BENDIX TP-2 TRACTOR PROTECTION VALVE Handmatig - Pagina 2

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CONTROL

COMPRESSOR

FIGURE 2 - TRACTOR PROTECTION SYSTEM

tractor service port to the trailer service port. The stem of

the service and exhaust valve contacts the emergency valve,

sealing the exhaust passage. Continued travel of the service

and exhaust valve plunger moves the emergency valve off its

seat and allows air to flow from the tractor emergency port

to the trailer emergency port.

EMERGENCY POSITION

If air pressure in the control port (and on top of the diaphragm

and plunger assembly) drops below approximately 40 psi,

the combined forces of the exhaust plunger spring, the

service and exhaust valve spring and the emergency valve

spring will return the diaphragm and plunger assembly

allowing the service and exhaust valve and the emergency

valve to close. Further flow of air through either the service

or emergency ports is stopped. The loss in air pressure

which would precede such action would be indicated to the

driver, either visually or audibly by the low pressure warning

device, before such action would occur.

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 TP-2

valve should be inspected every 6 months or 1500 operating

hours, whichever comes first, for proper operation. Should

™

the TP-2

valve not meet the elements of the operational

VALVE

NO. 1

RESERVOIR

BRAKE

VALVE

NO. 2

RESERVOIR

CHECK

VALVE

tests noted in this document, further investigation and service

of the valve may be required.

OPERATING AND LEAKAGE CHECK

NOTE: To make the following operating and leakage

checks, an accurate test gauge installed in spare

hose coupling is required. The vehicle dash gauge

should be checked for accuracy against the test

gauge prior to making these tests.

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

brakes during these test.

2. Drain vehicle reservoirs. Then close drain cocks.

3. Disconnect vehicle emergency and service hose

couplings and connect assembled hose coupling and

test gauge in tractor emergency hose coupling.

4. Start engine and build up system pressure.

5. As pressure in system builds up there should be no

pressure reading on test gauge. When system pressure

reaches 30 psi on dash gauge, make and hold a foot or

hand valve application and observe that no air escapes

at the open service hose coupling.

6. When system pressure reaches 40 to 60 psi, valve should

open and pressure reading show on test gauge. Allow

system to build up to 100 psi and shut off engine.

7. With soap solution coat exhaust port of the Tractor

Protection Valve. Leakage of a 1" bubble in 3 seconds

is permissible (175 SCCM).

™

8. Place the tractor protection control valve in the

"Emergency" position and note that emergency line

pressure drops promptly to zero on test gauge.

Disconnect coupling and test gauge.

TRAILER

SERVICE LINE

TRAILER

EMERGENCY

LINE

TRACTOR

PROTECTION

VALVE