Short Description
The specifications and designs described herein are believed to be correct as of the time that this book was approved for printing, but accuracy cannot be guaranteed. They are intended only to provide basic data regarding such matters as dimensions and weight ratings of Fordbuilt chassis. The information contained in this book is general and nothing contained herein is to be regarded as providing specific or comprehensive instructions for the completion of a particular vehicle or as authorization by Ford of the specific modifications, alteration or designs of individual vehicles.
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Content
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To minimize the risk of transmission damage, PTO controls must be integrated into the vehicle wiring.
PTO Request - Applying vehicle battery voltage to the “PTO Request” wire will (1) place the transmission in PTO mode and
(2) elevate idle engine idle speed when certain conditions (described below) are met. This wire MUST be part of the PTO
control system; failing to do so may result in under capacity PTO clutch wear, resulting in rapid contamination of
transmission fluid and internal transmission damage.
Remote PTO Enable - One of the two available remote PTO engine wires MUST also be part of the PTO control system.
The wire must be connected to the PTO Request circuit.
PTO Enable - An output wire is available that indicates when the elevated idle is active. The “PTO Enable” output may be
used at the body builder’s discretion; for example, to restrict PTO operation to stationary only.
PTO Engaged - An input wire is available to control the PTO lamp in the instrument cluster. Applying vehicle battery voltage
to the “PTO Engaged” wire will illuminate the PTO lamp.
“PTO Request”, “PTO Enable”, “PTO Engaged”, and the remote engine PTO signals are blunt cut wires supplied with the
vehicle and are located behind the cab on the left frame rail near the transmission. All other PTO components are to be
supplied by the body builder.
Elevated Idle Operation - When (1) the “PTO Request” input transistions from open circuit to vehicle battery voltage and
(2) the conditions in Table 1 are met, the engine will ramp to 1200 RPM and the “PTO Enable” output will be activated.
While in this mode, normal engine speed hand controls are available; however, the engine will maintain an engine speed
between 1200 and 2400 RPM. The engine will remain in this mode until either (1) the “PTO Request” input is open circuit or
(2) one or more of the conditions in Table 1 are no longer met.
NOTE: A “change-of-state” at the “PTO Request” input is required to re-invoke the elevated idle mode. The operator must
turn off voltage to the “PTO Request” input, and back on again.
Engine Programming - The engine programmable parameter “PTO-CONTROL” must be set to either “1: REMOTE
OPERATION ONLY” or “3: REMOTE AND IN-CAB OPERATION” for PTO installations. This parameter is set to “3:
REMOTE AND IN-CAB OPERATION” from the factory.
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