Rock transmission gears by hand to get feel for gear backlash. 15 mm.–.30 mm.) between the PTO input gear and the transmission drive gear. Before installing the PTO, the installer should be familiar with the unit’s backlash. Open PTO box to inspect the unit and make sure you have all the mounting hardware.Ĩ. It is recommended to also clean the bolt holes. When the PTO cover is off, prepare to clean the mounting surface by placing a clean shop towel on the opening to eliminate debris from going into the transmission. Check the mounting surface of the transmission and the PTO drive gear in the transmission for anything that could cause problems (nicks or burrs).Ħ. Then, while under the truck, remove the cover plate, and inspect the drive gear for correct backlash manufactured into transmission gear sets.ĥ. For automatic transmissions, do not drain fluid, but be prepared for some seepage.Ĥ. For manual transmissions, drain the transmission fluid. Make sure engine is off and remove keys.ģ. Before installation, listen to the engine and transmission while it is running, so you can distinguish any unusual sounds.Ģ. Many problems can be avoided by exercising extreme care during the installation procedure.įollow instructions as to where warning and safety labels are to be placed and review the following steps before starting the installation process:ġ. A 10-bolt opening is exclusive to automatic transmissions manufactured by Allison, Caterpillar, and Ford. These openings refer to the number of fasteners used to attach the PTO to the transmission. The Society of Automotive Engineers (SAE) has set the standard for 6-bolt and 8-bolt patterns, and there are also non-standard 6-bolt and 10-bolt patterns. Using the PTO on an Allison Automatic Transmission provides greater vehicle utilisation options, pump and roll (live drive), increased efficiency and more power to get the job done, when it counts.The majority of power take-offs (PTOs) used today in the North American market are on the side or bottom opening. The drivers capacity to turn on the PTO can be limited if the engine RPM is high, which could cause damage to the PTO, transmission or the hydraulic components. 1st neutral and reverse or just neutral or any specified range) Operators can use the gear indicator with the PTO function to limit the PTO operation to specific gear or gears (i.e. Pump and roll: With an Allison, the PTOs are driven directly by the engine, and they can operate whilst the vehicle is in motion, allowing specialised equipment to be activated when driving, and making operations such as pump and roll possible.Īllison programming functionality can be setup to protect the hydraulic components which can also equate to big dollar savings.įunctionality and safety features can be used to limit the PTO operation by adjusting road speed (calculated from the output RPM, diff ratio and tyre size) or engine RPM. Power take off: As the PTO drive gear is constantly driven by the engine, the Allison Transmission can provide continuous and higher power takeoff ratings than is possible with a manual or automated manual gearbox. The Allison Transmission Control Module (TCM) controls all basic PTO functions. In most Allison transmission models, the PTO drive gear is driven directly by the engine (live drive), while manual or automated manuals typically use output PTO provisions.Įase of integration: manual and automated manuals require a dedicated interface with the vehicle pneumatic system an Allison PTO engages directly via Allison transmission fluid pressure. This principle of operation means the power take off has the following values: The top side PTO option: has the PTO pads at approximately one o’clock and eight o’clock viewed from the rear of the transmission.Side-side PTO option: has PTO pads at approximately four o’clock and eight clock viewed from the rear of the transmission.PTO’s can be installed and operated as a single unit or in pairs, and the following configurations are possible: This equipment typically needs to take power from the engine to operate hydraulic or mechanical equipment, whilst the vehicle is moving.Īllison fully automatic transmissions are available with power take off (PTO) drive provisions in a variety of positions. Commercial vehicles such as refuse compactors, concrete agitators, tippers, fire truck pumpers, or a hydraulic crane arm often feature specialised equipment to perform specific tasks often use live drive Allison transmissions.
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