BENDIX TP-3 TRACTOR PROTECTION VALVE User manual

SD-03-3652

Bendix®TP-3™Tractor Protection Valve

FIGURE 1

DESCRIPTION

TheTP-3™(SeeFigure1)tractorprotectionvalveisusedin

combination with the PP-3™trailer supply valve on pre-121

tractors and the PP-7™trailer supply valve on post-121

tractors. It contains a passage for trailer supply air and a

servicelineshutoffvalve.Itisnormally mounted behind the

cab with the delivery line from the trailer supply valve

connected into the tractor emergency port and a delivery

line from the brake valve connected to the tractor service

port. The trailer supply and service hoses are mounted in

theirrespectiveportsintheTP-3™valve.(SeeFigure2)

OPERATION

Air from the trailer supply valve passes through the

emergency ports of the TP-3™valve to supply the trailer air

system and simultaneously exerts pressure on the end of

theplunger(3).Figure3.TP-3™valvesmanufacturedpriorto

June 1970 required approximately 80 psi on the plunger to

opentheinletvalve(4)(SeeFigure4)whichopenstheservice

lineshutoffline.ValvesmanufacturedafterJune1970require

approximately 45 psi to open the inlet valve. (Modification

kit265066 isavailableto modifyoldrevision TP-3™valvesto

the later revision 45 psi opening. Field maintenance kit

280858 contains the parts necessary to service both old

andnew).

Whenever the pressure from the trailer supply valve drops

below45psitheTP-3™valvewillclosetheservicelineshut-off

valve.

PREVENTIVE MAINTENANCE

Important: Review the Bendix Warranty Policy before

performinganyintrusivemaintenanceprocedures.Awarranty

maybe voided if intrusive maintenance is performedduring

thewarranty period.

TRACTOR

EMERGENCY

PORT

TRAILER

SERVICE

PORT

TRAILER

EMERGENCY

PORT

TRACTOR

SERVICE

PORT

OLD REVISION TYPE TP-3™

TRACTOR PROTECTION VALVE

OPENING PRESSURE

APPROXIMATELY 80 PSI

O-RING (7)

RETAINING RING (1)

DIAPHRAGM

SEAT (9)

WASHER(8)

PRELOAD

SPRING (2)

DIAPHRAGM(5)

VALVESPRING(6)

CAPSCREW(3)

INLETVALVE(4)

O-RING (13)

VALVE(4)

RETAINING

RING (1)

O-RING (7)

SEAT

O-RING (12)

VALVE

RETAINER (10)

PLUNGER (3)

CAPSCREW(3)

WASHER(8)

DIAPHRAGM(5)

DIAPHRAGM

SEAT (9)

SPRING (6)

NEW REVISION TYPE TP-3™

TRACTOR PROTECTION VALVE

OPENING PRESSURE

APPROXIMATELY 45 PSI

RETAINING

RING (14)

EXTERIORVIEW

FIGURE 2

TRAILER

SERVICELINE

TRAILER

EMERGENCY

LINE

TP-3™

TRACTOR

PROTECTION

VALVE

NO.2

RESERVOIR

BRAKE

VALVE

NO.1

RESERVOIR

DOUBLE

CHECK

COMPRESSOR

PP-3™

CONTROL

VALVE

No two vehicles operate under identical conditions; as a

result, maintenance intervals may vary. Experience is a

valuableguide indeterminingthebest maintenanceinterval

forairbrake system components.At a minimum, theTP-3™

valveshouldbeinspected every6 monthsor1500operating

hours, whichever comes first, for proper operation. Should

the TP-3™valve not meet the elements of the operational

testsnotedinthisdocument,furtherinvestigationandservice

ofthe valve may berequired.

OPERATING AND LEAKAGE CHECKS

1. Block and/or hold the vehicle by a means other than air

brakesduringthesetests.Placethe trailer supply valve

in the emergency position and disconnect the trailer

supply and service couplings.

2. Withtractorreservoirschargedtoatleast100psimake

and hold a full service brake application. Leakage at

either tractor hose coupling should not exceed a 1"

bubble in 5 seconds (100 SCCM).

3. Connect the trailer supply or emergency line hose

coupling and place the trailer supply valve in the “run”

position. Leakage at the “service” coupling should not

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

4. Connect the service coupling and make and hold a full

service brake application: Leakage at the diaphragm

endofthe TP-3™valveshallnot exceed a 1" bubble in 3

seconds(175SCCM).

NOTE: If theTP-3™valvedoes not functionasdescribed or

if leakage is excessive, it is recommended that it

bereturned to the nearest authorized Bendixparts

outletfor factory rebuilt valve. If this isnotpossible,

thevalveshould be repaired using genuine Bendix

parts, in which case the following should prove

helpful.

REMOVING

Remove trailer hose assemblies from the TP-3™valve.

Disconnect tractor service and supply lines and remove

theTP-3™valve.

INSTALLING

Wheninstalling the TP-3™valve,refer to Figure 2 forproper

connectionsalongwith the following explanation.

