TM 5-3810-307-24-1-1
b.
Running check.
a.
Place crane on outriggers.
b.
Restart engine from carrier cab and
(1)
Place crane on outriggers.
position shift control lever in F4.
(2)
Restart engine from carrier cab,
c.
Release brakes and run transmission up
apply brakes, and position shift
to F4.
control lever to F6.
(1)
As turbine speed (T:) approaches
(3)
Position DRIVE AXLE selector
engine speed (E:), lockup should
switch to 4WD, release brakes,
occur and LED #37 should
and accelerate through gears.
illuminate green.
(a) Front wheels should turn until
(2)
Once lockup occurs, engine
4WD automatically disengages
speed and turbine speed should
when transmission shifts into F4
be equal.
or R5.
d.
Maintaining engine speed at 2100-2200
CAUTION
rpm, move transmission shift control
lever to F5.
4WD will re-engage when transmission
reenters f2 or r3. This should not be
(1)
Lockup should disengage when
allowed to occur if front wheels are not
turbine
speed
reaches
turning at same speed as rear wheels.
approximately 2000 rpm.
Otherwise, damage to transmission
could occur.
(2)
Immediately following unlock
(LED #37 should go out),
(b)
Position DRIVE AXLE
transmission should upshift and
selector switch to 2WD to prevent
lockup should re-occur again
transmission from re-entering
when turbine speed approaches
4WD
automatically
when
engine speed (LED #37 should
transmission reaches F2 or R3
illuminate green).
during deceleration (front wheels
will be turning at different speed).
e.
If behavior is different than above, check
the following:
(c) Release throttle and apply
brakes.
(1)
If LED #37 is a color other than
green, see output LED color
(d) If 4WD does not function as
definitions in CHECKOUT KIT -
stated, recheck conditions in step
Definition, and repair accordingly.
6.a. above.
(2)
If LED #37 is green but the
7.
Converter Lockup Output
turbine and engine speeds are
not equal during lockup, check
NOTE
pressure at lockup port on right
side of transmission.
This LED lights when program is
attempting to achieve torque converter
(a)
Pressure should equal
lockup. Lockup is only allowed in F4 thru
transmission clutch pressure
F6 when certain engine speed and
[240-280 psi (1655-1931 kPa).
turbine speed criteria dependent on
throttle position are met [i.e., conditions
(b) If pressure is incorrect, check
indicate vehicle is cruising (not
hose routing to and from
accelerating or pulling hard)].
modulator valve.
(c)
If pressure is
good,
transmission is defective.
2-3-24
