Vestil S-xxx-FF - Manual (Page 22)

22
Problem: Possible cause(s): Action:
Unit will not reverse; belly switch
does not function; forward ok Broken wire, or loose connection,
bad throttle assembly, bad motor
controller.
Locate Pin 12 on Molex connector at
the motor controller. Try to drive
the unit in reverse; there should be
24 volts at this pin. If there is
voltage and the unit does not move,
the motor controller may be bad,
consult factory. If there is no
voltage, trace the wiring back
towards the tiller head and check
voltage on each side of connectors.
Continue this until bad connection
is found. If the connections are all
good, and there is no voltage
coming out of throttle assembly,
then the throttle assembly may be
bad. Verify there is 24 volts going
into the assembly and that there is
a good ground. If there is still no
output voltage for pin 12, replace
throttle assembly.
Lifting height is not longer achieved
Hydraulic oil level is too low
Re-fill hydraulic oil when forks are
lowered.
Unit jerks when lifting
Air in the system
Open vent screw on the lift cylinder
with forks lowered all the way down.
Lift forks with vent screw open until
oil is free from air bubbles. Close the
vent screw
Forks raise, then drift down
Check valve or Solenoid valve leaking
(contamination holding open the
lowering valve or the check valve)
Remove & inspect.
. Remove any load from the forks.
. Remove the nut holding solenoid coil
on the valve stem, and then unscrew
the valve from the manifold.
. Inspect the valve for contaminants,
and the valve’s o-rings and back –up
washers for cuts, tears, and other
damage.
. With valve immersed in mineral
spirits or kerosene, use a thin tool
such as a small screwdriver or a small
hex wrench to push the poppet in and
out several times from the bottom
end of the valve. The valve should
move freely, about 1/16” from closed
to open position. If it sticks in, the
valve stem could be bent and will
need to be replaced if it doesn’t free
up after cleaning. Blow the valve off
with a compressed-air gun while again
pushing the poppet in and out.