TB 9-2320-279-13&P-4
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 19F (-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 19F (-7 C).
1
5
4
JACO
BS
ENG
IN
EBR
AKE
XMSN
CAU
TION
FUSE
1
SPAR
E
2
3
Figure 1.
1. If check transmission indicator (1) illuminates when operating vehicle, apply service brake pedal (2) and stop
vehicle.