TORA

General Rules for PTO Installation

P.D. 11.07.2025

• Use the appropriate tools and instruments such as torque wrenches, gauges, and thickness gauges.


• Use only gaskets supplied by the manufacturer. Use paste gasket only if recommended.


• Mastic is forbidden if used together with paper gaskets.


• It is advisable to use medium thread locking fluid for locking bolts and studs.


• Perform all installation operations with the vehicle standing on a level surface; otherwise, oil levels cannot be checked.


• Operate with engine and gearbox at ambient temperature.


• Check that the PTO is equipped with the correct mounting kit.

Allison PTO Mounting

Tightening Torque

PTO Installation

For some aluminum gearboxes, the tightening torque needs to be reduced by 30%. Note on the tightening torque: the tightening torques reported are only meant as a guide and do not replace the indications given by the vehicle’s manufacturer or the gearbox manufacturer.

Safety Information

• Carefully read the user manual provided and take notice of the instructions indicated.

• The important sections for operator safety and a prolonged product life are marked with symbols. Take notice of such symbols.

• Never work alone when doing repair or maintenance work under the vehicle.

• Make sure to check if the instructions you follow and the tools you use are intended for the work you are engaging in.

• Never use worn or damaged parts.

• Do not attempt any modification on the PTO or any other drive components of the vehicle.

• Ensure to mount the parts properly.

• Check backlash when the engine is stopped.

• Do not go under the truck when the engine is running.

Allison Power Take OFF

Instructions for Operation in Cold Weather

The disengaged PTO might transmit high levels of instant torque in cold weather (0°C and below), leading to rotation on the output shaft. This motion might result in injuries or damage to the PTO.

For prevention of injuries and damage to the equipment:

• Check the drive components of the vehicle.

• Do not attempt to use drive components without warming up the vehicle.

Allison PTO