How to perform minor maintenance on your Atlas Copco GVS 16 R vacuum pump

You can also download the instruction manual below - 

Before beginning service on your vacuum pump remember to switch off the power supply to the pump system. Once turned off, leave the pump to cool to a safe temperature. This usually takes around 1 hour.

Check out the step by step process below demonstrated in the video. 

1. First remove the oil pouring plug to release some of the pressure.
2. Make sure you have a tray on-hand with a volume of at least 1.5 liters, to drain the oil.
3. You can now remove the oil drain plug and drain the oil from the pump. If the oil is still lighter in color, it can be re-used. If it is darker in color, it should be replaced. 

1.     To begin, disassemble the oil sight glass.
2.    Unscrew the bolts on the front-side of the vacuum pump to remove the front-end cover of the oil tank. Once unscrewed, the cover can be removed.
3.    Next, unscrew the bolts to remove the side cover of the tank. Once completed, go ahead and remove the cover.
4.   The spring on the side cover can also be removed. Make sure to check the integrity of the spring. If it’s still strong, it can be reused. If not, then it should be discarded and replaced.
5.     Now remove the poppet and lever assembly near the EMF.
6.    The clip-ORV over the diaphragm, along with the washer.
7.     Once this is completed the diaphragm and mist filter can also be removed.  

Stator cleaning is not mandatory, so only proceed if necessary. If not, then you can skip and go directly to the Oil Tank Assembly service instructions. 

1. To begin, unscrew the bolts to remove the motor view port plate. Once complete, remove the motor view port plate.
2.  Next you can unscrew the bolts and disassemble the motor.
3.  When removing the motor, make sure to set it down in the correct orientation (see video: 3:22)
4.  Now you can unscrew the bolts to disassemble the stator from the oil tank and separate the stator from oil tank.
5.  The O-ring can now be removed from the exhaust face groove. 

1. First remove the spider. Check the toughness of the spider by pressing into it with your hand, or by scratching the surface slightly. The spider should be discarded and replaced if when under pressure it begins to turn to powder.
2. Next, remove the inlet filter and unscrew the bolts to disassemble the inlet flange.
3. The inlet flange can now be disassembled along with the O-ring that is on the inlet face groove.
4. Remove the inlet valve piston and the spring. Check the rigidity of the spring. If it is weak, it should be replaced. It not, it can be reused. 

1. Begin by removing the exhaust valve screw and washer.
2. Next, the exhaust vale spring, support disk, exhaust valve spacer and rubber washer can all be removed.
3. Make sure to check the rigidity of the spring. If it is weak, it should be replaced. It not, it can be reused. 

1. Take two wooden blocks with sufficient surface area and rest the stator between the wooden blocks. Make sure that the pump stator is stable. The wooden blocks should fit between the legs of the stator.
2. Now place the oil collection tray (with a minimum volume of 1.5L) below to exhaust port of the stator and insert the funnel into the inlet port.
3. Pour the clean oil into the stator from the inlet port, and at the same time rotate the rotor shaft in an anti-clockwise direction from the motor flange side. When clean oil with a color code of 1 starts coming from the exhaust port, you can stop pouring out the oil.
4. Rotate the rotor shaft to take out the excess oil and avoid oil spilling. If the remaining oil is lighter in color, it can be reused. If not, then it should be replaced.
5. Now move the oil collection tray and remove the wooden blocks. 

1. Insert the rubber washer, exhaust valve spacer, support disk and exhaust valve spring.
2. Next, the spring washer and exhaust screw valve can also be inserted.
3. Now tighten the exhaust valve screw.
4. Locate the inlet valve piston and spring, which can be found on the boss of the pump cylinder.
5. Lubricate the O-ring with vacuum grease.
6. Assemble the inlet flange and O-ring on the inlet face groove so that the ‘VACUUM’ text on it is facing towards the front side. Now tighten the screws to assemble the inlet flange.
7. Next, use compressed air to clean the inlet filter. Once complete, place the inlet filter into the mouth of the inlet flange.
8.  The next step is to locate the spider in between the coupling jaws.
9. Lubricate the O-ring with vacuum grease and insert the O-ring into the exhaust face groove.
10. Assemble the stator to the oil tank and tighten the bolts to assemble the stator.
11. Next, rotate the pump by 90 degrees and rest it on its feet.
12. The motor can now be assembled to the stator. Tighten the screws to secure the motor.
13. Assemble the motor view port plate and tighten the screws to secure. 

The oil tank instructions are mandatory, so please do not skip out on this important step and follow the instructions closely. 

1.  First, be sure to clean the oil tank with a cloth and recommended cleaning liquid.
2. Next, mark a line on the oil mist filter face, and on the oil tank passing through the boss.
3. The filter housing can now be inserted into the oil tank side.
4. Place the diaphragm and washer on the oil tank and lock it into place by inserting the Clip-ORV into the groove.
5. Assemble the lever with the poppet and the spring on the side cover.
6. Now lubricate the O-ring with vacuum grease and assemble it onto the side cover of the oil tank.
7. Tighten the screws to secure the side cover.
8.  Next, lubricate the O-ring with vacuum grease and add it to the front cover of the oil tank.
9. The front cover can now be secured into place by tightening the screws.
10.  Now clean the oil sight glass using compressed air and assemble it onto the pump.
11.  Lubricate the O-ring with vacuum grease and add it back onto the drain plug.
12.  Finally, add the oil drain plug to the front cover. 

1. Pour the oil into the pump until the oil level reaches ‘Max.’ this can be seen on the oil level sight glass.
2. Now you can lubricate the O-ring with vacuum grease and assemble the oil drain plug with the O-ring. 

That’s it! Remember to dispose of old or broken parts responsibly and store your tools in a safe place for the next vacuum pump service.