The Allison Transmission 3000 MH Service Repair Manual is a comprehensive guide for servicing and repairing the Allison 3000 MH transmission. This factory manual provides detailed instructions and procedures for technicians and mechanics.

It covers a wide range of topics, including:

* **General Information:** This section provides an overview of the Allison 3000 MH transmission, including its design, operation, and specifications.
* **Description and Operation:** This section delves deeper into the transmission's components and their functions. You'll find information on the mounting, input drives, lockup clutch, torque converter, hydraulic retarder, power takeoff (PTO) drives, splitter clutches, gearing, high-range clutch, intermediate-range clutch, low-range clutch, reverse clutch, high-intermediate-range clutch, speedometer drive, parking brake, pan, strainer, input pressure and scavenge pump, housing, covers, and hydraulic system.
* **Preventive Maintenance:** This section covers essential maintenance tasks to ensure the long life and optimal performance of the transmission. It includes guidance on general inspection and care, transmission fluid levels, fluid cleanliness, recommendations for transmission fluid, fluid and filter change intervals, fluid contamination, transmission fluid and filter change procedures, breather, checking fluid temperatures and pressures, retarder valve linkage, external hydraulic lines and cooler, adjusting lockup speed, adjusting throttle sensor, adjusting parking brake, transmission stall test and cool down check, preservation and storage, lubrication of shift selector, troubleshooting the control system, checking and adjusting manual-electric control system, and checking and adjusting SPG-control automatic-electric system.
* **General Overhaul Information:** This section provides guidance on overhaul procedures, including information on procedures subject to change, welding procedures for electronic control equipment, removal of wiring harnesses and electrical components, removal of remote components, installation of external components, tools and equipment required, replacement parts, careful handling, cleaning, inspection, and assembly procedures.
* **Removal and Installation:** Learn how to safely remove and install the transmission, along with instructions on handling tight-fit flanges and determining PTO backlash limits.
* **Disassembly of Transmission:** This section covers the step-by-step process of disassembling the transmission, offering detailed instructions and illustrations.
* **Rebuild of Subassemblies:** The manual provides detailed instructions and illustrations for rebuilding various transmission subassemblies, including the SPG-control shift selector, SPG-control throttle potentiometer assembly, electronic control shift selector lever-type, electronic-control shift selector touch pad, electronic control unit (ECU) PROM replacement, parking brake assembly, hydraulic retarder control valve assembly, filter assembly, main-pressure regulator valve assembly, hydraulic lockup valve body assembly, SPG-control automatic-electric lockup solenoid, cover, and plate assembly, electric control lockup valve body, main-pressure transfer tube assembly, trimmer valve body assembly, trim boost valve body, low-range shift valve body and cover assembly, electronic-control valve body assembly, electric-shift main control valve body assembly, oil strainer assembly, oil pan assembly, input pressure, scavenge pump, and tube assembly, torque converter drive housing, flexplate assembly, flywheel assembly, stator assembly, torque converter pump and accessory drive gear assembly, retarder rotor (or hub) and torque converter turbine shaft assembly, torque converter housing assembly, input bearing retainer assembly, splitter-low clutch and drum assembly, splitter planetary carrier assembly, splitter ring gear and hub assembly, output bearing retainer assembly, transmission rear housing assembly, reverse planetary carrier assembly, high-intermediate range planetary carrier assembly, low-range planetary carrier assembly, intermediate-range planetary carrier assembly, intermediate-range sun gear and hub assembly, high-range clutch and drum assembly, transmission main housing assembly, and splitter shaft assembly.
* **Assembly of Transmission:** This section outlines the process of reassembling the transmission, providing detailed instructions and illustrations.
* **Wear Limits and Spring Data:** This section provides specific wear limits for various transmission components and spring data for proper replacement and maintenance.


The Allison Transmission 3000 MH Service Repair Manual is designed to be a comprehensive resource for technicians and mechanics who need to service and repair the Allison 3000 MH transmission. With its detailed instructions and clear illustrations, this manual is an essential tool for anyone working on this type of transmission.

The Allison Transmission 3000 MH is a robust and reliable automatic transmission designed for heavy-duty applications, specifically targeting medium-duty trucks and buses. This transmission utilizes a durable and efficient design, featuring a six-speed planetary gearset with a patented electronic control system. The 3000 MH is known for its smooth shifting, exceptional torque capacity, and fuel-efficient operation. It caters to a wide range of applications, including delivery trucks, refuse trucks, school buses, and transit buses. Its versatility and high performance have established it as a popular choice among commercial vehicle operators.

The 3000 MH's electronic control system provides exceptional flexibility in tailoring performance to specific applications. It offers several features that enhance driveability and efficiency. These include electronic shifting control, adaptive shift scheduling, and a range of transmission control modules (TCMs) to match individual vehicle needs. The 3000 MH also incorporates a robust cooling system to ensure reliable operation even under demanding conditions. Its high torque capacity and durable construction make it ideal for demanding applications requiring frequent heavy-duty operation. This transmission is designed to withstand the rigors of commercial use, demanding constant hauling of heavy loads and frequent stop-and-go traffic. It offers a significant advantage by reducing driver fatigue through its seamless shifting patterns and minimizing wear and tear on the drivetrain, ultimately contributing to lower operating costs and extended vehicle lifespan.