15-09-2021

Allison Ht740 Service Manual

HT740, 750, 754 HD4560/B500 730V Drive OFF HIGHWAY CT/CLT/CRT3000 (3340/3461) TT2000/3000 /4000 CLBT4000 (4460/HT70) CLBT5000/6000/8000 MARINE M/MH (M10/M45) MISCELLANEOUS Governor Application Chart Allison Shipping Plugs Heavy Duty Coolers & Cooler Selection Chart Heat Exchangers Service Manuals, Parts Catalogs Reference Number to Transtar. Proper service and repair is important to the safe, reliable operation of the equipment. The service procedures recommended by Allison Transmission and described in this handbook are effective methods for performing service operations. Some of these service operations require the use of tools specially designed for the purpose. Regular fluid and filter maintenance is the simplest thing you can do ensure the performance and durability of your Allison fully automatic transmission. While operating conditions may require more or less frequent fluid change intervals, we have designed extensive specifications and testing programs to ensure our recommendations closely match.

Allison

Suprman

Well-known member
Location
Stratford/Connecticut

Allison Ht740 Transmission Problems

I have a few Allison transmissions. They were intended for Oshkosh Hemtt use. They have a 24 bolt bell housing with approx 21 inch diameter pattern. Some are stamped HT740 and some are stamped HT740D. Both types have the same part number 23014539. The crates are all stamped with nsn 2520-01-257-3880. I called Allison, they said the part number is a standard HT740 4-speed automatic trans. Allison said they do not make a 740D, they make a 750DR which is a 5-speed with the first gear being very low. Some of the 740D's are rebuilt by Inland Detroit-Allison so I called them and they said yup its a 740D but couldnt give me any other info. Inland said the torque converter is a 498 type. Does anyone know is there is any difference between the two types and if there is a difference between the civ HT740 and the Hemmt HT740?
Thanks
Will