second. If leakage exceeds this measure,
remove and re-install the desiccant
cartridge.
Haldex PURest
1
NOTE: The PURest cartridge contains both the
desiccant and filter in one piece.
1. Park the vehicle on a level surface, shut down
the engine, and set the parking brake. Chock the
tires.
2. Remove the four mounting bolts and discard.
See
Fig. 1. Lift the canister about 1/2 inch and
remove.
3. Place the assembly upside-down as shown in
Fig. 2. Press the cartridge down to compress the
rubber spring then rotate counterclockwise 45
degrees to release the cartridge. The cartridge
itself contains no hazardous material, but there
may be a small amount of oil from the
compressor.
4. Clean the inside of the canister and aluminum
housing.
5. Remove the cartridge O-ring and discard.
6. Remove the new cartridge from the kit and make
certain the rubber spring is attached. See
Fig. 3.
7. Install the new cartridge into the canister. Align
the slots on the cartridge with the dimplets inside
the canister. Press the cartridge into the canister
and rotate clockwise 45 degrees to engage the
cartridge, as shown in
Fig. 4.
8. Place a new O-ring on the aluminum housing.
9. Place the cartridge assembly on the air dryer
housing and install four new mounting bolts. Use
an alternating diagonal pattern and tighten the
bolts 35 to 40 lbf·ft (47 to 54 N·m).
10. Before placing the vehicle in service, perform the
test below.
10.1 Start the engine and build air pressure to
100 psi (690 kPa) and shut-off the en-
gine.
10.2 Check for air leaks at the inlet, outlet, and
canister assembly. Correct any leakage
problem.
10.3 Restart the engine and build-up pressure
to cut-out pressure. At cut-out pressure,
the air dryer purge valve opens and im-
mediately expels a large volume of air,
followed by a slow flow of air lasting ap-
proximately 30 seconds.
WABCO System Saver 1200
Plus
NOTICE
The WABCO System Saver air dryers can use ei-
ther a standard or oil coalescing desiccant car-
tridge. When replacing the desiccant cartridge, it
is very important to use the same type of car-
1
Information in this section is provided by Haldex and is used with permis-
sion.
01/07/2011 f422526
1
2
3
1. O-ring
2. Cartridge
3. Mounting Bolts
Fig. 1, PURest Air Dryer Assembly
Brakes42
Recreational Vehicle Chassis Maintenance Manual, July 201842/4
To Next Page
Loading...
