LiuGong CLG835H, Service Manual

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8-77
January 24, 2017 Structure Function Principle
CLG835H Lighting system
Electronic control unit
As the core of the shift control system, the elec-
tronic control unit EST125 processes and oper-
ates the signals of operator-selected gear, speed
sensor, KD and engine shutoff. Whereby,
EST125 drives the solenoid valve group combi-
nation through outputting control signals, to
implement the gear selection and shift of trans-
mission. Besides, EST125 also outputs neutral
signals, to drive the gear/neutral interlock relay to
act when the DW-3 gear selector is in neutral
position. Output the reversing alarm signal and
drive the reversing alarm relay to work.
Shift selector
The internal part of a gear selector consists of
many mini switches. When the operator selects
gears and directions, the internal micro switch
works, and the changed gear and direction sig-
nals ultimately enter into the electronic control
unit EST125 through the connecting of harness.
Fault detection procedures of DW-3 shift
selector
1. Turn the digital multimeter to 200 Ω of Ω posi-
tion.
2. Move DW-3 gear selector to N1 position;
3. Test if only [B1, B3], [B1, AS], [B3, AS] are
pairwise energized;
4. Shift the gear selector to other appropriate
gears, and check the parallelism in accor-
dance with the gear logic diagram;
P18E00133
P18E00134
P18E00135
P18E00136
Gear positions