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PRECISION MACHINE TOOLS Ver 2 Maintenance Manual
The oil filter shall be installed at the return oil ( inlet ) of the cooler to filter impurity efficiently and
protect the spindle.
Oil cooler uses hydraulic oil and lubrication oil. The directed oil for WEXTEN cooler is 2-300 CST.
The oil below are prohibited.
(1 ) Hydraulic oil of phosphoric ester and chlorinated hydrocarbon types, water, water/ glycol
hydraulic oil
( 2 ) Cutting oil, grinding oil and water-soluble liquid.
( 3 ) Medicine and corrosion liquid.
( 4 ) Gasoline , kerosene and EDM oil.
Check points before operation
1. When the power source is turned on, check to see if power lamp is lighted up.( see figure 1 )
2. Check that electrical resistance of compressor and pump is above 500 ohms.
3. Check that the oil level is at least at 80% level of the oil tank ( see figure 2 )
4. Check that the outlet of the oil tank is tightly secured.
5. Check that the overload switch is at “on “position.
6. Check that value is set at 5 kg/cm² for the pump pressure ( 5kg/cm² indicates 12 L/min, 20L/min,
30l/min pump adjust pressure; .5 kg / cm² indicates 4.5L/min, 7.5L/min, pump adjust pressure )
7. Check the high pressure switch of cooler of capacity 3000 kcal/hr is adjusted at 23 kg/cm² and
28 kg/ cm² for cooler of capacity above 6000 kcal/hr. ( see figure 3 )
8. Check if the oil inlet is fitted with an oil filter. ( see figure 4 )
9. Check cooling medium high/low pressure, if the indication needle position is as same as the
testing report
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