This factory service and repair manual for the 1990 Ford LTA9000 covers six diesels in a medium-conventional tractor truck, Base trim. Two of the engines are new to the list, the 10.3L six-cylinder (629 cu in) and the turbocharged, aftercooled 11.1L inline-six (677 cu in), alongside the 10.5L six-cylinder (638 cu in) and the turbocharged 10.0L (611 cu in), 14.6L (893 cu in) and 14.0L (855 cu in) inline-sixes. With the low-tilt cab absent this year, the tractor chassis is a constant, and the procedures, specifications, torque values, wiring diagrams and diagnostics of the 1990 manual turn mainly on which of the six engines is fitted.
Engines covered
- 10.5L six-cylinder (638 cu in) — diesel
- 10.0L inline-six (611 cu in) — turbocharged, diesel
- 14.6L inline-six (893 cu in) — turbocharged, diesel
- 14.0L inline-six (855 cu in) — turbocharged, diesel
- 10.3L six-cylinder (629 cu in) — diesel
- 11.1L inline-six (677 cu in) — turbocharged, aftercooled, diesel
Body styles covered
- Tractor truck, medium conventional
Trims covered
- Base
Known issues on the 1990 LTA9000. The 1990 LTA9000 carries one recall on federal record, for the air brake system. Its subject is the secondary service reservoir, whose air check valves may fail to seat because a brass guide interferes with the wall of a cylindrical ferrule. No owner complaints are logged with NHTSA for the 1990 truck. The manual's procedures, specifications, torque values, wiring diagrams and diagnostics cover that air system along with the six diesels, from the 10.3L six-cylinder to the aftercooled 11.1L, in the medium-conventional tractor.
SECONDARY SERVICE RESERVOIR AIR CHECK VALVES MAY NOT SEAT PROPERLY DUE TO A MECHANICAL INTERFERENCE CONDITION BETWEEN A CIRCULAR BRASS GUIDE AND THE WALL OF A CYLINDRICAL FERRULE I
