CHAPTER 8 – ELECTRICAL SYSTEM
TRANSMISSION AUXILIARY SYSTEM
Limp-Home (LF and LR)
845B and 865B Models with ZF transmission The Limp-Home is a safety operation mode that permits the operator to move the machine in case of a failure on the transmission control system. If a failure occurs, the transmission can operate on one forward or reverse gear only. In some cases, depending on the density of the failure, operation will be possible on one direction only. If a failure occurs, the Transmission Control Unit (TCU) will select automatically the Neutral position. The operator should maintain the engine running at low idle (or below 1600 rpm), put the selector lever in Neutral position, decrease the speed of the machine to a value lower than the gears engagement limit 4,0 km/h (2.5 mph) and select “F” or “R”, depending on the operation requirement. After the speed decrease, when forward or reverse is selected, the Limp-Home gear will be engaged. If the operator desires to alter the travel direction of the machine to the Limp-Home condition, he can just change the selector lever from “F” to “R” or vice versa, since the speed is lower than the limit of the gears engagement. If the speed is higher than this limit, the operator must decrease the speed, put the selector lever again in Neutral and select the desired direction.
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1 1. Access Lateral Door 2. ZF Transmission Control Module
