Allison Transmission HT750 PREVENTIVE Maintenance Manual

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🏷️ Basic Information Identification Make: Allison Transmission Model: HT750 Transmission Type: Heavy-Duty Automatic Transmission Manual Product Name: Allison Transmission HT750 PREVENTIVE Maintenance Manual Product Description Summary: Complete official full preventive maintenance manual for the Allison Transmission HT750, emphasizing proper service for safe and reliable operation. Codes Primary Model Code: HT750 Generation Transmission Generation Type: Represents a robust, mechanically controlled (with potential electronic overlays) generation of heavy-duty automatic transmissions. 👋 Introduction Market Position Market Position: The Allison HT750 is a robust, heavy-duty automatic transmission typically found in vocational, construction, and specialized vehicles. Its reputation is built on durability and reliability in demanding applications. Target Audience: Fleet maintenance technicians, heavy equipment mechanics, owner-operators, and service departments responsible for the upkeep and repair of vehicles equipped with Allison HT750 transmissions. Key Application Sectors: Construction, mining, waste management, logging, vocational trucks, and other heavy-duty vehicle segments where reliability and durability are paramount. Key Features Key Features: Designed for high torque capacity and sustained operation in challenging environments. Features like Dual Mode operation (on CLBT models) and PTO integration enhance versatility. The manual focuses on ensuring the longevity of these core attributes through proper maintenance. Use Of Special Tools: The manual highlights that 'Some of these service operations require the use of tools specially designed for the purpose. The special tools should be used when and as recommended,' underscoring the need for proper tooling for service. Competitive Analysis Competitive Advantages: As an official Allison manual, it provides manufacturer-recommended procedures, ensuring accuracy and adherence to quality standards, which is critical for maintaining warranty and performance of these heavy-duty units. 📋 Manual Details Coverage Areas Coverage Areas: Preventive Maintenance, Removal, Installation, Oil System, Dual Mode Operation, Troubleshooting, Specific Valve Body Assemblies, Manual/Automatic Operation in Oil Field Equipment Specific Sections Covered: I: Removing Transmission from Vehicle, II: Preparing Transmission for Installation, III: Preparing Vehicle for Transmission Installation, IV: Installing Transmission into Vehicle, V: Oil System, VI: Dual Mode Operation, VII: Release of Step Governor Valve Body Assembly P/N 23010297, VIII: Manual/Automatic Operation on Oil Field Equipment, IX: Troubleshooting CLBT 750 with Dual Mode Specialized Applications: Section VIII covers 'Manual/Automatic Operation on Oil Field Equipment,' detailing specific shifter systems and their maintenance, highlighting the transmission's use in specialized industries. Part Number Specific Coverage: Specific coverage for 'Step Governor Valve Body Assembly P/N 23010297' indicates focus on critical, replaceable sub-assemblies. Page Count Page Count: Not Specified (Digital Download) Manual Type Manual Type: Preventive Maintenance Manual Language Language: English Format Format: PDF (Digital Download) 📖 Manual Coverage Systems Covered Systems Covered: Transmission Removal/Installation, Oil System (pan, cooler, filter, lines, filling), Dual Mode Operation, Control Systems (range selector, modulator, PTO, parking brake, retarder, output disconnect), Governor Valve Body, Shifter Systems (Mannesmann Rexroth, Bennett) Specific Systems Detailed: Flywheel, Flexplate, Input/Output Flanges, Brake, PTO, Range Selector Lever, Shift Modulation Control, Oil Cooler, Oil Filter, Lines, Controls (Selectors, Modulator, PTO, Parking Brake, Retarder), Speedometer Drive, Temperature and Pressure Sensors, Electrical Components, Step Governor Valve Body Assembly, Shifters (Mannesmann Rexroth, Bennett) Chassis Driveline Checks: Section III includes 'Checking Chassis And Driveline,' demonstrating a holistic approach to installation preparation beyond just the transmission itself. Engine Mounting Considerations: Distinguishes between 'Transmission Engine-Mounted' and 'Transmission Remote-Mounted' scenarios, covering unique preparation and installation steps for each. Procedures Included Procedures Included: Draining, Disconnecting Controls, Uncoupling from Driveline/Engine, Removing/Installing Mounting Bolts, Removing/Installing Flanges/Yokes, Rebuild/Overhaul (general guidance), Preparing Transmission for Installation, Checking Flywheel/Flexplate, Installing Brake/Output Flange, Installing Input Flange, Installing Range Selector Lever, Installing PTO, Installing Shift Modulation Control, Installing Oil Filler Tube, Preparing Vehicle for Installation, Checking Drive Components, Checking Chassis/Driveline, Checking Oil Cooler/Filter/Lines, Checking Controls, Handling, Mounting to Engine, Installing Mounting Components, Rear Support (CLBT 750DB), Coupling to Engine, Coupling to Driveline, Connecting Controls (various), Filling Oil System, Checking Oil Level, Oil Change and Filter Replacement, Troubleshooting Dual Mode Circuitry, Preventive Maintenance on Shifters Rebuild Overhaul Instructions: The manual explicitly mentions 'Rebuild/Overhaul Instructions' as part of Section I, indicating it provides guidance on internal component servicing beyond basic maintenance, though the depth may vary from a full rebuild manual. Pto Installation: Installation of PTO is covered in Section II, and connection of PTO controls is in Section IV, confirming comprehensive guidance for this common heavy-duty feature. Brake And Flange Installation: Detailed procedures for installing the brake and output flange, as well as the input flange, are included in Section II. Technical Depth Technical Depth: Comprehensive. Covers removal, installation, and key maintenance aspects, including specialized operation modes and troubleshooting for specific configurations. Offers detailed procedures for servicing the oil system and controls. Diagnostic Capability: Includes a dedicated troubleshooting section for CLBT 750 models with Dual Mode, focusing on circuitries and the Step Governor Valve. This suggests a level of diagnostic support beyond routine checks. 📊 Manual Specifications File Format File Format: PDF File Accessibility: Instant digital download upon purchase, with 'NO waiting!'...

