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MAINTENANCE
Crusader
MC-8
[ ___ PA_GE===4
=-
_5_1=--=--=--oA_TE_N_o_ve_mb_er_, _19_7 4_]
MANUAL
TROUBLESHOOT ING (Cont'd)
TROUBLE
AIR PRESSURE ~ISES TO NO~MAl TOO
SLOWLY
AIR PRESSURE RISES ABOVE NORMAL
AIR PRESSURE DROPS QUICKLY WITH EN-
GINE STOPPED AND BRAKES RELEASED
AIR PRESSURE DROPS QUICKLY WITH EN-
GINE STOPPED AND BRAKES FULLY APPLIED
BRAKES GRAB
COMPRESSOR KNOCKS CONTINUOUSLY
OR INTERMITTENTLY
SAFETY VALVE
11
BLOWS OFF"
CAUSE
at compressor unloading valves. l)efective
compressor.
Excessive leakage. Clogged air cleaner.
No clearance at compressor unloading va Ives.
Engine speed too low. Compressor discharge_
va Ive leakage. Worn compressor.
Excessive carbon in compressor cylinder head
or discharge line.
Defective air gauge (registering incorrectly).
Compressor governor out of adjustment.
Defective compressor governor.
Restriction in I ine between governor and com-
pressor unloading mechanism. Too much
clearance at compressor unloader valves.
Unloading valve cavities or unloading pass-
·age in compressor cylinder head blocked with
carbon. Compressor unloading valves stuck
closed.
leaking brake valve. Leaking tubing or
hose I ine. Compressor discharge valves leak-
ing. Compressor governor leaking. Excess-
ive leakage elsewhere in the air brake system.
Leaking brake chamber or roto chamber dia-
phragm. Leaking brake cylinder.
Leaking
brake valve. leaking tubing or hose line.
Grease on brake I ining - reline brakes.
Broke drum out of round. Defective broke
valve. Brake rigging binding.
Loose drive gear. Worn or burnt out bearings.
Excessive carbon deposits in compressor cyl-
inder head.
Safety valve out of adjustment. Air pressure
in the air brake system above normal.
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