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
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