Bendix Commercial Vehicle Systems PURAGUARD QC SYSTEM FILTER User Manual

®

Bendix® PuraGuard QC™ Oil Coalescing Filter

SD-08-187B

DESCRIPTION

The PuraGuard QC™ oil coalescing filter provides purified
compressed air on any air braked vehicle. It consists of a
spin-on housing, or cartridge, mounted to an aluminum body .
The spin-on cartridge contains a drain valve for maintenance.
For ease of serviceability, the spin-on cartridge can be
removed without disconnecting the supply and delivery lines
of the PuraGuard QC
on the vehicle.

ONE SUPPLY & ONE DELIVERY PORT
(SEE ARROW SYMBOL ON THE BODY

MOUNTING

BRACKET

™

oil coalescing filter from its mounting

FOR AIR FLOW)

PURAGUARD

BODY

Vehicles operate best with clean, dry compressed air . The
PuraGuard QC™ oil coalescing filter removes approximately
90% of oil aerosols and particulates down to 1 micron in
size, but it must be used in a system with and follow an air
dryer.

OPERATION

GENERAL (See Figure 2)

Compressed air passes through the supply port of the
PuraGuard QC™ oil coalescing filter and travels downward
through the center of the filter element. As the air passes
through the filter material, oil in liquid and aerosol form are
removed and collected in the sump. The PuraGuard QC
filter also collects solid particles 1 micron and larger . The
cleaned air travels back up from the sump, through the
delivery port and into the air system.

DELIVERY

PORT

™

SPIN-ON

CARTRIDGE

EXTERIOR

VIEW

TOP

VIEW

SUPPLY

PORT

FIGURE 1 - PURAGUARD QC™ OIL COALESCING FIL TER

1 SUP

DRAIN VALVE

2 DEL

DELIVERY

PORT

SUPPLY

PORT

SEAL

FILTER

SPRING

SPRING

LOCATOR

FIGURE 2 - CUT-A WAY SHOWING AIR FLOW

DRAIN

PORT

1

Governor

PuraGuard QC™ oil coalescing filter

Primary

Reservoir

Air

Compressor

Air Dryer

FIGURE 3 - PURAGUARD QC™ OIL COALESCING FIL TER INST ALLATION SYSTEM WITH AIR DRYER

The PuraGuard QC™ oil coalescing filter has two female

4. Perform the Operation & Leakage Tests listed in this
pipe thread air connections: one supply, one delivery —
identified by their relationship to the arrow symbol showing
air flow on the PuraGuard QC™ filter top (see Figure 1).

™

Note: The PuraGuard QC
used in conjunction

with an alcohol evaporator or injector. The

filter is not recommended to be

PuraGuard QC™ oil coalescing filter will remove the liquid or

Every 3,600 operating hours, 100,000 miles or one (1)
year:

1. With the air system pressure at 0 p.s.i., drain collected

2. Visually check for physical damage to the PuraGuard
aerosol alcohol introduced, defeating the purpose of the

evaporator/injector and requiring the sump to be drained more
often than normal.

3. Replace the cartridge (see Maintenance Kits, Figure

FIL TER BYP ASS (refer to Figure 4)

If a situation occurs where the ability of the filter to allow air
to pass is impaired and causes a pressure difference of
approximately 20 p.s.i. between the air entering the filter
element and exiting, the filter will move downward against

4. Check mounting bolts for tightness. Re-torque to 160-

5. Perform the Operation & Leakage Tests listed in this

Supply

Reservoir

publication.

contaminants for disposal.

QC™ filter such as chaffed or broken air hoses and
broken or missing parts.

5). Do not use the drain valve to remove the cartridge.

200 in-lbs.

publication.

the spring. The air entering will then be able to bypass the
filter element.

Secondary

Reservoir

PREVENTIVE MAINTENANCE

Important: Review the warranty policy before performing

any intrusive maintenance procedures. An extended warranty
may be voided if intrusive maintenance is performed during
this period.

Because no two vehicles operate under identical conditions,
maintenance intervals will vary . Experience is a valuable
guide in determining the best maintenance interval for a
vehicle.

Every 300 operating hours, 8,000 miles or one (1)
month:

1. With the air system pressure at 0 p.s.i., use the drain

valve to collect contaminants for disposal. Do not open
the valve beyond shoulder stop. This could loosen the
handle.

2. Visually check the PuraGuard QC™ filter for broken or

missing parts.

3. Check mounting bolts for tightness. Re-torque to vehicle

manufacturers guidelines.

FILTER MOVES

DOWNWARDS

AGAINST

SPRING

FORCE

SHOULDER

STOP

SPRING

FIGURE 4 - BYP ASS

2