TM 5-3810-307-24-1-1
Table 2-3-7. Lockup Parameters
THROTTLE
TRANSMISSION
TURBINE
TURBINE
TURBINE
MODE
GEAR ACTIVE
ENGAGEMENT
DISENGAGEMENT
DISENGAGEMENT
SPEED
SPEED
SPEED
(MINIMUM)
(DUE TO LOAD)
(FOR UPSHIFT)
Half Throttle
3 thru 6
1400
1200
2350
Full Throttle
4
1500
1400
2350
Full Throttle
5 or 6
1900
1800
2350
Braking
1 thru 6
1200
1000 (For downshift)
2350 (Only if overspeed)
a.
If voltage does not change as stated,
NOTE
there is a fault in the EPROM or the APC
100 control box, see APC 100
This again assumes that all inputs and
CONTROL BOX DIAGNOSTICS and
drivetrain loading are proper.
correct any fault(s).
b.
If transmission reacts as stated, proceed
NOTE
to step 12.
This assumes drivetrain is not inducing a
12. Keeping throttle at one position, apply brakes
load which would cause turbine speed to
to reduce turbine speed to the loaded
stay well below the engine speed. The
disengagement speed, refer to Table 2-3-7. While
engine will be laboring if this is the case.
doing this, watch the voltage at lockup solenoid. The
The converter will normally achieve
voltage should drop to 0 vDC and lockup should
lockup very easily with crane on
disengage at the specified speed.
outriggers.
a.
If voltage does not drop, there is a fault
b.
If voltage does change, but lockup
in the EPROM or the APC 100 control
engagement is not noticed, check the
box, see APC 100 CONTROL BOX
hydraulic circuit related to lockup for
DIAGNOSTICS and correct any fault(s).
faults. If transmission lockup port is
receiving pressure, transmission is
b.
If voltage drops but lockup does not
defective.
disengage, check lockup hydraulic circuit
and transmission for faults.
c.
If voltage changed and lockup occurred
properly, proceed to step 10.
c.
If lockup disengages, converter lockup
circuit is functioning properly.
10. Increase engine speed to 2400-2500 rpm and
move transmission shift lever to F5.
d.
Disconnect voltmeter and/or jumper wire
from wire 448.
11. Lockup should disengage.
Immediately
following unlock, the transmission should upshift and
4WD Diagnosis
lockup should re-occur when the turbine speed again
approaches engine speed.
1.
Place machine on outriggers, with tires off the
ground, and start engine from carrier cab.
a.
If transmission does not upshift, there is
a fault in the EPROM or APC 100 control
2.
Position DRIVE AXLE selector switch to 2WD,
box, see APC 100 CONTROL BOX
position transmission shift lever to F2, release the
DIAGNOSTICS and correct any fault(s).
brakes, and accelerate slightly. The rear wheels
should turn and the front wheels should remain
relatively still.
2-3-34
