BENDIX BW1566 Bedienungsanleitung PDF herunterladen (Seite 3)

DESCRIPTION

The TC-4

™

modulating control valve is a cam operated,

graduating type control valve. The valve is used to control

the application and release of spring brake actuators, and is

generally mounted in the cab within easy reach of the driver.

Modulated control of the emergency brakes (spring brakes)

is effected by moving the valve’s spring loaded lever. Moving

the lever against the resistance of the spring applies the

brakes and, allowing the valve handle to return, releases the

brakes.

When the valve is used for parking, the locking button is

moved into the locked position after the handle has been

moved to the “Brakes Applied” position. The lever is now

mechanically locked in position. To release the lever, the

lever is slightly depressed, the lock button moved out of the

locked position and the lever returned to the “Brakes

Released” position.

Porting consists of one (1) supply port, two (2) delivery and

two (2) exhaust ports.

OPERATION

Reference Figure 2, the TC-4

™

valve is generally used in

conjunction with a relay valve to control the application and

release of the spring brakes. In a typical system, the TC-4

™

valve and the relay valve receive supply air from the

emergency/parking reservoir.

RELEASED POSITION (Spring Brakes Released)

In the normal run position, air enters the supply port of the

TC-4

™

valve, flows by the open inlet valve and out the delivery

port. Air flows to the service (control) port of the relay valve

causing the relay valve to deliver air to the spring brakes,

holding them in the released position.

APPLY POSITION (Spring Brakes Applied)

Moving the lever to the apply position allows the inlet valve

to close and the exhaust passage to open. This allows the

air being delivered to the service (control) port of the relay

valve to exhaust to atmosphere (through the exhaust of the

foot brake valve). With air exhausted from the service

(control) port of the relay valve, the relay valve responds,

exhausting the air from the spring brakes (allowing the brakes

to apply).

With sufficient air pressure in the emergency/parking

reservoir, modulation of the spring brake application is

possible; the amount of braking force governed by the

position of the TC-4

™

valve lever.

With reference to Figure 2, note that the exhaust of the

TC-4

™

valve is connected to a delivery line of the foot brake

valve. This prevents the compounding of spring brake and

service brake application forces on the slack adjusters.

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 TC-4

™

valve should be inspected every 6 months or 1500 operating

hours, whichever comes first, for proper operation. Should

the TC-4

™

valve not meet the elements of the operational

tests noted in this document, further investigation and service

of the valve may be required.

Check for proper operation before placing vehicle in operation.

OPERATING AND LEAKAGE TESTS

If valve is to be tested on vehicle, block the vehicle wheels.

Build system pressure to approximately 100 psi and place

lever to “apply” position and observe that spring brakes

apply.

With lever in apply position, lock lever in place with locking

button. Coat exhaust port with soap solution; leakage should

not exceed a 1" bubble in less than 5 seconds.

(NOTE: If line is connected to exhaust port, disconnect line

or remove pipe plug from other exhaust port.)

Excessive leakage would indicate a faulty inlet valve.

Release locking button and place lever in release position;

observe that brakes fully release. Coat exhaust port with

soap solution; leakage should not exceed a 1" bubble in not

less than 5 seconds. Excessive leakage would indicate

exhaust valve or lower o-ring leakage. (If line at exhaust port

was disconnected, connect line and/or tighten fitting or pipe

plug.)

Remove dial; while making a full foot valve application, coat

top of valve with soap solution. Leakage permitted is a 1"

bubble in not less than 5 seconds.

Excessive leakage would indicate upper o-ring leakage. (If

line is not connected to exhaust port, it will be necessary to

apply 100 psi to the exhaust port to check for upper o-ring

leakage.)

Soap area around supply port cap nut to check for cap nut

o-ring leakage. No leakage permitted.

Blow out or dry all soap solution and replace dial.

To check modulation of valve, it will be necessary to test

while vehicle is in motion. Select a suitable location to

perform braking test. With vehicle in motion, apply the TC-4

™

valve several times.

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