Air compressor vibration - IR T30

[shad9876]

Bought an ingersoll rand t30 (2475 pump) and put a new Leeson 7.5hp single phase motor on it. Also had to put a new check valve in it because guts of the original check valve were gone...not sure where they went (bottom of the tank, maybe?). Motor and pump sound good but the vibration definately seems abnormal. The motor looks like it's bouncing up and down. The pump and tank look steady but anything not bolted down is vibrating. All the motor and pump bolts are tight. The belt tension is good. I also checked all the tank and motor welds and all appear good.

Any ideas? Can the pulleys get out of balance? Bad motor?

 

[C96]

Make sure the flywheel is tight and the rotation is correct.

 

[930dreamer]

You could remove the belt and power up the motor to see if it vibrates.

 

[The mean fish]

Once you confirm that the motor itself (without the belt) isn't causing this I'd look at the flywheel. Pull it and take it to a small town tire shop, have them throw it on the tire balancing machine and see what you have.

 

[G_P]

Old belt? If so the belt will take a set to the shape it has been sitting in. Meaning the part wrapped around the small motor pulley will not straighten back out and when it goes around the flywheel its like it hits a bump. This can cause vibration.

 

[shad9876]

Ran the motor with the belt off and it purrs like a kitten. Belt looks ok but I'm gonna to make a trip to the parts store to get a new one. If it's still vibrating I'm going to pull the pump pulley and take it to a tire shop like mean fish recommended.

Thanks everybody for your insight. I'll post updates.

 

[shad9876]

The old belt looked ok but I went ahead and swapped it for a new one and 90% of the vibration is gone.

 

[PT Doc]

Sweet solution. And cheap.

 

[LX-Markham]

Digging up an old thread as I'm concerned about the amount of vibration on my compressor and would like to have it run smoother. I'm going to try a new belt, but I'm having a difficult time understanding how this could have any affect?

 

[87jeepwrangler]

Digging up an old thread as I'm concerned about the amount of vibration on my compressor and would like to have it run smoother. I'm going to try a new belt, but I'm having a difficult time understanding how this could have any affect?

Old belt? If so the belt will take a set to the shape it has been sitting in. Meaning the part wrapped around the small motor pulley will not straighten back out and when it goes around the flywheel its like it hits a bump. This can cause vibration.

 

[Kellyblues]

Old belt? If so the belt will take a set to the shape it has been sitting in. Meaning the part wrapped around the small motor pulley will not straighten back out and when it goes around the flywheel its like it hits a bump. This can cause vibration.

I work on tons of belt drives ****, this exact thing causes vibration all the time. V or Cog belts either one has the same effect. If you hadn't said it I was going to.

 

[Kellyblues]

Digging up an old thread as I'm concerned about the amount of vibration on my compressor and would like to have it run smoother. I'm going to try a new belt, but I'm having a difficult time understanding how this could have any affect?

I see V belts all the time that look like they have nothing wrong with them. Then a closer look and you spot a slick spot. Sometimes the width of the belt is slightly narrower where the slick spot is. It slips a litle when that slick spot goes around the smallest shieve and most of the times causes a vibration.

Or a slight bulge in any part of the belt. It really doesn't take much.

Worn shieves will do this also. If the V of the belt is digging into the shieve because its worn will cause all kinds of problems.

 

[scw1991]

a lot of it has to do with belt whip if it isn't stretched tight enough.

Reciprocating compressors just as a car engine produce torsional vibration. Thus the use of a harmonic balancer on the engine.