SLNM
, Manual
Copyright 201
5
Vestil Manufacturing Corp.
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of
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Problem:
Possible
cause(s):
Action:
Unit will not raise; motor does not
run
Loose wire
Bad solenoid
Upper limit switch out of
adjustment
Blown fuse
Verify
12
volts at coil when
raise is pushed, if no voltage,
trace wiring back to till her head
looking for voltage on each side
of the connectors until the bad
connection is found.
If voltage is present at the
solenoid and the unit does not
raise, remove the two wires to
the coil and measure the coil
resistance. It should be around
19 ohms. If it’s open, or shorted
replace the solenoid.
Bypass upper limit switch and
see if the unit raises…DO NOT
TAKE IT ALL THE WAY UP… If
it does raise, verify the limit
switch is normally closed and will
open when activated. If the limit
switch is ok, try to adjust the
switch accordingly so that the
units raise height is
approximately 7 to 8”
Unit will not raise; motor runs
Lower solenoid stuck on
Unit will not lower
Loose wire; bad coil
Upper limit switch out of
adjustment
Check fuses.
Check to see if the lowering
switch is stuck on.
R
eplace
switch, or tap on switch to see if
it can be freed up. If the lower
switch is not stuck “on,” the
pump could be bad, consult
factory.
Verify
12
volts at coil when lower
is pushed, if no voltage, trace
wiring back to
raise/lower
switches
looking for voltage on
each side of the connectors until
the bad connection is found.
If voltage is present at the coil
and the unit does not lower,
remove the connector to the coil
and measure the coil resistance.
It should be around 39 ohms. If
it’s open, or shorted replace the
coil.
Loosen hydraulic line at pump to
relieve pressure build up. Re-
adjust limit switch so unit stops at
7 to 8 inches above the ground.
Unit keeps blowing fuses when
the raise button is pressed
Shorted solenoid for motor raise
Remove the wire to the solenoid
coil on the pump motor.
Measure the resistance, it should
be around 19 ohms. If it is nearly
zero ohms replace the solenoid.
