Bendix Commercial Vehicle Systems TW-6 CONTROL VALVES 3/04 - Manual (Page 3)

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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.
REMOVAL
Disconnect all air lines and remove the valve.
INSTALLATION
Place the valve handle through appropriate hole in the panel,
place the dial (if used) over handle and install the mounting
screws. Connect the air lines. Apply air pressure and check/
repair air leaks.
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 TW
valves should be inspected every 6 months or 1500 operating
hours, whichever comes first, for proper operation. Should
the TW valves not meet the elements of the operational tests
noted in this document, further investigation and service of
the valve may be required.
DISASSEMBLY
Remove the operating handle or lever by driving the pin out
of the body and remove the lever, plunger and plunger spring.
Remove the o-ring seal from the plunger.
Remove the supply cap nut, inlet valve and spring. Remove
the o-ring from the supply cap nut.
CLEANING AND INSPECTION OF PARTS
Wipe all rubber parts clean. Clean the plastic and metal
parts in mineral spirits and dry thoroughly. Inspect all rubber
parts for wear or deterioration and replace where necessary.
Examine the inlet seat in the body if nicked or corroded.
Inspect all springs for cracks, distortion or corrosion and
replace if necessary.
ASSEMBLY
Prior to assembly lubricate the body bore, plunger, plunger
dome, o-rings, lever cam, lever pin, and cap nut threads
with Bendix barium base grease part number 246671.
1) Place inlet valve in body.
2) Place inlet valve spring on inlet valve.
3) Place o-ring on cap nut and install cap nut.
4) Install plunger spring into top of body.
5) Install o-ring seal on plunger and install plunger.
TW-1 ™ , TW-3 ™ & TW-6 ™ CONTROL VALVES
Depress the plunger, place lever cam in slot in body, line up
holes in body with hole in lever and insert the pin. Support
the body and drive the pin in fully.
TW-4 ™ & TW-5 ™ CONTROL VALVES
Depress the plunger with button until hole in plunger lines
up with holes in body. Insert the pin, support body and drive
the pin in fully.
LEAKAGE TEST
Test the valve per instructions in the Service Checks section
of this document.