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Description

🏷️ Basic Information

Identification

Make:

Allison Transmission

Model:

HT750

Transmission Type:

Heavy-Duty Automatic Transmission

Manual Product Name:

Allison Transmission HT750 PREVENTIVE Maintenance Manual

Product Description Summary:

Complete official full preventive maintenance manual for the Allison Transmission HT750, emphasizing proper service for safe and reliable operation.

Codes

Primary Model Code:

HT750

Generation

Transmission Generation Type:

Represents a robust, mechanically controlled (with potential electronic overlays) generation of heavy-duty automatic transmissions.

👋 Introduction

Market Position

Market Position:

The Allison HT750 is a robust, heavy-duty automatic transmission typically found in vocational, construction, and specialized vehicles. Its reputation is built on durability and reliability in demanding applications.

Target Audience:

Fleet maintenance technicians, heavy equipment mechanics, owner-operators, and service departments responsible for the upkeep and repair of vehicles equipped with Allison HT750 transmissions.

Key Application Sectors:

Construction, mining, waste management, logging, vocational trucks, and other heavy-duty vehicle segments where reliability and durability are paramount.

Key Features

Key Features:

Designed for high torque capacity and sustained operation in challenging environments. Features like Dual Mode operation (on CLBT models) and PTO integration enhance versatility. The manual focuses on ensuring the longevity of these core attributes through proper maintenance.

Use Of Special Tools:

The manual highlights that 'Some of these service operations require the use of tools specially designed for the purpose. The special tools should be used when and as recommended,' underscoring the need for proper tooling for service.

Competitive Analysis

Competitive Advantages:

As an official Allison manual, it provides manufacturer-recommended procedures, ensuring accuracy and adherence to quality standards, which is critical for maintaining warranty and performance of these heavy-duty units.

