TM 5-3805-260-24 SYMPTOMS CAUSE REMEDY C. Poorly filtered inlet air. C. Check for damaged, defective or dirty air filter on engine.  Check for leaking, damaged or defective compressor air intake components (i.e., induction line, fittings, gaskets, filter bodies, etc). D. Insufficient compressor cooling (compressor runs D. For air-cooled portions of the compressor: hot). 1. Remove accumulated grease, grime, or dirt from the cooling fins.  Replace components found damaged. 2. Check for damaged cooling fins.  Replace components found damaged. E. Contaminants not being E. Check reservoir drain valves to insure that regularly drained from they are functioning properly.  It is recom- system reservoirs. mended that the vehicle should be equipped with functioning automatic drain valves, or have all reservoirs drained to zero (0) psi daily, ’or optimally to be equipped with a desiccant-type air dryer prior to the reservoir system. F. Compressor runs loaded F. Vehicle system leakage should not exceed an excessive amount of industry standards of 1 psi pressure drop time. per minute without brakes applied, and 3 psi pressure drop per minute with brakes applied.  If leakage is excessive, check for system leaks and repair. G. Excessive engine G. Test for excessive engine crankcase crankcase pressure. pressure and replace or repair crankcase ventilation components as necessary.  (An indication of crankcase pressure is a loose or partially lifted dipstick.) H. Excessive engine oil H. Check the engine oil pressure with a test pressure. gauge and compare the reading to the engine specifications.  Bendix does not recommend restricting the compressor oil supply line because of the possibility of plugging the restriction with oil contaminants.  Minimum oil supply line size is 1/4" O.D.  tubing. I. Faulty compressor. I. Replace or repair the compressor only after making certain none of the preceding installation defects exist. 31.  Noisy compressor operations. A. Loose pulley. A. Inspect the fit of pulley on the compressor crank shaft.  The pulley must be completely seated and the crankshaft nut must be tight.  If the com- pressor crankshaft surface or its keyway are damaged, it is an indication of loose drive com- ponents.  If damage to the compressor crankshaft is detected, replace the compressor or the crankshaft.  When installing pulley, torque the crankshaft nut to 100 foot pounds.  DO NOT BACK OFF THE CRANKSHAFT NUT TO ALIGN THE COTTER PIN AND CASTELLATED NUT. DO NOT USE IMPACT WRENCHES. 2-35