BENDIX SD-11-1326 Technical Specifications, Preventive Maintenance, Operating And Leakage Tests

TECHNICAL SPECIFICATIONS

AH-1B™Air Hydraulic Intensifier Assembly

Power ratio - 20.2 to 1

Weight - approximately 2-1/2 pounds

Air Actuator

Effective area of diaphragm at 2-1/8 inches of push rod stroke - approximately 28 sq.in.

Volume at 2-1/8 inches of push rod stroke - approximately 75 cubic inches.

Master Cylinder

Bore diameter - 1.38 inches

Maximum piston stroke - 2-1/8 inches

Maximum fluid displacement - 3.17 cubic inches

Fluid Reservoir

Volume - 33.5 cubic inch to “MAXIMUM” level mark with cap removed.

PREVENTIVE MAINTENANCE

Every month, after 8,000 miles, or 300 operating hours;

1.Remove accumulated dirt and grime from the area around the reservoir cover. With the ignition switch in the on position, remove the cover and hold in an upright position and allow brake fluid in the tube of the cap to drain back into the reservoir. Check to see if the low fluid indicator bulb is operating (in cab of vehicle).

2.If the fluid level is low, fill to proper level indicated on the side of the reservoir. CAUTION: Fill the reservoir with type and grade of fluid recommended by the vehicle manufacturer.

3.Check tightness of the mounting nuts, air and hydraulic fittings.

4.Make a visual inspection of air and hydraulic lines for kinking, bending or fraying. Replace as necessary.

Every 12 months; 100,000 miles; or 3,600 operating hours;

1.Perform the operating and leakage tests. Replace or repair components or assemblies as indicated using only genuine Bendix parts.

OPERATING AND LEAKAGE TESTS

1.With vehicle air system pressure built to governor cut-out, make and hold a full brake application. Hold for at least 5 minutes. Using a soap solution, check for air leaks at fittings and air lines. Tighten and/or replace as necessary. Apply a soap solution around the actuator clamp ring. No leakage is permitted. Tighten or replace as necessary. Apply a soap solution to the actuator non-pressure plate drain holes. Replace the actuator diaphragm if leakage is detected.

2.While holding the brake valve in the fully applied position, check for hydraulic fluid leaks at all fitting connections and at the hydraulic cylinders in the foundation brake. Check for fluid leakage at the drain holes of the actuator non-pressure plate. Repair or replace components as necessary.

3.With the reservoir filter cap removed apply and fully release the brakes several times while observing the fluid in the reservoir. CAUTION: WEAR SAFETY GLASSES AS FLUID MAY EXIT THE RESERVOIR.

A slight fluid turbulence should be noted at the beginning of the application and should immediately cease. If prolonged turbulence is noted, the master cylinder must be repaired or replaced.

WARNING! PLEASE READ AND FOLLOW THESE INSTRUCTIONS TO AVOID PERSONAL INJURY OR DEATH:

When working on or around brake systems and components, the following precautions should be observed at all times:

1.Park the vehicle on a level surface, apply the parking brakes, and always block the wheels. When working around or under the vehicle, stop the engine and remove the key from the ignition. Always keep hands away from chambers as they may apply as system pressure drops. Always wear safety glasses.

2.When working in the engine compartment, the engine should be shut off and the ignition key should be removed. Where circumstances require that the engine be in operation, extreme caution should be used to prevent personal injury resulting from contact with moving, rotating, leaking, heated or electrically charged components.

3.Do not attempt to install, remove, disassemble or assemble a component until you have read and thoroughly understand the recommended procedures. Use only the proper tools and observe all precautions pertaining to the use of those tools.

4.Following the vehicle manufacturer’s recommended procedures, deactivate the electrical system in a manner that safely removes all electrical power from the vehicle.

5.If the vehicle is equipped with an air over hydraulic brake system or any auxiliary pressurized air system, make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle. If the vehicle is equipped with an AD-IS™air dryer system or a dryer reservoir module, be sure to drain the purge reservoir.

6.Never connect or disconnect a hose or line containing pressure; it may whip. Never remove a component or pipe plug unless you are certain all system pressure has been depleted.

7.Never exceed manufacturer’s recommended pressure.

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