📋 Manual Details

Coverage Areas

Coverage Areas:

Preventive Maintenance, Removal, Installation, Oil System, Dual Mode Operation, Troubleshooting, Specific Valve Body Assemblies, Manual/Automatic Operation in Oil Field Equipment

Specific Sections Covered:

I: Removing Transmission from Vehicle, II: Preparing Transmission for Installation, III: Preparing Vehicle for Transmission Installation, IV: Installing Transmission into Vehicle, V: Oil System, VI: Dual Mode Operation, VII: Release of Step Governor Valve Body Assembly P/N 23010297, VIII: Manual/Automatic Operation on Oil Field Equipment, IX: Troubleshooting CLBT 750 with Dual Mode

Specialized Applications:

Section VIII covers 'Manual/Automatic Operation on Oil Field Equipment,' detailing specific shifter systems and their maintenance, highlighting the transmission's use in specialized industries.

Part Number Specific Coverage:

Specific coverage for 'Step Governor Valve Body Assembly P/N 23010297' indicates focus on critical, replaceable sub-assemblies.

Page Count

Page Count:

Not Specified (Digital Download)

Manual Type

Manual Type:

Preventive Maintenance Manual

Language

Language:

English

Format

Format:

PDF (Digital Download)

📖 Manual Coverage

Systems Covered

Systems Covered:

Transmission Removal/Installation, Oil System (pan, cooler, filter, lines, filling), Dual Mode Operation, Control Systems (range selector, modulator, PTO, parking brake, retarder, output disconnect), Governor Valve Body, Shifter Systems (Mannesmann Rexroth, Bennett)

Specific Systems Detailed:

Flywheel, Flexplate, Input/Output Flanges, Brake, PTO, Range Selector Lever, Shift Modulation Control, Oil Cooler, Oil Filter, Lines, Controls (Selectors, Modulator, PTO, Parking Brake, Retarder), Speedometer Drive, Temperature and Pressure Sensors, Electrical Components, Step Governor Valve Body Assembly, Shifters (Mannesmann Rexroth, Bennett)

Chassis Driveline Checks:

Section III includes 'Checking Chassis And Driveline,' demonstrating a holistic approach to installation preparation beyond just the transmission itself.

Engine Mounting Considerations:

Distinguishes between 'Transmission Engine-Mounted' and 'Transmission Remote-Mounted' scenarios, covering unique preparation and installation steps for each.

Procedures Included

Procedures Included:

Draining, Disconnecting Controls, Uncoupling from Driveline/Engine, Removing/Installing Mounting Bolts, Removing/Installing Flanges/Yokes, Rebuild/Overhaul (general guidance), Preparing Transmission for Installation, Checking Flywheel/Flexplate, Installing Brake/Output Flange, Installing Input Flange, Installing Range Selector Lever, Installing PTO, Installing Shift Modulation Control, Installing Oil Filler Tube, Preparing Vehicle for Installation, Checking Drive Components, Checking Chassis/Driveline, Checking Oil Cooler/Filter/Lines, Checking Controls, Handling, Mounting to Engine, Installing Mounting Components, Rear Support (CLBT 750DB), Coupling to Engine, Coupling to Driveline, Connecting Controls (various), Filling Oil System, Checking Oil Level, Oil Change and Filter Replacement, Troubleshooting Dual Mode Circuitry, Preventive Maintenance on Shifters

Rebuild Overhaul Instructions:

The manual explicitly mentions 'Rebuild/Overhaul Instructions' as part of Section I, indicating it provides guidance on internal component servicing beyond basic maintenance, though the depth may vary from a full rebuild manual.

Pto Installation:

Installation of PTO is covered in Section II, and connection of PTO controls is in Section IV, confirming comprehensive guidance for this common heavy-duty feature.

Brake And Flange Installation:

Detailed procedures for installing the brake and output flange, as well as the input flange, are included in Section II.

Technical Depth

Technical Depth:

Comprehensive. Covers removal, installation, and key maintenance aspects, including specialized operation modes and troubleshooting for specific configurations. Offers detailed procedures for servicing the oil system and controls.

