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Service Training
6.7
T20R type 140 with LDC ................................................................................................... 49
6.7.1
T20R: Operating the truck ................................................................................................. 50
6.7.2
T20R: Location of the speed control panel components (LDC) ......................................... 51
6.7.3
T20R: status of LDC control box inputs ............................................................................ 52
6.7.4
T20R: LDC speed control adjustments (Eprom 1.5) ......................................................... 53
6.7.5
T20R: truck coding ............................................................................................................ 53
6.7.6
T20R: accelerator .............................................................................................................. 54
6.7.7
T20R: the brake box 7A4 .................................................................................................. 55
6.8
T20S type 144 with LDC ................................................................................................... 56
6.8.1
T20S: Operating the truck ................................................................................................. 57
6.8.2
T20S: Location of the speed control panel components (LDC) ......................................... 58
6.8.3
T20S: status of LDC control box inputs ............................................................................. 59
6.8.4
T20S: LDC speed control adjustments (Eprom 1.5) .......................................................... 60
6.8.5
T20S: truck coding ............................................................................................................ 60
6.8.6
T20S: accelerator .............................................................................................................. 61
6.9
T20S - T20R: Speed sensor adjustment and control ........................................................ 62
6.10
Using control units for LDC speed control (Eprom 1.5) ..................................................... 63
6.10.1
Diagnostic menus .............................................................................................................. 64
6.10.2
Troubleshooting ................................................................................................................. 70
6.10.3
Error codes displayed in the menus (2), (3), (31) and servicing ....................................... 73
6.10.4
Truck faults correspondence - Error messages ................................................................ 76
6.10.5
Table of faults in the power circuit ..................................................................................... 78
6.11
Braking .............................................................................................................................. 79
6.11.1
Electromagnetic brake control, DIGISOFT ....................................................................... 79
6.11.2
Electromagnetic brake control, MODITORQUE ............................................................... 81
6.11.3
Electrohydraulic brake control ........................................................................................... 83
6.12
Electrical steering LES ...................................................................................................... 84
6.12.1
T20S - T20R: LES electric steering description ................................................................ 85
6.12.2
LES steering operation ...................................................................................................... 86
6.12.3
Setting the wheel position potentiometers ......................................................................... 87
6.12.4
LES steering adjustment ................................................................................................... 88
6.12.5
Diagnostic adjustment equipment ...................................................................................... 88
6.12.6
Adjustment procedures ..................................................................................................... 88
6.12.6.1
Replacing the position potentiometers ............................................................................... 89
6.12.6.2
Teaching the steer after replacing the control box 3A1 ..................................................... 91
6.12.7
Using control units for LES speed control ......................................................................... 93
6.12.8
Troubleshooting with the TEST MODULE unit or PC ...................................................... 101
Contents
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