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 TM 10-3930-673-20-1
22. COMPRESSION KNOCKS (CONT).
2
KNOWN INFO
TEST OPTIONS
Fuel system fuel OK.
Visual Inspection.
Is fuel in fuel tank known to
POSSIBLE PROBLEMS
REASON FOR QUESTION
be of good quality?
Fuel quality poor.
If fuel quality is poor, engine will
Engine overloaded.
produce audible compression
knocks.
Drain and flush fuel
tank and replace
NO
fuel
(Para 5-9).
YES
KNOWN INFO
TEST OPTIONS
3
Fuel system fuel OK.
Visual Inspection.
Is payload within specified
Fuel quality OK.
REASON FOR QUESTION
load range? Is gear range in
POSSIBLE PROBLEMS
If machine is overloaded, or gear
use correct for operation and
Engine overloaded.
range incorrect, engine will
load?
produce audible compression
knocks.
If overloaded,
reduce load. If gear
NO
range too high, shift
to lower gear.
YES
Notify Direct Support
about this fault.
2-740
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