TB-9-2320-279-13-P-4

TRUCK, TRACTOR, LIGHT EQUIPMENT TRANSPORTER (LET), 8X8, M983A2 LET

TECHNICAL BULLETIN; OPERATOR AND FIELD LEVEL

APRIL 2008

TB-9-2320-279-13-P-4 - Page 161 of 744

OPERATOR MAINTENANCE

LIMP HOME/TRANSMISSION FAULT

INITIAL SETUP:

Not Applicable

ALLISON 4500SP TRANSMISSION WILL NOT SHIFT INTO OR OUT OF GEAR (CHECK TRANSMISSION

INDICATOR ILLUMINATED)

CAUTION

If transmission range selector flashes current range selection while operating vehicle (shift

selection is inhibited),

DO NOT SHUT OFF ENGINE

or attempt to change range selection.

Shutting off engine may result in the inability to select a drive range at startup, and diagnostic

data may be lost. Move vehicle to safe place and notify field level maintenance as soon as

possible.

NOTE

When transmission oil is below 19°F (-7 C), the only gears available are R (reverse), N

(Neutral), and 3 (third gear range) when D (drive) is selected. The remaining gears in D

(drive) will not be available until transmission oil in sump warms above 19°F (-7 C).

JACOBS

CAUTION

ENGINE BRAKE

XMSN

FUSE 1

SPARE

3

4

5

1

2

Figure 1.

1. If check transmission indicator (1) illuminates when operating vehicle, apply service brake pedal (2) and stop

vehicle.

TB 9-2320-279-13&P-4

0017

0017-1