-37-
１２．
COMMON FAULTS AND SOLUTIONS
Condition
Cause
Measure
The motor does not
operate.
Wear or damage to the motor
brushes.
The power plug is not inserted
correctly, or electricity is not flowing
to the outlet.
Damage to the power plug or switch,
or severing of the cord or connection
to either the power source or the
remote control.
Inspect the contact area of the brush.
Replace the brush if it has become
too short (8 mm or less).
Remove plug from wall socket and
check connections. Check continuity
of supply, repair or replace faulty
leads, plugs and hand controls.
Confirm that electricity is flowing to
the outlet. Ensure the power plug is
properly and fully inserted.
Hydraulic oil is not being
discharged.
Even if oil is discharged
the cylinder does not rise
from midway.
Pump does not maintain
pressure.
The cylinder does not
extend quickly and is
jerky in operation.
The cylinder stays in the
extended position and
does not return.
The level of oil in the reservoir is
insufficient to extend the cylinder.
Couplers not fully connected.
Check that the male and female
coupler halves are tightened fully
and zero gap exists between them.
Air is inside the cylinder.
Oil leakage due to looseness of the
screw in the connector area.
Air has entered the low pressure
pump (trochoid) causing a lack of
suction to prime the pump.
Therefore is not flowing through the
intake in the tank.
Check oil level in reservoir and add
more hydraulic oil if necessary.
Remove air by inverting the cylinder,
fully and extending the plunger
while the cylinder remains inverted.
Retract the plunger. Repeat 2 times.
Tighten female/male couplers by
hand. If pressure exists in the system,
hand tightening will be impossible
so use spanners & a pipe wrench but
first ensure all system valves remain
in the “hold” position.
Retighten the screw.
Turn the electric hydraulic pump on
its side (ensuring the discharge
outlet for oil is facing up). Inch the
pump motor (start & stop in short
bursts) several times to remove air
and so re-create suction in the low
pressure (trochoid) pump.
If
normal operation cannot be resumed
using the measures listed above,
contact your
local sales agent
from where the pump was purchased and request repair.
