KNOWN INFO TEST OPTIONS Visual InspectionNOYES7.Is air present at cab levelingvalve input port?If air is present, cab leveling valve is faulty.Go to step 8of this fault.Replace cab levelingvalve (para 16-8).CTIS operates.Air hoses free from kinks andleaks.Variable control check valveOK.Air hose 503 OK.Air spring cylinders OK.Air hoses 504 and 505 OK.POSSIBLE PROBLEMSFaulty air hose 522.Faulty cab leveling valve tee fitting.Faulty air hose 506.Faulty air/hydraulic manifold.Faulty pressure protectionvalve.Faulty air hose 501.Faulty cab leveling valve.TM 9-2320-365-20-22-1974.8 Change 1t3. CAB LEVELING AIR SPRINGS DO NOT OPERATE (CONT) REASON FOR QUESTION
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