WORKHORSE CUSTOM CHASSIS
Service Manual
2007 W Series
SECTION
7.2
PAGE
50
Automatic Transmission – Allison
2007 W Series Chassis
© 2006 Workhorse Custom Chassis — All Rights Reserved
WSM082106
INTRODUCTION
OBJECTIVES OF THIS SECTION
This section is intended to provide information regarding
the automatic transmission systems. This is specifi c to
the W-Series Workhorse Chassis.
Explanations for most components will include purpose,
function, operation, and location. Guidance for proper
and safe disassembly, inspection, repair, and assembly
are provided.
DESCRIPTION AND OPERATION
Transmission General Information
When attempting to diagnose a suspected 1000 Series
transmission problem, always begin by conducting
the Functional Test Procedure. Refer to Functional
Test Procedure. This procedure indicates the proper
path for diagnosing the transmission by making basic
checks. This procedure will refer you to the locations of
specifi c checks. After you have determined the cause
of a condition, you either take corrective action or install
a replacement transmission. Refer to Transmission
Replacement.
NOTICE:
DO NOT, under any circumstances, attempt to diagnose
DO NOT, under any circumstances, attempt to diagnose
a powertrain condition without basic knowledge of this
a powertrain condition without basic knowledge of this
powertrain. If you perform diagnostic procedures with-
powertrain. If you perform diagnostic procedures with-
out this basic knowledge, you may incorrectly diagnose
out this basic knowledge, you may incorrectly diagnose
the condition or damage the powertrain components.
the condition or damage the powertrain components.
You must be familiar with some basic electronics in
order to use this section of the manual. You should be
able to use the following special tools:
• A Digital Multimeter (DMM)
• A circuit tester
• Jumper wires or leads
• A line pressure gauge set
The functional test procedures verify the correct
operation of electronic components in the transmission.
These procedures eliminate the unnecessary removal of
transmission components.
IMPORTANT:
If you probe a wire with a sharp instrument and do not
If you probe a wire with a sharp instrument and do not
properly seal the wire afterward, the wire corrodes and
properly seal the wire afterward, the wire corrodes and
an open circuit results.
an open circuit results.
Diagnostic test probes are now available that allow you
to probe individual wires without leaving the wire open to
the environment. These probe devices are inexpensive,
easy to install and they permanently seal the wire from
corrosion.
DEFINITIONS AND ABBREVIATIONS
Throttle Position Defi nitions
Heavy Throttle:
Approximately 75% of accelerator
pedal travel
Light Throttle:
Approximately 25% of accelerator pedal
travel
Medium Throttle:
Approximately 50% of accelerator
