The definitive factory guide to the Volvo I-Shift transmission. Official Volvo Trucks North America Service Bulletin 431-03 “I-Shift Transmission — Design and Function”, release 4.2010 (replaces the 1.2008 edition). It explains how the I-Shift automated mechanical transmission is built and how it shifts, clutches and brakes its countershaft — the background knowledge behind every TCM fault code.
Document details
| Brand | Volvo Trucks North America |
| Model coverage | I-Shift AT2512C, ATO2512C, AT2612D, ATO2612D, AT2812C, ATO3112C, ATO3112D |
| System / Group | Group 431 — transmission, design and function |
| Publication no. | PV776-88949834 (SB 431-03) |
| Year / Revision | 4.2010, replaces 1.2008 |
| Pages | 38 |
| File size | 7.3 MB |
| Format | |
| Language | English |
Table of contents
- Transmission, Mechanical — general layout: splitter section, 3+1 main section, range section on a single countershaft
- 12 forward speeds, up to 4 reverse speeds depending on programming; two-pedal operation, no clutch pedal
- Countershaft brake gear meshing; single-disc automated clutch instead of a torque converter
- Air and electrical shift control: TCM-timed solenoids, dedicated air tank, control housing and clutch control valve
- Model specification tables — overall ratios 14.94:1 / 15.04:1, top ratio direct 1.00:1 or overdrive 0.78:1, weights 275-285 kg, matched engines D11 / D13 / D16
- Transmission identification — the two ID tags and version nomenclature
Applies to
Volvo VN, VT and VHD vocational trucks equipped with the I-Shift, paired with D11, D13 and D16 engines. See also the official Volvo Trucks site.
Who needs this Volvo I-Shift transmission manual
Transmission and electrical technicians diagnosing I-Shift shifting complaints, and anyone who wants to understand what the TCM is actually controlling before connecting a scan tool.
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