6-4 CHAPTER 6: HYDRAULICS
ALPHA ST320 S2
2.3. Pressure switch SQ0
To ensure the hydraulic system performance, the pressure is continuously monitored by a pressure
switch set at the factory at 0.5 bar. Whenever the hydraulic pressure is lower than this value, an alarm
e28 arises and the bar feed system running interrupts simultaneously with the next chuck open.
2.4. Oil filling and draining
The bar feed system is delivered without oil. 25 litres (7
gallons) of hydraulic oil of any type indicated below must be
provided by the client. The oil should be filled into bar
feeder before running. Pour the oil into the oil tank directly
as shown. The oil height should be kept around H mark on
the level when the hydraulic pump is not running.
Viscosity Index (cSt @ 40°C / 104°F)
ISO VG 100 90.0 ~ 110
Consult your supplier for adequate oil according to the
table above.
3. MAINTENANCE
The hydraulic oil quality gets worse with the bar feeder system running continuously. The cutting chips
and sludge heap on button of the oil tank and will be pumped into the hydraulic system. These
substances will damage the pump, the guiding channel or even bar stock. Therefore, depends on the bar
feed system running status, it is recommend to drain and clean the oil tank at least once every 6 months.
Follow the procedures below:
• Power OFF the bar feeder system. Confirm most of the oil return to oil tank.
• Remove the remnant tray.
• Place a container with sufficient capacity (minimum: 30 litres) underneath the drain plug.
• Remove the drain plug and drain the oil.
• When the oil tank is empty, clean the sludge inside the tank and bar feed system.
• Clean the drain plug. Apply seal on the plug and screw the drain plug in.
• Refill new oil into the bar feed system until the indicator shows oil level at H (about 25 litres
needed). Confirm there is no leaking from the plug.
• Install the remnant tray back.
Dispose of waste used oil properly in an environmentally friendly way, and according to
your local regulation.
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