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7. Maintenance & accessories
7.1 Safety information
The safety information was given in the following applies to all maintenance work.
Warning: Disconnect the electrical power before disassembling the pump and venting to
atmospheric pressure. Make absolutely sure that the pump cannot be accidentally started. If the
pump has been pumping harmful substances, determine the nature of hazard and introduce
suitable safety measure.
When drying or blowing out the pump with compressed air, technician must observe and obey all
safety regulations.
Caution: All maintenance and cleaning work described in this section must be only carried out by
the trained person.
When handling the used oil plus observe the relevant environment regulations.
Improper maintenance or repairs may affect the service life and pump performance.
7.2 Oil change/gear box
Warning: Before pumping oxygen or other highly reactive gases at concentrations which
exceeding 20% in the atmosphere will be necessary to choose a special pump. Such a pump have
to modified and degreased as well as a special lubricant oil. Bearings consume a little oil and the
gear under clean operating conditions. We recommend you to change the oil after the first 500hrs
operation to remove any wearing residue. Then, under the normal operating conditions, change
pump oil after every 3000hrs operating. Change oil much more frequently when pumping
corrosive vapors or large amount of dust or when happing from the atmospheric pressure to
working pressure usually.
Warning: Before removing the oil-drain/oil filling screw, the pump should be stooped at first and
vent to atmosphere pressure (have no vacuum inside pump chamber).
When the pump has become warm during operation, the casing and the oil temperature may
exceed 80 ā, then should leave the pump to cooling down.
Always wear protective gloves to protect yourself against aggressive residues in the oil .
Loosen the oil-drain/oil-fill screw and then drain out the oil. Clean the sealing surface and firmly
reinstall the oil-drain screw using a gasket which is in a perfect condition. Wipe off any oil residues
from the casing. Fill in new oil. Make sure to use the right kind of oil.
Caution: We recommend the vacuum oil is N100 or N62. Make sure the oil level is correct .If the
oil level is too low, the bearings and gearwheels will not lubricated adequately; if it is too high, oil
may enter into the pump chamber. Clean the oil-fill port and reinstall the screw using a gasket
which is in a perfect condition.