I have a Wabco air comp and it doesnât kick in/ stop when is supposed to. Started driving - same thing, pressure dropped below 100psi and the compressor would not kick in. Repair or replace as needed. Then after a few of these "stop and build pressure" exercises, it started working fine, it would kick in at 100-105psi to build it up to cutout at 125. 4 Compressed Air Generating System Compressor (Single Cylinder) 41./ 91. Sometimes though, the air evacuating from the unloader valve does not stop The unloader valve continues leaking air after the compressor is stopped. Air Dryers 9 Load Sensing Valves -Air Susp 19 ... 2 Compressor 15 Foot Brake Valve 3 Air Dryer 16 Park Brake Valve ... WABCO PARTS CATALOGUE 2014 UNLOADER AND GOVERNOR VALVES 975 303 473 0 / 474 0 275508 Part Number Repair Kit Service Kit Description Port size. Compressor Unit 415 ... Unloader 975 303 Remove the unloader line from the governor and port 4 of the dryer. Single Chamber Air Dryer+Unloader AIR REGULATORS / 4-WAY VALVES / AIR PROCESSING UNIT, SPECIAL OFFERS, stock, WINTER SALE OE CODES: WABCO 9324000060DAF 1505119, 1506409, 1506410, 1519202R, 1526796; Evobus A0004301315, A0004302915, A0004303015, A0004309815, ⦠Air continuously leaks out of the unloader valve on your air compressor, and this is a problemâ¦. Aug 22, 2018 #1. visoiuvlad Light Load Member. Volvo d13 air compressor Wabco unloader valve Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by visoiuvlad, Aug 22, 2018. WABCO. Spray wd40 into the compressor intake while running till it starts pumping. From searching online and talking to a couple of people I understand I need an unloader valve. Air compressor is malfunctioning. When the air pressure becomes ⦠why? Compressor (Twin Cylinder) 41./ 91. Changed the governor, ⦠If the air system ⦠Sep 5, 2014 0. 121 63. This video shows the procedure to get unloader valve unstuck. 6 Air braking system with ABS/ASR (4S/4M) Legend: Pos. If compressor or dryer pressure relief valves are open, diagnose the cause. If there was no way to prevent it, when the unloader valve opened, all of the air already compressed into the tank would escape out the unloader valve which is open to ⦠1 Compressor 2 Air dryer with combined unloader 3 Four circuit protection valve r i o v r e s e r r i 4A Listen and check for large air leaks on air brake/suspension components. The compressor's unloader mechanism and governor (along with a synchro valve for the Bendix® DuraFlo⢠596 air compressor) control the brake system air pressure between a preset maximum and minimum pressure level by monitoring the pressure in the service (or âsupplyâ) reservoir. WABCO. Page 10 UNLOADER LINE SYSTEM SAVER 1200 PLUS AIR DRYER COMPRESSOR DRYER SYSTEM INLET PORT RESERVOIRS ONE-WAY CONTROL CHECK (PURGE) VALVE PORT COMPRESSOR DISCHARGE LINE PURGE VALVE (EXHAUST) SUPPLY SUPPLY LINE TANK 4012522a Figure 1.6 Meritor WABCO Maintenance Manual 34 (Revised 03-16) Page 11: Air ⦠Air leaks from purge valve. Well, if air continuously leaks out of the unloader valve, then the compressor tank is emptying, and the compressor needs to restart to replenish the air in the tank to get back up to cut out pressure so it can stop on its own. Have a Wabco air comp and it doesnât kick in/ stop when is to! From searching online and talking to a couple of people I understand I need unloader. Running till it starts pumping of the dryer, pressure dropped below 100psi and the compressor intake running! 100Psi and the compressor would not kick in Load Member kick in thing pressure! 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