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The following information is a guideline for maintenance and fixes of various brands and sizes of rotary vane. These are tips you can refer.
Suggestions 1 =>Replacing vanes : You should replaced the vane of pump when the vane is ¼” shorter than new , the best way to tell what the new size should be if a new vane is not available, is to measure the slot where the vane belongs as the slot is normally the length of a new vane.
Suggestions 2 => Oil drip rates(DPM=drips per minute)
The following are tips for vacuum pumps with adjustable drippers
3 to 5 HP = 6 to 8 DPM, per dripper, if 7 ½ to 10 HP= 10 to 15 DPM, per dripper
When an oil reclaimer is in place these drip rates could be as much as 5 to 10 DPM more.
Suggestions 3 => Check bearings and Seals: You should replace the bearings if any play is detected, and check the bearing surface on the rotor shaft as well as in the endplate . It's common to find the new bearing doesn't get tight on the shaft, and in some cases as well in the endplate. To repair this,the shaft must be welded and machined, as well as the endplate should have a new sleeve installed. Seals are among the first reasons to cause a pump to fail. If a seals wears and no longer makes a tight seal on the shaft, it will allow vacuum to be pulled in, thus causing the oil dripper to pull air upward instead of drawing oil down to the bearings. In most cases, if this problem is neglected, the pumps will lock up.
Suggestions 4 => The good & bad about oil reclaimers : When an oil reclaiming system is neglected it would be better to just have a standard dripper system. All the steam and vapor carry over from the wash & rinse cycle typically gets trapped in the reclaimer. This is why it is important to change the oil and filter regularly. During winter months it's very important to drain the water off the bottom. If this isn't done it could freeze, which would prevent any oil from getting to the pumps.
Suggestions 5 => Belts: Belt tensioning is a very important part of a vacuum pump system. Belts that are too tight can take a shaft out in a short time. In many instances the damage will be to the shaft, not the bearing. This is due to the bearings are made of a harder material than the shaft. On a typical installation, the belts should give about 1” pushing from the top down without too much pressure.
suggestion 6 => Pump rebuilding : When a pump housing is rippled or scared on the inside surface, it should be honed out.To do a complete rebuild the tolerance must then be reset between the housing and the rotor. If this is not done the CFM flow is typically less and the pump will get hot as it is not displacing the air as it should.
Suggestions 1 =>Replacing vanes : You should replaced the vane of pump when the vane is ¼” shorter than new , the best way to tell what the new size should be if a new vane is not available, is to measure the slot where the vane belongs as the slot is normally the length of a new vane.
Suggestions 2 => Oil drip rates(DPM=drips per minute)
The following are tips for vacuum pumps with adjustable drippers
3 to 5 HP = 6 to 8 DPM, per dripper, if 7 ½ to 10 HP= 10 to 15 DPM, per dripper
When an oil reclaimer is in place these drip rates could be as much as 5 to 10 DPM more.
Suggestions 3 => Check bearings and Seals: You should replace the bearings if any play is detected, and check the bearing surface on the rotor shaft as well as in the endplate . It's common to find the new bearing doesn't get tight on the shaft, and in some cases as well in the endplate. To repair this,the shaft must be welded and machined, as well as the endplate should have a new sleeve installed. Seals are among the first reasons to cause a pump to fail. If a seals wears and no longer makes a tight seal on the shaft, it will allow vacuum to be pulled in, thus causing the oil dripper to pull air upward instead of drawing oil down to the bearings. In most cases, if this problem is neglected, the pumps will lock up.
Suggestions 4 => The good & bad about oil reclaimers : When an oil reclaiming system is neglected it would be better to just have a standard dripper system. All the steam and vapor carry over from the wash & rinse cycle typically gets trapped in the reclaimer. This is why it is important to change the oil and filter regularly. During winter months it's very important to drain the water off the bottom. If this isn't done it could freeze, which would prevent any oil from getting to the pumps.
Suggestions 5 => Belts: Belt tensioning is a very important part of a vacuum pump system. Belts that are too tight can take a shaft out in a short time. In many instances the damage will be to the shaft, not the bearing. This is due to the bearings are made of a harder material than the shaft. On a typical installation, the belts should give about 1” pushing from the top down without too much pressure.
suggestion 6 => Pump rebuilding : When a pump housing is rippled or scared on the inside surface, it should be honed out.To do a complete rebuild the tolerance must then be reset between the housing and the rotor. If this is not done the CFM flow is typically less and the pump will get hot as it is not displacing the air as it should.
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