©
200508 1-1
General
ALLISON 1000 & 2000 AUTOMATIC GEARBOXES
ΛΦ45/55 series
3
7
1. GENERAL
1.1 SYSTEM DESCRIPTION
The Allison 1000 and 2000 series of automatic
gearboxes are completely automatic,
electronically controlled gearboxes.
The automatic gearboxes have five forward gears
and one reverse gear.
Design
The different gears are engaged by using three
planetary systems and five lamella clutches
driven by the electronic unit.
The electronic unit receives signals from the
push-button selector block, the selector switch,
the accelerator pedal and several speed sensors.
On the basis of these signals the electronic unit
computes the ideal switching moment.
The torque converter in the automatic gearbox is
fitted with a " lock-up". Under certain
circumstances the "lock-up" provides a rigid link
between the pump and the turbine. As a result,
slip losses from the torque converter are
overcome. This results in lower fuel consumption.
Starting
To start the vehicle, the gearbox must be in the
neutral position. If the gearbox is in a forward
gear or in reverse, the vehicle cannot be started.
DAF LF Gearboxes and Clutch Service Manual
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