3
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
procedures. Use only the proper tools and observe
all precautions pertaining to use of those tools.
4.
If the work is being performed on the vehicle’s air
brake system, or any auxiliary pressurized air
systems, make certain to drain the air pressure from
all reservoirs before beginning ANY work on the
vehicle. If the vehicle is equipped with an AD-IS
™
air dryer system or a dryer reservoir module, be
sure to drain the purge reservoir.
5.
Following the vehicle manufacturer’s
recommended procedures, deactivate the electrical
system in a manner that safely removes all
electrical power from the vehicle.
6.
Never exceed manufacturer’s recommended
pressures.
7.
Never connect or disconnect a hose or line
containing pressure; it may whip. Never remove a
component or plug unless you are certain all
system pressure has been depleted.
8.
Use only genuine Bendix
®
replacement parts,
components and kits. Replacement hardware,
tubing, hose, fittings, etc. must be of equivalent
size, type and strength as original equipment and
be designed specifically for such applications and
systems.
9.
Components with stripped threads or damaged
parts should be replaced rather than repaired. Do
not attempt repairs requiring machining or welding
unless specifically stated and approved by the
vehicle and component manufacturer.
10. Prior to returning the vehicle to service, make
certain all components and systems are restored
to their proper operating condition.
PREVENTIVE MAINTENANCE
Important: Review the Bendix Warranty Policy before
performing any intrusive maintenance procedures. A warranty
may be voided if intrusive maintenance is performed during
the warranty period.
No two vehicles operate under identical conditions, as a
result, maintenance intervals may vary. Experience is a
valuable guide in determining the best maintenance interval
for air brake system components. At a minimum, the QR-L
™
valve should be inspected every 12 months or 3600 operating
hours, whichever comes first, for proper operation. Should
the QR-L
™
valve not meet the elements of the operational
tests noted in this document, further investigation and service
of the valve may be required.
SERVICE CHECKS
1. Remove any accumulated contaminants. Visually
inspect the valve’s exterior for physical damage. Replace
the valve if excessive physical damage is noted.
2. Inspect all air lines connected to the valve for signs of
wear or physical damage. Repair or replace as
necessary.
OPERATIONAL AND LEAKAGE TESTS
1. Block the vehicle’s wheels and fully charge the air
system.
2. Apply and release air pressure rapidly to the QR-L
™
valve
several times and check for prompt response.
3. With air pressure applied to the supply port, apply a
soap solution to the QR-L
™
valve exhaust ports. Leakage
of a 1” bubble in 5 seconds is permissible.
4. With the brakes still applied to the supply port, apply a
soap solution around the valve where the cap and body
are joined. No leakage at this point is permitted.
If the valve does not function as described, or if leakage is
excessive, replace it at any authorized parts outlet.
REMOVAL
1. Identify and mark or label all air lines and their
connections to the QR-L
™
valve. Then disconnect the
air lines. Use the QR-L
™
valve wrench flat, closest to
the air line or fitting being removed.
2. Remove the QR-L
™
valve from the vehicle. Retain the
mounting hardware, if any.
INSTALLATION
1. Install the QR-L
™
valve on the vehicle using the mounting
hardware, if any, saved during removal.
2. Reconnect all air lines to the valve using the identification
made during removal. Note: An arrow embossed in the
body of the vale indicates the direction of air flow and
points toward the delivery port. Use the QR-L
™
valve
wrench flat, closest to the air line or fitting being installed.
3. Test all air fittings for excessive leakage and tighten as
needed. Perform OPERATIONAL AND LEAKAGE
TESTS before placing the vehicle back into service.
NOTE: The construction of the QR-L
™
valve prevents
disassembly/assembly. It is a non-serviceable device
and cannot be repaired. If the QR-L
™
valve does not
meet the operational and leakage tests, it must be
replaced. Replacements are available at any
authorized Bendix parts outlet.
