17
ADJUSTMENTS AND CONTROLS
:
ADJUST PAN SPEED
There are three controls available on this power unit. The first is an adjustable relief
valve mounted into the custom aluminum manifold block. The other two control the
linear speed of the actuator.
RELIEF VALVE:
The relief valve is located underneath an aluminum hexagon cover on the side of the
custom manifold block. This relief valve is factory set to 825 P.S.I. and locked and
should not be adjusted.
If adjustments are necessary, remove the hexagon cover which will give access to the
relief valve screw. With the pump running, and with a suitable flat blade style
screwdriver, rotate the screw clockwise to increase pressure, and counter-clockwise to
decrease pressure. While this operation is being carried out some oil will leak down the
threads of the adjusting screw.
To obtain the pressure required, a pressure gauge will have to be located in the circuit.
The best location is on the cylinder hose. To set the pressure, energize the solenoid to
extend the cylinder fully and thus “deadhead” the system. The pressure can be set as
indicated above. When adjustment is complete, replace the hexagon cover. This will
seal the relief valve area. The actual factory set pressure is noted on the label and
should not be exceeded as this affects the HP draw on the electric motor.
FLOW CONTROL:
There are two flow control valves mounted on the power unit and located on the solenoid
valve subplate. The flow control valves will restrict the capacity of oil passing through
them when the knurled knob is screwed in - in a clockwise direction. This action will
reduce the linear speed of the cylinder. Turning the flow control valve adjustment in the
opposite direction – counter-clockwise, will increase the speed of the cylinder. One flow
control valve (right side) will allow adjustment of the extension speed (travel speed
should be set at minimum 20 seconds), the other (left side) the retraction speed.
(Retraction speed should be set at minimum 10 seconds).
IMPORTANT:
It should be noted that if the cylinder speed is restricted by the flow control valves, the
balance of oil not delivered to the cylinder will go over the relief @ 825 P.S.I. which will
cause unwanted heat in the reservoir.
