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SD-03-3652

Bendix

TP-3

Tractor Protection Valve

FIGURE 1 - BENDIX

TP-3

TRACTOR PROTECTION VALVE

DESCRIPTION

The Bendix

TP-3

Tractor Protection Valve is used in

combination with the Bendix

PP-3

™

Trailer Supply Valve

on pre-121 tractors, and the Bendix

PP-7

™

Trailer Supply

Valve, or the Bendix

MV-3

Valve, on post-121 tractors. It

contains a passage for trailer supply air and a service line

shut off valve. It is normally 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 their respective

ports in the TP-3 valve. See Figure 2.

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

the plunger(11). The TP-3 valve requires approximately 45

psi to open the inlet valve. Whenever the pressure from

the trailer supply valve drops below 45 psi, the TP-3 valve

will close the service line shut-off valve.

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 Bendix TP-3 valve should be inspected every 6 months

or 1500 operating hours, whichever comes ﬁ rst, for proper

operation. Should the TP-3 valve not meet the elements

of the operational tests noted in this document, further

investigation and service of the valve may be required.

TRACTOR

EMERGENCY

PORT

TRAILER

SERVICE

PORT

TRAILER

EMERGENCY

PORT

TRACTOR

SERVICE

PORT

O-RING(13)

INLET VALVE(4)

RETAINING RING(1)

O-RING(7)

SEAT

O-RING(12)

VALVE RETAINER(10)

PLUNGER(11)

CAP SCREW(3)

WASHER(8)

DIAPHRAGM(5)

DIAPHRAGM

SEAT(9)

VALVE SPRING(6)

RETAINING RING(2)

EXTERIOR VIEW

CROSS SECTION

1 2 3 4

Resumo do Conteúdo

Página 1 - Tractor Protection Valve

1 SD-03-3652Bendix® TP-3® Tractor Protection ValveFIGURE 1 - BENDIX® TP-3® TRACTOR PROTECTION VALVEDESCRIPTIONThe Bendix® TP-3® Tractor Protection Val

Página 2 - INSTALLING

2FIGURE 2 - SYSTEM SCHEMATICTRAILER SERVICE LINETRAILER EMERGENCY LINEFRONT RESERVOIRBRAKE VALVEREAR RESERVOIRDOUBLE CHECK VALVECOMPRESSORBENDIX® MV

Página 3 - ASSEMBLY

3DISASSEMBLY(See Figure 1.)1. Remove the diaphragm seat retainer ring (1) while holding the diaphragm seat (9) in the body.2. While still holding th

Página 4

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