This comprehensive manual provides detailed instructions and guidance for performing preventive maintenance on the Allison Transmission HT 750DR, designed for heavy-duty trucks. It covers a wide range of procedures, ensuring the smooth and efficient operation of your equipment.

The manual begins by outlining the process of removing the transmission from the vehicle. This section includes detailed instructions on draining the transmission fluid, disconnecting controls, uncoupling the transmission from the driveline and engine, and removing mounting bolts. It also provides step-by-step instructions for removing the transmission itself, as well as the input and output flanges or yokes. Finally, it offers guidance on transmission rebuild and overhaul procedures.

Moving on, the manual then focuses on preparing the transmission for installation. This section covers procedures such as checking the flywheel for engine-mounted models, installing brake and output flanges, installing the input flange for remote-mounted transmissions, installing the range selector lever, installing a PTO (if applicable), installing the shift modulation control, and installing the oil filler tube.

Next, the manual explains how to prepare the vehicle for transmission installation. This includes checking the flexplate drive assembly for engine-mounted transmissions, checking input drive components for remote-mounted transmissions, inspecting the chassis and driveline, reviewing the oil cooler, oil filter, and lines, and verifying the functionality of controls.

The manual then focuses on the installation process, providing detailed instructions for handling the transmission, mounting it to the engine (for engine-mounted models), installing transmission mounting components, supporting the CLBT 750DB, coupling the transmission to the engine (for remote-mounted models), coupling the transmission to the driveline, connecting cooler and oil filter lines, connecting the range selector control, connecting the hydraulic retarder control (for CLBT models), connecting the modulator control, connecting power takeoff controls, connecting parking brake controls, connecting output disconnect controls (for dropbox models only), connecting the speedometer drive, installing temperature and pressure sensors and electrical components, and finally, filling the oil system.

The manual then dives into the intricacies of the oil system, covering aspects such as filling the system, the deep oil pan, oil pan interchangeability, spare parts information, installation of the 8 1/2 inch transmission oil pan assembly and oil filler tube, oil level and oil dipstick, checking the transmission oil level, oil specifications, oil change and filter replacement, oil operating temperatures, and oil level for the transfer gear housing (dropbox).

The manual also provides insights into dual mode operation, including a general description, functional operation, installation instructions, downshift inhibiting procedures for CL(B)T 750 models with dropboxes (operating at 2100 and 2300 rpm), and an explanation of the CLBT 750 dual mode transmission with a dropbox.

Furthermore, the manual offers information on the release of the step governor valve body assembly with part number 23010297, covering aspects such as general information, interchangeability, and spare parts information.

The manual also explores the application of manual/automatic operation on oil field equipment, covering general information, Mannesmann Rexroth Corporation shifters, Bennett shifters, preventive maintenance procedures for shifters, and the use of mode shift valves in Mannesmann Rexroth and Bennett systems.

Finally, the manual provides guidance on troubleshooting the CLBT 750 with dual mode, including information on pressure tap locations, troubleshooting dual mode circuitry, and the step governor valve.

This detailed and comprehensive manual serves as a valuable resource for technicians and owners alike, offering all the necessary information for proper maintenance, repair, and troubleshooting of the Allison Transmission HT 750DR.

The Allison Transmission HT 750DR is a robust and efficient automatic transmission designed for heavy-duty trucks operating in demanding environments. Primarily aimed at vocational applications like refuse collection, construction, and heavy-duty hauling, the HT 750DR showcases Allison's renowned reliability and durability. It is a fully electronic transmission with a sealed, isolated design that minimizes downtime and optimizes performance. The HT 750DR boasts a range of features specifically tailored for these demanding tasks, including a toughened planetary gearset, a robust output shaft, and an integrated retarder. This transmission also boasts a high torque capacity, enabling it to handle heavy loads and challenging terrains with ease. The HT 750DR's intelligent electronic controls provide precise gear selection, seamless acceleration, and efficient fuel consumption, optimizing the truck's performance in all operating conditions.

Beyond its robust design, the Allison HT 750DR boasts a number of innovative features that enhance its performance and efficiency. The transmission utilizes Allison's patented Continuous Power Technology (CPT), ensuring smooth and uninterrupted power delivery, even when shifting gears. The transmission also incorporates a sophisticated electronic control system that monitors and adjusts operating parameters in real time, optimizing performance and fuel economy. Furthermore, the HT 750DR is equipped with an integrated retarder, which provides exceptional braking power, aiding in vehicle control and reducing brake wear. Finally, the transmission is designed to be user-friendly, boasting a simple interface and convenient diagnostics, minimizing downtime and maximizing uptime. The combination of rugged construction, advanced features, and user-friendly design makes the Allison HT 750DR a top choice for heavy-duty trucking operators seeking a reliable and efficient transmission for their demanding applications.