398 Lifting Arms
8 b. Activate the in/out function by moving the joystick in one direction, then the other.
The further away the joystick is from its neutral position, the faster the arm moves.
When you move the joystick to the maximum in one direction, the signal voltage should be
either 3V or 9V. If it is 3V in one direction, it would be 9V in the other. The speed by which
the arm moves when the joystick is pushed to the fullest is the same, no matter which
direction the arm travels.
When the joystick gets closer to its neutral position, the arm slows down and when it
returns to its neutral position, the arm stops completely (see Figure 10-22).
The proportional signal is faulty when one of the following occurs: voltage is lower than 3V, higher
than 9V, no voltage at all or it is unstable.
If the signal voltage is lower than 3V the cause may be electrical: broken wire, faulty PWM adapter
(see Figure 10-25), corroded/damaged connector (see Figure 10-25), defective arm-controlling
module or mechanical: faulty coil, improperly adjusted hydraulic pressures, hydraulic bypass,
pinched lines, out-of-spec hydraulic requirements.
Figure 10-23
Testing voltage with a multimeter
Figure 10-24
Identifying wires on coil
12V Wire
Signal Wire
Ground Wire
First test
Second test
Ground Wire =
105B
12V Wire =
806Ao, 806Bo
Signal Wire =
807B, 811B
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