Document gN4EkLbdmZNBZpJnYyapzZGV

J PROCEDURE FOR COMPLETE A RECOMMENDED BY All equipment, even identical installations, should be checked out before going into service, out again, regularly, as part of standard preventive maintenance. The same procedure cat confirm driver complaints. Proper testing saves many hours of work and many unnecessa. All the equipment required can be made easily from parts on hand. The first tool requires i gage of known accuracy, drain cock, shut-off cock and another glad hand. The second tool i of known accuracy, flexible hose and a male and female tee fitting. (This O Completely drain all air tanks in the sys tem. At the time the drain cocks are open, hold a hand below it to determine if there The gage should read the pressure in the dry tank and thus it should remain con stant. This determines that the one way - is excess oil or contamination. If this is check valve between the dry tank and the found, take the necessary measures to wet tank is holding pressure. j correct the source of difficulty. Install the check gage with glad hands in the emergency air line and dose the shut off cock. Do not connect service line at this time. Attach the service line to the trailer and open shut-off cock. Start engine and charge the complete system up to the pressure of governor cut out. Start engine. With no air pressure in sys tem apply foot valve and note when stop lights light, which should be approxi mately 5 PSI. Release foot valve and continue to charge system. Time required for pressure build-up to governor cut-out between 100-105 PSI should not exceed 5 minutes. At the same time, low pressure warning device- should remain on until the pressure has built up to approximately 60 PSI. At this point, the warning buzzer must, stop sounding or the warning light must go out. As the pressure builds up, check the accuracy of the gage in the cab with that of the test gage.. Make sufficient brake applications to re duce the air pressure to the point where the governor should cut in between 80-85 PSI, resuming compression. With the engine stopped, let air out of the wet tank and watch the gage in the cab. Stop the engine. Apply full pressure to the brakes through the foot pedal. At this point all the lines are fully charged and the system is under maximum pressure. Now go around all the air lines and listen, you may hear a leak at any of the valves, fittings, bends or chambers. Start at the compressor and while listening, look. Watch for sharp bends in the lines. Notice that no tubing is squashed to slow down the flow of air, see that hoses are in good condition. With the brakes fully applied, .pressure drop should not exceed three pounds per minute. With full governor cut out pressure and the brakes released, the drop should not exceed two pounds per minute. Apply emergency control valve in cab. See that the trailer brakes are set up and the tractor air is retained. This checks the tractor protection system. SPNY 005962