1. The delivery line from the trailer supply valve (PP-3™or

PP-7™) is connected to the tractor emergency port of

theTP-3™valve.

2. The delivery line from the brake valve (or double check

valve)isconnectedtothetractorserviceportoftheTP-3™

valve.

3. Trailer hose assemblies are installed in the trailer

emergencyandtrailer service ports of the TP-3™valve.

TC-2™

CONTROL VALVE

DISASSEMBLY

EARLY REVISION 80 PSI OPENING PRESSURE

(Figure 1)

1. Removeinsertretainerring(1)Figure4withTruarcpliers.

2. Removeinsertassembly.

3. Place insert on smooth surface with plunger down.

4. Press down on exhaust diaphragm seat (9).

5. Preload spring (2) may unlock in this manner, if not,

remove exhaust diaphragm cap screw (3), washer (8),

diaphragm(5), andpreload springwhileholding theseat

downagainstthe valve spring (6) tension.

6. Separatethediaphragmseat, valve spring and plunger

assembly.

7. Removediaphragmseat o-ring(7).

8. Removevalveretainer(10)andinletvalve(4)fromplunger.

Removeplunger o-rings (12)and(13)Figure 3.

LATE REVISION 45 PSI OPENING PRESSURE

(Figure 1)

1. Remove diaphragm seat retainer ring (1) while holding

diaphragm seat (9) in body.

2. Removedatecoderingwhilestillholdingdiaphragmseat

in body.

3. Allowseatto rise until valve spring (6) force is no longer

present.

4. Remove diaphragm seat assembly, valve spring and

plungerassembly.

5. Remove diaphragm seat o-ring (7), Phillips screw (3),

washer(8) and diaphragm(9).

6. Removevalveretainerring(14), valveretainer(10), inlet

valve(4), and o-rings(12)and (13) fromplunger.

CLEANING AND INSPECTION

1. Clean all metal parts in mineral spirits and dry them

completely.

2. Inspect all parts for excessive wear or deterioration.

Inspect valve seats for nicks or burrs. Check the valve

spring for cracks or corrosion.

3. Inspecttheboresofthevalvehousingfor deep scuffing

orgouges.

Replace all parts that were discarded and any parts not

foundtobeserviceableduringinspection,usingonlygenuine

Bendix replacement parts.

ASSEMBLY

Before assembling the TP-3™valve, lubricate all o-rings,

o-ringgrooves,body boresandrubbingsurfaceswithBendix

silicone lubricant (Pc. No. 291126) or equivalent.

NOTE: When using pipe thread sealant during assembly

and installation, take particular care to prevent the

sealant from entering the valve itself. Apply the

sealantbeginningwiththe secondthreadbackfrom

the end.

EARLY REVISION-OPENING PRESSURE 80 PSI

1. Position preload spring (2) then exhaust diaphragm (5)

over stud boss in the diaphragm seat (9).

2. Place washer (8) with lip out on exhaust diaphragm,

install and tighten cap screw (3).

3. Install snap-on valve (4) on plunger (13), position and

force valve retainer (10) down over valve.

4. Installtwo(2)plungero-rings(12)and(13)intheirproper

grooves.

5. Positionvalvespring (6) on diaphragm seat (9).

6. Force plunger(3)down into checkvalveseatuntil prong

of preload spring snaps into inner cut in plunger and

holdsinsertassemblytogether.

7. Position insert sealring(3)onseatthen place complete

insertinTP-3™valve body.

8. UsingTruarcpliers,install insertretainerring(1)inTP-3™

valvebody.Makesurethatringsnapsfullyintoitsgroove

inthe valve body.

LATE REVISION-OPENING PRESSURE 45 PSI

1. Install inlet valve (4) on plunger (3).

2. Position and force valve retainer (10) down over inlet

valve.

3. Installretainerring(14) beneath the inlet valve retainer.

4. Install both plunger o-ring (12) and (13) in the proper

grooves.

5. Place plunger and valve assembly in valve body.

6. Install Phillips head screw (3), diaphragm washer (8)

(cup side up) and diaphragm (5) into diaphragm seat.

7. Place inlet valve (6) spring into plunger.

8. Install diaphragm seat o-ring in body.

9. Position diaphragm seat assembly over spring and

plunger assembly and force into the body.

10.Replace date code washer and install retaining ring (1)

makingsurethe retainingring snapsfullyintothegroove.

TESTING REBUILT TP-3™VALVES

Perform operating and leakage checks as outlined in

previoussection.

GENERAL SAFETY GUIDELINES

WARNING! PLEASE READ AND FOLLOW

THESE INSTRUCTIONS TO AVOID

PERSONAL INJURYOR 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

enginebe inoperation, EXTREMECAUTION 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. Useonly theproper 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

notattempt 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.

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

the ATC function must be disabled (ATC indicator

lampshould be ON) prior toperforming any vehicle

maintenance where one or more wheels on a

drive axle are lifted off the ground and moving.

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