BENDIX TC-6 BRAKE VALVE Handmatig - Pagina 2

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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-6

valve should be inspected every 6 months or 1500 operating

hours, whichever comes first, for proper operation. Should

the TC-6

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valve not meet the elements of the operational

tests noted in this document, further investigation and service

of the valve may be required.

Every 900 hours, 25,000 miles or every 3 months, drop some

lubricant such as BW-650M silicone lubricant (Bendix part

number 291126) (Dow Corning 55-M) through the handle

operating slot, to re-lubricate the cam roller and hinge pin.

Perform operating and leakage tests.

REMOVING AND INSTALLING

Secure vehicle with spring brakes or blocks. Drain the

reservoir which supplies the TC-6

fasteners which secure the mounting bracket to the panel.

Disconnect the connecting air lines. Remove valve.

INSTALLING

A typical piping arrangement for the TC-6

Fig. 3. Check connecting air lines for integrity and foreign

material. Replace lines if necessary. Re-connect air lines.

Replace fasteners securing bracket to panel. Check

operation of valve by charging system and performing the

service check as described in this manual.

SERVICE CHECKS

OPERATING

Connect an accurate test gauge to the trailer service line

hose and leave the trailer emergency or supply hose

connected to the trailer or if a trailer is not available, connect

the trailer supply hose to an unvented dummy coupling or

to a plugged hose fitting. The trailer supply valve should be

in the normal position.

When the operating lever is moved to the fully applied

position, the gauge should register full reservoir pressure.

Intermediate positions should deliver proportional

intermediate pressures. Upon release, the gauge should

immediately register zero.

The location of the atmospheric end of the exhaust line

from the valve should be found, probably in the engine

compartment.

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With the TC-6

valve in the release position, no pressure

should register on the test gauge and leakage at the end of

the exhaust line should not be greater than 100 SCCM

(1" bubble in 5 seconds).

With the valve fully applied, leakage at the exhaust line

should not be greater than 175 SCCM (1" bubble in 3

seconds).

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valve. Remove the

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valve is shown in

If the valve does not function as described, or if the leakage

is excessive, it is recommended that it be returned to the

nearest Bendix authorized distributor for a factory

remanufactured valve under the exchange plan. If this is not

possible, the valve can be repaired with genuine Bendix parts,

in which case the following should be helpful. The

maintenance kit for the TC-6

DISASSEMBLY

Remove the valve from the panel. Place the lever in a vise

and with a firm pull the rubber handle may be removed.

Remove the two slotted head cap screws (14) which hold

the mounting bracket in place as shown in Fig. 2 and remove

the mounting bracket.

Drive the pivot pin (13) out of the body with a drift punch.

The handle (10), roller cam (11) and torsion spring (8) may

now be removed. Remove the roller cam from the handle.

The cam follower (9), graduating spring (6), plunger (12),

and plunger return spring (4) may now be removed through

the top of the valve. Care should be taken not to lose washer

(15).

Place the body in a soft-jawed vise and remove cap nut (16).

Remove o-ring (1) from cap nut.

Inlet valve spring (3) and inlet valve (2) may now be removed.

CLEANING AND INSPECTION OF PARTS

Clean all metal and plastic parts with mineral spirits or

equivalent. Wipe all o-rings and rubber parts dry. Replace

any which show signs of wear or deterioration. Inspect

valve seats for nicks or burrs and remove any deposits.

Check all springs for distortion, cracks and corrosion.

Replace all parts not considered serviceable after inspection.

ASSEMBLY

Before assembling the valve all bores, cam, pivot pin,

plungers, and o-rings should be lubricated with silicone

lubricant Dow Corning 55-M (Bendix part number 291126).

Place body in a soft-jawed vise with ports pointing up. Place

inlet valve (2) in inlet cavity and install inlet valve spring (3).

Place o-ring (1) on cap nut (16) and assemble cap nut in

body. Torque cap nut to 50-150 inch pounds.

Install o-rings (5) and (7) on plunger (12) and cam follower

(9). Caution: o-ring (7) is slightly larger than (5) and goes on

the cam follower (9).

Reverse position of body in vise and install plunger return

spring (4), plunger (12), washer (15), graduating spring

(6), and cam follower (9). Note: The cam follower must be

positioned so that the projection on the side of the body

matches the corresponding groove in the body.

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valve is part number 289890.