Operator’s Manual
2/2/21
EHLTX, MANUAL.DOCX
Copyright 2021, Vestil Manufacturing Corp.
Page
30
of
32
PROBLEM
POSSIBLE CAUSES
ACTION
Motor hums or pump squeals, but
the platform does not move, or the
platform moves only slowly.
Pump is failing to produce pressure.
Consult factory.
Excess voltage drop to motor, due to power
wire size too small, wire run to long, or
incoming voltage too low.
Check the power installation for adequacy. Check the
incoming voltage
while the motor is running
. Correct
any problems found.
Motor is “single-phasing”.
Determine and correct cause of voltage loss on phase.
Pressure relief opening at full pressure.
Check for structural damage or binding of the scissor
legs, etc.
Check for platform overload condition.
Contamination holding open the lowering
valve or the check valve.
Remove and inspect valves. Clean per instructions in the
“Inspection and Maintenance” section.
Platform raises, then drifts down.
Contamination holding open the lowering
valve or the check valve.
Remove and inspect valves. Clean per instructions in
“Inspection and Maintenance” section.
Spongy or jerky platform movement.
Excessive air in the hydraulic cylinders.
Cycle the platform up and down several times, without
load, to expel air from system.
Fluid level in reservoir is low.
Add fluid. Fluid should be 1” to 1-½” below the reservoir
fill hole with the platform in the fully lowered
position.
Platform won’t lower.
Perimeter toe guard actuated.
Check for a toe guard extrusion or rubber corner that is
stuck. Adjust if necessary.
Perimeter toe guard switch or wire broken.
Inspect visually; check with mutimeter. Repair as needed.
Solenoid coil is bad.
Check with multimeter using the diode-check function.
(Reading for ohms will not provide an accurate test of
the coil). Replace if bad.
Physical blockage of the mechanism.
Inspect for foreign material or objects blocking the
scissors or the rollers.
Solenoid valve, flow control, or suction hose
screen plugged.
Remove and inspect valves. Clean per instructions in
“Inspection and Maintenance” section.
Platform lowers too slowly.
Solenoid valve, flow control, or suction hose
screen plugged.
Remove and inspect valves. Clean per instructions in
“Inspection and Maintenance” section.
Velocity fuse locking (indicated by platform
only slowly creeping down).
Check for air in hydraulic system. Cycle the platform up
and down several times, without load, to expel air
from system.
Flow control valve spool sticking.
Remove and inspect valves. Clean per instructions in
“Inspection and Maintenance” section.
Platform lowers too quickly.
Flow control valve spool sticking.
Remove and inspect valves. Clean per instructions in
“Inspection and Maintenance” section.
