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FLUIDX VACUUM PUMP MANUAL - HIGH VACUUM ROTARY VANE PUMPS

4. MAINTENANCE

4.3 Maintenance of oil

4.3.1 Checking the oil-level

During operation of the pump, the oil level must always remain between marks H and L on the oil-
level glass. The amount of oil must be checkedandtoppedup as required

Note

: The pump must be switched oﬀ before topping up the oil. It is recommended to power oﬀ

other components connectedtopump for safety reason.

If gases of liquids dissolved in the oil result in a deterioration of the ultimate pressure, the oil can be

degassed by allowing the pump to run for approx. 30 min. with the intake port closed and the gas

ballast valve open

Replace the oil

2,500 operation hours

Inspect and clean the inlet-filter

Every oil change

Clean or replace the gas-ballast o-ring

Every oil change

Clean the motor fan-cover

Yearly

Clean and overhaul the pump

15,000 operation hours

Fit new blades

30,000 operation hours

Test the motor condition

15,000 operation hours

Oil change Frequency

Application

Frequency (hrs)

High Vacuum in Lab environment, or system seldom exposed to the air

2,500

High Vacuum in manufacturing environment, often exposed to the air

1,200

Vacuum furnace, large gas-exhaust diﬀusion system, system with booster pump

600

Vacuum drier, vacuum molding, vacuum packing

200

Vacuum distillation, low vacuum tank

120

Overhaul

is a process of dismantlement the pump, cleaning all parts and reassembling.

It is highly important to improve the performance and elongate lifetime of the pump.

WSA recommends users to do overhaul at least every other year.

Maintenance Frequency

Operation

Frequency

Check the oil-level

Daily

2 Oil change

For proper operation of the pump, it is essential that the pump has an adequate supply of the
correct and clean oil at all times

Clean vacuum oil is basically odorless and transparent.

(MR-

200 has pale yellow color.)

As operating pumps, the color of vacuum oil turns from yellow through orange into red brown.

This discoloration is caused by gases and foreign materials pumped in and this mixture would

impairs the vacuum level and damage the interior ofpump.

Change vacuum oil when discoloration is dark yellow to red brown. (4 in above picture.)

When the color reach 6~7 with deterioration, the interior of pump would be damaged and

overhaul process is necessary beforeoperatingthe pump again.
If the vacuum oil becomes cloudy as milk color, it is caused by moisture flowedin.

In this case, stop the pump and wait until the fluid is divided into two layers; vacuum oil and water.

Then drain the water layer completely through oil drainplug.

Design the process so as moisture not to be pumped in and install a cold trap if necessary.
Before and after a prolonged storage, additional change of oil is required.
If the speed of deterioration of oil is too fast, apply dust filter or oil filter to the pump.

(refer to sec 7.4 : WMT-250/400)
Contact WSA for further information.

Caution

Only change the oil after the pump has been switched oﬀ and

while the pump is still warm..

Procedure

①

Remove the oil-drain plug and let the used oil drain into a suitable container.

②

When the flow of oil slows down, screw the oil-drain plug back in, briefly switch on the pump

(max. 10 sec) and then switch it oﬀ again. Remove the oil-drain plug once more and drain out the

remaining oil.

③