Bendix Commercial Vehicle Systems PURAGUARD SYSTEM FILTER 7/04 User Manual

Page 6

CONNECTING THE AIR HOSES

Follow either Figure 4 or 5 for air hose arrangement.
1. The PuraGuard

system filter supply and delivery ports

are 1/2-14 NPT. Install minimum 1/2 inch inside diameter
air hoses. When installing an elbow fitting use the fitting
arrangement shown in Figure 9, using a high strength
nipple and then an elbow fitting.

2. Hoses must be installed without tight turns that might

cause air flow restrictions. Note: Check that the hose
attachment agrees with the air flow arrow symbol (see
Figure 1). The label may not be facing forward when
installation is complete.

OPERATIONAL TEST

Build the air system to governor cutout. Shut off the engine.
Using a soap solution, check all hoses and fittings leading
to and from the PuraGuard

system filter for leakage and

integrity. Repair any excessive leaks - exceeding a 1”
bubble in 5 seconds - before restoring vehicle to service.

MAINTENANCE KIT INSTALLATION

KIT DESCRIPTION

The kits available allow either a filter element replacement
or major overhaul of the Bendix

PuraGuard

system filter.

VEHICLE PREPARATION

1. Park the vehicle on a level surface and prevent movement

by means other than the brakes.

2. Drain all reservoirs to 0 p.s.i.
3. Drain the contents of the sump into a suitable container

for disposal and then re-close the drain valve.

4. Using detergent and water, clean the exterior of the

PuraGuard

system filter of road grime etc.

DISASSEMBLY AND CLEANING

(see Figure 11)

1. Unscrew the sump housing of the PuraGuard

system

filter. If necessary, use a strap wrench to assist this
process.

2. Remove and discard the filter and o-ring.
If only installing the maintenance kit, go to Inspection
section below.
3. Using long-nose pliers, carefully remove and discard

the spring and spring locator inside the sump housing.

4. Using detergent and water or other suitable solvent, clean

inside the sump housing.

INSPECTION

1. Inspect the PuraGuard

system filter for broken or

missing parts. Replace as necessary.

2. Inspect the drain valve for any build-up that could impair

its function. Clean as necessary.

ASSEMBLY

(see Figure 11)

1. Install the replacement o-ring into the channel in the

head of the PuraGuard

system filter.

FIGURE 11 - MAINTENANCE KIT COMPONENTS

FILTER

ELEMENT

LARGE

O-RING

SPRING

LOCATOR

PURAGUARD

SYSTEM FILTER

HEAD

SUMP

HOUSING

If only installing the maintenance kit, go to item 4 below.
2. Install the spring onto the spring locator.
3. Using long-nose pliers, install the spring locator and

spring assembly into the sump (see Figure 11).

4. Insert the replacement filter (guide lands uppermost)

into the sump with its base resting on the spring.

5. Coat the threads of the sump housing using barium or

lithium grease. Sufficient torque to install the sump will
be produced by turning the housing by hand until fully
hand-tight. Take care not to damage the large
o-ring when installing the sump housing.