Filter bypass, Preventive maintenance, Puraguard – Bendix Commercial Vehicle Systems PURAGUARD SYSTEM FILTER 7/04 User Manual
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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.
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.
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.
FIGURE 5 - PURAGUARD
®
SYSTEM FILTER BYPASS
FILTER
MOVES
DOWNWARDS
AGAINST
SPRING
FORCE
PuraGuard
®
System
Filter Installation System
with Air Dryer
PuraGuard
®
System Filter
Installation System without
Air Dryer
FIGURE 4
FIGURE 3
PuraGuard
®
System Filter
Air Dryer
Governor
Air
Compressor
Supply
Reservoir
Primary
Reservoir
Secondary
Reservoir
Supply
Reservoir
Primary
Reservoir
Secondary
Reservoir
Air
Compressor
Governor
PuraGuard
®
System Filter