TM-9-2350-277-20-2
CARRIER M113A3, M577A3, M1059A3, M1064A3, M1068A3 AND M58
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL VOLUME 2 OF 6
TM-9-2350-277-20-2 - Page 169 of 783
TM 9-2350-277-20-2
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDING
LUBRICATION INSTRUCTIONS — Continued
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Change 5
ITEM
NO.
INTERVAL
MAN-
HOUR
ITEM TO BE
CHECKED OR
SERVICED
CREWMEMBER
PROCEDURE
EQUIPMENT
NOT READY/
AVAILABLE
IF:
a
Semi-
Annual
Transmission/
Engine Spline
Drive (first check)
a.
The first type of inspection is the power
method. This method is strictly audio
based.
Metallic
clanking sound
is heard.
b.
To check the spline drive coupling, fully
pull out the fuel cut-off control from the
driver’s position, so fuel can not get to the
engine and it will not start. Dry start the
engine for 4-6 seconds.
c.
The sound produced from a good spline
drive coupling is muffled, and can be heard
as the engine is cranking. The sound is
muffled because the external spline on the
spline drive ring is nylon coated. When
the nylon coating, which is only 13 to 20
thousandths of an inch thick, on the spline
drive ring is good, it will mate tightly
with the engine’s internal spline teeth
and produce a muffled sound. The sound
produced from a worn-out spline drive
coupling is a very distinct metallic clanking
sound that can be easily heard as the engine
is cranking. When the nylon coating on the
spline drive ring is worn-out, it engages
in a metal to metal backlashing with the
flywheel’s internal spline teeth which are
uncoated. This causes the metallic clanking
sound.
b
Semi-
Annual
Transmission/
Engine Spline
Drive (second
check)
a.
The second type of inspection is the manual
audio method.
Metallic
clanking sound
is heard.
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