Service Training
BW 156/177 D-3/PD-3
- G 16 -
BW 178/179 D-3/PD-3
Travel speed ranges
Depending on the position of the travel speed range (S42:23) the solenoid valves (Y30:19, Y31:29)
•
for both travel motors (drum and axle),
•
only for the front travel motor (drum),
•
only for the rear travel motor (axle),
•
or for none of the motors are supplied with current.
This enables the operator to influence the gradability of the machine by changing the displacement of
the travel motors. The motor of the slipping axle is switched over to low displacement.
If the travel speed range selector switch (S42:23) is in position 1 „turtle“, none of the solenoid valves
(Y30:11/Y31:18) is supplied with current. In this switch position all motors for drum and axle work with
high displacement. The machine drives with low travel speed range (working speed).
In switch position 2 current flows
•
from potential K11,
•
via fuse (F26:23),
•
switch (S42:23)
•
to solenoid valve (Y30:19).
The drum drive motor switches to low displacement.
The current flow to solenoid valve (Y31:29) is avoided by diode (V02:22).
In switch position 3 current flows
•
from potential K11,
•
via fuse (F26:23),
•
switch (S42:23)
•
to solenoid valve (Y31:29).
The axle drive motor switches to low displacement.
The current flow to solenoid valve (Y30:19) is avoided by diode (V03:27).
Summary of Contents for BW 156 D-3
Page 143: ...Service Training BW 156 177 D 3 PD 3 G 2 BW 178 179 D 3 PD 3 Supply Fig 1 Power supply...
Page 152: ...Service Training BW 156 177 D 3 PD 3 G 11 BW 178 179 D 3 PD 3 Brakes Fig 5 Brake...
Page 159: ...Service Training BW 156 177 D 3 PD 3 G 18 BW 178 179 D 3 PD 3 Vibration Fig 7 Vibration...
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