This 51-page Mechanic’s Tips manual is the official Allison HT CLT electronic control service guide for the HT, HTB, CLT, and CLBT 700 Series transmissions. It covers preventive maintenance, fluid specifications, transmission removal and installation, vehicle adaptation, and stall test procedures. Originally published March 1995 and revised April 1999, publication number MT1958EN.
Official Allison HT CLT electronic control document details
| Brand | Allison Transmission |
| Model coverage | HT 700 Series, HTB 700 Series, CLT 700 Series, CLBT 700 Series |
| System / Group | Electronic Control Transmissions |
| Publication no. | MT1958EN (also referenced as MT4108EN) |
| Year / Revision | March 1995; Revision 1, April 1999 |
| Pages | 51 |
| File size | 0.7 MB |
| Format | |
| Language | English |
Document table of contents
- Section I — Preventive Maintenance: periodic inspection, fluid level checks, fluid recommendations (DEXRON-III / Type C-4), fluid and filter change intervals, fluid temperatures, high-efficiency external filter change, contamination, auxiliary filter, breather, stall test and neutral cool-down check
- Section II — Removing Transmission from Vehicle: draining, disconnecting controls, uncoupling from driveline/engine/vehicle, removing input and output flanges or yokes, rebuild and overhaul instructions
- Section III — Preparing the Transmission for Installation: checking input components, installing output and input flanges for remote-mounted units, installing PTO, fill tube and seal, checking plugs and openings
- Section IV — Preparing Vehicle for Transmission Installation: engine-transmission adaptation requirements, checking flexplate drive assembly, checking input drive components for remote-mounted transmissions, chassis and driveline inspection, cooler/filter/lines, checking controls
- Section V — Installing Transmission into Vehicle: handling, mounting to engine, mounting components, coupling to driveline, connecting input and output retarder control, PTO controls, parking brake control, connecting cooler and filter, installing auxiliary filter
- Section VII — Service Literature: lists of related service manuals (SM2004EN, SM1314EN), parts catalogs (PC1965EN, PC1993EN), troubleshooting manual TS2712EN, and operator’s manual OM1957EN
Applicable truck models
This manual applies to all vehicles equipped with Allison HT CLT electronic control transmissions in the 700 Series family — specifically the HT 700, HTB 700, CLT 700, and CLBT 700. The HTB models include a hydraulic output retarder. Fluid recommendations distinguish between light-duty applications (DEXRON-III) and severe-duty applications (Type C-4). The stall test and neutral cool-down check procedures help diagnose slipping clutches, cavitation, torque converter failure, or freewheeling stator conditions. For additional technical resources, visit Allison Transmission official site.
Who needs this Allison HT CLT electronic control manual
Fleet mechanics, workshop owners, and transmission rebuilders servicing heavy-duty trucks with 700 Series Allison automatic transmissions will find this document essential. It provides step-by-step guidance for preventive maintenance intervals, correct fluid selection, safe removal and reinstallation, and diagnostic stall testing.
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