITH:
FIELD MAINTENANCE KIT 282350
CONSISTING OF:
1 - CHECK VALVE
1 - GUIDE
1 - SPRING
1 - O-RING
COMPARTMENT 1
COMPARTMENT 2
FIGURE 3
FIGURE 2
