BENDIX TP-3DC TRACTOR PROTECTION VALVE Manual - Página 6

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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

components and kits. Replacement hardware,

tubing, hose, ﬁ ttings, etc. must be of equivalent

size, type and strength as original equipment and

be designed speciﬁ cally 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 speciﬁ cally 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.

11. For vehicles with Antilock Traction Control (ATC),

the ATC function must be disabled (ATC indicator

lamp should be ON) prior to performing any vehicle

maintenance where one or more wheels on a drive

axle are lifted off the ground and moving.

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

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TP-3DC

valve should be inspected every 6 months or

1500 operating hours, whichever comes ﬁ rst, for proper

operation. Should the TP-3DC

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 valves exterior for cracks, gouges, or other

physical damage. Replace the valve if physical damage

is excessive.

replacement parts,

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valve not meet the

2. Inspect all air lines connected to the valve for signs

of wear or physical damage. Repair/replace as

necessary.

3. Test air line ﬁ ttings for excessive leakage and tighten

or replace as necessary.

OPERATIONAL AND LEAKAGE TESTS

1. Block the vehicles wheels and fully charge the air

system.

2. Place the trailer supply valve in the emergency

position.

3. Disconnect the trailer control line hose coupling. Then

make a service application with either the foot valve or

the trailer control valve and check for leakage at the

hose coupling with a soap solution. Leakage should

not exceed a 1" bubble in 5 seconds (100 SCCM).

4. Release the service application and place the trailer

supply valve in the normal or run position. Connect the

trailer control valve to a test gauge.

5. Make a service brake application and note that service

air pressure is present at the trailer control line hose

coupling.

6. With the ignition on, make and hold a service brake

application and note that the stop lights function.

7. Remove the line at the TP-3DC

control port (TRAC CONT) and plug the end of the line.

Then make a service brake application and check for

leakage at the open tractor control port. Leakage should

not exceed a 1" bubble in 5 seconds (100 SCCM).

8. Reconnect the line to the primary tractor control port,

then disconnect and plug the line at the secondary

tractor control port (TRACT CONT). Then make a

service brake application and check for leakage at the

open tractor control port. Leakage should not exceed

a 1" bubble in 5 seconds (100 SCCM).

If the valve does not function as described; or if leakage is

excessive, repair the valve or replace it at any authorized

parts outlet.

REMOVAL

1. Identify and mark or label all air lines and their

connections to the TP-3DC

the air lines.

2. Remove the TP-3DC

the mounting hardware.

INSTALLATION

1. Install the TP-3DC

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mounting hardware saved during removal.

2. Reconnect all air lines to the valve using the identiﬁ cation

made during removal.

3. Test all air ﬁ ttings for excessive leakage and tighten as

needed. Also, perform OPERATIONAL AND LEAKAGE

TESTS before placing the vehicle back into service.

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valve primary tractor

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valve. Then disconnect

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valve from the vehicle. Retain

valve on the vehicle using the