Bendix PURAGUARD SYSTEM FILTER User Manual
®
Bendix® PuraGuard® System Filter
SD-08-187
DESCRIPTION
The PuraGuard® system filter is used to assist the
production of purified compressed air on high air use vehicles.
The PuraGuard® system filter consists of a filter element
mounted in a die cast aluminum housing. The sump
housing contains a drain valve for maintenance. For ease
of serviceability, all maintenance kits do not require removal
of the PuraGuard® system filter from its mounting on the
vehicle.
ONE SUPPLY & ONE DELIVERY PORT
(SEE ARROW SYMBOL ON PURAGUARD
SYSTEM FILTER TOP COVER FOR AIR FLOW)
MOUNTING
BRACKET
(2)
PURAGUARD
SYSTEM FILTER
®
®
HEAD
High air use vehicles (e.g. transit vehicles) may require the
air compressor to exceed its normal duty cycle. The resulting
high compressor discharge temperatures can allow oil
aerosols to pass through the air dryer, condensing
downstream in air system components.
The PuraGuard® system filter follows the air dryer in the system
and removes approximately 99% of oil aerosols. On vehicles
not using an air dryer, the PuraGuard® system filter follows
the supply (“wet tank”) reservoir (see Figures 3 & 4).
OPERATION
GENERAL (See Figure 2)
Compressed air passes through the supply port of the
PuraGuard® system 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 air travels back up from the
sump, through the PuraGuard® system filter delivery port
and into the air system.
DELIVERY
PORT
SUPPLY
PORT
SUMP
HOUSING
DRAIN VALVE
EXTERIOR
VIEW
TOP
VIEW
SUPPLY
PORT
FIGURE 1 - PURAGUARD® SYSTEM FILTER
DELIVERY
PORT
O-RING
FILTER
ELEMENT
SPRING
LOCATOR
FIGURE 2 - CUT-AWAY SHOWING AIR FLOW
FILTER
ELEMENT
HAS
O-RING
INCLUDED
SPRING
DRAIN
PORT
1
PuraGuard® System
Filter Installation System
with Air Dryer
Governor
Primary
Reservoir
Air
Compressor
FIGURE 3
Air Dryer
PuraGuard® System Filter
Installation System without
Governor
Air Dryer
Air
Compressor
FIGURE 4
The PuraGuard® system filter has two female pipe thread
air connections: one supply, one delivery — identified by
their relationship to the arrow symbol showing air flow on
the PuraGuard® system filter top cover (see Figure 1).
Note: The PuraGuard® system filter is not recommended
to be used in conjunction with an alcohol evaporator or
injector. The PuraGuard® system filter will remove the liquid
or aerosol alcohol introduced, defeat the purpose of the
evaporator/injector and require the sump to be drained more
often than normal.
PuraGuard
System Filter
®
Supply
Reservoir
System Filter
Supply
Reservoir
PuraGuard
Secondary
Reservoir
Primary
Reservoir
®
Secondary
Reservoir
2. Visually check for physical damage to the PuraGuard
system filter such as chaffed or broken air hoses and
broken or missing parts.
3. Check mounting bolts for tightness. Re-torque to vehicle
manufacturers guidelines.
4. Perform the Operation & Leakage Tests listed in this
publication.
®
FILTER BYPASS (refer to Figure 5)
If a situation occurs where the ability of the filter to allow air
to pass is impaired and causes a pressure difference of
approx. 20 p.s.i. between the air entering the filter element
and exiting, the filter will move downwards against the spring.
The air entering will then be able to bypass the filter element.
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, or 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.
FILTER
MOVES
DOWNWARDS
AGAINST
SPRING
FORCE
FIGURE 5 - PURAGUARD® SYSTEM FILTER BYPASS
2
FIGURE 6 - MAINTENANCE KITS AVAILABLE
800691
RETROFIT KIT
This kit contains the PuraGuard
®
system filter assembly, brackets, and
drain valve. Some other fittings, etc.
are typically required for installation.
ALL PARTS
SHOWN ARE
INCLUDED
IN KIT
5006788
MAINTENANCE KIT
INCLUDED
IN KIT
5006789
REBUILD KIT
INCLUDED
IN KIT
Every 3,600 operating hours, or 100,000 miles or one
(1) year:
1. With the air system pressure at 0 p.s.i., drain collected
contaminants for disposal.
2. Visually check for physical damage to the PuraGuard
system filter such as chaffed or broken air hoses and
broken or missing parts.
3. Replace the filter element (see Maintenance Kits
available, Figure 6).
4. Check mounting bolts for tightness. Re-torque to vehicle
manufacturers guidelines.
5. Perform the Operation & Leakage Tests listed in this
publication.
OPERATION & LEAKAGE TESTS
Build the air system to governor cutout. Shut off the engine.
Using a soap solution, check all lines 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.
REBUILDING THE PURAGUARD® SYSTEM
FILTER
GENERAL
If, after completing the routine operation and leakage tests,
it has been determined that one or more components of the
PuraGuard® system filter requires replacement or
maintenance, refer to Figure 7 to find the appropriate kit.
When rebuilding or replacing components of the PuraGuard
system filter use only genuine Bendix parts. For ease in
®
servicing, the PuraGuard® system filter has been designed
so that the maintenance kits can be installed without
removing the PuraGuard® system filter from the vehicle.
WARNING! PLEASE READ AND FOLLOW
THESE INSTRUCTIONS TO AVOID
PERSONAL INJURY OR DEATH:
When working on or around a vehicle, the following
general precautions should be observed at all times.
1. Park the vehicle on a level surface, apply the
parking brakes, and always block the wheels.
Always wear safety glasses.
2. Stop the engine and remove ignition key when
working under or around the vehicle. When
working in the engine compartment, the engine
should be shut off and the ignition key should be
removed. Where circumstances require that the
engine be in operation, EXTREME CAUTION should
be used to prevent personal injury resulting from
contact with moving, rotating, leaking, heated or
electrically charged components.
3. Do not attempt to install, remove, disassemble or
assemble a component until you have read and
thoroughly understand the recommended
®
3
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