TM 5-3805-262-342-12. AIR BRAKE SYSTEM TROUBLESHOOTINGMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. AIR COMPRESSOR FAILS TO MAINTAIN SUFFICIENT AIR PRESSURE.Step 1.Step 2.Step 3.Step 4.Disassemble air compressor cylinder head and unloader (page 3-466).Check exhaust valves and seats for any damage that could causeleakage.a. Replace exhaust valves and seats if worn or damaged (page3-472).b. If exhaust valves and seats are okay, go to step 2 below.Check cylinder head area where inlet valves are installed forpitting or chipping.a. If cylinder head is pitted or chipped in inlet valves area, re-place cylinder head.b. If cylinder head is okay, go to step 3 below.Check exhaust valve springs for damage.a. If exhaust valve springs are damaged, replace.b. If exhaust valve springs are okay, go to step 4 below.Check unloader plungers and associated bores in cylinder head forpresence of foreign matter.a. If foreign matter present, remove.b. If foreign matter not present, remove pistons (page 3-475) andcheck piston rings for damage.2. NOISY OPERATION OF AIR COMPRESSOR.Step 1.Remove air compressor if not already removed (refer to TM 5-3805-262-20).From bottom of air compressor, check for broken or bent connectingrods.a. If connecting rods broken or bent, replace (page 3-475).b. If connecting rods are okay, go to step 2 below.2-111
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