Diagnostic Capability:

Includes a dedicated troubleshooting section for CLBT 750 models with Dual Mode, focusing on circuitries and the Step Governor Valve. This suggests a level of diagnostic support beyond routine checks.

📊 Manual Specifications

File Format

File Format:

File Accessibility:

Instant digital download upon purchase, with 'NO waiting!' emphasized.

Download Benefit:

Provides immediate access for repairs, eliminating shipping fees and delays.

File Type:

PDF Document

Compatibility

Compatibility:

All Versions of Windows & Mac

Requirements

Requirements:

Adobe PDF Reader

Print Quality

Print Quality:

Digital - Resolution dependent on original source and PDF conversion.

Binding Type

Binding Type:

N/A (Digital Download)

Paper Type

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

Primary Engine

Primary Engine Application:

The HT750 is designed to be paired with a wide range of heavy-duty diesel engines from various manufacturers, typically in the 150-300 horsepower range, depending on the specific vehicle application and engine tuning.

Performance

Engine Horsepower Range:

The HT750 is typically rated for engines in the 150-300 horsepower range, but its suitability is also determined by torque and the specific application's duty cycle.

Fuel System

Fuel Type Compatibility:

Designed for diesel engines, as is typical for heavy-duty transmissions of this era and type.

🔧 Transmission

Standard

Standard Transmission Features:

Heavy-duty automatic, torque converter driven, typically with 5 or 6 forward gears. Variants exist, including those with PTO, hydraulic retarders, and specialized control systems for off-highway use.

Optional

Optional Transmission Features:

CLBT 750 models often incorporate a "Dual Mode" feature, offering enhanced performance characteristics for specific operating conditions. Availability of PTO, retarders, and specific control linkages varies by vehicle application.

Features

Specific Features Covered:

Dual Mode Operation (CLBT models), hydraulic retarder control, Power Takeoff (PTO) integration, range selector lever, shift modulation control, step governor valve body assembly P/N 23010297, deep oil pan options.

Hydraulic Retarder:

The manual covers connecting the Hydraulic Retarder Control specifically for CLBT Models, indicating this is a notable feature of certain HT750 variants.

Control Systems Interface:

Extensive coverage on connecting various control systems: Range Selector Control, Hydraulic Retarder Control, Modulator Control, Power Takeoff Controls, Parking Brake Controls, Output Disconnect Controls, and Speedometer Drive.

📐 Dimensions

Weights

Approximate Transmission Weight:

Typically ranges from 500 to 700 lbs (227 to 318 kg), depending on configuration (e.g., presence of PTO, retarder, deep pan).

Weight Considerations:

The manual addresses 'Handling' in Section IV, implying the weight and size of the transmission require specific lifting and maneuvering procedures, likely involving specialized equipment.

Exterior

Physical Size Implications:

The complexity of removal and installation procedures (Sections I & IV) suggests a substantial physical size and weight, requiring careful planning and execution.

💡 Technology Features

Driver Assistance

Driver Assistance Features:

While the HT750 is primarily a heavy-duty transmission, related vehicle systems might include speed sensors, pressure sensors, and control modules that interface with the transmission for optimal operation. The manual covers connecting these components.

Speedometer Drive Connection:

Section IV details 'Connecting Speedometer Drive,' indicating the manual covers the interface between the transmission and the vehicle's speed sensing system.

Connectivity

Connectivity Features:

The transmission may interface with vehicle diagnostics and monitoring systems via sensors for speed, temperature, and pressure. Electrical components and sensor installation are covered in the manual.

Infotainment

Infotainment Integration:

No direct infotainment features are covered, as this is a heavy-duty mechanical and hydraulic system. Focus is on operational technology and sensors.

🔧 Maintenance

Service Intervals

General Oil Change Interval:

Typically recommended every 30,000 to 60,000 miles or annually, whichever comes first. Specific intervals will depend on operating conditions, duty cycle, and Allison's recommendations for the specific application. Refer to manual for precise guidance.

