Do not adjust backlash by noise alone, always visually check backlash and use a dial indicator.A PTO will not always make these noises.Afterward, repeat this test with PTO engaged. A clatter noise indicates the PTO is mounted too loose, so it would require removing a gasket stop the engine, repeat the process using a dial indicator to check your backlash, and remove a gasket. ![]() A whine noise that elevates with the RPM indicates a PTO is mounted too tight, which would require an additional gasket stop the engine, repeat the process using a dial indicator to check your backlash, and add a gasket. Beware and stay clear of any rotating components. Keep the PTO and transmission running time as short as possible until transmission is refilled with transmission fluid.ġ7. Start the truck engine (with PTO and transmission in neutral) for only a few seconds and listen for any unusual noises. Then, mount the PTO to the adapter with the correct gasket which you set aside.ġ6. Second, mount the adapter with proper backlash to the transmission. First, set correct backlash between adapter and PTO and set the gaskets aside. There may be a case where a gear adapter is required, remember backlash must bet set at two locations. Depending on the type of PTO used, place the shift cover or inspection plate on the PTO and torque nuts to specified requirements.ġ5. Torque all fasteners to the appropriate settings to eliminate possible leaks which could lead to PTO and or transmission damage.ġ4. A roper backlash cannot be attained, and you may need to adjust the amount of gasket or shims to achieve the proper backlash.ġ3. ![]() Note:Never use silicone type sealants on PTO the transmission mounting surface. Do not stack more than four gasket or shims together. Double check your mounting instructions as some newer transmissions (Allison and Fuller) have been designed with a controlled compression type gasket and a predetermined backlash, which is to eliminate the need to check backlash.ġ2. Place gasket or shim from your kit over the studs, a thin coat of transmission oil on gasket can help to hold into place during installation. Remove the shift cover or inspection cover plate from the PTO to rock input gear with transmission PTO drive gear to get the feel of backlash which is helpful when fitting PTO to transmission.ġ1. However, it is recommended that you check your installation manual for proper torque limits.ġ0. Typically this requires a torque limit of 30–35 lbs.ft. Install the studs until barrel of stud is even with transmission pad. Note: Before installing a PTO, use a dial indicator to check the backlash.ĩ. ![]() 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. The majority of power take-offs (PTOs) used today in the North American market are on the side or bottom opening.
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