TM 5-3805-281-24-1
System Operational Checks
2 AIR INTAKE SYSTEM CHECKS
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Run engine at slow idle.
YES: Go to next check.
AIR FILTER
RESTRICTION
INDICATOR AND
Slowly cover air intake tube.
NO: Check monitor circuit
SWITCH CHECK
fuse, air filter restriction
9010
indicator light and switch.
Does air filter restriction indicator light in cab come ON?
10
Go to Section 9015-15.
6
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AIR CLEANER
A--Air Cleaner Unloader Valve
YES: Go to next check.
UNLOADER VALVE
CHECK
Open left front access door.
NO: Replace unloader
valve.
Inspect air cleaner unloader valve (A).
Is unloader valve slightly open when the engine is not
running?
Is rubber flexible and showing no sign of becoming hard
or brittle?
Engine running.
Turn auto-idle switch off and turn engine rpm dial to fast
idle.
Does unloader valve close?
T7531BF
UN07JUN91
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