TRANSMISSION AUXILIARY 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. 2. ACCESS LATERAL DOOR ZF TRANSMISSION CONTROL MODULE

885b WITH fUNK TRANsMIssION

The Come-home is an emergency function, used in event of failure of the transmission control module. If the immediate replacement of the module is not possible, this function allows the driving of the machine to the nearest repair shop. The switch (14) on the instrument panel is a three-position switch: forward, neutral and reverse. To enable the system, turn off the machine, apply the parking brake and put the switch in the neutral position. Open the cover on the right hand side of the operator’s cab. This allows the access to two gray connectors and one black connector.

X23

X24 X23A

TRANSMISSION FUNK CONTROL MODULE CONNECTORS – COME-HOME NOT ACTIVATED

Disconnect the gray connectors, X23 and X23A. Connect the upper part of the X23 connector to the lower part of the X23A connector.

COME-HOME ACTIVATED

Close the side-cover, be sure the parking brake is applied, then start the engine. NOTe: After releasing the parking brake, select the desired driving direction (forward–reverse) through the COME-HOME switch on the instrument panel. Moving the COME-HOME switch to the “forward” position the system will select the second forward gear. Moving the COME-HOME switch to the “reverse” position, the system will select the first backup gear. After repairs, reconnect the connectors to their former positions.