VEHICLE PREPARATION FOR TESTING

1. Adjust all brakes equally using the vehicle

manufacturers procedure.

2. Secure the vehicle on a level surface by means other

than the brakes and charge the air system to governor

cut-out (approximately 120 psi). Shut off engine.

CAUTION: To avoid possible injury due to

automatic application of the parking brakes during

testing, it is recommended that the parking brakes

be mechanically caged.

3. Check the vehicle or combination for excessive air

system leakage. If the combined leakage exceeds the

limits below, repair the sources of leakage before

proceeding.

AIR BRAKE PRESSURE BALANCE TEST

Objective: To determine the air pressure differences

between the various axles of a single or

combination vehicle.

Equipment: Dual test gauge (use a gauge with a 0-150

psi range.)

Testing:

1. Perform vehicle preparation and place the vehicle dash

control valves in the normal over-the-road position.

2. If the vehicle being tested is a single unit, such as a

straight truck or bus, install one half of the dual test

gauge directly in the #1 or primary circuit delivery of

the brake valve. For tractors or combination vehicles,

install one half of the dual test gauge in the trailer

service (control) line (between tractor and trailer).

NOTE: This half of the test gauge will remain here

for the duration of the test. Install the other half of

the test gauge in a service brake chamber at axle #1.

(Procedure will be repeated at each axle of the vehicle

combination). NOTE: Test gauge connection must

be between the air chamber and any control valve,

ideally directly in or at the chamber.

Brakes Brakes Fully

Released Applied

Single

Vehicle 4 psi in 2 mins. 6 psi in 2 mins.

Tractor

w/Trailer 6 psi in 2 mins. 8 psi in 2 mins.

Tractor

w/2 Trailers 8 psi in 2 mins. 10 psi in 2 mins.

3. Gradually apply the brakes via the brake valve and

record the axle pressure in the increasing (INC) column

of the axle #1 when brake valve primary delivery or

trailer service (control) line pressure is at 5, 10, 15,

20, 25, 30, 40, 50 and 60 psi. Repeat procedure for

each axle of the vehicle combination and record

pressure readings on the chart. (See partial example.)

IMPORTANT: Readings during this phase of the

procedure should be taken with increasing air

pressure only. Do not over apply and then release, as

an inaccurate reading will occur. Release brakes fully

and re-apply, if pressure is over applied.

4. Repeat the procedure using decreasing air pressure.

Fully apply (75 psi application min.) the service brakes

then gradually release and record the axle pressure

in the decreasing (DEC) column of the appropriate

axle when brake valve primary delivery or trailer

service (control) line pressure is at 60, 50, 40, 30, 25,

20, 15, 10 and 5, respectively. Repeat the procedure

for each axle and record the pressure readings on the

chart.

EXAMPLE:

IMPORTANT: Readings during this phase of the

procedure should be taken with decreasing air

pressure only. Do not under shoot the pressure and

partially reapply pressure as an inaccurate reading

will result. Fully apply the brakes and exhaust down

to the specified pressure.

5. When testing is complete, uncage the parking brakes

unless you are proceeding to FOUNDATION BRAKE

THRESHOLD PRESSURE TESTING.

Air Brake Pressure Balance Test

1 2 3 4

Commentaires sur ces manuels

Pas de commentaire

Mahle-rti NTO-200 (REV A) Handbücher

Bedienungsanleitungen und Benutzerhandbücher für Zubehör für die Luft Mahle-rti NTO-200 (REV A).
Wir stellen 1 PDF-Handbücher Mahle-rti NTO-200 (REV A) zum kostenlosen herunterladen nach Dokumenttypen zur Verfügung Bedienungsanleitung

Mahle rti NTO-200 (REV A) Bedienungsanleitung (16 Seiten)

Marke: Mahle-rti | Kategorie: Accessories for air | Größe: 0.33 MB |

Inhaltsverzeichnis

NTO-200

OVERVIEW

CHANGING DISPLAY UNITS

RESETTING ZERO POINT

SETTING UP AIR SUPPLY

INFLATING TIRES

REPLACING MEMBRANE CARTRIDGE

MAINTENANCE

SPARE PARTS

ERROR MESSAGES

TROUBLESHOOTING

TROUBLESHOOTING (Continued)

WARRANTY (Continued)

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BENDIX BW1555 Manuel d'utilisateur Page 3

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Inhaltsverzeichnis

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