Oil Operating Temperatures:

Section V dedicates an entry to 'Oil Operating Temperatures,' suggesting the manual provides guidance on monitoring and managing the transmission's thermal performance, which is critical for longevity.

Preventive Maintenance Focus:

The core purpose of the manual is preventive maintenance, ensuring the transmission operates reliably and efficiently by addressing potential issues before they become major failures.

Fluid Specifications

Transmission Fluid Type:

Allison TES 295 specification fluids are generally recommended. Common examples include Allison Transmission Fluid (ATF), Mobil Delvac 1 Synthetic ATF, Shell Spirax S4 ATF XYZ, or equivalent meeting TES 295 standards. Always verify with the manual or vehicle manufacturer.

Oil Specifications Detail:

Section V explicitly covers 'Oil Specifications,' indicating detailed information on approved fluid types and their properties will be provided.

Oil Pan Interchangeability:

Section V discusses 'Deep Oil Pan' and 'Oil Pan Interchangeability,' signifying that different oil pan configurations exist and the manual addresses their specific installation and fluid level considerations.

Oil Level Checking:

Detailed instructions are provided for checking transmission oil level, including information on the oil dipstick and its use.

Spare Parts Information:

Section V and VII mention 'Spare Parts Information,' suggesting the manual may offer guidance on identifying or ordering common replacement parts or sub-assemblies.

Fluid Capacity

Typical Oil Capacity:

Varies by oil pan configuration. Deep oil pans can increase capacity significantly. Standard capacity without a deep pan might be around 18-25 quarts (17-24 liters). Manual specifies for different pan types.

Filter Replacement

Filter Replacement Recommendation:

Recommended with every oil change. The manual likely details the location and procedure for replacing the transmission oil filter. Specific filter part numbers would be proprietary to Allison or its suppliers.

Known Issues

Common Maintenance Concerns:

Fluid leaks, overheating due to insufficient cooling or low fluid levels, wear of internal components (clutches, seals) from heavy use, and control system issues. Regular preventive maintenance as outlined in this manual is crucial to mitigate these.

Governor Valve Assembly Issues:

Section VII is dedicated to the 'Release of Step Governor Valve Body Assembly P/N 23010297,' implying potential service bulletins, interchangeability notes, or specific maintenance/troubleshooting related to this critical component.

Shifter Preventive Maintenance:

Section VIII specifically addresses 'Preventive Maintenance On Shifters,' indicating that the manual covers routine care for the transmission's engagement and selection mechanisms.

Torque Converter Interaction:

While not explicitly listed as a standalone section, the 'Uncoupling From Driveline And Engine' and 'Coupling To Engine' procedures imply interaction with the torque converter assembly.

📚 Vehicle History

Brand Heritage

Brand Heritage:

Allison Transmission is a renowned manufacturer of commercial and heavy-duty automatic transmissions, known for their robust engineering and reliability in demanding applications since the mid-20th century.

Model Evolution

Model Evolution:

The HT700 series, including the HT750, represents a lineage of proven heavy-duty automatic transmissions. Subsequent developments have focused on improved efficiency, electronic controls, and enhanced durability for evolving vehicle demands.

Model Variants Mentioned:

CLBT 750DB models are specifically mentioned regarding rear support and dual mode operation with Dropbox. This highlights the existence of specialized configurations.

Dropbox Models:

The manual specifically mentions 'Dropbox Models Only' for connecting Output Disconnect Controls and for Dual Mode Transmission with Dropbox, highlighting specific configurations.

Production

Production Period:

While specific production years for the HT750 variant are not provided, the series has been a staple in vocational and commercial vehicles for decades, indicating a long production run.

🏆 Awards & Recognition

Recognitions

Industry Recognition:

Allison Transmissions are widely recognized for their durability, reliability, and performance in commercial and industrial applications, often chosen by OEMs for their proven track record.